NMEA Commands 245
NMEA Commands
Table 8.17 outlines the response message.
GST: Pseudo-Range Error Statistics
$PASHS,NME,GST,x,c,[f]
Enables/disables the GST message where x is the serial port, c is ON or OFF, and
f is the optional message output rate ranging from 0.05 to 999 seconds depending
on the measurement update rate option installed.
The GST message provides a real time estimate (1 sigma) of the position error.
The receiver does not output this message if a position is not computed.
Table 8.17. Typical GSN Message
Field Description
$GPGSN Header
07 Number of satellites currently locked
01 PRN number of the first satellite
048 Signal strength of the first satellite
29 PRN number of the second satellite
046 Signal strength of the second satellite
25 PRN number of the third satellite
048 Signal strength of the third satellite
08 PRN number of the fourth satellite
040 Signal strength of the fourth satellite
31 PRN number of the fifth satellite
037 Signal strength of the fifth satellite
15 PRN number of the sixth satellite
048 Signal strength of the sixth satellite
21 PRN number of the seventh satellite
046 Signal strength of the seventh satellite
999 Indicates that the DG16 is unable to
receive differential corrections or
differential GPS is disabled
*4F Checksum
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