Справочник Пользователя для Trimble Outdoors r7-r8
A NMEA-0183 Output
1 7 2 Trimble R7/R8 GPS Receiver User Guide
Tr
imble R7 and R8
A.3
Common Message Elements
Each message contains:
•
A message ID consisting of $GP followed by the message type.
For example, the message ID of the GGA message is $GPGGA.
For example, the message ID of the GGA message is $GPGGA.
•
A comma
•
A number of fields that depend on message type, separated by
commas
commas
•
An asterisk
•
A checksum value
Below is an example of a simple message with a message ID
($GPGGA), followed by 13 fields and checksum value:
($GPGGA), followed by 13 fields and checksum value:
$GPGGA,172814.0,3723.46587704,N,12202.26957864,W,2,6,
1.2,18.893,M,-25.669,M,2.0,0031*4F
1.2,18.893,M,-25.669,M,2.0,0031*4F
A.3.1
Message values
The following values can be found in NMEA messages that the
receiver generates.
receiver generates.
Latitude and Longitude
Latitude is represented as ddmm.mmmm and longitude is represented
as dddmm.mmmm, where:
as dddmm.mmmm, where:
•
dd or ddd is degrees
•
mm.mmmm is minutes and decimal fractions of minutes
Direction
Direction (north, south, east, or west) is represented by a single
character: N, S, E, or W.
character: N, S, E, or W.