中文摘要：

地海杂波对采用前视以及下视成像的机载、弹载雷达具有十分重要的影响，对港口成像，会同时受到地杂波和海杂波的影响。文章提出复合场景杂波的后向散射系数模型，推导了复合场景杂波的幅度分布公式，并对由对数正态杂波与韦伯杂波组成的复合杂波分布进行了仿真。仿真中，地海杂波功率比选取了0．001到50之间的一系列典型值，并将不同情况下复合杂波的幅度分布与单一对数正态分布模型和Weibull分布模型得到的杂波分布进行了比较，结果表明二者的复合杂波分布依赖于二者的功率比。

英文摘要：

The land clutter and sea clutter seriously affect the air-borne and missile-borne radar in the forward-looking and down-looking modes. The radar imaging of the target in the port was affected by the clutter from the sea and coastal land. A new backscattering coefficient model of the compound environment is proposed in this paper. The amplitude distribution of composite environment＇s clutter is deduced in the paper. Taking log-normal distribution and Weibull distribution clutter as sample, the composite distribution is simulated. The representative values from 0. 001 to 50 for land-to-sea clutter power ratio in the simulation, and the different amplitude distributions of composite clutter were compared to those from log-normal dis- tributed and Weibull distributed models in different conditions. The results showed that the composite distributions depend on the power ratio of the log-normal distributed and Weibull distributed clutter.