聚焦矩阵在水中宽带目标被动跟踪中的应用

针对水中机动宽带目标,对于设计好的均匀线列阵,采用空间重采样方法计算基阵的恒定束宽阵元权系数,进而利用该阵元权系数产生聚焦矩阵,通过聚焦矩阵将不同频带的子带信号映射到同一参考频率上,然后将所有频率成分的信号功率谱密度矩阵作平均,并结合MUSIC(Multiple Signal Classification)算法,估计出目标的方位信息,从而实现水中宽带目标的被动跟踪。采用该方法进行仿真试验分析,结果表明在小孔径基阵上可实现宽带单目标的稳定测向被动跟踪,且对多目标具有一定的角被动分辨效果。

Application of focusing matrix to underwater broadband passive target tracking

Based on the designed uniform linear array, the passive tracking for underwater broadband targets is conducted as follows： using the spatial resample method for calculating the element weight coefficients of a constant beam-width array to generate a focusing matrix, which maps the sub-band signals of different frequency bands of the broadband signal on the same reference frequencies, then averaging the signal power spectral density matrix of all frequency components and combining with MUSIC algorithm to estimate the orientation information of the target and to realize the passive tracking of underwater broadband target. Simulation of using this method has been done. The result shows that for a single broadband target this method has the stable tracking performance on a small aperture array, and has a certain effect on angle passive distinguish of multi-targets.