水下目标回波亮点高分辨方位估计与仿真

水下目标回波亮点识别技术是现代声纳系统与水声对抗的一个极为重要的组成部分。基于单源方位精估的短脉冲切割方法,对于发射信号为长脉冲以及正横中轴方位下的目标回波亮点方位估计效果较差。因此研究基于多源的水下目标回波亮点高分辨方位估计方法具有重要的应用价值。本文重点研究了水下目标回波亮点高分辨方位估计方法,首先采用基于共轭倒序阵盖氏圆准则的方法对目标回波进行解相干和亮点数估计,然后在此基础上进行目标回波空间谱估计以获得目标亮点的方位。在具体仿真过程中,采用板块元散射方法仿真目标回波,并在此基础上进行高分辨方位估计,取得了较好的仿真效果。结果表明,本文的研究对于正横中轴方位的潜艇目标识别具有一定的应用价值。

High-Resolution DOA Estimation Algorithm for Underwater Target Echo Highlight with Simulation

Underwater target echo highlight identification technology is a very important part for modern sonar system and underwater acoustic countermeasure. However, when transmit signal is long pulse or the sonar system is located at abeam bearing, the estimation algorithm of underwater target echo highlight direction of arrival（DOA） based on sin- gle-source based short pulse split theory is inefficient. Therefore, a multi-source based high-resolution DOA algorithm for underwater target echo highlight is proposed in this paper. The received echo signal is de-correlated and the echo highlight number is estimated by the Gerschgorin radii-based estimator based on the reverse conjugate array, and then the underwater target echo highlight direction is estimated with the space spectrum estimation method. Moreover, un- derwater target echo is simulated with the planar element method for high-resolution DOA estimation. Simulation veri- fies the proposed method is efficient for recognition of suhmarin~ tnrc,~t nt .h~m h~or~.