Specifications
162 Z-Family Technical Reference Manual
where n is equal to the number of locked satellites.
Example:
Query: $PASHQ,GSN <enter>
Response: $GPGSN,04,02,46.5,04,48.4,07,50.8,09,51.2,999*7C <enter>
Table 6.94 on page 162 describes each item in a typical GSN message.
Table 6.93: GSN Message Structure
Field Significance Range
d1 Number of SVs locked 0 - 12
d2 PRN number 1 - 32
f3 Signal Strength in DB Hz 30.0 - 60.0
d4 999 to end the message or RTCM age of corrections (if available) 999
*cc Checksum
Table 6.94: Typical GSN Message
Item Significance
$GPGSN Header
04 Number of SVs locked
02 PRN number of the first SV
46.5 Signal to noise of the first SV
04 PRN number of the second SV
48.4 Signal to noise of the second SV
07 PRN number of the third SV
50.8 Signal to noise of the third SV
09 PRN number of the fourth SV
51.2 Signal to noise of the fourth SV
999 Message termination
*7C checksum