海洋背景下雷达测高优化的一种方法

An optimization method of radar height measurement on sea background

雷达辐射波在传播过程中受海面对流层波导效应以及回波多径影响,波导效应导致雷达波束偏离真实位置;多径效应导致雷达阵面端回波幅度、相位矢量叠加,限制了雷达的测高精确度。针对岸基雷达海面方位测高精确度误差大,提出通过反演大气修正参数的方法提高雷达测高精确度。基于目标一次航迹信息、二次雷达高度信息,通过雷达测高公式拟合大气修正参数,将拟合后的大气修正参数代替雷达数据处理测高公式中的原k系数。通过Matlab软件统计海面方位大气参数修正前后雷达测高精确度的变化,实验结果表明,大气参数修正后雷达测高精确度提高了50.8%。

The radar radiation wave is effected by sea tropospheric ducts and echo multipath effect in the propagation,and waveguide effect makes radar beam to deviate from real position. Multipath effect leads to amplitude-phase vector superposition of radar echo on the array,and the height measurement accuracy of radar is limited. Aiming for height measurement error of shore based radar at the sea direction,a method is proposed in which the atmospheric parameters are inverted to improve radar altimeter accuracy. The method is based on the target track information of radar and height information of the Secondary Surveillance Radar, and the atmospheric correction parameters are fitted by the radar altimetry formula,the modified atmospheric parameters instead of the original k coefficient of radar data processor altimetry formula. The Matlab software is utilized to count the variation of radar height measurement accuracy before and after the correction of the atmospheric parameters over the sea direction. The test results show that the radar height measurement accuracy is increased by 50.8% after the atmospheric parameters are corrected.