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

[Stephen Casner]

Michael,

Aha!  I've had two false GPS alerts that occurred since I installed
the 4G modem around the end of February, but the modem change should
have no effect for my Roadster with its separate GPS sensor.  You've
identified a different possible correlation.  The distance from my
location to Ukraine is much farther, but who knows what changes may
have occurred.

                                                        -- Steve

On Thu, 31 Mar 2022, Michael Balzer wrote:

> 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