Research On Compensation Technology Of LRCS Field Measurement

The laser radar scattering section(LRCS)is the main information for the detection and identification of the lidar target,There are many factors that affect the measurement of the uncertainty of the laser radar cross section(LRCS),This paper focuses on the full and large-scale target in outfield LRCS measurement error and compensation technology.Based on the theory of LRCS measurement,this paper focuses on the influence of laser emission system parameters,target shape,measurement background noise and atmospheric environment on full and large-scale target in outfield LRCS measurement system.The LRCS emission system is composed of laser power stabilization system,laser pointing stability system and target indication monitoring system.It can meet the output power control in the order of 10-6,and the highest point of the feedback accuracy of <10nm,<10nrad system design requirements.We propose the parameter R,and when the incident beam is a Gaussian spot,we study its effect on the LRCS measurement.We study the change of the detection power when the target / spot value is different,and study the influence of the different shapes of the three typical targets and their different relative positions on the power.We analyzed a variety of homogenization devices,selected homogenized Holoor flattened beam shaper with a cylindrical mirror for beam shaping and homogenization.We propose to adjust the transmission system and receive system spacing and spatial filtering method to reduce the atmospheric backscatter into the receiving system.The combination of the two greatly improves the feasibility and accuracy of LRCS measurements.