Initialization; Accuracy - ashtech Z-Xtreme System Manual

Initialization

The time required for the rover system to perform the initialization process is depen-
dent on the distance from the rover to the base system. The closer the rover system
is to the base, the faster the initialization process will be. As the rover moves further
away from the base system, initialization times will increase. An initialization time of 2
seconds when the rover is 3 km (2 mile) from the base could become 60 seconds or
more when the rover is 10 km (6 miles) from the base.

Accuracy

The accuracy at which the rover system can position is adversely affected as the
base-rover separation increases. The accuracy of the rover system degrades at a
rate of about 1-2 parts-per-million of base-rover separation. This amounts to about an
additional 0.001 m to 0.002 m per kilometer (0.005 ft to 0.010 ft per mile) of positional
error. So for a 10 kilometer (6 mile) base-rover separation, the accuracy of the rover
system will be 0.01 m to 0.02 m (0.03 ft to 0.06 ft) worse than for a base-rover separa-
tion of less than 1 kilometer (0.6 miles).
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