基于天底点的散射回波信号处理算法

A Scatter Echo Processing Algorithm Based on Nadir Point

针对基于速度选通雷达高度表在森林等纯散射地面无法工作的问题,在深入分析纯散射地面回波信号模型及回波功率分布特征的基础上,提出了基于天底点的散射回波信号处理算法。该算法通过检测天底点附近回波中的多普勒和相位信息,进行相应补偿后获取回波中的二相编码信息,对所得二相编码信号进行相关处理后通过检测其峰值实现高度测量。仿真结果表明,该算法能够有效解决雷达高度表在森林等纯散射地面无法工作问题。

The radar altimeter based on speed gate can not work on the ground in forest and pure scattering ground.Aiming at this problem,the scatter echo model and the characteristic on the power distribution of the scatter echo signal is analyzed deeply.The scatter echo signal processing algorithms based on the nadir point is presented.In the algorithm,the height information is measured through detecting the peak value of the relevant of the biphase-coded signal which is acquired from the scatter echo signal.The simulation results show that using the algorithm,the radar altimeter radar can successfully work on the pure scattering ground.