激光雷达的目标检测性能分析

讨论了激光雷达的单脉冲检测和多脉冲相关检测。在杂波背景下,单脉冲检测虚警概率较高,适宜工作在大信噪比条件下;多脉冲相关检测,根据目标的相关性,经过多次相关,可以提高检测概率,减小虚警概率,适宜于对弱小信号进行检测。但是,多脉冲相关检测以牺牲捕获目标时间换取高检测概率,相关次数多,捕获目标所用时间长,影响激光雷达对运动目标的迎头截获能力。在实际应用中,合理选取脉冲相关个数和门限是多脉冲相关检测的关键。

Performance analysis of target detection in a laser radar

The single pulse detection algorithm and the multi-pulse correlation detection algorithm are discussed. In the presence of clutter , the single pulse detection algorithm has a high false alarm probability, so it is effective only in the case of great signal-to-noise ratio (SNR). The multi-pulse correlation detection algorithm, on the basis of the correlation information of the target, can improve the detection probability and decrease the false alarm probability, so it is useful for the detection of a weak signal. On the other hand, the pulse-correlation detection algorithm achieves a high detection probability at the expense of the capture time, with more correlation times and longer time to capture the target, which will weaken the head-on intercept ability of laser radar. In practice, it is the key to select appropriate correlation times and appropriate threshold.