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野外目标激光雷达散射截面(LRCS)的测量通常使用比对测量方法。该方法受到测量系统激光光束模式,激光功率稳定性,大气吸收、散射和湍流,背景的激光漫反射回波,系统探测电路噪声等因素的影响。其中,测量系统激光光束模式是最重要的影响因素,造成了比对测量方法中LRCS测量精度难以客观、全面检测的问题。因此,在介绍LRCS的比对测量法及测试系统的基础上,分析了光束模式对系统LRCS测量精度的影响,提出了消光布遮蔽法和光斑分析法相结合的系统LRCS测量精度检测方法。最后,对实际应用中如何减小光斑模式的影响以提高系统LRCS测量精度进行了分析。
Field Target Lidar Cross Section (LRCS) measurements are usually measured using an alignment method. This method is affected by factors such as laser beam mode of the measurement system, laser power stability, atmospheric absorption, scattering and turbulence, background diffuse laser echo, and system detection circuit noise. Among them, the measurement system laser beam mode is the most important factor, resulting in the LRCS measurement accuracy of the measurement method is difficult to objective and comprehensive testing. Therefore, based on the introduction of LRCS alignment measurement and testing system, the influence of beam mode on LRCS measurement accuracy is analyzed. A detection method of LRCS measurement accuracy is proposed based on the combination of light-shielding cloth screening and spot analysis. Finally, how to reduce the effect of speckle pattern in practical application to improve the measuring accuracy of LRCS is analyzed.