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Global Positioning System - Science topic

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I am currently working on GNSS Spoofing as my master's thesis and working on GPS signal generation using MATLAB.
I wanted to know whether it is possible to use MATLAB for generating a complete signal of 5 satellites or not?
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Thank you so much for your kind responses. I have completed my Masters thesis and got an A grade on my thesis too. :)
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I’m looking for research testing the accuracy of GPS at various buried depths. I’m wondering if GPS, RTK and LoRa could be used to mark the location of underground utilities.
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@ Thomas, so far I know, 2m is the ideal depth.
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I am doing a forestry research. I need to record the geographical coordinates and altitude values of my experimental plot. Getting a GPS receiver is difficult for me and purchasing a GPS receiver is very expensive. I am thinking of using my smart phone (ios) instead of a GPS receiver. I do not know a very good, technically reliable ios application to get the works done. Please suggest me one ?
Also I need to know whether using a smart phone GPS application is a valid scientific method/scientifically acceptable in scientific researches ?
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Dear Dr. Pete, I have tested forestry before, and found that due to the IOS system can't install open-source positioning applications, it can't achieve high spatial positioning; On the contrary, Android phones can install many open-source positioning software, which can achieve better positioning requirements.
Of course, non professional measurement tools must have a better measurement environment and satellite reception to achieve more satisfactory results.
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Hello everyone,
I am working on cell dosimetry by simulating cell irradiation in biological wells. In the wells, a volume of water in which the cells are constructed independently. Concerning the irradiation source, I want it to just fill the water volume but not the cells, and inversely. By researching, I found the (confine) method using GPS. However I could not apply it appropriately. Can have any help on how to apply it, or any already constructed example that implement this method ? Or even if there are any different methods ?
Thanks in advance for any help.
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Other method for define source or beam, is "gun" method. This method used in Geant4-DNA examples. For using this method you can see "microdosimetery" example in Geant4-DNA.
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Planning to use a handy and affordable GPS receiver along with ArcGIS Field Maps for data collection.
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Thank you, Dr. Fareed. I checked their website and found Trimble Catalyst/DA2 with GNSS and Bluetooth option.
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I have widely inaccurate spatial distances in my "Pairwise Spatial and genetic distances written in column form" table output from SPAGeDI 1.5. For example SPAGeDi measures the distance between points -29.325094, 29.707921 and -29.322181, 29.707929 as 0.001178km (Spatial dist (km) column), but they are actually +/- 320m apart! I have entered the lat and long as decimal degrees (Lat = -29.322710, Long = 29.716432) in columns labeled X and Y. I have also specified Num Coords in the second line of my file as "-2". Are the spatial distances something else entirely and not the distance between GPS points?
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I found my answer. My column order was animal ID, Lat, Long, Pop, allele 1, allele 2, ... So I moved the Pop column to after the animal ID and now it's correct with only minor differences.
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I set up a number of control experiments indoors, placing soil samples in a number of boxes with openings above them according to different treatments. I would like to use this multispectral sensor to take pictures of these soil samples indoors, but it seems that it must be used in conjunction with a GPS tool? Is it possible to use it without GPS? It is like a digital camera that can take pictures manually.
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I think you can use it. If it has been installed on a UAV, I suggest you use the UAV to take pictures and avoid damage during the uninstallation. But one trouble you may face, the camera focus distance is set for UAV flying, so when you try to take a picture at a short distance, the image may not be clear enough. Also, the distance between different camera sensors will make the picture shift. I only test the P4M (DJI), it's hard to fix these problems.
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Hello,
I'm currently working on movement ecology data.
I have plenty of Northern Gannets GPS data, and I discovered Theo Michelot work on moveHMM. I would like to use this package on my dataset, but unfortunately I don't really see how to adapt it for my data, and I'm having a few issues while trying.
So if you have some moveHMM experience, or you are also interested in using this package, I would love to exchange with you.
Thank you,
Ryan.
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Hello, I have used moveHMM a few years back but I eventually settled for the m2b package that uses Random forest and not HMM. It's quite easy to use. https://cran.rstudio.com/web/packages/m2b/m2b.pdf
Nathan.
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Self-reporting bias is a challenge in case of GPS data collection, in studies where participants have to manually START and STOP recording their trip, unlike studies where GPS data is passively collected (continuously in the background) without the need for user intervention.
I specifically want studies which have mentioned the existence of self-reported bias in the context of GPS data collection.
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I'm still trying to understand your question. In the passive collection, you are referring to a GPS device that is at a fixed location so the deviations in reporting can be seen?
And you are looking for what?
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I want to log GPS/GNSS data on an iPhone/iPad and look for a dedicated app. I want to log as much data as possible (DOPS, satellite data [strength, number, position,...], used constellations, frequencies...) over a longer period of time. Additional data from other internal sensors (IMU) would also be ideal. The recording should not depend on the position change, ideally in NMEA or RAW and stored locally. Other data formats are also possible if they contain the necessary information.
Does anyone know such an app for IOS? I have tried dozens and have not found one that meets the requirements.
Thanks
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Thank you for your answer. The programme works smoothly, even in the combination of GNSS and other sensors. It is also available for iOS and Android. It still has one weakness. GPS/GNSS/Location alone provides the number of satellites, in combination with other sensors this number of satellites is missing. Nevertheless, I will use this app.
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The raw GPS data is useful for various post-processing tasks. What is good source of obtaining raw GPS data in RINEX format?
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I am trying to calculate KDE home ranges for 50 polar bears for a research project. The bears were collared with Argos GPS collars, and each bear has around 200 locations (one location/day).
I am hesitating between using the Least-squares cross validation method (LSCV) or plugin to estimate the h smoothing factor; given my dataset, which of the two would be the best method?
Any advice would be appreciated!
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Cross-validation is a good method but it can take too long if you have 10000 or so. With 50 or 200 there is no problem With it.
You can try also adaptative methods for bandwidth with different sizes for each point.
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What is the position error limit for GPS aided INS sensor fusion for small rockets?
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The issue of grazing is a huge concern for the managers of all the conservation reserves (protected areas: national parks, wildlife sanctuaries). I would like to request my colleagues to provide some efficient ways to map high alpine grazing lands.
Thanks and sincere regards
Gowhar Meraj
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Are there any available datasets of autonomous vehicles trajectories with GPS and date times specifications? if not, how would one adapt existing datasets, which are obtained from normal vehicles, to autonomous ones if possible?
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Here are same datesets for vehicle trajectory prediction/planning:
Argoverse
Appoloscape
NGSIM
HighD
nuScenes
CommonRoad
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Hello guys,
I'm currently doing a research on the working of Track and Trace, since it's a thing that is often used... My school has given us the assignment to look in the working of track and trace. But even though I'm looking a lot on the internet. I can't find a clear description on how it works.
Yeah it works (often) with a GPS signal. But what type of communication is this? Is it encrypted communication or is it unencrypted communication? If it is encrypted what kinda encryption is most likely used?
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Greeting Eric Adema . Firstly, you need to know what that you want to track and trace. For example, if you want to track the target, you need to have two prominent parameters; location of the target and the current location of the vehicle. So, in this situation, the both parameters will undergo several computation in order to get the distance and the heading towards the target. Then, when we talk about the 'trace' the target, the first thing you need to consider is about the movement of the vehicle which is compulsory to identify the velocity, current heading and also the DOF of the vehicle. So, it will have various of computation in order to move exactly towards the target position. GPS is very compatible in order to has the location (Latitude, Longitude) but you need to used the high resolution of GPS.
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1) Can the existence of an aether be compatible with local Lorentz invariance?
2) Can classical rigid bodies in translation be studied in this framework?
By changing the synchronization condition of the clocks of inertial frames, the answer to 1) and 2) seems to be affirmative. This synchronization clearly violates global Lorentz symmetry but it preserves Lorenzt symmetry in the vecinity of each point of the flat spacetime.
Christian Corda showed in 2019 that this effect of clock synchronization is a necessary condition to explain the Mössbauer rotor experiment (Honorable Mention at the Gravity Research Foundation 2018).
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We may consider the time of a clock placed at an arbitrary coordinate x to be t and the time of a clock placed at an arbitrary coordinate xP to be tP. Let the offset (t – tP) between the two clocks be:
1) (t – tP) = v (x - xP)/c2
where (t-tP) is the so-called Sagnac correction. If we call g to the Lorentz factor for v and we insert 1) into the time-like component of the Lorentz transformation T = g (t - vx/c2) we get:
2) T = g (tP - vxP/c2)
On the other hand, if we assume that the origins coincide x = X = 0 at time tP = 0 we may write down the space-like component of the Lorentz transformation as:
3) X = g(x - vtP)
Assuming that both clocks are placed at the same point x = xP , inserting x =xP , X = XP , T = TP into 2)3) yields:
4) XP = g (xP - vtP)
5) TP = g (tP - vxP/c2)
which is the local Lorentz transformation for an event happening at point P. On the other hand , if the distance between x and xP is different from 0 and xP is placed at the origin of coordinates, we may insert xP = 0 into 2)3) to get:
6) X = g (x - vtP)
7) T = g tP
which is a change of coordinates that it:
- Is compatible with GPS simultaneity.
- Is compatible with the Sagnac effect. This effect can be explained in a very straightfordward manner without the need of using GR or the Langevin coordinates.
- Is compatible with the existence of relativistic extended rigid bodies in translation using the classical definition of rigidity instead of the Born´s definition.
- Can be applied to solve the 2 problems of the preprint below.
- Is compatible with all experimenat corroborations of SR: aberration of light, Ives -Stilwell experiment, Hafele-Keating experiment, ...
Thus, we may conclude that, considering the synchronization condition 1):
a) We get Lorentz invariance at each point of flat space-time (eqs. 4-5) when we use a unique single clock.
b) The Lorentz invariance is broken out when we use two clocks to measure time intervals for long displacements (eqs. 6-7).
c) We need to consider the frame with respect to which we must define the velocity v of the synchronization condition (eq 1). This frame has v = 0 and it plays the role of an absolute preferred frame.
a)b)c) suggest that the Thomas precession is a local effect that cannot manifest for long displacements.
More information in:
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Cameron Rebigsol I understand your world view and Sir Isaac Newton would have agreed with you. Newton explained gravity and made the connection between the gravity on Earth (e.g. the falling apple) and the motion of the moon. He worked out that it would all be explained by an inverse square law of distance. Even Newton was a bit puzzled about how this "action at a distance" worked.
James Clerk Maxwell pointed out that this "action at a distance" was not a good explanation and felt that there had to be some mechanism through the medium to produce electromagnetism and gravity.
I agree with the viewpoint of Maxwell and I do take as my starting assumption that General Relativity is completely correct as there is sufficient evidence for this. Then the question of "action at a distance" is resolved because it is the state of the medium (i.e. spacetime) which is the underlying cause of the gravitational and electromagnetic forces.
Richard
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I am currently working on a study to estimate the traffic volume distribution of urban areas by utilizing mobile phone location records. Please, can anyone help me to find an open access dataset for the desired task? Your contribution in this regard is highly appreciated!
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Hi,
You can check that...
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I mean besides the official interface control documents provided for GPS, Galileo, GLONASS, and BeiDou, is there a relatively recent document that lists the services broadcasted and the main signal characteristics (e.g. carrier, modulation, chiprate) at least for these global systems?
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Thank you very much
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The L5 signals from GNSS (US GPS/NaVIC/GLONASS) are being explored for wide applications. With focus on assessing the errors in (GPS) location data, what are the fundamental steps involved in determining errors or corrections that are necessary. Key points on validation mechanism.
I am exploring this topic and it will great if specific literature on fundamentals corrections adopted on processing of L5 signals can be highlighted.
Thanks in advance.
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You can read this paper:
Testing GPS L5 Tracking Algorithms and their Impact on Positioning Accuracy
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We're currently planning a pilot study to explore movement behaviour within urban and sub-urban greenspace, as well as the contribution of greenspace-based physical activity to total weekly physical activity. Participants will be given accelerometers to capture movement, but we're looking for a good (but affordable) method of capturing location. Dedicated GPS devices remain prohibitively expensive for this project, with a potential solution available through using smartphone data collection.
I'd be really interested and grateful to receive recommendations for smartphone apps that would facilitate this capture. Naturally, I'm interested in accuracy, but would be willing to compromise somewhat in order to obtain an app that is cross-platform, simple to use and share data, and possesses precedence for research use. The app also needs to be ethically sound with regard to data sharing and privacy. The choice in available apps is overwhelming, and any recommendations would be most welcome, especially those based on experience.
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Also check..Where You at? Using GPS Locations in an Electronic Time Use ...
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For GPS - INS fusion how to find the rotation matrix from body to navigation frame and how the coriolisis and gravity will effect the navigation purturbation equations?
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Dear Varsha:
As Nabil answered, Farrell's Aided Navigation is a good book. Other good books are:
Biezad, D. J., Integrated Navigation and Guidance Systems, AIAA Education Series, 1999
Rogers, R. M., Applied Math in Integrated Navigation Systems, 3rd ed, AIAA Education Series, 2007
Grewal. Weill and Andrews, GPS, Inertial Navigation, and Integration, 3rd ed,
John Wiley 2013
Farrell, James L., GNSS Aided Navigation and Tracking, American Literary Press 2007
Farrell and Barth, The GPS and Inertial Navigation, 1999
For further correspondence with me, you may write to me at IIT Indore,
Also, you may see Sreeja, Professor, in your college, in Electrical Engineering.
I hope all this helps.
Hari Hablani
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If a GPS tracking device is placed on animal, I assume it will more or less affect the movement of the individual. So, is there a way the animal can get rid of the device by itself or everytime you place a device you will need to remove it for the animal later.
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I am not a specialist, I just have a general interest in your interesting question. Here is a page about the ethics of animal tracking with short considerations about removal of the device after the end of the study: https://www.animalethics.org.au/policies-and-guidelines/wildlife-research/radio-tracking
See also this summary of a study: https://www.ucd.ie/newsandopinion/news/2020/july/30/solar-poweredanimaltrackertransformshowresearcherscollectdataonanimalsinwild/ ("Attaching, and later removing, a tracking device to an animal involves capturing, restraining, and in some instances sedation. This process can be stressful for animals. Significantly lessening the impact that such tagging has on the behaviour, health, or welfare of an animal is a paramount concern for researchers.")
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Hello everyone. I am a PhD student at the Czech University of Life Sciences, I am working on the development of data collection collars (tags) for different animals species (and, what is more critical - sizes). At this point, I am looking for colleagues, coauthors and collaborators who are working in the field of animal behaviour and automatic data collection (i.e. accelerometers, gyroscopes, GPS). To continue the development and appliance of animal behaviour data collection devices and analysing tools for that purpose. If you are interested in more details, you can contact me here or by email: fiialkovskyi@ftz.czu.cz
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Dear Pavlo,
Thanks for your prompt reply, so let us start up our joint work on animal behaviors. I am looking forward to hearing from you on this affair very soon.
Thanks in advance,
Takeo
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Given millions of GPS points located in the same area. What would be the least cost method to extract all the neighboring points of each entry in the dataset ( i.e. all the points that are within a given range of another one) ?
It is to be noted that this process will only be done once for the entire dataset.
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I have successfully used kd_tree (https://en.wikipedia.org/wiki/K-d_tree) to create a data structure capable of handling milions of 3D points. There are also some libraries that can help you implement it such as https://docs.scipy.org/doc/scipy/reference/generated/scipy.spatial.KDTree.html
Good luck!
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I work for FL Fish and Wildlife Commission and have 50+ old Wild turkey non-rechargeable VHF and GPS transmitters that no longer work. Does one know what options I have for disposing or recycling them?
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We are going through the same issue. We have decades worth of old, unrefurbishable VHF collars. I contacted the companies and generally, they are Lithium Chloride batteries. We discharge them fully and send them to our HAZMAT contractor for incineration because the batteries are encased in resin and are not easy to remove.
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How can we determine the tangent point (lattiude, longitude, and altitude) from position of LEO and GPS satellites?
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You can find an explanation on how to calculate it in the following link:
that corresponds to the Ph.D. dissertation Contributions to ionospheric electron density retrieval.
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Dear all,
we are preparing a multibeam survey on the Canary Islands and ask ourselves which GPS RTK service would allow for smooth operation near the south coast of Lanzarote. Fugro marine star is not accurate enough, we need a "real" RTK service providing positions in the centimeter accuracy level. Most preferentially we would like to catch the signals via mobile internet near the coastline via NTRIP. We would highly appreciate recommendations or shared experience for canary island surveying ;)
best regards Jens
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Dear all, the issue has been solved. We use online RTK via Ntrip from a local GPS reference stations nearby. The corresponding service is hosted by http://www.grafcan.es/ and a yearly subscription cost 200€ for our academic surveying. The GPS accuracies we obtained ranged between 3 and 5 centimeters and highly improved our MBES measurents
Many thanks and
best regards
Jens
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Does anyone know how can we represent the GPS data acquired over three years from radio-collared deer? Any GIS Software for mapping out home range and seasonal movement without going for excel calculations?
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The best solution is to use R rather than a GIS software for analyzing home range and seasonal movement. GIS is a good tool for keeping and viewing your data. R is designed for analysis. A review paper for animal movement using R can be a start paper. https://besjournals.onlinelibrary.wiley.com/doi/10.1111/1365-2656.13116.
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Plate tectonics is a theory that states that plates on the Earth's surface move as rigid bodies. GPS is a system that is working independently on the theoretical motions of these theoretical plates, which means that the motions of plates must be visible when studied by passive GPS receivers (if you don't think so, tell us). Some studies work with the so called plate-fixed (net rotation) reference frames, such as e.g. NAD83, that use GPS data, but state that the frame is plate-fixed - no plate motion is visible. My question is: Is it possible that one creates a plate-fixed frame for GPS? If you think so, please, describe the process. I repeat that GPS does not care about the reason why the passive receiver changed its position - so how can you fix your data to a theoretical motion of a plate?
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I concur with Jan
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During field mapping, geographic coordinates are collected using GPS, and later on these coordinates are plotted on the digital geographic map. Then, I would like to have different steps to download the GPS coordinates and plot them on a digital map. thank you
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It would be nice to know whether you desire plotting GPS latitude and longitude as latitude and longitude or in a different format eg. UTM or local coordinates where you are and what package you intend using. Reason being GPS coordinates are spherical coordinates and you are trying to depict them on a flat or planar surface and you cannot directly do that.
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Since I am working on autonomous vehicle, I am interested in developing a path planning/navigation system for guiding in row crops. Please tell me about the type of algorithm/programme that needs to be developed for same. Also, inform me what type of camera and GPS system (Make; Model) for real time application will be the best that can identify the crop rows.
Is there any firm in India which can provide the necessary equipment/components.
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You are welcome. As I had already underlined, I have no knowledge about such cameras. I have never seen such cameras in my hand or any other place. I have not also seen any technical online video in detail about them . I know no detail about the cameras. I only suggested my idea through the theoretical scope. I discriminated between 3D cameras and 2D cameras. I had seen a video from Boston Dynamics Atlas robot and also in TV, in which some cameras render the environment image in 3D scan and can analyze the environment for collision avoidance. A 3D scanner camera is suitable for advanced motion planning. But I guess some simpler cameras you could possibly use for your case. I mean a camera which can distinguish between the rough terrain where the farms are bordered, and the traction where the crops are grown. This could be simply available by a camera which could detect two different colors: color of row crop, and the curb obstacles along borders of any farm. There might be no need for an advanced 3D scanner camera, so long as a simple camera can distinguish dark and light fields and tractions over the farming land based on their color (grey and black). This is all I knew.
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C language
GPS module is neo-blux m6
TivaC123G
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Hello, it's very simple and sources exists of examples.
the difficulties is :
1) wich µC are you using ? UART data buffering is very importante to prevent data lost during serial data transfer
2) wich data do you want ? there are several forms of data depending of GPS sentences frames you are using
I can give you example and at your charge to undestand it and implementing it.
I implementer on mbed LPC1768.
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Hello,
I am looking for an accurate way to measure the surface of agricultural plots with very irregular shapes and less than 1ha.
A potential method is doing polygonations with a GPS or an app on the phone, but it looks like they make 25% error or more when the plots are tiny (100-300 m2).
Do you know of any good alternative I could try?
Thank you very much!
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The first question must be why error of the prediction is higher and how could you reduce that error than finding another method. It is a model and model could be improved by improving the parameters you used to predict! The second question why you are interested to such a lower area or a high resolution. I think sometimes it is better to depend with some levels of error on your model. I recommend you to check your model again and again with ground truth. Otherwise it would be garbage in garbage out. Any model will give you an output based on the the input data. Therefore, knowledge of expertise is highly demanded before you run the model. I want to share you what heard from a man of non-soil scientist in a big conference he said " the soil of area A will be finished within 25 years" based on the model.
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I am interested in products of less than 1 g in weight, for bats of about 10 grams. Thank you for your recomendations in advance.
(Im aware that telemetric transimtors of such weight exist, yet am currently looking into other options)
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I need to collect driving data such as speed, battery SOC, GPS location, ambient temperature, elevation for a specific EV ( say Renault Zoe), but I'm not sure what is the best way to do this and what I would need.
Many studies have used OBD-2 loggers. There are other cloud-based technologies like Geotab or Airbiquity. Also, I wonder if there are any mobile apps that can fulfil these requirements.
Thank you.
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Speed,Gids,SOC,AHr,Pack Volts,Pack Amps,Max CP mV,Min CP mV,Avg CP mV,CP mV Diff,Judgment Value,Pack T1 F,Pack T1 C,Pack T2 F,Pack T2 C,Pack T3 F,Pack T3 C,Pack T4 F,Pack T4 C,CP1 through CP96,12v Bat Amps,VIN,Hx,12v Bat Volts,Odo(km),QC,L1/L2,TP-FL,TP-FR,TP-RR,TP-RL,Ambient,SOH,RegenWh,BLevel,epoch time,Motor Pwr(100w),Aux Pwr(100w),A/C Pwr(250w),A/C Comp(0.1MPa),Est Pwr A/C(50w),Est Pwr Htr(250w),Plug State,Charge Mode,OBC Out Pwr,Gear,HVolt1,HVolt2,GPS Status,Power SW,BMS,OBC
Instead of use LeafSpy you can try With CanZE (for Android phones).
Other option could be instrument the vehicle adding extra (external) sensors.
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We are designing a system that is named as "GPS based traffic monitoring system", that will be helpful in reducing accidents, data collection, traffic congestion avoidance and a lot more. could you please assist me in doing so?
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Dear Mr. Azeem!
I use a case-study approach while searching for resources to answer your question. COVID-19 is a vital factor in this case:
1) Nisar, S., Zuhaib, M.A., Ulasyar, A. et al. A robust tracking system for COVID-19 like pandemic using advanced hybrid technologies. Computing (2021). https://doi.org/10.1007/s00607-021-00946-6 Free access:
2) D’Angelo, G., Palmieri, F. Enhancing COVID-19 tracking apps with human activity recognition using a deep convolutional neural network and HAR-images. Neural Comput & Applic (2021). https://doi.org/10.1007/s00521-021-05913-y Open access:
3) Sowmiya, B., Abhijith, V., Sudersan, S. et al. A Survey on Security and Privacy Issues in Contact Tracing Application of Covid-19. SN COMPUT. SCI. 2, 136 (2021). https://doi.org/10.1007/s42979-021-00520-z Free access:
Yours sincerely, Bulcsu Szekely
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Greetings everyone,
Hope all of you are good in this pandemic situation.
I need some good reference papers and if possible some good ideas which can be useful in the designing of a compact Triple Band GPS/IRNSS patch antenna.
Thanks in Advance.
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Dear
Hadi Nobari
Nobari thanks for giving your valuable time, but the paper you have suggested is not talking anything about circular polarization. The shape they have used is Circular.
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Hello, I was wondering whether there is a non-invasive technique to apply a GPS collar to a wild dog. I was thinking about e.g. a tree hole with some food where they have to put the head through the (elastic) collar to get in, which then automatically attaches to the dog? Or maybe remote controlled (with the help of a camera trap) - like a reversed drop-off mechanism? Or anything else... Thanks!
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Dear Andreas, I'm also interested in this subject, as you suggest I was thinking of placing a collar on specific species path/food trap and use a "necklace trap system". Indeed, the animal will pull his head into the "collar snare" which will adjust the collar to the size of the animal's neck (with a safety catch to avoid any strangeness). Once the pressure is too strong on the cable/elastic used, the trap will break and the animal will be released with the collar. A safety system on the collar itself will have to be put in place to avoid a too important strangulation (elastic?). Or a system that wears out over time, allowing the collar to fall off after a while. The trap could be monitored by GSM camera trap to verify the proper conduct of the operation, in case of problem a rescue operation could be deployed quickly as the camera trap will have sent the images.
For other burrowing species, I thought of a tube at the exit of their burrow that would force them to borrow the latter. In the tube, a mechanism would allow a plate previously coated with special glue to stick to the back of the animal.
Of course the security of the animals must be the priority and these are only ideas to be developed and tested.
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I'm working on a project which will involve using a mono-camera or stereo-camera and accelerometer to detect the location of an object(as offline GPS). I want to implement the data form camera and sensor in an embedded system with algorithm to get the location. I know, there are many embedded system like beaglebone, raspberry pi and stm32.
so my question :
What is the best way to start selecting a suitable embedded system for this project?
Hopefully, somebody can guid me in the right direction.
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Oliver Krohn
Sorry for the late response. Thanks for your help
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Hello Experts,
I want to know that how to find theta maximum when i am using GPS and sphere and surface type distribution. and using cosine distribution.
then i want to know that is there any mathematical calculation to find theta maximum for biasing.
like in the Geant4/examples/advanced/radio-protection theta maximum is 0.003 deg. how they got this using the surface area of source or object. like how can i get for my object ?
any type of help will be appreciated.
Thanks in advance !
Best Regards
Priyanshu
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My research is related to the Ionospheric disturbances for an earthquake, and the point of my question is after I calculated and plotted the Ionospheric Pierce Point (IPP) & Sub-Ionospheric Point (SIP) trajectories, and the values of STEC and their anomalies from the closest satellite to the epicenter of an earthquake area by using several observation stations from sugar, I stopped on the step of calculating or plotting the STEC & VTEC for all my GPS stations because I don't know even I don't have the Matlab script for it. (please provide me a full Matlab script for it) with thanks
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Hello
I want to find accurate locations of some static objects to be used as landmarks for localizing other mobile object. As the landmarks will be used to localize other object, their own location must be accurate. Kindly suggest some practical methods for accurate positioning of static objects(landmark).
Best regards
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@tariq islam .Use dead reckoning.it is the process of calculating current position of some moving object by using a previously determined position, or fix, and then incorporating estimations of speed, heading direction, and course over elapsed time.
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Are global navigation satellite signals like GPS, Glonas, Navic, or Galelio received under water ? Can Radio frequency signals penetrate underwater ? Up to what depths ? If not then what sensor systems are used for navigation?
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Thank you so much Marc Schmieger and Recep Turan
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Tell me about the apps you can’t live without
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Hi
The UTM Geo Map software is so good for android.
Goodluck
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In the U.S., Executive Order 13905( Federal Register : Strengthening National Resilience Through Responsible Use of Positioning, Navigation, and Timing Services) signed 02-12-2020, ordered several federal agencies to conduct vulnerability assessments related to critical infrastructure. I'm looking for qualified opinions / research on the potential for degradation or loss of access to GPS / GNSS to potentially impact critical infrastructure at hydro-electric dams.
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Well, 'Yes'. And not just the obvious spatial difficulties, it is the reliance on timing signals. The epicenter is NIST: Overview at https://www.nist.gov/news-events/news/2021/02/nist-finalizes-cybersecurity-guidance-positioning-navigation-and-timing and from there are other domain specific documents like https://www.nist.gov/news-events/news/2019/08/situational-awareness-electric-utilities-nist-publishes-cybersecurity
Behind all these is usually quite a paper trail of conference presentations, meeting transcripts, etc. from stakeholders providing input, usually referenced in the bibliographies of the documents. The exceptions are, obviously, classified content with specifics on actual incidents and unresolved current vulnerabilities.
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I am preparing a grant and would like to collect 24-hour HRV at multiple time points. I'm looking for affordable, validated devices that would be ideal for my study- and importantly, they cannot have GPS capabilities. I cannot use any of the devices I am familiar with, and I am not having much luck with identifying other possibilities. Any suggestions would be much appreciated!
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Design some novel device based on photoplethysmography (PPG) and record the data in a data storage chip. and then access the recorded data as per your convenience.
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Hi,
I need to calculate the abundance of a single species from the occurrence data collected from the field. It is not possible to record every GPS co-ordinates for the species in an area more than 250 square kilometres. Is there any apt method to estimate abundance, like random replacement model?
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Thanks for your time for me. My query is on finding out the (X,Y) coordinate of an IMU (Using 6050 MPU) mounted object (Without any GPS).
While performing the task we are getting fluctuating acceleration data how can we resolve it?
It will also be very helpful if you suggest any other MPU for better performance.
Thank you
With regards,
Bhaskar
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Make sure you are using some sort of low-pass filter for the acceleration integration. You also want to ensure you properly calibrate the sensor. I cover calibration of the MPU6050 with the AK8963 magnetometer (MPU9250 package) in a recent tutorial:
I cover using a Butterworth filter for stabilizing the acclerometer output. I also show double integration of the acceleration to approximate displacement. The MPU6050 is a fairly good choice. There is also a more recent sensor (ICM-20948) which is considered a replacement for the MPU9250. Here is an example smoothed output of the calibrated and integrated acceleration:
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The Total Electron Content (TE C) is the amount of free electrons along t he path of the electromagnetic wav e between each satellite and the receiver, given by
TEC= = ∫ N ds
where N is the electron density.
It is an important geophysical parameter, which has also appli cations for correcting navigation measurements for single frequency recei vers.
The TEC has been measured for decades using the Farad ay Rotation effect on a linear polarized propagating plane wave (Klobuchar, 1985 and 1996). Special transmitters in geostationary and non-geostationary satellites were used for this purpose. But today TEC measurements are mad e mostly using GPS data, , which can provi de at least 4 and up to maybe 9 TEC v alues within 1000 km from the receiving station sim ultaneously every 30 seconds (usual period).
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Thanks for your reply Muhammad Ali
i know about the theory
i want MATLAB code for this
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I have a problem in which a right hand circular polarized wave (GPS wave) encounters an ideal smooth plane obliquely, and then is reflected off that. To solve this kind of problems, the wave is decomposed into two perpendicular linearized polarization (vertical and parallel or S and P) and then the reflection coefficient of each component is calculated through Fresnel formulas. But I want to calculate an overall reflection coefficient for above mentioned right hand circular polarized wave and I could not find any method for summation of two vertical and parallel components in any reference.
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Dear Dr Ijaz:
Thanks in advanced.
As you know when a wave have an oblique incidence with a plane, to calculate Fresnel reflection coefficient, the wave is decomposed into two S and P polarization (referred to "https://www.brown.edu/research/labs/mittleman/sites/brown.edu.research.labs.mittleman/files/uploads/lecture13_0.pdf" ) and then Fresnel reflection coefficient for each of S and P polarization is calculated separately. and I am seeking for a way to calculate the sum of these two reflection coefficients (note that we can not use arithmetic sum). because I need the overall reflection coefficient.
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I have time series GPS tracking data from a number of individuals, all with varying time between locations (i.e. certain individuals recording at 15 minutes intervals, others at 20 minutes or 1 hour). Tracking starts at sunrise and ends at sunset, omitting overnight locations. I would like to subset the data to 1 hour to make it comparable. I am currently doing this in excel although it is proving to be a rather tedious method. Is there a method in R that can speed up this process?
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There is a easy way to do this in PYTHON.
The function called "resample" and "groupby" are most used function for time series analysis.
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How I use GPS in the field of agricultural mechanization to select appropriate machinery or technology based on soil, field, and crop condition?
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Excellent Question Dr. Md. Anwar Hossen. I Follow
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I have some GPS data for Iran. their stable framework is Arabia. for comparison them with other GPS data, I need to change their framework into Eurasia instead of Arabi. Is there any suggestion for this conversion except calling the authors?
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Finding the datum is a more involved process than transforming data into a different datum. At issue is how the data are collected and how the GPS system works. If you consider that you are starting with a coordinate system that is earth-centered and earth-fixed (ECEF)with without reference to a surface, in other words, one that is solely based on the orbital mechanics of the satellites, this starts to make a bit of sense. These "ECEF" data are transformed using a reference datum, which in turn has a reference ellipsoid (describing the shape of the Earth for the purposes of measurement) to provide points in the described space, that usually correspond to "points on the ground". If you know the working datum and reference ellipsoid, you can recreate the ECEF parameters and transform the data to another reference system, but without the starting point it is nearly impossible.
gerry
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I am trying to implement Kalman filter to get rid of multipath error points on GPS data while my data contains Latitude, Longitude, accuracy, altitude, speed and time. I am using python but unable to figure out how can I choose parameters for solving this issue.
Guidence will be very much apreciated.
Thanks in advance
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Why not learn the parameters from some training data
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How to increase GPS Receiver Power without increase the supply? Only the physical structure.
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You need to use a receiver digital antenna array. She increases SNR by digital beamforming on the basis of Fast Fourier Transform.
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We want to conduct a boat survey and need to track the trajectory and need to register the location and time of animal sightings. The logger should have a decent battery life, at least for 3 or more days.
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Thank you for your constant help Hayder Dibs . Garmin GPS will be costlier for us, because we want to deploy those on fishing vessels and there is hardly any network out in the sea, so I doubt how effectively will cellphone GPS work.
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I want to install GPS trackers on hare (Lepus timidus).
What I need is probably an GPS/GSM logger, weight approx. <50 g
·        Is there someone here, having experience in this kinds of work?
·        How works the GPS-collar – What is the price - How reliable are they?
·        Is it some company/web page you can recommend?
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HI, I am interested in experience regarding brown hare (Lepus europaeus) tracking devices.
When is the best time to set up a tracking device for brown hare that need to be released from the rearing farm in to the hunting ground.
It is clear before we release him, but there is a fear that he will under huge stress during fastening on. Is there any safe way to do this?
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Hello, I have mapped the locations of several individuals of a certain species of bird. I have the GPS coordinates, the date and the time data every half hour for several consecutive days and I am trying to apply the Package 'mkde' to get the kernel density maps based on the movement (home range). Is there someone with experience in using this package who can help me?
Thank you very much!
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Alas, don't know that program. But there are a number of others that might serve your needs including the density analytics in, for example, the ESRI tools like ArcGIS and ArcPro.
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What is the principle of RTK (Real Time Kinematic) in the using GPS in topographic and bathymetric survey?
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In bathymetric survey, it is a combination between GPS-RTK coordinates for a such reference datum in the measurement ship and connected to an Echo sounder to estimate the depth of the water related to the same datum. then you get a sheet of coordinates with bed levels.
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I want to if the Assisted GPS (AGPS) available in Africa or not
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I have no broad information related to the all african countries ,whether they are using AGPS or not.But, in Ethiopia it is being deployed currently along with TMA( Tower mount amplifier) at the telecom tower site.Faster position acquisition and mobile battery saving mechanism of AGPS is getting popularity in Ethiopia(Ethio telecom)
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G'day all,
I am undertaking an undergraduate project where I'll be conducting some frog surveys and I was wondering what the best handheld GPS unit would be for this work that won't break me financially?
Additionally, how accurate are the GPS receivers in smartphones such as Samsung Galaxy S9's or tablets such as iPad's these days, and would it be acceptable to use one of these options instead?
The survey work will be in woodlands working in and around drainage channels so I am a bit concerned about the accuracy in this kind of environment.
Thanks in advance.
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Please see some of the papers we developed at gps-test-site.uga.edu/.
In general, a recreation grade GPS (inexpensive GPS, watch, or phone) has an average accuracy of 6-10 m. A better GPS ($1000-5000) should have an average accuracy of 2-3 m. None of these are "sub-meter" accurate on average.
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We are currently planning to conduct Freight Master Plan in the state of Qatar, one of the requirements is to conduct travel time surveys, therefore we are currently searching for GPS devices that can serve this purpose, what brands/models do you recommend.
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One option is use a GPS with a laptop or other device that can log data. But if you prefer data logging Novatel is the best option, I think. See https://docs.novatel.com/OEM7/Content/Operation/Logging_Retrieving_Data_Overview.htm?TocPath=Operation%7CReceiver%20Operation%7CLogging%20and%20Retrieving%20Data%20Overview%7C_____0
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Dear colleagues,
may I ask you which App do you commonly use for taking your Geospatial data on IOS? I prefer RAW GPS Pro but it seems to be outdated now...
Thank you in advance
Andreas Külzer
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Andreas,
Another one of the ArcGIS app that works well on a iOS is an app called Quickcapture for ArcGIS. It is great for very simple data collection tasks.
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I assume this threshold (3 or 5%) as commonly used in several papers but I'm not sure if there is a world-recognized reference to state this. thanks for suggestions.
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I think it is a practical experience value. The electronics itself have relatively small weight. The problem is with the weight of the battery. If there is a low weight harvesting device with for example the supercapacitors storage, one may come up with even smaller weight than the 3 percent of the birds weight.
I think the weight carried by the bird can be estimated to be equal with the weight of the food in its somatic not to load it during the flight.
Best wishes
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I focus on urban displacement and mobilities and I am looking for a good/cheap gps tracker to document people's urban mobility. Some of my work is in the global south and so I cannot rely on smart phones. Can someone recommend a good GPS tracker (around $50) that people can carry in their purses or coat pockets?
thanks!
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Hello Mr. Gable,
I am a student at Coastal Carolina University currently doing a matlab project regarding animal migration. I saw your GPS data of the six packs of wolves avoiding paths (Reddit), and I was wondering if you would be willing to send me this data (via cvs if possible). This would be perfect for my project and I would love to share this with my class. I think its super cool and a lot more interesting than any bird migration that I was originally planning. Please let me know if this is something you would be willing to do; I just have to be able to transfer this into Matlab for my project. Thank you for your work.
Nick Turner
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I am interested but how can I?
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I am looking for a good book that can help me explore the road navigation systems.  The key details i am looking for are;
  1. The scientific relationship between GPS Navigation and road safety.
  2. The History of Road Navigation Systems.
  3. What was the cause of this kind of innovation?
  4. Does the use of Navigation Systems increase road safety? How?
The questions above and more are the examples of the research questions I need to answer so I can gain some knowledge on GPS Navigation. 
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I am a looking for feedback in terms of reliability, lifespan, drop-off possibilities, user friendly interface of the website and possibility for the stakeholders to check the data of a single animal. 
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I have worked with both lotek iridium and vectronics argos, all worked well in the field, over 85% tranmission rate in steppe mountains. Lotek drop off worked well
When refurbished, did not work well
Mohammad
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Using GPS in Rio de Janeiro city to move in transit has proved, with no caveat, to be very dangerous for those who do not know the area. One can easily find himself inside a dangerous slum, just to avoid traffic jam, and get really in life - threatening - troube with drug dealers.
The situation below is not unique and do not hapen only to foreigners.
Turista suíça baleada com o marido na Cidade Alta depõe por mais de quatro horas
"Ainda na noite deste domingo, a mulher prestou depoimento na 38ª DP (Brás de Pina) e contou que o marido seguia pela Avenida Brasil quando o GPS indicou a entrada da favela como melhor caminho para evitar o congestionamento que existia na via."
Swiss tourist shot with husband in Upper Town testifies for more than four hours
"Still on Sunday night, the woman testified at the 38th DP (Brás de Pina) and said that her husband was following Avenida Brasil when the GPS indicated the entrance of the favela as the best way to avoid the congestion that existed on the road."
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Great desicion.
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Use of precision technologies for identification of COVID-19 patients
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Yes
we can use new techniques also such as
  1. Geo-fencing to patients to track the movement
  2. demarcating containment zone
  3. spatial distribution of patients
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I want to validate the speed from a GPS sensor by measuring its accuracy during biking. However, in my research, I want to attach GPS to humans (my subjects are humans and the topic is their movement). Is it scientifically valid to do so? Can I publish it?
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The gps device has accuracy up to 5 meters. How to calculate speed from the GPS readings. I have latitude, longitude, altitude and data is sampled at 20Hz.
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I have already written about it above.
If you have to calculate yourself, be sure to read to the end.
Once Again: If your GPS receiver sends data in NMEA format, you can read velocity directly from NMEA sentence RMC, or VTG.
There are format for these sentences:
-----------------------
RMC Recommended Minimum Navigation Information
1 2 3 4 5 6 7 8 9 10 11|12
| | | | | | | | | | | |
$--RMC,hhmmss.ss,A,llll.ll,a,yyyyy.yy,a,x.x,x.x,xxxx,x.x,a*hh
1) Time (UTC)
2) Status, V = Navigation receiver warning
3) Latitude
4) N or S
5) Longitude
6) E or W
7) Speed over ground, knots <-------- this is for you !!!
8) Track made good, degrees true
9) Date, ddmmyy
10) Magnetic Variation, degrees
11) E or W
12) Checksum
-------------------------------
VTG Track Made Good and Ground Speed
1 2 3 4 5 6 7 8 9
| | | | | | | | |
$--VTG,x.x,T,x.x,M,x.x,N,x.x,K*hh
1) Track Degrees
2) T = True
3) Track Degrees
4) M = Magnetic
5) Speed Knots <-------- this is for you !!!
6) N = Knots
7) Speed Kilometers Per Hour <-------- this is for you !!!
8) K = Kilometres Per Hour
9) Checksum
---------------------------------
For more information you can find by Google file: NMEA0183.pdf .
Do you have to calculate the speed yourself?
If yes, You must convert the geographical coordinate difference to a distance in meters. You need to take into account the shape of the Earth.
Please read my article.
"Experimental study of a positioning accuracy with GPS receiver"
DOI: 10.13140/RG.2.1.3349.3528
The full text is available on ResearchGate:
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Hi all,
First of all, I'm sorry for my English :)
I'm studying on GPS modeling in Matlab/Simulink and new to this area. When I look at some sensor datasheets for noise error parameters like standard deviation, correlation time etc., I couldnt find it from datasheets. Does anyone know about it?
Also, I found a book on GPS modeling. Parameters' values are given in this book as in the attached picture. When applying this parameters to my simulation model, it doesn't work properly.
Thanks in advance,