船载调频连续波声纳测深技术研究  

Research on Frequency Modulated Continuous Wave Bathymetry Sonar

作　　者：张启元 陈莉 刘璞 张烈山 ZHANG Qi-yuan;CHEN Li;LIU Pu;ZHANG Lie-shan(Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学机械与自动控制学院,杭州310018

出　　处：《装备制造技术》2020年第12期12-16,19,共6页Equipment Manufacturing Technology

基　　金：国家自然科学基金(61905220);国家级大学生创新创业训练计划项目(201910338022)。

摘　　要：船载测深装备制造过程中,测深连续性与目标重访率是重要评价指标。针对船载脉冲式主动声纳测深实时性较差、目标重访率低的问题,进行了船载线性调频连续波主动声纳测深技术的研究,通过仿真从理论上证明了技术的可行性,并进行了实验验证。首先由信号调制装置产生线性调频连续波信号,经功率放大器驱动水下超声波发射器发出测量信号进行水下传播,将回波信号与原始信号进行混频与低通滤波,最后利用FFT分析与经验模态分解(EMD)方法提取出主频进而得到测量深度。实验结果表明该技术具有较好的可行性,在实验条件下水深的测量具有很好的重复性与实时性。在调频斜率60 kHz/s的条件下,针对0.4 m^1.2 m的被测水深,测深系统的测量误差的绝对值小于0.15 m,测量的重复性(3σ)优于0.30 m。Sounding continuity and target revisit rate are important evaluation indexes in the manufacturing process of shipboard sounding equipment.Aiming at the problems of poor real-time performance and low target revisit rate of Shipborne pulsed active sonar,the shipborne linear frequency modulation continuous wave(LFMCW)active sonar sounding technology was studied,and the feasibility of the technology was proved through simulation and experimental verification.Firstly,the LFMCW signal is generated by the signal modulation device and the power amplifier drives the underwater ultrasonic transmitter to send out the measurement signal for underwater propagation.The echo signal is mixed with the original signal and low-pass filter is carried out.Finally,the main frequency is extracted by FFT analysis and empirical mode decomposition(EMD)method,and then the measurement depth is calculated.The experimental results show that the technology is feasible,and the measurement of water depth has good coherence and real-time.The relative error of this technology is small and has good ranging accuracy.

关 键 词：船载 调频连续波 主动声纳 混频 经验模态分解 

分 类 号：TB566[交通运输工程—水声工程]