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A-34 Acutime 2000 Synchronization Kit User Guide
Trimble Standard Interface Protocol
A
• Minimized Projection - This bit controls the time of the
position fix relative to the time of the satellite range
measurements. The default mode is OFF. In this mode, the
time of solution is the time at which the GPS position fix is
computed. Thus, all measurements are projected by an
interval which is roughly the amount of time it takes to
compute the solution. This approach minimizes the latency
between the time tag of the computed solution and the
solution output. The drawback is that the measurement
projection (which is only about 100 ms) may induce some
error during high accelerations.
Alternatively, when minimized projection is ON, the time of
the solution is the time of the most recent measurements.
Thus, if all measurements are taken at exactly the same time,
there is no measurement projection. If a selected satellite's
measurement time lags the most recent measurement, then it
is projected to this time. The difference is that the fix will
have more latency than a fix provided with the above timing
option. This is the best choice for users performing non real-
time error analysis, or non real-time DGPS solution-space
corrections. This is also the preferable mode for users
integrating GPS with other sensors, where communication
lags are the dominant latencies, and thus the time lag between
the applicability and availability of the fix is small.
Byte 3
Byte 3, the auxiliary byte, controls the output of additional fix data. It
contains two control bits:
• Bit 0 controls the output of raw measurements (Packet 5A).
• Bit 1 controls whether the raw measurements output in
packet 5A are doppler smoothed.