NorthStar 8700, Technical Reference Manual

Page: 68 / 85

Section 10 - NMEA protocols
PAGE 58 05/01/97 REV H
Example P:
$GPGSV,2,1,06,03,12,238,06.0,07,82,008,15.5,11,04,053,,27,43,178,12.3*67<CR>
<LF>
In this example, messages are 2; message number is 1; SV visible is 6; PRN
is 03; elevation is 12
°;
azimuth is 238
°;
SNR is 6 dB; PRN is 07; elevation is
82
°;
azimuth is 8
°;
SNR is 15.5 dB; PRN is 11; elevation is 4
°;
azimuth is
53
°;
SNR is not tracked; PRN is 27; elevation is 43
°;
azimuth is 178
°;
and
SNR is 12.3 dB.
Example Q:
$GPGSV,2,2,06,15,23,187,8.2,17,35,323,11.1,,,,,,,,*4D<CR><LF>
In this example, messages are 2; message number is 2; SV visible is 6; PRN
is 15; elevation is 23
°;
azimuth is 187
°;
SNR is 8.2 dB; PRN is 17; elevation
is 35
°;
azimuth is 323
°;
and SNR is 11.1 dB.
MSS radio-beacon receiver signal status ($GPMSS)
This message sends the information about the SNR and signal strength,
frequency, and bit rate from an MSK (beacon) receiver.
Table 42: MSS radio-beacon signal status sentence
Example R:
$GPMSS,32,13,288.0,100,*68<CR><LF>
Recommended minimum specific GPS data ($GPRMC)
This message provides time, date, position, course, and speed data.
xxx
Azimuth, degrees (azimuth range 000 to 359
degrees)
xx.x
SNR (C/N) 00.0-99.9 dB; null when not tracking
.........
.,xx,xx,x
xx,xx.x
Second, third, and fourth SV
Data field Contents
Data field Contents
$GPMSS,x.x,x.x,x.x,x.x*hh<CR><LF>
SS
Signal strength (SS), dB re: 1uV/m
x.x
SNR, dB
x.x
Radio-beacon frequency, 285.5 - 325.0 kHz
x.x
Beacon bit rate (25, 50, 100, 200) bits per sec