Rainbow-electronics GE863-GPS low power Manual de usuario descargar pdf (Pagina 118)

GE863-GPS Software User Guide

1vv0300724 Rev. 3 - 05/07/07

5.7.5 Message 106 – Select Datum

GPS receivers perform initial position and velocity calculations using an earth-centered earth-fixed

(ECEF) coordinate system. Results may be converted to an earth model (geoid) defined by the

selected datum. The default datum is WGS 84 (World Geodetic System 1984), which provides a

worldwide common grid system that may be translated into local coordinate systems or map datums.

(Local map datums are a best fit to the local shape of the earth and not valid worldwide.)

The command has the following syntax:

$PSRF106,<Datum>< checksum><CR><LF>

Examples:

1. Datum select TOKYO_MEAN

$PSRF106,178*32

The following table describes the command fields:

Name Example Unit Description

Message ID $PSRF106 PSRF106 protocol header

Datum 178 21=WGS84

178=TOKYO_MEAN

179=TOKYO_JAPAN

180=TOKYO_KOREA

181=TOKYO_OKINAWA

Checksum *32

<CR><LF> End of message termination

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Rainbow-electronics GE863-GPS low power Manual de usuario Pagina 118