摘要
在诸如潜艇等磁目标的探测问题中,被测磁目标信号可能表现出参数待定的磁异信号或极低频磁信号的特征。提出了一种可同时检测参数待定的微弱磁异信号和微弱极低频磁信号的通用快速检测方法。通过抓住磁异信号和极低频磁信号在统计上共同具有的分段类正弦特征,建立了正弦高斯混合模型,实现了对参数待定的磁异信号和极低频磁信号的通用建模。基于正弦高斯混合模型和序贯检测理论构建了一种累积和检测器,实现了对微弱磁异信号和微弱极低频磁信号的通用快速检测,给出了未知模型参数的确定方法,分析了所构建检测器的序贯检测性能。并进一步研究了所构建检测器对不同的微弱磁异信号和微弱极低频磁信号的检测性能。在以地磁为背景的磁目标探测系统实验中,验证了所构建检测器对微弱磁异信号和微弱极低频磁信号的通用性和快速性。实验表明,所构建检测器的信噪比可低至-8 dB,计算量相比于传统检测方法降低4个量级。
The signal characteristic of a magnetic object,such as a submarine,is indeterminate in the magnetic object detection,which may appear as a magnetic anomaly signal or an extremely low frequency magnetic signal with undetermined coefficients.This paper proposes a universal fast detection method for both the weak magnetic anomaly signal and the weak extremely low frequency magnetic signal with undetermined coefficients.A sine-Gauss mixture model is built based on the piecewise sinusoidal statistical characteristics of the magnetic anomaly signal and extremely low frequency magnetic signal.This universal model can represent both the magnetic anomaly signal and extremely low frequency magnetic signal with undetermined coefficients.A detector is developed based on the sine-Gauss mixture model and the sequential detection theory,which realizes the universal fast detection for both types of signals mentioned above.The unknown parameters in the detector are identified,and the sequential detection performance of the detector is studied.In addition,the detection performance for different weak magnetic anomaly signals and weak extremely low frequency magnetic signals is analyzed.The universality and rapidity of the designed detector for both the weak magnetic anomaly signal and the weak extremely low frequency magnetic signal are verified based on experiment system with geomagnetism.The experimental results indicate that the signal-to-noise rate can be-8 dB,the amount of calculation is reduced by 4 orders compared with the traditional detection methods.
作者
谭博
郭静波
常广
胡铁华
Tan Bo;Guo Jingbo;Chang Guang;Hu Tiehua(Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2019年第2期1-10,共10页
Chinese Journal of Scientific Instrument
基金
国家重点研发计划重大科学仪器设备开发重点专项(2017 YFF0108800)资助
关键词
磁异信号
极低频磁信号
序贯检测
正弦高斯混合模型
通用快速检测
magnetic anomaly signal
extremely low frequency magnetic signal
sequential detection
sine-Gauss mixture model
universal fast detection
作者简介
谭博,分别在2010年和2013年于西安理工大学获得学士学位和硕士学位,现为清华大学博士研究生,主要研究方向为微弱信号检测、目标跟踪与定位;通信作者:郭静波,分别在1983年、1992年和1996年于吉林大学获得学士学位、硕士学位和博士学位,现为清华大学教授、博士生导师,主要研究方向为信号检测与处理、混沌理论及应用、智能电网信息安全与电力通信等。
