波束域ETAM算法在无人水下航行器中的应用

Application Research on Beam Space ETAM for Unmanned Undersea Vehicle

线列阵的方位分辨率受阵列孔径所限制;结合基于UUV(Unmanned Undersea Vehicle)小型拖线阵的应用,针对时域ETAM方法在等强度多源检测时性能下降的问题,提出采用波束域ETAM方法进行被动孔径合成处理;在满足时空相关特性前提下,该方法利用目标噪声中的低频线谱成分,根据时间处理增益转换为空间处理增益思想,通过时间补偿,对阵列孔径进行扩展,从而达到获得高动态空间增益、显著改善目标方位分辨力的目的;分析结果表明,该算法具有很好的多源检测性能,而且进一步验证了其高分辨特性,在UUV平台上具有很高的应用价值。

The direction-of-arrival resolution of linear array depends on array aperture.Considering the application of miniature towed linear array using on UUV,as the temporal domain ETAM breaks down in presence of multiple equal intensity sources,the beam space ETAM algorithm is proposed to realize the passive acoustic synthesis aperture.Based on the idea translating the temporal process gain into spatial process gain,the method utilizes the low-frequency line-spectrum in target noise and synthesizes the aperture through time compensation on condition that the sound field satisfies temporal and spatial correlation characteristic.The method obtains high dynamic spatial gain and improves the direction-of-arrival resolution distinctly.Analysis results indicate that the method proposed has better performance for multi-source detection and validates its quality of high-resolution furtherly.The method has significant application value for UUV platform.