波束域相位中心互相关DOA估计方法

为提高多波束测深声呐回波到达角度(DOA)的估计性能,将三排阵测深侧扫声呐的相位中心互相关技术与多波束测深声呐的波束形成技术相结合,提出了一种新的波束域相位中心互相关DOA估计方法;并将该方法与传统相位差测向方法进行了比较,且推导出了两者的数学表达式;通过理论分析和仿真研究指出新方法能同时获得较大的相位非模糊区间和较低的DOA估计误差,有效提高了回波DOA的估计性能;对湖上试验数据的处理结果进一步表明该方法具有工程实际应用的有效性和可行性。

Beam-space phase center cross correlation method for DOA estimation

In order to improve the performance of the direction-of-arrival（DOA） estimation of echo signal for multi-beam bathymetric sonar,this paper combines the phase center cross-correlation technique（PCCCT） employed in three-row bathymetric side-scan sonar with beam forming technique employed in multi-beam bathymetric sonar,and proposes a new beam-space phase center cross correlation method to estimate DOA.The new method is compared with the conventional phase difference method for DOA estimation.Their mathematical formulas are deduced.And the theoretic analysis and the simulation research indicate that the new method can obtain the larger range of phase non-confusion region and the lower DOA estimation error at the same time,and the performance of DOA estimation is effectively improved.The lake test data is illustrated and the results prove that the new method has the practicality and efficiency of practical engineering application.