Spectra Precision SP90m, Руководство пользователя

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• Two GNSS antennas used:
* When the same types of NMEA messages are output on
the same port for the two GNSS antennas, special markers
are inserted into the flow of messages so that the recipient
device can recognize which messages are coming from
which antenna.
For example the output of GGA messages will look like
this:
$PASHD,#1,123456.00,ABCD,BEG*cc<cr><lf>
$GPGGA,…
$PASHD,#1,123456.00,ABCD,END*cc<cr><lf>
$PASHD,#2,123456.00,ABCD,BEG*cc<cr><lf>
$GPGGA,…
$PASHD,#2,123456.00,ABCD,END*cc<cr><lf>
Each NMEA message is inserted between a beginning
(BEG) and end (END) marker (shown in bold characters in
the example above). The marker header indicates for
which antenna the NMEA message that immediately
follows refers to. For example, a GGA message inserted
between two “$PASHD,#1,..” lines means the message is
about the primary antenna. Same for VCR.
Base Data
Messages
You will typically use a base to generate ATOM RNX
messages. RTCM and CMR/CMR+ are also possible options.
Program this output on port D if you are using the internal
radio to broadcast these messages. Use port A, B or F if you
are using an external radio connected to either of these serial
ports.
Program this output on an IP port if your base is broadcasting
its messages over the Internet:
• To an external NTRIP caster
• To the embedded NTRIP caster (see Web Server Online
Help file)
• To an external IP server (receiver in client mode)
• To port I (8888) or J (8889) (receiver in server mode) in
different modes (single or multiple connections).
Output NMEA Message
Heading
HDT
VCT
HPR
Dual RTK* GGA
Dual Relative RTK* VCR