NavCom Sapphire Rev.J - Manual (Page 335)

Sapphire Technical Reference Manual Rev. J
335
2.78 NMEAPNCTMDE (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 the Marginally Detectable Error (MDE) generated by core nav as part
of the self-monitoring duties performed to support Receiver Autonomous Integrity Monitoring
(RAIM). It is a NavCom proprietary NMEA type message, and it conforms to the header,
checksum and electrical characteristics of a standard NMEA string, but is not recognized by the
NMEA governing body as an officially sanctioned message.
Table 168: MDE Message Output Format
Output Format: $PNCTMDE,hhmmss.ss,s,t,b.b,MM,l.l,g.g,a.a*hh
Field# Field Name Description
F1 Time
UTC time for position fix in hours, minutes, seconds
(hhmmss.ss) (000000.00 to 235959.99)
F2 svid The GNSS svId
F3 Type
Measurement type: 0 = CA, 1 = P1, 2 = L1 , 3 = P2, 4 = L2,
5 = RC CODE, 6 = RC PHASE
F4 bias standardized bias which is noncentrality parameter for w-test
F5 mde MDE in meters
F6 laterr Expected error in latitude (meters)
F7 longerr Expected error in longitude (meters)
F8 alterr Expected error in altitude (meters)
F9 *CRC Checksum
Example: $PNCTMDE,165535.00,,,,,,,*6A