自适应波束域高分辨方位估计新方法

Adaptive Beam Space High-resolution DOA Estimation

提出了基于均匀线列阵的自适应波束域MUSIC(ABMUSIC)法,它利用原有多波束系统的输出估计目标的分布区间,根据目标的空间分布情况自适应形成波束转换矩阵,并让形成的空间波束的主瓣覆盖目标所在的空间区域。ABMUSIC法形成的波束不仅能随目标的空间分布自适应调整波束的指向性和密集度,而且只在目标分布的空间区域形成波束,提高了信噪比。进行了相干和不相干情况下的性能仿真比较,结果表明:在相干和不相干情况下,ABMUSIC方法的高分辨估计性能都明显优于BMUSIC和MUSIC,并且不增加运算量,具有重大工程应用价值。

Aiming at the limitation of beam space MUSIC （BMUSIC） estimation in engineering application, a novel adaptive beam space MUSIC （ABMUSIC） estimation was proposed, which firstly estimated targets distribution with the beam-forming system, then formed the beams adaptively and let their main lobes covered with the targets apparent azimuth. The formed beam-space of ABMUSIC could adjust the beam-point and beam density adaptively based on the targets apparent azimuth estimation, which improved the Signal-to-Nolse. Performance comparing under correlation and uncorrelation conditions was proposed. Simulation results show that the ABMUSIC performs better than MUSIC and BMUSIC, especially in low SNR, and doesn＇t increase the computation, and is sufficiently satisfactory for high-resolution engineering applications.