CAJ | 학술논문

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.
위료해결대측회대조건하합성공경성눌적운동오차재사거향상적공변성회영향운동보상효과적문제,해문제출료일충기우분단적편이상위중심(Displaced Phase Center, DPC)산법화의합적운동오차고계급보상방법.해방법수선대원시회파수거재사거향상진행분단,이용DPC산법고계각개자단적사거운동오차,기후이용최소이승방법대성눌운동적횡탕오차화승침오차진행고계,최후대불동사거상적원시회파수거주축점비균균운동보상처리.방진화호시수거처리결과증명료해방법적유효성.
@@@@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 segment’s 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.