南京大学学报(自然科学版) ›› 2017, Vol. 53 ›› Issue (4): 621.
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安妍妍1,李 赢1,时胜国1,2*,时 洁1,2
An Yanyan1,Li Ying1,Shi Shengguo1,2*,Shi Jie1,2
摘要: 针对水下目标的远程被动探测问题,提出了一种声矢量圆阵的宽带相干目标方位估计方法.首先,基于子带分解原理将宽带划分为若干不重叠窄带,根据圆阵模式空间变换理论,将声矢量圆阵转换成与频率无关的虚拟直线阵,并采用声压P与振速(Vr+Vφ)联合处理方法构建了每个窄带的互协方差矩阵,通过求和平均实现了宽带接收信号的互协方差矩阵估计;其次,引入一种修正的矢量奇异值分解算法,对接收相干信号的互协方差矩阵进行重构处理,用于解决相干声源的空间分辨问题;最后,利用MUSIC算法实现了声矢量圆阵宽带相干目标的方位估计.理论分析及仿真结果表明,修正的矢量奇异值分解算法较修正前具有更强的空间分辨能力;P×(Vr+Vφ)声压振速联合处理方法较同阵型的声压阵及其他声压振速联合处理方法(即(P+Vc)×Vc、P×Vc)具有更好的背景噪声抑制能力;将P×(Vr+Vφ)声压振速联合处理方法与修正的矢量奇异值分解算法有机地结合起来,可提高宽带相干源的方位估计性能.水池实验结果进一步验证了算法的有效性.
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[1] | 李 建1,2,3*,高明生1,2,解 恺4. 线阵阵形畸变对目标方位估计性能影响及校正分析[J]. 南京大学学报(自然科学版), 2015, 51(6): 1195-1202. |
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