Michael, Good idea. How much time does 5 samples represent? -- Steve On Tue, 26 Nov 2019, Michael Balzer wrote:
I've had my first false alert last night, from the log it seems caused by a single false GPS reading.
I've added smoothing over 5 samples to the distance check, that should eliminate the false alerts unless the GPS errors are huge or persistent.
I've also added the coordinates to the notification so we can see how large the error can become if it still occurs.
Regards, Michael
Am 21.08.19 um 23:43 schrieb Greg D.:
Hmmpf.
Precession of the GPS constellation, perhaps? Folks in northern Nevada or Idaho should be next...
Greg
Stephen Casner wrote:
Greg,
Mine has been quiet for the past couple of months without increasing the alarm distance beyond the default 500 meters.
-- Steve
On Wed, 21 Aug 2019, Greg D. wrote:
A quick follow-up to this thread...
I've noticed that since this past spring that the number of false alerts regarding the flatbedding of my Roadster have taken a sharp spike upward. Neither my car's normal parking spot in the garage, nor the location of my house / garage have changed. The difference in frequency did not appear to coincide with a firmware update, so I'm at a bit of a loss to explain it.
Has anyone else noticed this?
Did the Government make a change to the GPS satellite fleet?
Not an issue, really, but definitely something odd going on.
Greg
Stephen Casner wrote:
Greg,
Attached are graphs of your data. gregd.all.png shows all of the data, and gregd.peak.png is the highest distance deviation of 369 meters, which is less than the default 500 meter threshold.
It looks like there is a diurnal pattern to the data with increased deviations around midnight local time (the X axis times are UTC).
It also looks like your home elevation must be about 380 meters since the altitude variable drops down to negative that amount frequently, which would occur when that value is taken as zero (there is a special case in the code to treat some values as zero).
I tried overlaying my data and yours, but there seems to be no correlation between the peaks in my data and the peaks in yours. Interestingly, my data does not show a similar diurnal pattern.
-- Steve
On Tue, 4 Jun 2019, Greg D. wrote:
200mb of logs sent to Steve for analysis....
Greg
Stephen Casner wrote:
Thanks. For me, today's log was much quieter. The maximum excursion was 115 meters and it was roughly coincident with loss of lock.
-- Steve
On Fri, 31 May 2019, Greg D wrote:
Ok. I'll let it run for a few days and see what happens. Not planning to drive the ca r until next week.
Greg
On May 31, 2019 2:11:31 PM PDT, Stephen Casner <casner@acm.org> wrote:
On Fri, 31 May 2019, Greg D. wrote:
Tried this, and am not getting anything written to the file system
(vfs
ls /sd shows zero bytes in gps.crtd). Did I miss some sort of setup
step?
Nothing gets written (or at least the file size as reported is not updated) until the recording is stopped with "can log off".
-- Steve
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