多元阵时间反转镜被动定位技术研究

Passive localization technology of time reversal with multi-sensor array

单水听器和二元阵时间反转镜处理都可以有效实现目标检测和定位,但多元阵时反镜处理的定位精度和水平定位距离远优于单水听器或二元阵定位处理。本文先简述了时间反转镜定位技术的发展和近况,又详细介绍了多元阵时间反转镜定位技术的基本原理,并借鉴乘积阵处理理论利用射线传播模型给出了多元被动时间反转镜定位的算法和公式。仿真和试验数据处理证明,多元阵时反镜处理效果明显优于二元阵时间反转镜处理,即利用阵增益后时反镜性能改善明显。对四元阵海试数据时间反转镜分析处理结果表明:该方法能实现目标被动定位,且对10公里处静止目标其水平定位误差仅为15%。但该方法运算量太大,很难实现实时运算,因此,其工程应用还有许多问题待解决。

The time-reversal technology with single sensor or two-sensor array may be applied to target detection and localization effectively, but the localization distance and precision of multi-sensor array is much better than single sensor＇s. The development and recent situation of the time-reversal technology is presented briefly. The main principle of the time-reversal technology with multi-sensor array is then proved based on the radiate propagation model and multiplicative array principle. Simulation shows that the more sensors be used in TRM, the better the TRM performance. While sea-test data shows that the four-sensor array results in localization precision is 87% with ten kilometer target. The disadvantage of the method is heavy computation burden, which is difficult for real time operation, and, thus limits its practical application.