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Acutime 2000 Synchronization Kit User Guide F-7
F Theory of Operation
F.4 Coordinate Systems
This section lists the coordinate system formats supported by the
TSIP and NMEA 0183 protocols.
F.4.1 TSIP
In the default TSIP configuration, position is output in a Latitude-
Longitude-Altitude (LLA) format based on a default datum, WGS-84.
The LLA format can be easily converted by the host system to other
coordinate systems using the appropriate translation algorithm. By
sending the appropriate TSIP command, the smart antenna's position
output can be changed to a Cartesian (XYZ) coordinate format. The
datum used for LLA transformations can also be changed using the
TSIP 8E packet. The smart antenna offers a selection of 179 datums,
which are listed in Appendix A, Trimble Standard Interface Protocol.
The TSIP velocity output format is also three-dimensional. The
default format is X-Y-Z with the option of an East-North-Up (ENU)
coordinate format. Time tags on fix messages default to UTC
(Universal Coordinated Time), but can be switched to GPS time by
sending the appropriate TSIP command.
F.4.2 NMEA 0183
The NMEA 0183 protocol supports only LLA format and UTC time.
If a custom datum is required, it can be set through TSIP using
command 0x8E-15.