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C NMEA-0183 Messages
98 AgGPS 332 GPS Receiver User Guide
C.17PTNLDG Proprietary (Trimble DGPS Receiver
Status)
The PTNLDG message is a Trimble proprietary message for identifying
the DGPS receiver channel strength, channel SNR, channel frequency,
channel bit rate, channel number, channel tracking status, RTCM
source, and channel performance indicator for either beacon DGPS or
satellite DGPS.
The PTNLDG message structure is:
$PTNLDG,87.0,5.2,1558510.0,1200,2,4,1,25,,,*01
Table C.17 describes these fields.
Table C.17 PTNLDG message fields
Field Description
1 Channel signal strength, in 1 dBuV/m. For beacon, this is the
electromagnetic field intensity level. For satellite, this is the ADC
input voltage level.
2 Channel signal to noise (SNR) level, in dB
3 Channel frequency, in kHz
4 Channel bit rate, in bits per second (bps)
5 Channel number, 0–99
6 Channel tracking status
0: Channel idle
1: Wideband FFT search
2: Searching for signal
3: Channel has acquired signal
4: Channel has locked on signal
5: Channel disabled
7 Specified channel is used as RTCM source
0: Not used
1: Used
8 Channel tracking performance indicator. For beacon, this is the
number of errors in the last 255 words. For satellite, this is the time
since last sync, in tenths of seconds ranging from 0–255.