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Erschienen in:
2012 | OriginalPaper | Buchkapitel
5. Loss of Lock in Phase Trackers
verfasst von : Zeev Schuss
Erschienen in: Nonlinear Filtering and Optimal Phase Tracking
Verlag: Springer US
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Abstract
The trackers of phase, frequency, angle, range, and other parameters are notorious for their tendency to lose their lock on the tracked signal. Phase is usually defined mod 2π, so a noise-induced jump of 2π in the tracked phase, a so-called cycle slip, causes only a short-lived disturbance (see Figure 5.3). If cycle slips occur frequently, as is the case in PLLs for tracking FM signals, the signal is lost altogether and a sharp degradation in the tracking-loop performance ensues. In range or angle tracking (radar), once the tracking error exceeds a certain threshold, the lock detector indicates that the target is lost and has to be reacquired. In certain synchronization systems losses of lock are catastrophic and have to be made rare. Therefore the mean time between losses of lock (MTLL) is an important performance criterion for trackers.