基于自然对数似然分解的频域展宽信号能量聚集  

Accumulation of Frequency Broadening Signal Energy Based on Natural Logarithm Likelihood Decomposition

作　　者：路芳[1] 

机构地区：[1]包头师范学院数学科学学院,内蒙古包头014030

出　　处：《科技通报》2014年第12期196-198,共3页Bulletin of Science and Technology

摘　　要：主动声呐自导系统发出的回波信号表现为一种频域展宽信号,对频域展宽信号的准确检测是实现声呐精确探测的技术难题。传统方法中采用分数阶傅立叶变换方法设计检测算法,声呐自导系统径向运动过程中的回波与样本之间的失配导致检测性能下降。利用自然对数变换对线性调频信号的能量聚焦特性,提出一种基于自然对数似然分解的频域展宽信号能量聚集方法,构建主动自导系统回波频域展宽信号模型构建,进行算法改进设计,实现对主动声呐自导系统回波信号的准确检测。仿真实验结果表明,算法能使回波信号在自然对数频域产生明显的能量聚集,提高检测性能,检测概率较传统方法提高明显。The echo signal of active sonar homing system is shown as a frequency domain broadening signal, accurate detec.tion signal is a difficult technical problems. Fractional Fourier transform method is used in the traditional method, mis.matching of the sonar homing system between echo and sample radial motion resulted in low detection performance. Energyfocusing characteristics is used of the natural logarithm transformation to linear FM signals, a frequency-domain broaden.ing signal energy accumulation method is proposed based on the natural logarithm likelihood decomposition, active homingsystem echo system and signal model are constructed, improved design of the algorithm is obtained, accurate detection ofactive sonar homing system echo signal is achieved. Simulation results show that the algorithm can make the echo signalgeneration, obvious energy accumulation in the natural logarithm of frequency domain is obvious, the detection performanceis improved compared with the traditional method, the detection probability is better.

关 键 词：自然对数变换 自导系统 径向速度 检测 

分 类 号：TN978[电子电信—信号与信息处理]