Questions related to Satellite Communication
I am trying to execute the "satelliteScenarioViewer(sc)" command of the Multihop Regenerative Repeater Link Between two ground stations, an example of the Satellite Communications Toolbox. One error occurs stating that MATLAB has disabled some advanced graphics rendering features by switching to OpenGL software. Hardware graphics with WebGL support is required to solve this error. As my system is not compatible with this so I am trying to update software graphics by using the following command as provided in this link:-
This is again not working.
Any new and innovative topics in this field will be appreciated; Radio Communication, Antennas and Propagation, Satellite Communication, Microwave Communication, Radio Propagation
As far as I know, some types of antennas are used in satellite communications such as reflector antenna, reflectarray antenna, and array antenna. But which one of these or another antennas will be more useful in next-generation of satellite communication?
I am looking for research idea in Satellite Communication systems for my master research. I work in Broadcasting. Your good suggestions will be highly valued. Thank you
Hi, I am a student who just started working at a space industry, and I want to know how to teach myself to use HFSS. I have experience with 4NEC2, but HFSS just seems much more complicated, and I was wondering if any experienced people here have tips or manuals to share? My model is a conical shape for cube satellite, at frequency of 2.4 GHz.
Please is it possible to use MATLAB in analysing the sharing and compatibility studies between Satellite Communication systems and 5G systems using the Monte Carlo Simulation approach rather than the Minimum Coupling Loss approach?
OR the Monte Carlo Simulation approach in analysing sharing & compatibility studies is only implemented using Spectrum Engineering software (e.g. SEAMCAT) other than MATLAB?
Is there any 5G ray tracing software that can simulate channel sounding at 5G.If you know any such software- open source or commercial, let me know
I am presently enrolled as an MSc Electrical Engineering (Telecommunication Option). I have finished my coursework and about to engage in my research but I am having difficult in getting a Research Proposal Topic. I actually want to work in Satellite Communication but also finding it difficult to narrow the area of interest. With this, I am kindly asking for your assistance/guidance or any suggestion that might help. Thank you for considering my request and look forward to hearing from you.
Satellite communication with wireless devices using OMNET++ simulation tool. I have created 5 mobile devices and set their behavior in the .cc file. They show mainly 2 behavior; signal send/receive from satellite and movement. But while simulating the source code either of the two behavior is executed (i.e, either signal send/receive or movement). Initialization of the architecture is done inside .ned file.
If anyone is following the platform, please give your suggestions; how to run the 2 behaviors simultaneously.
Could EMF generated by a big electricity substation and / or satellite communications facility discourage microbats / interfere with microbat echolocation? Surveys using an Anabat detector in this part of northern Sydney often record few or no calls at all. It is an area with lots of bushland, so habitats are otherwise very good.
What is meant by the "Physical Layer" in Satellite Communications?
As well as how it is different from the 7 layers OSI model of computer networking?
It would be a great help if you could give me some ideas.
Thank you in advance.
The space shuttle repair and maintenance is often very challenging and require very specific Space Robotics & Automated Systems that are interconnected via Satellite Communication Systems.
The nanosatellite operating in amateur radio frequencies have limited bandwidth. 2m band have 144-146MHz and 70cm band have 434-438MHz. How much bandwidth (Maximum) we can use in this?
Norwegian Post and Telecommunication Authority (NPT) says the maximum bandwidth are limited to 18KHz and 30KHz respectively. Is this applicable for every region?
On 8th page of document Johan L. Tresvig say a regulationby norwegian goverment. What I would like to know is whether any other contries or organization set a limit to the bandwidth.I couldn't find much details about this in internet.
I followed method suggested by G. Ma(2003) to estimate GPS receiver bias and calculated VTEC by removing Receiver Bias (Standard Deviation Method), it performs best but I get few values with negative VTEC at 30o elevation cut off.
Any suggestions relating to this will be helpful. Thanks.
STK Analyzer tool is an awesome tool for designing an experiment. I tried to use it for selecting both the constellation and orbital parameters based on the elevation angle between the ground stations and all the satellites in a constellation. Using macros in Analyzer may be a way, but it needs more participation from specialists. Hence, any thoughts?
as you may know iranian govt (and some other countries) use territorial jammers to disturb satellite signals. i've seen a lot about jamming cancellation using beam forming methods but my question is:
does any method exist that can be applied to this special problem? considering that any recommended method should perform signal processing after LNB ,
my initial guess is to use an array antenna and a FPGA board to process data between LNB and receiver and use a beamforming method but i dont know much about the output of LNB and jamming effects on that i will appreciate any help on this issue too
I'm working on passive radars, I have a reference channel and a surveillance channel! I want to simulate the signal received on the surveillance antenna composed with reflexiosn from clutter interfering targets , target of interest and noise.Having just the SNRis , the time delays and doppler shifts and the reference channel, how can I do that since I haven't the amplitudes.
thanks in advance
In WBAN, pulses are transmitted from an antenna , diffract around the body and can reflect off of arms and shoulders. so there are always two clusters of multi path components due to the initial wave diffracting around the body, and a reflection off of the ground.
I need to work with ZigBee (Narrow band data rate), Can I ignore the effect of reflection components in describing narrowband channel in small scale Statistics?
And take only the effect of diffraction?
Terminal equipment should be capable of video/voice/data communications, preferably if it can act as GIS terminal too.
Modelling and simulation of nonstationary land mobile satellite channels by using extended suzuki and handover processes.
(city 25.mat and sub 15.mat)
Hello, i am trying to generate zenith angle of elevation and departure for SCM based wireless channel simulator. My end goal is to get the channel coefficients with respect to azimuth and elevation, so that i can apply beam-forming algorithms at Tx to enhance and analyse the overall system performance specifically vertical and horizontal beam-forming
PS: My Tx is a planar antenna with 100 dipole antenna's in a square grid. I already wrote my matlab code using the 3GPP technical report -(study on 3D channel Model for LTE) but i just want to be sure that i am going in the right direction. Your kind help would be highly appreciated:)
In VTEC maps that have been created from GNSS differential phase measurements of the TEC, the ionospheric pierce point is often shown. TEC that is measured over 20 200 km is mapped to somewhere between 400-600 km.
In GNSS computerized Ionospheric tomography (CIT), the electron density maps are only shown to an upper altitude of 600-1000 km.
Above what altitude is the contribution to the TEC considered negligible? Stankov et al. 2003 state, "The electron density above approximately 2000 km contributes little (less than 5%) to the integrated electron content and above the mean height of the plasmapause (25,000 km) the contribution is negligible." I seem to recall reading the contribution above 1000 km "is negligible" in another paper. What is the consensus?
Please provide a reference for a characteristic altitude.
For completeness, I believe the lower limit of the TEC integral is at about 60 km, assuming the tropospheric contribution is also negligible. Please correct me if I'm wrong.
Stankov et al., 2003, A new method for reconstruction of the vertical electron density distribution in the upper ionosphere and plasmasphere, available from: http://onlinelibrary.wiley.com/doi/10.1029/2002JA009570/full
i hope someone can help me on the design of the vsat network for the calculation of the number of the vsat in the star Architecture
We would like to put collar on foxes in the Arctic. T°c can reach -40°c. We have a very small budget, so Telemetry solution etc... are far beyond what we can spend.
So we need a GPS logger that can resist to those extreme T°c and a drop-off system, and obviously a VHF unit to be able to find the collar again. Foxes are not easily trappable many times. The best, I think would be to have a WiFi tool on the GPS unit that could send the data on an external logger that we could set up on the dens for example, so that most data are safe. Has anyone does that before, or has a suggestion?
Thanks for your help!
As we know any flying object like LEO Satellite or UAV its elevation angle of antenna of a ground(Earth) receiver starts from some value reaches a peak (maximum value) when flying object is just above your head then it starts decreasing and decreasing after some time it reaches below the earth surface and or elevation reaches zero .
Now we take an example of a signal tracking of low earth orbit satellite satellite. suppose we have a signal receiver at ground and trying to receive the satellite signal. as the elevation angle increases the received signal strength increases, this strength keep increasing as the elevation angle keep increasing . the strength of signal reaches maximum value when the satellite is just above our head after that satellite elevation decreases so the receive signal strength reaches a minimum value at minimum elevation.
the requirement is mathematical formula which provide relation between receive signal strength and elevation angle.
I found paper attached which derived probability density function of elevation angle .how can I use this pdf function in order to get the receive signal strength(or SNR) from this pdf formula. do we need another formula or some changes is required to this formula.
I shall be very grateful for help.
Given a specific bandwidth, is there anyway I can relate it to how much data transfer rate can be achieved? Or the other way around (given a specific data transfer rate, how much satellite bandwidth will it need)?
I know this is in dependence of the modulation/codification (MODCOD) used, as well as the service, but is there any mathematical relation? I'm guessing it involves C/No, Eb/No, etc.
Would appreciate specific text recommendation.
Most of the GSO(Geo synchronous orbit) satellites operate in L band and/or S band. What makes the bands convenient for satellite communication?
What is the scientific facts behind that?
Also that how to represent CDMA, 3G, 4G and 5G.
How to represent Satellite radio communication?
I am developing a plugin using PyQGIS, the raster data sets in use are quite big in size hence making the interface to appear as "not responding" despite the execution being done in the background. I have gone through a number of sources but I can't get to understand how to properly implement multi-threading to update a progress bar in my plugin. Which sources should I use for a better understanding of the implementation? Ideas will be appreciated.
SSPA is linear and TWTA is more efficient. How are linearity and efficiency of high power amplifier related? Where should I concentrate more; on linearity or efficiency?
I got the output for combinational TEC,but when coming to kalman filter, I am getting confused about which terms to be used in the equation,
Surely, it is widely knows that TCP/IP satellite networks have a very high latency, specially for GEO links. However, which factors would be the most influent on the jitter for TCP/IP over satellite links ?
Generally, for satellite communication circular polarization is required. But, my doubt is can't we use linear polarization for satellite communication (within the satellite).
For mobile satellite communication system, Such as Iridium system in which every satellite could establish four links with its neighbor, can it be regarded as a DTN? And, if we could design the satellite constellation in term of DTN, could it reduce the cost of satellite networking and make the satellite Internet be popular?
Delay and Disruption Tolerant Networking could be an alternative solution for space network, I do research on space network, mainly about routing protocol. I want to consider the QoS and congestion in the space network. Could anyone recommend some related works?
Both IETF RFC2488 (Enhancing TCP Over Satellite Channels) and RFC3135 (Performance Enhancing Proxies Intended to Mitigate Link-Related
Degradations) provides some reccomendation/advice on usage of TCP over long latency links (e.g. Satelltes bridges), however, as of 2015, which are the most commonly adopted techniques in commercially available equipment ?
Which would be the most commonly used Channel Equalization techniques for Satellite Links (regardless of the Medium Acess Schemes used, SCPC, DVB-S, DVB-RCS, etc .... ) which are publicly known/available ? Here i'm also considering both linear and non-linear techniques and algorithms.
Can I please get some relevant paper on different algorithms used to estimate the power loss in dB caused due to the atmospheric losses such as ionospheric effects and troposphere effects while performing inter satellite links/communication/ranging (e.g.: MEO to MEO)? I have the entry and exit points in the atmosphere along with satellite coordinates
How would it be possible to map the different QoS and/or DifffServ/IntServ QoS types into the DVB-RCS Acess Scheme and Bandwidth allocation policies . I.e. : CRA, RBDC, VBDC and ?
Is the effect significant? Is it useful or not? Is there really any effect in the received datarate? Are there effects in other forms of mobile communication?
I would like to calculate the propagation losses in dB (ionosphere, troposphere) when an inter satellite link is established between the MEO-MEO satellite. If there is any algorithm or model, i can use it for the implementation.
Could anyone please let me know the procedure of making fine resolution DEM from CARTOSAT image. I would be happy even if you can help me to send relevant literature to prepare DEM.
My objective is to check the impact of LU/LC change on runoff.
Which simulator software can best help to simulate mobility across hybrid terrestrial-satellite networks?
I'm wondering if there are any low cost SDR Satellite Channel Emulators.
I'm looking at emulating the Doppler Shift for VHF & UHF frequencies as seen by ground stations that don't dynamically tune. In this instance the ground stations have a fixed central frequency.
Has anybody tried using a HackRF to emulate Doppler Shift? Probably for something like GPS and or GNSS?
How can I use Python and GDAL to perform raster algebra? Is there a way that I can declare two or more satellite images lets say as A and B and thereafter use python and GDAL to perform raster algebra A*B = C?
I am looking at laser communications between satellites and ground stations. I have been reading about nanocircuitary and plasmonic lasers. It does seem interesting but due to my limited background knowledge on microfabrication, I was wondering if other researchers in this field felt it was a possibility.
Literature uses 1112 ESH for a year on GSO with north-south faced satellite. This can be found on:
"Degradation of thermal control materials under a simulated radiative space environment" by A.K. Sharma and N. Sridhara
"Evaluation of Thermal Control Coatings Degradation in Simulated Geo-Space Environment" by J. Marco and S. Remaury
and other publications. How does this value derives in detail? My approximations show results around 886 ESH.
I am working on project related to wireless standard LTE and DVB-RCS. I have simulated individual blocks like modulator or FEC in MATLAB but I have to simulate full system and for that I would like to know which software is proper to get correct results.
I am a research student and want to look a little more in the Satellite Comms Diversity Technique and would like to see the Satellite Communication Diversity Performance Tool works.
Thank you very much
I want to know the acceptable model to estimate the attenuation due to rainfall in the northern Africa region.
My aim is to design a LEO constellation to have regional cover.The number of satellite is 12 so my network has inter satellite link sometimes. But I do not know the typical frequency that ISL works at. And how to calculate the ISL budget. The other question is how can I simulate ISL and which software is useful?
I am investigating the performance of OPLL in optical inter satellite communication systems.
I have made numerous simulations and in all of them, the performance was found to better for a higher bandwidth. My hypothesis is that at some point the performance should worsen for very high bandwidths as well because of the shot noise(AWGN). Is it correct? Can anyone throw some more light on this?
Positions of a GPS user and GPS satellite were calculated from Kai Borre MATLAB programmes.
I want validate my results. Do you know of any interactive tools that give the results of user and satellite?
The cause of air disasters may range from bad weather to technical glitches. The worst part is when nothing is known about the location of crash sites like that of the MH370. The knowledge of what happened or where a disaster occurred may at least loosen the mystery surrounding them. This would not only answer those grieving relatives of the lost ones who have lost all hope in knowing what happened to the fate of their loved ones but also help in analyzing and resolving future air disasters. It is challenging to imagine that in this age of space exploration where humans have been able to cross interstellar space, we have still not been able to accurately monitor the space around our own home planet. Although reconnaissance missions may have clandestinely been able to monitor regions of the earth with sub-centimeter level resolution, it would be worthwhile to put them into humane operations with better temporal resolutions. Related research articles would be appreciated.
I am currently doing a project in the area of optical inter-satellite communication (GEO-LEO).
I am using a optical carrier of 281 THz, and the Doppler shift corresponding to it is +/-7 GHz. I have introduced this Doppler shift in the transmitted signal S as an offset like
S * e j2πfdoppler
At the receiver, I am using Costas Loop as a demodulator. I have to do Doppler shift compensation while recovering the signal. Guess, I have to add an offset compensator in the local oscillator.
Anybody has an idea doing this?
For some small countries which want to have their own satellite will it be possible to include the transponder and imager in the payload of the satellite?
Respected Researchers, I need to know the difference between path loss of mobile-satellite links and mobile to mobile -mobile links.
1.If i write received signal as r given by r=h*((d)^-alpha)x+n will it be correct to write such equation for satellite to fix mobile station links.where h denotes shadowed rice distribution, x is signal , and d^ -alpha denotes distance based path loss effect. as you know the distance between(slant range) LEO satellite is variable. can i take d equation for elevation angle as variable.
2. similarly for mobile to mobile channel i have r=h1*((d)^-alpha1)x+n here h1 represents nakagami-m or rayleigh channel and d denotes distance based path loss. please guide and advise whether both equations are correct to write because in most papers i have not seen any d^ path loss exponent factor.
3. if I write most people write r=sqrt(E) h1*x+n. How to relate E to distance because in my case for LEO slant range is changing.
4. Lastly How to combine path loss distance dependent factor in one network i.e in hybrid satellite-terestrial network. i.e in satellite-mobile-mobile
i.e r=h1*((d_satellite)^-alpha1)x1+h1*((d_mobile)^-alpha2)x2+n will this equation is correct. we have very large distance between satellite-mobile(d_satellite) path as compared with mobile-mobile(d_mobile) .
Any help How relate these distance with power of signal or SNR .