非理想条件下LRCS测量误差分析和校正

Analysis and correction of LRCS measurement error under non-ideal conditions

为了减小激光雷达散射截面(LRCS)测量过程中激光能量和大气状态不稳定带来的测量误差,提高LRCS测量准确度,采用基于多个探测单元同时测量的多站对比误差校正方法,推导了一个新的LRCS计算公式,讨论了传统对比方法测量LRCS的适用范围和局限性,分析了在非理想条件下激光器的能量起伏和大气状态的变化对LRCS计算带来的误差,并通过实验对两种方法的测量结果进行了分析比对。结果表明,设计的多站比对测量方法科学可行,采用多站对比公式计算的LRCS值准确度高,可以有效减小或消除测量过程中激光能量和大气状态的不稳定带来的测量误差。

In order to improve the measurement accuracy of laser radar cross section（ LRCS） and to avoid the measurement error of LRCS because of the instability of laser energy and atmospheric conditions,multi-channel comparison measurement method was adopted. New equation and calculation expressions were deduced for LRCS. The applicability and limitation of traditional LRCS measurement were discussed. The influence of laser energy instability and random atmospheric fluctuation on LRCS testing was analyzed. The results of two measurement methods were analyzed and compared. The test shows that the new method is more feasible than the traditional method. The measurement results of LRCS by multi-channel comparison are more accurate and could avoid and decrease the measurement error induced by laser energy instability and random atmospheric fluctuation.