Teledyne MB1, Руководство по оборудованию, Страница: 15 / 37

MB1
User Manual
Page 15 of 37
7/6/12
3.2.2.3 GPS I/O
This RS232 connector is used to interface the positioning device into the RTA. The 3 messages to be
used are NMEA ZDA, GGA and VTG at rates of 1-5 Hz.
The formats of the standard NMEA sentences are as follows:
GGA
$GPGGA,hhmmss.ss,llll.ll,a,yyyyy.yy,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx*hh
1 Header
2
Time in UTC (hours, minutes, seconds and decimal seconds)
3 Latitude
4
N or S
5 Longitude
6
E or W
7 GPS quality indicator (0=invalid; 1=GPS fix; 2=Diff. GPS fix)
8 Number of satellites used for fix
9 HDOP
10
Antenna Altitude above Geoid
11 Antenna Height unit
12 Geoidal separation
13 Geoidal separation unit
14 Age in seconds since last update from differential reference station
15 Differential reference station identification number
16 Checksum
ZDA
$GPZDA,hhmmss.ss,dd,mm,yyyy,xx,xx
1 Header
2
Time in UTC (hours, minutes, seconds and decimal seconds)
3 Day of the Month
4 Month of the Year
5 Year
6
Local Time Zone (Hours)
7 Local Time Zone (Minutes)
VTG
$GPVTG,t,T,,,s.ss,N,s.ss,K*hh
1 Header
2
Track made good
3 Fixed 'T' means track is relative to true north
4 Not used
5 Not used
6 Speed over ground in Knots
7 Fixed 'N' means speed over ground is in Knots
8 Speed over ground in KM/H
9 Fixed 'K' means speed over ground is in KM/H
10 Checksum
PPS may also be input to the RTA via pin 9 of this connector (default setting) or by pin 8 of the connector.
To use pin 8, see the instructions in paragraph 3.2.2.2 to enable this feature.
The GPS I/O port is also used to interface with an internal H320 GPS board (if fitted).