GPS : how location is computed, and way to improve it

[schermvlieger]

Oh lol since we're chatting here anyway: I'll have to try my Spica's GPS next time I'm in an airplane :-D

[darth_llamah]

Possibly transmitted to the rild using normal NMEA commands.

GPS uses NMEA standard- logs from GPS session, I think that rild and/or MSM6246 firmware has only partial NMEA support (assuming that modem.bin flashed with Odin is MSM's firmware)

[Lam3r_co.]

Oh lol since we're chatting here anyway: I'll have to try my Spica's GPS next time I'm in an airplane :-D

It works, but enable and lock gps signal before switching to offline mode. By some strange reason, airplane mode does not turn GPS off, when you are using it (I am aware that GPS is only recieving and there's no need to disable it).
Btw google my tracks has got HUGE problems with big travels (tried 800 and 1000km)

[minus30]

with i5700?

Sadly not, but my garmin GPSMAP60 CSx managed to get a lock while flying. Reception bars indicated bad reception though (still accurate <10m) so I somehow doubt the Spica would get a lock/reception

[darth_llamah]

It works, but enable and lock gps signal before switching to offline mode.

Spica's GPS from the software side prefers AGPS. Older firmwares seem to work with pure GPS (no AGPS data stored and data connetion disabled) better- with XXJC1/4 and XXIL2 I can get gps fix when walking or driving, which seems almost impossible with JH1 and JH6

[drebon]

Is there somewhere where I can find information on the NMEA standard; or someone that could explain me if it is possible to get the information position/time of emission of seen satellites.

If one has the ability to have that information, then getting client gps position is quite easy... With four viewable satellites (or even only 3 if one stored the earth geometry but it would probably requires a lot of space)

[darth_llamah]

Search google for more info about NMEA.
Problem is that GPS handling seems to be simplified, but there is no clue if it's software or hardware side- MSM6246 and RTR6285 which handle GPS are described as "low cost solution"