潜标姿态变化对矢量水听器目标方位估计的影响

Influence of attitude changes of subsurface buoy on DOA estimation of vector hydrophone

潜标系统作为一种矢量水听器水下工作安装平台,不可避免的姿态变化会引起矢量水听器各通道接收兴趣信号的起伏变化,致使目标方位估计结果偏离真实目标方向。理论推导分析了潜标体姿态变化对矢量水听器目标方位估计的影响,定量分析了矢量水听器目标方位估计与姿态变化周期(频率)的关系,并进一步讨论了与幅度及积分时间等的关系,如姿态幅度为40°时要方位估计误差小于5°,则积分时间至少要大于24s。研究结果对矢量水听器目标方位估计时的积分时间选取具有重要指导意义。

As a subsea mounting platform of vector hydrophone,subsurface buoy system inevitably suffers attitude changes including rotation,pitch and roll etc.,which results in the variation of interested signals recorded by vector hydrophone and causes the DOA estimation to deviate from the true target direction.This paper deduces and analyzes theoretically the influence on DOA estimation of vector hydrophone due to attitude changes of subsurface buoy firstly.Then it gives quantitatively the relationship between DOA performance and attitude change period （frequency）,amplitude,and integration time.For example,the integration time needs to be more than 24 sec at least if the attitude change amplitude is 40 deg and DOA error is ordered less than 5 deg.These results have important meanings in choosing the integration time for DOA estimation of vector hydrophone.