[DSP-10] A Clock Question

[kd7ts]

this is a sample from 5.6.1.3, table 5-47 GGA messages

$GPGGA,222435,3339.7334,N,11751.7598,W,2,06,1.33,27.0,M,-34.4,M,7,0000*41

from the "Designers Guide of the Zodiac Family" for the Conexant GPS engines.

It appears identical in form and fields with the NMEA-0183 spec.

73 Mike KD7TS


Bob Larkin wrote:
> Hi Mike,
> 
> Is the relationship between the NMEA GGA sentence and the actual GPS 
> time fixed?  If so, it can be handled by the current implementation. 
> This allows for an offset between the end of GGA sentence and the 1PPS 
> pulse timing.  The current software keys on GGA for minutes and seconds, 
> but also reads GSV when they are available and summarizes that data.  
> GSV can come anytime, and the latest are used.
> 
> Rockwell binary would fit into the current scheme, but if NMEA works, 
> that is easier, as it i there. The UT+ runs in binary.
> 
>  Also, page 8 of your freq reference paper:
> http://mysite.verizon.net/n1jez/osc/A%20Simple%20GPS%20Stabilized%2010%20MHz%20Oscillator.pdf 
> 
> shows the NMEA strings without an ending asterisk and check sum. I 
> assume these are there in real life?