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[DPRG] NMEA commands to configure a SiRFstarIII
Subject: [DPRG] NMEA commands to configure a SiRFstarIII
From: Dean Hall
dwhall256 at gmail.com
Date: Tue Mar 25 11:02:13 CDT 2008
No, the GGA and RMC sentences still arrive at 1 Hz. That's the
fastest that my SiRF module allows in NMEA mode. Did I mis-speak/
type somewhere?
My robot has a 5 Hz sensor task and I plan to run the predictor-half
of the Kalman Filter at 5 Hz, but the corrector-half of the KF will
only be run when the NMEA sentence arrives (@ 1 Hz).
!!Dean
On Mar 25, 2008, at 11:10 , dpa wrote:
> Hi Dean,
>
> Very nice. Thanks for the writeup.
>
> So with this arrangement you are getting gps position updates at 5Hz?
>
> dpa
>
>
> !!Dean wrote:
>> I did a quick write-up on how I use SiRF NMEA commands to configure
>> my GPS module to communicate at 19200 baud and only send the 2 NMEA
>> sentence types that I use for GPS data input to my robot. Cutting
>> out the unused sentence types reduces the number of UART receive
>> interrupts by 69%! This helps keep the CPU load down so I have
>> enough processing time for other tasks.
>>
>> http://deanandara.com/Argonaut/Sensors/Gps/
>> ConfiguringSirfStarIII.html
>>
>> Here's where I learned to do all this:
>> http://www.usglobalsat.com/downloads/NMEA_commands.pdf
>>
>> (This information only applies to SiRFstarIII chips)
>>
>> !!Dean
>>
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