一种基于分段DPC和拟合的合成孔径声呐运动补偿方法
doi: 10.3724/SP.J.1146.2012.01096
A Motion Compensation Method for Synthetic Aperture Sonar Based on Segment Displaced Phases Center Algorithm and Errors Fitting
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摘要: 为了解决大测绘带条件下合成孔径声呐的运动误差在斜距向上的空变性会影响运动补偿效果的问题，该文提出了一种基于分段的偏移相位中心(Displaced Phase Center, DPC)算法和拟合的运动误差估计及补偿方法。该方法首先对原始回波数据在斜距向上进行分段，利用DPC算法估计各个子段的斜距运动误差，其后利用最小二乘方法对声呐运动的横荡误差和升沉误差进行估计，最后对不同斜距上的原始回波数据做逐点非均匀运动补偿处理。仿真和湖试数据处理结果证明了该方法的有效性。
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关键词:
- 合成孔径声呐 /
- 运动补偿 /
- 分段偏移相位中心方法 /
- 拟合
Abstract: To solve the problem that the Synthetic Aperture Sonar (SAS) motion errors distinct variety in large slant range may reduce the imaging resolution, this paper proposes an improved motion error fitting and compensation method based on segment Displaced Phase Center (DPC) algorithm and motion errors fitting. Firstly the raw data are segmented in slant range and each segments motion error is estimated using the DPC algorithm. Then the sway and heave are estimated using the Least-Square (LS) estimation method. Finally, the raw data are compensated point by point in slant range with the estimated sway and heave. The proposed algorithm is applied to the simulated data and lake-trial dataset, and the result confirms that the proposed method improves the SAS imaging resolution. -
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