Lasar Radar Acquisition and Tracking.

摘要

Target acquisition and tracking are crucial to the success of a range-Doppler imaging laser radar. When compared to a conventional microwave radar, the laser radar's very narrow beamwidth increases the difficulty of the both acquiring and tracking the target. This paper deals with some of the issues concerning both passive and active acquisition and tracking of an uncooperative target. Cooperative targets could make use of retro-reflector arrays or beacons to enhance the target. Passive acquisition and tracking is possible provided the signal-to-noise ratio of the target return is large enough. Target detections that are collected over time with a passive detector array can be used to estimate the target's current position or predict the target's angular position at a future time. A least squared error (LSE) criterion is used to fit the observed data to the assumed form (model) of the target's angular trajectory. The model's prediction accuracy is related to the key parameters including the number of detections, the detection times, the detector field of view (FOV) and the prediction time. Waveforms for active range and Doppler acquisition and tracking of the target are presented. Tradeoffs and processing methods for these waveforms are presented. Methods for simultaneous range and Doppler tracking while imaging are also discussed. Reprints. (RRH)