RightWay GPS Navigator RW 430 Betriebsanweisung PDF herunterladen (Seite 89)

GPS RTK Base GPS Receiver User Guide 87

Glossary

Moving Base Moving Base is an RTK positioning technique in which both reference and

rover receivers are mobile. Corrections are sent from a “base” receiver to a

“rover” receiver and the resultant baseline (vector) has centimeter-level

accuracy.

MSAS MTSAT Satellite-Based Augmentation System. A satellite-based

augmentation system (SBAS) that provides a free-to-air differential

correction service for GPS. MSAS is the Japanese equivalent of WAAS, which

is available in the United States.

multipath Interference, similar to ghosts on an analog television screen, that occurs

when GPS signals arrive at an antenna having traversed different paths. The

signal traversing the longer path yields a larger pseudorange estimate and

increases the error. Multiple paths can arise from reflections off the ground

or off structures near the antenna.

NMEA National Marine Electronics Association. NMEA 0183 defines the standard

for interfacing marine electronic navigational devices. This standard defines

a number of 'strings' referred to as NMEA strings that contain navigational

details such as positions. Most Trimble GPS receivers can output positions

as NMEA strings.

OmniSTAR The OmniSTAR HP/XP service allows the use of new generation dual-

frequency receivers with the OmniSTAR service. The HP/XP service does not

rely on local reference stations for its signal, but utilizes a global satellite

monitoring network. Additionally, while most current dual-frequency GPS

systems are accurate to within a meter or so, OmniSTAR with XP is accurate

in 3D to better than 30 cm.

PDOP Position Dilution of Precision. PDOP is a DOP value that indicates the

accuracy of three-dimensional measurements. Other DOP values include

VDOP (vertical DOP) and HDOP (Horizontal Dilution of Precision).

Using a maximum PDOP value is ideal for situations where both vertical and

horizontal precision are important.

postprocessing Postprocessing is the processing of satellite data after it has been collected,

in order to eliminate error. This involves using computer software to

compare data from the rover with data collected at the base station.

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RightWay GPS Navigator RW 430 Betriebsanweisung Seite 89