激光测距雷达探测能力的理论评价方法

Theoretical Method for Evaluating the Detecting Capability of Laser Ranging Radar

以激光雷达系统噪声的统计特性为基础,给出了激光雷达系统探测概率和错测率的数学表达形式,分析阈噪比、信噪比以及探测距离对系统探测概率和错测率的影响。提出了以错测率为依据设置最佳阈值电平的方法,同时建立了在设定错测率和探测概率条件下评价激光测距雷达探测能力的理论方法,并运用该方法分析了阳光背景和目标反射特性对激光雷达探测能力的影响。

Mathematical expressions of detecting probability （DP） and error ranging probability （ERP） of laser ranging radar are presented based on the statistic theory of noise in laser radar. Based on those formulas, the influences of the threshold noise ratio （TNR）, signal-noise-rate （SNR） and detection range on the DP and ERP are discussed comprehensively. A method for setting optimum threshold voltage on the basis of ERP and a method for evaluating the detecting capability of laser radar under the condition of the scheduled RP and ERP are proposed in the paper, and the theoretical evaluating method is used to analyze the influences of the sunlight background and the reflected characteristic of targets on the detecting capability of laser radar.