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

Michael Balzer dexter at expeedo.de
Fri Apr 1 04:29:12 HKT 2022

I've checked in my logging changes so we can collect some more data on 
this first.

The change also enables repeated alarms, the previous implementation 
would disable the alarm and further checks/logs on the first trigger. By 
default, the alarm will be repeated every 15 minutes (if the conditions 
are still met), new config for this is "vehicle flatbed.alarminterval", 
0 disables repetitions.


Am 31.03.22 um 18:51 schrieb Craig Leres:
> On 3/30/22 23:15, Michael Balzer wrote:
>> 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)?
> If we did scaling based on HDOP I think we could also lower alarm 
> distance from 500m (250m was my first guess). Here's a quick spreadsheet:
> https://docs.google.com/spreadsheets/d/1C9mvMw3PSl58qmg-lRHdzMXzB2S4glE4vitdgb4TiJ0/edit?usp=sharing 
> It's unfortunate that HDOP lags the increase in distance, maybe you 
> could adjust the smoothed calculation to damp that?
>         Craig

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

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