基于多级频谱分析和能熵比的应答器系统设计  

Design of Transponder System Based on Multi-level Spectrum Analysis and Energy Entropy Ratio

作　　者：王雷 马朝飞 张舒皓 高嘉淇 WANG Lei;MA Chaofei;ZHANG Shuhao;GAO Jiaqi(College of Electrical and Information Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2023年第4期147-154,共8页Journal of Hunan University:Natural Sciences

基　　金：湖南省自然科学基金资助项目(2022JJ10013);湖南省湖湘青年科技创新人才资助项目(2021RC3059)。

摘　　要：为解决传统应答器系统在模拟不同距离水下目标时易受强噪声干扰及转发时延精度不高的问题,提出一种粗-细两级波达时刻估计方法并开发一套高精度时延的可靠应答器系统.该系统主要由以信号采集、信号处理为主的上位机和以功率放大器、换能器为主的下位机组成.其中上位机利用多级频谱分析及其峰均比大于设定门限进行粗估计,初步获取信号的波头;再利用基于能熵比的双门限检测算法进行细估计,获得更精准的波达时刻,进而解决了时延不准的问题;最后,系统下位机通过TCP接收上位机传输的应答信号并在预定时刻应答回波信号.湖试结果显示,该系统的时延误差小于40 ms,具有高精度的转发时延优势,并且在强噪声干扰下具有良好的鲁棒性.To solve the problem that the traditional transponder systems are susceptible to strong-noise interference and the transmission delay accuracy is not high when simulating underwater targets at different distances,a coarse-fine two-stage arrival time estimation method is proposed,and a reliable transponder system with high precision delay is developed.The system is mainly composed of the upper system,which collects and processes signals,and the lower system,which amplifies and transducers.The upper system uses multistage spectrum analysis,and its peak ratio is greater than the set threshold for rough estimation,and the signal wave headis preliminarily obtained.Then,the double threshold detection algorithm based on the energy entropy ratio is used toacquire a more accurate arrival time by fine estimation.The problem of inaccurate delay is solved.Finally,the lower system receives the response signal transmitted by the upper computer through TCP and responds to the echo signal at a predetermined time.Lake trails show that the delay error of the system is less than 40 ms,and the system has the advantage of high-precision forwarding delay and has good robustness under strong-noiseinterference.

关 键 词：水声应答器 短时分析 信号特征 短时能熵比 端点检测 

分 类 号：TN955.2[电子电信—信号与信息处理]