自然科学版
陕西师范大学学报(自然科学版)
全国声学大会专题
连续波主动声呐的矩阵信息几何目标检测
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周泽民,华小强,关承宇,曾新吾*
(国防科技大学 气象海洋学院, 湖南 长沙 410073)
周泽民,男,助理研究员,博士,主要研究方向为水声信号处理。E-mail: zzm@nudt.edu.cn;曾新吾,男,教授,博士生导师,研究方向为水声物理。E-mail:xinwuzeng@nudt.edu.cn
摘要:
海洋混响是主动声呐的主要干扰之一。由于混响与目标回波信号的强相关性,在强混响背景下,传统的匹配处理会出现严重的虚警。因此,减少混响对弱目标探测的影响,是混响背景下主动声呐需解决的关键问题。针对低信混比条件下主动声呐探测的恒虚警检测问题,以矩阵信息几何理论为基础,利用连续波主动声呐回波构建了对应距离单元的信号矩阵流形,在此基础上提出了连续波主动声呐的矩阵信息几何目标检测方法。通过混响统计模型和双基地混响单元散射模型下的仿真数据处理结果表明,在低信混比条件下矩阵CFAR(constant false alarm rate)检测器相比于常规的FFT-CFAR检测器具有更优的恒虚警检测性能。
关键词:
信息几何;连续波主动声呐;恒虚警检测;K-L散度
收稿日期:
2019-09-30
中图分类号:
TB566
文献标识码:
A
文章编号:
1672-4291(2019)06-0023-07
基金项目:
国防科大科研计划项目(JC15-11-01);国防科技基金(3101287)
Doi:
Target detection based on matrix information geometry for continuous active sonar
ZHOU Zemin, HUA Xiaoqiang, GUAN Chengyu, ZENG Xinwu*
(College of Meteorology and Oceanology, National University of Defense Technology, Changsha 410073, Hunan, China)
Abstract:
Reverberation is an important interference. Due to the strong correlation between reverberation and transmitted signals, the traditional match processing usually causes severe false alarm. Therefore,it is crucial for signal detection in active sonar to suppress reverberation and decrease the false alarm.Aiming at the problem of constant false rate detection in low signal-to-reverberation ratio (SRR), in this paper, the idea of constructing signal matrix manifold corresponding to distant by using the echo of continuous active sonar is introduced based on the matrix information geometry theory. On this basis, the target detection based on matrix information geometry for continuous active sonar is proposed. The simulation results are based on reverberation statistical model and bistatic reverberation cell scattering model. It is shown that the matrix constant false alarm rate (CFAR) detector is better that of the traditional FFT-CFAR detector under low SRR.
KeyWords:
information geometry; continuous active sonar; constant false alarm rate detection; Kullback-Leibler divergence