NavCom Sapphire Rev.J - Manual (Page 303)

Sapphire Technical Reference Manual Rev. J
303
2.58 NMEAGBS (ASCII)
SF-3050 Sapphire SF-3040
Supported Output Rate: OFF ONCE OnChange OnTime
OnChange = when slow nav is completed (1Hz)
OnTime = minimum 1Hz
This output stream reports Receiver Autonomous Integrity Monitoring (RAIM) data. Given that a
GNSS receiver is tracking enough satellites to perform integrity checks of the positioning quality
of the position solution, this sentence reports the output of this process, in compliance with
NMEA 0183 Standards version 3.0. The addition of Fields F9 and F10 bring this message in
compliance with version 4.1 of the NMEA standard.
Table 145: GBS Message Output Format
Output Format: $GPGBS,UTC,Lat,Long,Alt,SVID,Det,Bias,StdDev,*checksum
Field# Field Name Description
F1 UTC UTC time of the associated GGA or GNS fix (hhmmss.ss)
F2 Lat Expected error in latitude (+/-9.9)
F3 Long Expected error in longitude (+/-9.9)
F4 Alt Expected error in altitude (+/-9.9)
F5 SVID ID number of the most likely failed satellite (01-32)
F6 Detection Probability of missed detection (9.9)
F7 Bias Bias estimate on most likely failed satellite (9.9 meters)
F8 StdDev Standard deviation of bias estimate (9.9)
F9 System ID 1 for GPS, 2 for GLONASS (NMEA v4.1 only)
F10
Signal ID Specific frequency likely failed for the given satellite (See
Note 1) (NMEA v4.1 only)
F11 *CRC Checksum
Example: $GPGBS,161816.00,0.0,-0.0,-.0,13,0.8,0.0,0.0*6C

1 The Signal ID is designed to show which Signal failed for that particular satellite.
NavCom receivers show satellites in the GPS constellation using 0, 1, 2, and 4.
GLONASS constellation uses 0, 1, and 3. In the event the receiver is configured
for dual-frequency and multiple signals failed, a 0 is reported. 0 is not used in
single-frequency mode. See the graphic on the next page.