F-8 Acutime 2000 Synchronization Kit User Guide
Theory of Operation F
F.5 Performance Characteristics
This section lists performance information for the Acutime 2000.

F.5.1 Update Rate

The Acutime 2000 updates position at one-second intervals during
self-survey. The surveyed position is frozen after the survey
completes.

F.5.2 Dyn amic Limits

The dynamic operating limits for the various receiver designs are
listed below. These operating limits assume that the smar t antenna is
correctly installed and that the overall system is designed to operate
under the same dynamic conditions.

F.5.3 Re-Acquisition

When a satellite signal is momentarily interrupted during normal
operation, the receiver continues to search for the lost signal at the
satellite's last known Doppler frequency. If the lost signal is not re-
acquired within 15 seconds, the receiver initiates a broader frequency
search. The smart antenna uses the last known information about the
dynamics of the receiver and the satellite to establish the center
frequency and range for the search. Every 15 seconds, until the lost
signal is re-acquired, a new center frequency and search range is
computed. Each frequency range is searched in 500 Hz increments.
The duration of the code search at a given frequency is approximately
one second and switches automatically.
Table F-1 Dynamic Upper Bound
Dynamic Operating Limits
Velocity 500 m/s
Acceleration 4 g (39.2 m/s2)
Jerk 20 m/s3