便携式空中目标仪激光重频的分析

Laser Frequency Repetition Times in Portable Aerial Target Measurement

针对目标仪中激光重频次数的确定问题,对实际航迹数据进行分析.首先计算实际航迹信号的功率谱密度,得到航迹的频谱范围,依据Shannon定理初步确定激光重频值.进一步从建立航路的的预测误差要求出发,在匀速直线运动的假设下,使用该激光重频值,激光测距的预测误差方差能达到工程要求.然后给出该方差和建立航路允许的最大漏测点分布规律的对应关系.理论分析和工程实际表明,在保证跟踪精度的情况下,该激光重频值将满足回波率的技术指标要求.

The problem of laser flight path data, power spectral frequency repetition （LFRi times in target distance measurement is studied. In analyzing density is computed to obtain the frequency range and times of LFR using the Shannon theorem. Under the assumption of line movement with constant velocity, the flight path is built such that prediction error variance computed by the LFR times meets the specified requirements. Relation between error variance and the maximum allowed number of missing measurements is presented. It is proved both in theory and from practice that the LFR times can meet the performance specifications of laser echo rate while guaranteeing the tracking precision.