基于相位估计和线性拟合的运动补偿方法

Research on Motion Compensation Based on Phase Estimation and Linear Fitting

结合基于无人水下航行器(UUV)小型拖线阵的应用,针对常规扩展拖曳阵测量方法(ETAM)在阵列存在运动误差时算法性能有所下降,提出一种运动误差估计与相位校正法。在阵形保持直线阵的前提下,采用最小二乘算法对相邻两次测量中位置重叠阵元相位相关因子进行线性拟合,根据拟合出的关系式对阵列输出数据进行相位补偿,从而有效克服线列阵的偏航带来的相位误差。在阵列偏航3°和5°时,仿真结果表明新算法的方位分辨性能有所提高。

As the conventional ETAM algorithm performance degenerates in presence of motion error and considering the application of the miniature towed linear array to Unmanned Undersea Vehicle（UUV）,a new method of the motion error estimation and phase modifying is proposed.Based on the precondition that the array shape is kept linear,we calculate the phase correction factors by correlating overlapping space samples of the acoustic signal received at successive moments of the moving towed array,and we fit the perform straight-line operations with the phase correction factors and obtain the fitting formula.Then we carry through the phase compensation operation for the acoustic signal received according to the formula,in order to conquer the phase error brought by the array＇s yaw effectively.When the yaw angle is 3° 5°,the simulation analysis results indicate that the angular resolution has been improved.