[Ovmsdev] GPS theft alert

Fri Feb 12 21:11:43 HKT 2021

Besides the GPS lock we've got some additional GPS detail:

  * Receiver mode (v.p.gpsmode)
  * Satellite count (v.p.satcount)
  * HDOP (v.p.gpshdop)
  * GPS speed (v.p.gpsspeed)

Maybe these can help. I've added them to the L record and added a log 
output on flatbed alerts so we can see what they provide generally and 
during a false alert.

Note: on Teslas we copy the car GPS data so we may need special handling 
there.

Regards,
Michael

Am 12.02.21 um 12:36 schrieb Chris van der Meijden:
> Just a side information.
>
> On Andorid phones it can take 10 minutes to find the satelites if the 
> time of the phone and the satelites is out of sync. And in that case 
> the position can also be a few 100 meters off track. As soon as the 
> times are in sync the GPS signal is immediately there and the position 
> is correct.
>
> Regards
>
> Chris
>
>
>
> Am Freitag, den 12.02.2021, 12:24 +0100 schrieb sharkcow:
>> OK, in my case OVMS lost the GPS fix for one log entry, then apparently
>> my car took a 400m dive! Strange theft approach... ;-)
>>
>> Took about 10mins. for GPS to be back in the correct position.
>>
>> So, would we want to implement a workaround? Maybe wait with the alert
>> after fix is lost? But then again, if the car really is towed, I'd like
>> to know asap...
>>
>> Thanks,
>>
>> sharkcow
>>
>>
>> Am 12.02.21 um 10:35 schrieb Michael Balzer:
>>> Please check your "L" log at the time of the alert: what did your 
>>> GPS data look like just before the alert? There's the option of 
>>> raising the alert threshold. It's 500 meters by default (config 
>>> vehicle flatbed.alarmdistance). But we should first determine the 
>>> cause of the false alerts. Regards, Michael Am 12.02.21 um 10:28 
>>> schrieb sharkcow:
>>>> I got the theft alert again last night, the car had been standing 
>>>> for several hours... so at least in my case I would think the alert 
>>>> trigger is too sensitive compared to the resolution/accuracy of the 
>>>> GPS measurement. Best regards, sharkcow Am 09.02.21 um 18:40 
>>>> schrieb Michael Balzer:
>>>>> I found the reason for the false theft/flatbed alert in my case by 
>>>>> checking my telemetry archive: the car lost GPS on the road. 
>>>>> Coordinates were stale when I parked the car. The stale 
>>>>> coordinates were taken as the initial park coordinates, causing an 
>>>>> alert when the GPS receiver delivered the next valid data (the 
>>>>> actual park position). So the bad antenna placement actually was 
>>>>> the cause in my case, but we can solve that in software. I've just 
>>>>> pushed a fix (untested) for this, consisting of a) making the 
>>>>> location module aware of parking coordinate staleness and b) 
>>>>> lowering the staleness thresholds for the GPS metrics to 10 
>>>>> seconds. Please verify. Regards, Michael Am 09.02.21 um 10:29 
>>>>> schrieb Michael Balzer:
>>>>>> I had the alert once with my Mii, also shortly after parking. 
>>>>>> With the module being mounted with the GPS antenna placed under 
>>>>>> the hood, I assumed that to be the cause. I doubt it, but I'll 
>>>>>> check if any of our changes could have had an impact on the GPS 
>>>>>> movement detection. Regarding open changes to be included in 
>>>>>> 3.2.016: sharkcow is currently working on finishing the UpMiiGo 
>>>>>> TPMS feature, it's already been tested so we'll wait for that. 
>>>>>> Regards, Michael Am 09.02.21 um 09:57 schrieb sharkcow:
>>>>>>> Hi all,
>>>>>>>> Twice in the last few weeks I've gotten the "possible 
>>>>>>>> theft/flatbed" 
>>>>>>> alert just as I was backing out of the garage. I have never 
>>>>>>> received that alert before. I hadn't posted anything yet because 
>>>>>>> I was waiting to drive the other car and see if has the same 
>>>>>>> problem. I get this too every once in a while with my e-Up. 
>>>>>>> Mostly shortly after parking, I think (and tragically, the one 
>>>>>>> time I'd have needed it because I actually _did_ get towed, I 
>>>>>>> had crashed OVMS into a boot loop just before :-/). sharkcow 
>>>>>> _______________________________________________ OvmsDev mailing 
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>>>>> -- Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal Fon 
>>>>> 02333 / 833 5735 * Handy 0176 / 206 989 26 
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-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26

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