Questions related to Global Positioning System
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?
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 ?
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.
Planning to use a handy and affordable GPS receiver along with ArcGIS Field Maps for data collection.
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?
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.
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.
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.
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.
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!
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
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?
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?
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).
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:
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!
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?
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.
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.
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?
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.
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: email@example.com
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.
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
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?
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
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.
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!
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)
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.
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.
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!
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.
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 !
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
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).
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?
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.
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!
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?
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.
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).
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.
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?
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?
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
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.
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?
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!
What is the principle of RTK (Real Time Kinematic) in the using GPS in topographic and bathymetric survey?
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.
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.
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.
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?
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.
I am looking for a good book that can help me explore the road navigation systems. The key details i am looking for are;
- The scientific relationship between GPS Navigation and road safety.
- The History of Road Navigation Systems.
- What was the cause of this kind of innovation?
- 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.
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.
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."
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?
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.
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,