相关测速声呐阵元坐标估计算法研究

针对相关声呐接收阵元实际坐标与设计坐标不一致引起的测速误差,提出阵元坐标估计算法,以提高相关声呐的测速准确度。基于混响时空相关函数模型,对相关测速声呐时空相关函数特性进行了理论分析,提出了选择用延时0处的数据空间相关函数与理论空间相关函数进行阵元坐标估计的局域最小二乘拟合算法,并采用序列二次规划法解决了阵元坐标估计算法的最优化问题。海上试验数据的处理结果表明,该算法可以对阵元坐标进行有效估计,使用估计的阵元坐标后,相关测速声呐测速准确度提高了67%。 

The research of element coordinates estimating algorithm of correlation sonar

An element coordinate estimating method for correlation sonar system is presented, which can be used to improve the performance of velocity estimation. The characteristics of correlation values around the maximum of the amplitude of the correlation function at delay zero are analyzed thoroughly. Localized Least Mean Squares (LLMS) criterion is put forward for element coordinates estimation. Sequential Quadratic Programming (SQP) is adopted as the optimization method. So the systematic signal processing method of correlation sonar for element coordinate estimation is established. The results of experimental data show that the algorithm can be used to accurately estimate element coordinate of correlation sonar. The estimated results help improve velocity measure precision of correlation sonar by 67%.