摘要
在低信噪比下,宽带波束域高分辨方法比宽带阵元域高分辨算法有更优的方位估计性能,但是基于恒定束宽多波束输出的宽带波束域高分辨算法对不等强度目标的分辨能力较差,而在实际声纳系统中所接收的目标强度大多是不相等的。该文提出了一种在低信噪比下不等目标强度的宽带波束域高分辨方位估计新算法,通过调整多波束输出方位来抑制高能量信号,达到分辨不等强度目标的目的,解决了实际系统中不等强度目标源的分辨问题。仿真结果表明,该方法在低信噪比,具有比传统宽带波束域高分辨算法和阵元域高分辨算法更优的不等强度目标分辨性能。
Wideband beam space high - resolution method achieves a better DOA estimation than sensor space wideband high - resolution method in low SNR, but in real SONAR systems, the strength of sources are often different, and beam space high - resolution method is hard to discriminate the sources. In this paper, a new wideband beam space high - resolution DOA estimation method is proposed. This method changes the directions of muhibeams to decrease the energy of high energy source, and it can discriminate different strength sources in low SNR, so it can be well used in real SONAR systems when the strength of sources is different. The computer simulation results show that this method has better DOA estimation than conventional wideband beam space high - resolution method and sensor space high - resolution method.
出处
《计算机仿真》
CSCD
2006年第8期286-288,292,共4页
Computer Simulation
关键词
宽带信号
恒定束宽
波束域
高分辨
方位估计
Wideband signal
Constant beamwidth
Beam space
High - resolution
DOA
