Never getting GPS lock

[Lally Singh]

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 <ben at abcom.co.nz> 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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>



-- 
H. Lally Singh
Ph.D. Candidate, Computer Science
Virginia Tech