Re: Never getting GPS lock

[Ben Wilson]

na, i'm on a hill, it's pretty much wide open sky.
Unobstructed to horizon for 180deg, other 180deg is about 60deg above 
horizon

Lally Singh wrote:
From: http://blogs.msdn.com/coding4fun/archive/2006/10/31/912287.aspx

    $GPGSV,2,1,08,01,40,083,46,02,17,308,41,12,07,344,39,14,22,228,45*75

    Where:
          GSV          Satellites in view
          2            Number of sentences for full data
          1            sentence 1 of 2
          08           Number of satellites in view

          01           Satellite PRN number
          40           Elevation, degrees
          083          Azimuth, degrees
          46           SNR - higher is better
                       for up to 4 satellites per sentence
          *75          the checksum data, always begins with *

Looks like you're only seeing 1 satellite.  Are you in a city or
somewhere else where you'd have a lot of obstructions?

You need line-of-sight with 4 (preferably more) to get a lock.

On Sun, Feb 24, 2008 at 8:38 PM, Ben Wilson <[EMAIL PROTECTED]> wrote:
  
Hi

 My gta01 never gets gps lock,  i've had it outside for over 15min on
 multiple occasions over the past few months with no luck.
 I followed the instructions here
 http://lists.openmoko.org/pipermail/community/2007-November/011916.html
 to get gllin installed
 and i do get the $GPxxx info, it just never locks. (Always A1).

 I get the date on the $GPRMC line which i've been told means the gps
 receiver has found at least one satellite.
 I've tried it on different kernel/rootfs images and i get the same thing.

 Does anybody else have this problem?


 GPS Output
 ---------------
 $GPRMC,005141.53,V,,,,,,,250208,,,N*77
 $GPGSV,1,1,01,19,,,31*72
 $GPGSA,A,1,19,,,,,,,,,,,,11.2,5.0,10.0*3E
 $GPRMC,005142.53,V,,,,,,,250208,,,N*74
 $GPGSA,A,1,19,,,,,,,,,,,,11.2,5.0,10.0*3E
 $GPRMC,005143.56,V,,,,,,,250208,,,N*70
 $GPGSA,A,1,19,,,,,,,,,,,,11.2,5.0,10.0*3E
 $GPGGA,005145.58,,,,,00,00,5.0,,M,0.179099,M,0.07
 $GPGSV,1,1,01,19,,,30*73
 $PGLOR,IGR,81.2,7,71389,0,1*0D
 $GPRMC,005146.52,V,,,,,,,250208,,,N*71
 $GPGSA,A,1,19,,,,,,,,,,,,11.2,5.0,10.0*3E
 $GPRMC,005147.56,V,,,,,,,250208,,,N*74
 $GPGSA,A,1,19,,,,,,,,,,,,11.2,5.0,10.0*3E
 $GPGGA,005149.48,,,,,00,00,5.0,,M,0.179099,M,0.0A
 $GPGSV,1,1,01,19,,,32*71
 $GPGGA,005150.52,,,,,00,00,5.0,,M,0.179099,M,0.09
 $GPRMC,005150.52,V,,,,,,,250208,,,N*76
 $GPGSV,1,1,01,19,,,31*72
 $GPGSA,A,1,19,,,,,,,,,,,,11.2,5.0,10.0*3E
 $GPGGA,005152.54,,,,,00,00,5.0,,M,0.179099,M,0.0D
 ---------------

 Thanks
 Ben.





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