Trimble Inc. 5580090 사용자 설명서
5 Setting up the Receiver
58 SPSx50 Modular GPS Receiver User Guide
2.
Select Heading mode. The SPSx50 display shows two extra settings for heading:
–
Heading Adjustment. Enter a positive value in decimal degrees. The value is
applied to the raw heading value before it is output in the NMEA HDT
message or displayed on the front panel of the receiver. This value is used
when the two antennas are not mounted parallel to the vessel axis.
applied to the raw heading value before it is output in the NMEA HDT
message or displayed on the front panel of the receiver. This value is used
when the two antennas are not mounted parallel to the vessel axis.
–
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.
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
L
twice. 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, the
Modem (serial port 2) on the 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, or DGPS.
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, the
Modem (serial port 2) on the 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, or DGPS.