利用波导不变量进行运动单线阵的无源测距测速

为克服单线阵难以无源测距、测速的缺点,提出了利用目标辐射低频声场干涉结构和波导不变量的运动单线阵无源测距、测速方法。定义了运动目标的距离距变率比（目标距离与距离变化率的比值）,并利用与目标辐射声场的时间-频率干涉结构和波导不变量相关的变量来表征距离距变率比。根据此定义,通过对目标辐射声场的时间-频率干涉结构图进行Radon变换等处理,实现对距离距变率比的估计。利用所估计的距离距变率比,结合平台速度、目标方位角和目标航向角实现对目标距离和速度的同时估计。仿真实验验证了所提方法在测距、测速时的正确性和有效性。结果表明:所提方法在目标航向角较大时有较高的距离、速度估计精度;同时,目标方位估计误差越小,所提方法的距离、速度估计精度越高。 

Passive ranging and velocity estimation using a moving hydrophone array based on the wave guide invariant

A passive ranging and velocity estimation method, using the sound field interference characteristic, the waveguide invariant and a single moving hydrophone array, is proposed. A variant of a moving target, termed as the ratio of the range to the range varying rate(RRRVR), is defined, which is dependent on the sound field interference characteristic and the waveguide invariant. Accordingly, by using the Radon transform, RRRVR is estimated from the time-frequency interference image of the target sound field. And finally, the target range and velocity are estimated from RRRVR, the moving speed of the array platform, the target angle and the target heading angle. Numerical simulations are given to demonstrate the correctness and the effectiveness of the proposed method. The results show that the accuracy of the proposed method on the passive range and velocity estimation is at a high level when the target heading angle is relatively large; and a smaller target bearing estimation error ensures a higher ranging and velocity estimation accuracy.