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本文将合成孔径雷达（ＳＡＲ）成象系统视为一个多元接入信息系统，利用信息论分析系统信息的传递。系统平均互信息不仅可以用于度量从雷达图象上提取点目标的信息量，而且还可以用于定义雷达图象的辐射分辨率。在深入分析系统构成的条件下，求出从回波信号的独立取样到输出图象信号间的传递概率密度函数，进而求出系统平均互信息解析表达式，得到一系列结论，研究结果定量地解释和说明了许多已有的结论，并为进一步深入研究打下基础。
In this paper, Synthetic Aperture Radar (SAR) imaging system is regarded as a multiple access information system, which uses information theory to analyze the transmission of system information. The system average mutual information can not only be used to measure the amount of information extracted from point images of radar images, but also can be used to define the radiation resolution of radar images. Under the condition of deeply analyzing the system constitution, the transfer probability density function from the independent sampling of the echo signal to the output image signal is obtained, then the analytical expression of the average mutual information of the system is obtained, and a series of conclusions are obtained. The results of the study quantitatively Explain and explain many of the existing conclusions and lay the foundation for further research.