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讨论了合成孔径声纳的干涉相位图降噪问题。利用加性噪声模型,分析了四种降噪算法:像素平均法、非线性条件邻域均值法、模糊中值法和向量滤波法。通过仿真数据生成的干涉相位图进行降噪分析得到结论:通过像素平均法和条件邻域均值法降噪后不能准确地生成高度图,不推荐在实际中使用。而模糊中值法和向量滤波法通过降噪可以准确地生成高度图。通过相位图残留点数和高度图方差对比发现,向量滤波法性能最优,是一种快速有效的噪声抑制方法。
The problem of noise reduction of the interferometric phase diagram of synthetic aperture sonar is discussed. Using additive noise model, four kinds of noise reduction algorithms are analyzed: pixel average method, non-linear neighborhood method, fuzzy median method and vector filter method. Through the noise reduction analysis of the interference phase diagram generated by the simulation data, it is concluded that the height map can not be accurately generated after noise reduction by the pixel average method and the conditional neighborhood mean method, and is not recommended for practical use. The fuzzy median method and vector filter method can accurately generate the height map by noise reduction. By comparing the residuals of phase diagrams with the variance of height maps, it is found that vector filter has the best performance and is a fast and effective noise suppression method.