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 car 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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