Hi Dylan,
am I right in thinking your system is reading only positional data, ie no doppler and no trapezoidal integration?
If you upload a .sbn file or .sbp file from a GT-31 then the data is doppler. If you upload a file from a GT-11, then the data is doppler except for the Alpha-500 result, which is trackpoints.
.gpx files are treated as trackpoints.
Dylan.
It's the integration method which GPSAR is using now, although on my older version it is an option, not sure if its still optional on updates........has the effect of dropping your speeds ..depressing, that accuracy !
Do you have a link specifying that the doppler is 1sec instantaneous? The Sirf spec sheet suggests that the doppler is the average of 10 x 0.1 sec samples.
(Dylan posting via ka72"s acct)
Yes the KA72 site uses trapezoidal interpolation for speed calcs. 2sec is the most affected. 2sec peak is the average of three seconds data. This is deliberate, and a bit conservative. You can probably get better results from other software by tweaking the settings. KA72 tries to be fair by applying the same rules to everyone.
Dylan
(Dylan72 again...)
I've had a bit of a dig this morning, but I can't find anything that would lead me to believe that the GT-11 or GT-31 would use 0.1sec samples. Could you provide a reference?
Unfortunately, the most likely sources seem to be missing or very expensive to access (eg NMEA0183)
