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与普通光学成像相比,合成孔径雷达(SAR)成像拥有很多优良特性,使得SAR在各个领域得到广泛的应用.但星载或机载SAR图像数据量非常庞大,对图像的传输能力和存储空间提出了很高的要求,如何对其进行有效地压缩成为实际应用中至关重要的问题.该文通过对小波系数直接舍高压缩方法和默认阈值压缩方法的分析研究,在此基础上给出了一种基于小波变换的图像混合编码方法,并将此方法应用于SAR图像的压缩,实现了高压缩比下较高保真度的处理效果.“,”The synthetic aperture radar imaging which has emerged many special characters in contrast to the ordinary optic imaging,is widely used in many domains increasingly. However,the SAR image which be created in airplane or satellite is so large that it is inconvenient to transmit and store,thus how to compress the SAR image efficiently becomes a very important problem in the practical application. Through studying and analyzing the method of cutting HF and default threshold coding on wavelet coefficients ,this paper present a image mixed coding based on wavelet transform,and applies it to the coding of SAR image,which achieves high compression ratio and fidelity in result.