核脉冲信号快速提取方法研究  

Research on Fast Extraction Algorithm of Nuclear Pulse Signal

作　　者：吕远向 张江梅[1,2] 王坤朋 冯兴华[1] LYU Yuan-xiang;ZHANG Jiang-mei;WANG Kun-peng;FENG Xing-hua(College of Information Engineering,Southwest University of Science and Technology,Mianyang 621010,China;Southwest University of Science and Technology,Fundamental Science on Nuclear Wastes and Environmental Safety Labratory,Mianyang 621010,China)

机构地区：[1]西南科技大学信息工程学院,四川绵阳621010 [2]西南科技大学,核废物与环境安全国防重点学科实验室,四川绵阳621010

出　　处：《仪表技术与传感器》2019年第11期113-116,121,共5页Instrument Technique and Sensor

基　　金：国家自然科学基金项目(61501385);国防科工局核能研发项目(18ZG6103);四川省应用基础项目(18YYJC1688,2016JY0242)

摘　　要：当存在环境本底噪声以及其他噪声干扰时,传统检测方法难以实现核脉冲信号高精度、高效率检测,提出了一种快速检测核脉冲信号的方法。首先,用自相关检测和滑动窗口相结合的方法构建信号检测器截取有用信号;其次,利用最优方向法对每一段有用信号训练生成相对应的完备字典,获取核脉冲信号的时域信息;最后,利用稀疏分解算法中的匹配追踪算法从每一段信号相对应的完备字典中选择最佳原子重构信号。通过Matlab仿真实验和实测实验验证了所提方法的快速性和有效性。改进的算法能够有效避免追踪算法时间复杂度高的问题,将核脉冲信号的检测效率提高近50倍。Given the existence of noise floor and other noise interference,traditional detection methods are difficult to achieve high-precision and high-efficiency detection of nuclear pulse signals.In this paper,a method which can make nuclear pulse signals quickly detected was proposed.Firstly,a signal detector was constructed to intercept useful signals by combining autocorrelation detection and sliding window.Then,the method of optimized direction was used to train each useful signal so that we are able to build up a corresponding complete dictionary to obtain the time domain information of the nuclear pulse signal.Lastly,the matching pursuit algorithm in the sparse decomposition algorithm was also used to assure the best atomic reconstruction signal selected from the complete dictionary corresponding to each segment of the signal.The paper verified the rapidity and effectiveness of the proposed method through Matlab simulation experiments and experimental tests.The improved algorithm can effectively avoid the high computational complexity of the tracking algorithm and greatly improve the detection efficiency of the nuclear pulse signal by nearly 50 times.

关 键 词：核脉冲信号 信号检测器 自相关 最优方向法 稀疏表示方法 匹配追踪算法 

分 类 号：TL817[核科学技术—核技术及应用]