合成孔径声纳干涉相位图噪声抑制方法分析

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。

Noise reduction for interferometric phase images in synthetic aperture sonar

Noise reduction for interferometric phase images in synthetic aperture sonar(SAS) is addressed in this paper.The phase noise is modeled as additive noise.Four filtering algo-rithm are analyzed.They are pixel-averaging,conditional neighborhood-averaging,morphological and mo-dified median filtering,and vector-filtering.Using the interferometric phase images gener-ated with simulated data,it is found that only the morphological and modified median filtering algorithm and the vector-filtering algorithm can produce accurate height maps.By comparison of residues and the height map variance,it is concluded that the vector-filtering algorithm has the best performance.