基于最大似然估计的雷达高度计跟踪处理

The Track Processing for Radar Altimeter Based on the Maximum Likelihood Estimate

根据 Brown海面回波模型 ,分析了海面回波中的噪声分布特性 ,即功率谱分别呈指数分布的海面回波噪声和呈均匀分布的热噪声 ,并对此进行了仿真研究。在此基础上对海面回波的最大似然跟踪处理方法进行了分析 ,提出了基于最大似然估计的跟踪器的实现方法 ,介绍了其工作原理、硬件实现方法以及主要工作指标。该跟踪器在校飞实验中获得成功 ,获得了大量实验数据 ;展示了回波波形、跟踪轨迹等校飞数据 。

Radar altimeter(RA) is a kind of active microwave remote sensor,which can measure the distance between the platform and the sea surface,the ocean wave height and the back scattering coefficient.The control system performs an important action in RA,which tracks the return wave and gives the measurement results in real time.\;In this paper,the characteristic of ocean echo is analyzed according to the ocean echo Model of Brown.Either the ocean returen wave noise with an exponential distribution,or the thermal noise with a uniform distribtuion are simulated to discover the statistics characteristic of the return wave form.A new space borne radar altimeter tracker based on maximum likelihood estimate (MLE) is completed,which includes height loop,SWH loop and AGC loop.The perfect haleness and accuracy of the tracker is shown in the flight experiment.The principle,the hardware design and the work specifications of the tracker are present together with some flight experiment data.