User's Manual

SPSx50 Modular GPS Receiver User Guide 65
Setting up the Receiver 5
– Minimum Heading Solution. Enter the minimum requirement for the GPS
solution that will provide the heading value. The default of RTK Fixed
provides the highest precision, but in conditions of extreme multipath or
obstruction, an RTK Fixed solution may not be continuously available. In
such conditions, select RTK Float if a lower precision is acceptable.
To set up the Moving Base unit:
1. From the Home screen press <enter><enter>. The Mode screen appears.
2. Select Moving Base mode.
Interfacing using the NMEA protocol
The SPS550H GPS receiver can output messages such as NMEA HDT for heading, and
NMEA GGA for position. The SPS550H always reports the solution status of the
moving baseline solution that is being used to compute the heading. For example,
Modem (serial port 2) on SPS750, which is typically RTK Fixed Integer. However, if the
external computer must know the exact quality of the position, you can use the NMEA
output from the base receiver. The base receiver reports the solution status of the
position, for example, Fixed Integer, Floating, orDGPS.