gps-sdr-sim
vswarm
| gps-sdr-sim | vswarm | |
|---|---|---|
| 23 | 1 | |
| 2,842 | 62 | |
| - | - | |
| 5.4 | 0.0 | |
| 24 days ago | over 2 years ago | |
| C | Python | |
| MIT License | MIT License |
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gps-sdr-sim
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11 hour GPS/GNSS Simulation on a fixed point
Looking at the GitHub, I see the duration is defined by USER_MOTION_SIZE and can be specified in either dynamic or static mode. Can I get some insight on the benefits of using dynamic/static? I need to transmit a fixed GPS point, if that matters.
- My work is now requiring we share our location in order to clock in, and it prevents us from clocking in if we’re too far from work. I work from home.
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iOS allows DNS request to escape the VPN tunnel
> not trivial or cheap
It sounds like your experience may have been a while ago? In 2022, it is fairly trivial and cheap: https://github.com/osqzss/gps-sdr-sim
I can not ;^) personally confirm that this works with a HackRF, which is like $300, but probably with any other reasonable tx-capable sdr.
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Changing the header file
Link of the repository: GPS-SDR-SIM
GPS-SDR-SIM
- Looks like the 2 month limit might make Starlink useless for travellers ☹️ (feedback from another traveller’s question)
- GPS-SDR-SIM
- IQ data formats
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An EFF Investigation: Mystery GPS Tracker on a Supporter’s Car
> while spoofing GPS is significantly harder
You are completely, utterly wrong. Spoofing GPS is downloading a file, and then running a commandline program with a hackrf attached.
Download and compile https://github.com/osqzss/gps-sdr-sim
Download today's ephermis https://cddis.nasa.gov/archive/gnss/data/daily/
run:
gps-sdr-sim -e $EPHERMISFILE -l $LAT,$LON,$ALT
And, if you're nearby an airport, you're violating felonies with FCC AND FAA.
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Decoding captured signal of RTL-SDR by SoftGNSS
I want to simulate GPS signals by using GPS-SDR-SIM (GPS-SDR-SIM GitHub page)
vswarm
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USB 3.0* Radio Frequency Interference on 2.4 GHz Devices
We had lots of issues with USB3 cameras interfering with (RTK-) GPS receivers for a drone project [0]. When mounted on the drone, the receiver would just not get a fix, even in seemingly perfect conditions, i.e. unobstructed view of the sky, far away from buildings, no clouds, etc. One day, I randomly unplugged the cameras and suddenly the receiver started working. I repeatedly plugged and unplugged the USB3 hub just to make sure I'm not crazy. The GPS receiver would go from no fix at all to centimeter-level accuracy every time I unplugged.
We then used a spectrum analyzer to better understand the extent of the interference, tried shielding as described in the whitepaper, as well as separating the components physically as much as 30cm -- all without success. The only solution that worked was to replace the USB3 cables with USB2 cables and acquiring images at a lower frame rate.
I don't even want to know how many people have been affected by these issues over the years. USB3 devices should come with a warning sticker on the box.
[0]: https://github.com/lis-epfl/vswarm
What are some alternatives?
multi-sdr-gps-sim - multi-sdr-gps-sim generates a IQ data stream on-the-fly to simulate a GPS L1 baseband signal using a SDR platform like HackRF or ADLAM-Pluto.
gnss-sdr - GNSS-SDR, an open-source software-defined GNSS receiver
SoftGNSS - UNOFFICIAL! Contains my little changes for my studies. Besides that, it is not branched from any official repo, is branched from a local PC.
unsmear - Converts to and from timescales with smeared leap seconds