dGPS & WAdGPS
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Principle of dGPS
When a known position is used to obtain a unknown position utilising the same satellites.
- The base station will continually calculate the range to each satellite it can see & compare that range to the Pseudo-Range received.
- It will compare the 2 and determine a Pseudo-Range Correction for each satellite.
The PRC is passed to the ship by the radio wave link.
Has an accuracy to +/-5m
Principle of WAdGPS
Is a form of dGPS where corrections are received from a network of reference stations established over a wide area.
This bring the accuracy down to +/-3m
The corrections are calculated at a central uplink station and are sent to the unit by means of geostationary satellite.
Function of the Fugro Seastar 3100LRS
Provides a position solution using the 5 nearest base stations
Receives the GPS signal via a Trimble Antenna
Receives the PRC via a second Antenna
PRC is then processed
Correct position output to the Online System
Fugro Seastar WAdGPS suite of programs
IOWIN- serial input & output of data
MRdGPS- multi-reference dGPS. Shows all QC data related to selected base station
QCPLOT- monitoring various outputs
ALARM- Issues alarms and warnings
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