摘要
根据混响散射元空间分布的特点,分析了方位角给定后混响谱展宽程度随距离的变化规律,指出在近距离处混响谱展宽严重。针对混响信号的空时特性,对空时多波束(STMB)处理方法进行了改造和扩展,提出了三维STMB方法,用来进行运动声呐混响的抑制。采用仿真混响数据对提出的算法进行了检验,结果表明,在数倍于海深的检测距离内,三维STMB方法能够取得比STMB和常规方法更好的检测效果。
According to the characteristics of the spatial distribution of the reverberation scatters, the property of the extension degree of the reverberation spectrum with respect to the range is analyzed, if the azimuth is specified. It＇s pointed out that the spectrum extension is severe in the near range. The space-time multiple-beam（STMB） processing approach is modified and extended, and a three dimensional STMB approach is presented to carry out the suppression of the moving sonar reverberation based on the space time characteristics of the reverberation. The presented algorithm is tested by the simulated reverberation, and the results show that the three dimensional STMB approach can achieve better detection performance than STMB and conventional approaches when the range of detection is several times than the sea depth.
出处
《声学学报》
EI
CSCD
北大核心
2008年第2期124-130,共7页
Acta Acustica
