Livewire算法的微弱多普勒信号速度解调方法  

Velocity Demodulation Method for Weak Doppler Signals based on Livewire Algorithm

作　　者：梅迪 何军强 李党娟[1] 周密[2] 吴慎将[1] MEI Di;HE Junqiang;LI Dangjuan;ZHOU Mi;WU Shenjiang(School of Opto electronical Engineering,Xi’an Technological University,Xi’an 710021,China;Shaanxi Applied Physics and Chemistry Research Institute,Xi’an 710061,China;Quality Measurement,Inspection and Testing Center,Keqiao District,Shaoxing 312030,China)

机构地区：[1]西安工业大学光电工程学院,西安710021 [2]陕西应用物理化学研究所,西安710061 [3]绍兴市柯桥区质量计量检验检测中心,绍兴312030

出　　处：《西安工业大学学报》2023年第2期140-147,共8页Journal of Xi’an Technological University

基　　金：国家自然科学基金项目(61701385);国防科技重点实验室基金项目(WDYX21614260204);陕西省高校科协青年人才托举计划项目(20210118)。

摘　　要：为解决光子多普勒测速技术中速度解调方法对微弱多普勒信号表现不佳的问题,采用了一种基于Livewire算法的微弱多普勒信号速度解调方法。该方法对短时傅里叶变换的时频功率谱矩阵进行阈值筛选以提高时频图对比度,之后利用Livewire算法交互式查找差频曲线轮廓提取出差频曲线并计算得出速度信息。实验结果表明:对于高信噪比测试信号,该方法与极最大值法解调结果偏差小于2%。对于微弱多普勒信号,在极最大值法失效的情况下,该方法能准确地从微弱多普勒信号中提取出有效信息,对于微弱PDV信号的解调具有较好鲁棒性。The velocity demodulation method in the Photonic Doppler Velocimetry(PDV)does not perform well for weak Doppler signals.To solve this problem,the paper presents a velocity demodulation method for weak Doppler signals based on Livewire algorithm.By this method,the time frequency power spectrum matrix of short time Fourier transform is filtered by threshold to improve the frequency resolution.Then the time frequency curve is extracted by using Livewire algorithm to interactively find the curve contour with the speed information obtained.The experimental results show that for good test signals,the deviation between the demodulation result obtained by this method and that by the extreme maximum method is less than 2%.If the extreme maximum method fails,the method proposed in this paper can extract effective and accurate information from the weak Doppler signals,having good robustness for the demodulation of the weak PDV signals.

关 键 词：光子多普勒测速 微弱信号 速度解调 轮廓提取 

分 类 号：TN29[电子电信—物理电子学]