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Acutime 2000 Synchronization Kit User Guide A-79
A Trimble Standard Interface Protocol
Send packet BB with subcode 0 as the only data byte, to query for the
primary receiver configuration. The receiver will respond with report
packet BB. The table below lists the individual fields within the BB
packet. When sending this packet, enter 0xFF or –1.0 to leave any
parameter unchanged.
Dynamics Code
The default is LAND mode, where the receiver assumes a moderate
dynamic environment. In this case, the satellite search and
re-acquisition routines are optimized for vehicle-type environments.
In SEA mode, the search and re-acquisition routines assume a low
acceleration environment and the receiver reverts to the user-entered
altitude in 2-D auto. In AIR mode, the search and re-acquisition
routines are optimized for high acceleration conditions.
Elevation Mask
This is the minimum elevation angle for satellites to be used in a
solution output by the receiver. Satellites near the horizon are
typically more difficult to track due to signal attenuation, and are also
generally less accurate due to higher variability in the ionospheric and
tropospheric corruption of the signal. When there are no obstructions,
the receiver can generally track a satellite down to near the horizon.
However, when this mask is set too low, the receiver may experience
frequent constellation switching due to low elevation satellites being
obscured.
Table A-68 Vaild GPS Configuration Settings
Survey State Active Configuration Dynamics Code Operating Dimension
Survey Disabled Mobile any any
Survey Active Survey Land/Sea/Air 2D or 3D or Auto
Survey Complete Timing Stationary 1SV or Over-determined