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| TM4313 GPSDO: strange behavior after a night of poor reception |
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| tggzzz:
--- Quote from: nctnico on April 14, 2024, 12:20:38 pm --- --- Quote from: tggzzz on April 13, 2024, 08:10:07 am --- --- Quote from: shapirus on April 09, 2024, 09:14:33 pm --- --- Quote from: tverbeure on April 09, 2024, 09:02:44 pm ---Having to deal with GPS jamming may be something the designers never thought about, especially for something as cheap as this. I mean how do you even start to cover all the ways jamming can work. --- End quote --- Well, if I had to write software handling it, I'd do it in the most straightforward way: no data? treat as lost signal; bogus data, an abrupt change of coordinates and/or timestamps received from the GPS module? discard data and treat as no signal. --- End quote --- That's only a crude version of what GPS (etc) jamming does. The more sophisticated version moves the apparent position, so that ordnance lands near the target, not on the target. I've heard reports of someone in the UK whose GPS receiver told them they were flying directly over a military airfield - but they could see the runway a couple of miles away over the top of their wing. If your problem is time-dependent, then maybe jamming only occurs when an attack is imminent. --- End quote --- You have to take into account that the map might be wrong on purpose. Theoretically you can spoof gps but it will also cause problems with car navigation systems when done permanently. --- End quote --- Unlikely in the specific case, due to the adjacent main road and town in Wiltshire. The curious issue is that there is "forbidden" airspace above that airfield. If someone was relying on GPS and penetrated that airspace, I'm not sure what would happen. I expect the attitude would be "you should look out the cockpit, because all instruments lie". Around that time there were many NOTAMs to the effect of "don't trust GPS near Aberstywth" (nowhere near Wiltshire!). Clearly jamming trials were in progress. |
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