修正空时自适应处理在水下自导系统中的应用

摘要

In order to solve the problem of anti-reverberation in shallow water, a modified method of space-time adaptive processing ( STAP) for sonar was proposed. Firstly, the principle of STAP was analyzed according to the echo model of radar. Secondly, comparing the echo model of sonar with radar, the space-time coupling guiding vector was used in space-time processing. Finally, the proposed method was applied in optimization processing and object detection. The simulation results illustrate that the modified method is beneficial to underwater object detection, and the application of space-time coupling guiding vector can increase the accuracy of the direction estimation of targets.%为了将空时自适应处理(STAP)抑制杂波的理论应用于水下环境,从而解决浅水抗混响问题,提出了应用于水下自导系统的修正空时自适应方法.结合雷达目标回波模型分析了空时自适应的原理;比较了雷达和水下自导系统目标回波模型,针对水下自导系统目标模型和混响空-时耦合项对空时自适应方法进行修正,并提出了应用空时耦合导向矢量进行空时处理;将该修正方法用于最优处理和目标检测.仿真结果表明,修正空时自适应方法有利于水下目标检测,应用空-时耦合导向矢量有助于提高目标方位估计能力.