Trimble Outdoors AcutimeTM2000 Synchronization Kit manual Trimble Standard Interface Protocol

A Trimble Standard Interface Protocol

Alternatively, in the integer second mode, the most recent measurements are projected to next integer second, and the solution is then valid at this time. The benefit of this mode is the standard fix time and a 1 Hz output rate. The drawbacks are that some measurement projection is performed and that the fix may be slightly older than with the default option. This mode also conforms to the output rate of NMEA.

•Output Time - This bit defines whether fixes are automatically output when computed or only sent in response to a packet 37 request. The default is automatic output.

•Synchronized Measurements - This bit controls whether all satellite range measurements are required to have the same time tag. The default is OFF. Slightly older measurements are tolerated (on the order of 3-5 seconds) to provide solutions when obscurations make it impossible to obtain exactly concurrent measurements from each satellite.

When this bit is ON, all measurements are required to have the same time tag. This mode is used only when the user application requires all satellite measurements to be identical to the position time tag. If a satellite that is in the selected set for the solution is lost, then no fix will be made until a new selection is made.

The synchronized measurement mode combined with the minimized projection timing mode (see next paragraph) allows absolutely no measurement projection. However, obscurations may reduce the fix density when there are limited satellites. Use this mode cautiously.

Acutime 2000 Synchronization Kit User Guide A-33