用子空间旋转不变法同时估计水下多目标的距离和方位

Simultaneous estimation of time-delay and bearing of multiple underwater reflectors

摘要: 提出了一种可在单次回波内同时完成方位和时延估计的高分辨新方法,它采用于空间旋转不变法(ESPMT方法)的思路构造两个子阵,通过对其自相关矩阵和互相关矩阵的广义特征分解,用特征值估计多目标方位,用特征向量估计多目标时延,利用特征值和特征矢量的对应关系自动实现方位和时延参数的配对.计算机仿真结果表明,该方法的分辨能力、估计精度和正确配对概率都优于常规方法,较好地实现了水下多目标距离和方位的同时估计及配对,进而可对多目标进行定位.

Abstract: In this paper, a new extended ESPRIT method is presented. With a single echo wave, both time delay and DOA parameters of multiple reflectors are estimated simultaneously. No additional pairing algorithm is involved to get the reflector locations. The performance of estimators and the probability of correct pairing is given by computer simulations. It shows that an acceptable result of multiple reflectors location can be obtained in 5~8 dB SNR.