[Ovmsdev] GPS flatbed alerts from military jamming/spoofing?

Thu Mar 31 14:15:15 HKT 2022

I've had no GPS false alerts since Craig added the NMEA checksum 
validation and I fixed the VW e-Up state detection.

That is, until war on Ukraine began. Since then, I've had multiple 
alerts, mostly late night. I wouldn't have thought military GPS jamming 
or spoofing would have an effect with that range, the next war region is 
~ 1.200 km from here.

I've added some more logging to see if we can detect and filter this.

Reduced log from the latest event below. HDOP jumps from 1.8 (good) to 
5.6 (bad), but only after the alert has been triggered.

Should we generally scale the alarm threshold by HDOP (if available)?

Regards,
Michael

01:31:35 vehicle dist=15   smoothed=13 alarm=500 gpsmode=AA satcount=6 
hdop=2.0   gpsspeed=0.0
01:48:30 vehicle dist=15   smoothed=15   alarm=500 gpsmode=AA satcount=5 
hdop=1.8   gpsspeed=0.0
02:04:10 vehicle dist=15   smoothed=15   alarm=500 gpsmode=AA satcount=4 
hdop=1.9   gpsspeed=0.0
02:20:50 vehicle dist=14   smoothed=16   alarm=500 gpsmode=AA satcount=3 
hdop=500.0 gpsspeed=0.0
04:15:15 vehicle dist=260  smoothed=60   alarm=500 gpsmode=AA satcount=4 
hdop=1.9   gpsspeed=0.0
04:15:15 vehicle dist=297  smoothed=107  alarm=500 gpsmode=AA satcount=4 
hdop=1.9   gpsspeed=0.0
04:15:20 vehicle dist=216  smoothed=129  alarm=500 gpsmode=AA satcount=4 
hdop=1.9   gpsspeed=8.5
04:15:20 vehicle dist=184  smoothed=140  alarm=500 gpsmode=AA satcount=4 
hdop=1.9   gpsspeed=8.5
04:16:00 vehicle dist=1162 smoothed=344  alarm=500 gpsmode=AA satcount=4 
hdop=1.9   gpsspeed=0.0
04:16:00 vehicle dist=1322 smoothed=540  alarm=500 gpsmode=AA satcount=4 
hdop=1.9   gpsspeed=0.0
04:16:00 CEST W flatbed.moved                      gpsmode=AA satcount=4 
hdop=1.9   gpsspeed=0.0
04:16:05 vehicle dist=1419 smoothed=716  alarm=500 gpsmode=AA satcount=5 
hdop=1.8   gpsspeed=0.0
04:16:05 vehicle dist=1426 smoothed=858  alarm=500 gpsmode=AA satcount=5 
hdop=1.8   gpsspeed=0.0
04:17:25 vehicle dist=710  smoothed=828  alarm=500 gpsmode=AA satcount=5 
hdop=5.6   gpsspeed=5.2
04:17:25 vehicle dist=303  smoothed=723  alarm=500 gpsmode=AA satcount=5 
hdop=5.6   gpsspeed=5.2
04:17:30 vehicle dist=245  smoothed=627  alarm=500 gpsmode=AA satcount=5 
hdop=5.6   gpsspeed=0.0
04:17:30 vehicle dist=233  smoothed=549  alarm=500 gpsmode=AA satcount=5 
hdop=5.6   gpsspeed=0.0
04:17:35 vehicle dist=161  smoothed=471  alarm=500 gpsmode=AA satcount=5 
hdop=5.6   gpsspeed=13.7
04:17:35 vehicle dist=143  smoothed=405  alarm=500 gpsmode=AA satcount=5 
hdop=5.6   gpsspeed=13.7
04:17:40 vehicle dist=100  smoothed=344  alarm=500 gpsmode=AA satcount=5 
hdop=5.6   gpsspeed=0.0
04:17:40 vehicle dist=87   smoothed=293  alarm=500 gpsmode=AA satcount=5 
hdop=5.6   gpsspeed=0.0
04:17:45 vehicle dist=50   smoothed=244  alarm=500 gpsmode=AA satcount=5 
hdop=5.6   gpsspeed=0.0
04:17:45 vehicle dist=36   smoothed=203  alarm=500 gpsmode=AA satcount=5 
hdop=5.6   gpsspeed=0.0
04:17:50 vehicle dist=127  smoothed=187  alarm=500 gpsmode=AA satcount=5 
hdop=5.6   gpsspeed=0.0
04:17:50 vehicle dist=136  smoothed=177  alarm=500 gpsmode=AA satcount=5 
hdop=5.6   gpsspeed=0.0
04:17:55 vehicle dist=110  smoothed=164  alarm=500 gpsmode=AA satcount=5 
hdop=5.6   gpsspeed=0.0
04:17:55 vehicle dist=104  smoothed=152  alarm=500 gpsmode=AA satcount=5 
hdop=5.6   gpsspeed=0.0
04:18:00 vehicle dist=107  smoothed=135  alarm=500 gpsmode=AA satcount=6 
hdop=1.8   gpsspeed=0.0
04:18:05 vehicle dist=57   smoothed=119  alarm=500 gpsmode=AA satcount=6 
hdop=1.8   gpsspeed=9.4
04:18:05 vehicle dist=44   smoothed=104  alarm=500 gpsmode=AA satcount=6 
hdop=1.8   gpsspeed=9.4
04:18:10 vehicle dist=34   smoothed=90   alarm=500 gpsmode=AA satcount=6 
hdop=1.8   gpsspeed=7.2
04:18:15 vehicle dist=17   smoothed=66   alarm=500 gpsmode=AA satcount=6 
hdop=1.8   gpsspeed=7.8
04:18:15 vehicle dist=6    smoothed=54   alarm=500 gpsmode=AA satcount=6 
hdop=1.8   gpsspeed=7.8
04:18:25 vehicle dist=25   smoothed=35   alarm=500 gpsmode=AA satcount=6 
hdop=1.8   gpsspeed=1.7
04:18:25 vehicle dist=29   smoothed=34   alarm=500 gpsmode=AA satcount=6 
hdop=1.8   gpsspeed=1.7
04:18:35 vehicle dist=25   smoothed=30   alarm=500 gpsmode=AA satcount=5 
hdop=1.8   gpsspeed=0.0
04:32:25 vehicle dist=15   smoothed=15   alarm=500 gpsmode=AA satcount=4 
hdop=1.9   gpsspeed=0.0
04:48:15 vehicle dist=15   smoothed=14   alarm=500 gpsmode=AA satcount=5 
hdop=3.1   gpsspeed=0.0
04:48:20 vehicle dist=15   smoothed=14   alarm=500 gpsmode=AA satcount=5 
hdop=3.1   gpsspeed=0.0
04:48:25 vehicle dist=18   smoothed=15   alarm=500 gpsmode=AA satcount=4 
hdop=3.1   gpsspeed=1.5
04:48:30 vehicle dist=14   smoothed=16   alarm=500 gpsmode=AA satcount=4 
hdop=6.2   gpsspeed=0.0

-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26

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