时频分析在变加速运动目标速度测量的应用  

Application of Time-frequency Analysis to Velocity Measurement of Varying Accelerated Moving Target

作　　者：姚金杰[1] 韩焱[1] 

机构地区：[1]中北大学电子测试技术国家重点实验室,太原030051

出　　处：《火力与指挥控制》2011年第5期133-135,139,共4页Fire Control & Command Control

基　　金：山西省自然科学基金资助项目(2007012003)

摘　　要：针对多普勒频率非线性连续变化的变加速运动目标,提出了基于短时傅立叶变换和魏格纳-维尔分布的速度测量方法,并根据其数学原理,利用毫米波测速雷达设计了运动目标的速度测量方案。信号仿真表明,低频段W igner-V ille法更能够反映目标的微小速度变化,高频段STFT时频处理精度更高且测速精度能达到0.5%。实验采集数据处理进一步验证:这两种时频分析方法都能够用于高速且变加速运动目标的速度信号分析处理。A method of velocity measurement based on short time Fourier transform and Wigner-Ville distribution is presented in view of the varying accelerated moving target which Doppler frequency variety is nonlinear.According to the principle,a scheme of velocity measurement of moving target is designed via millimeter wave radar.The simulation results indicate that the method of Wigner-Ville can reflect the mini-change of the target velocity in the low frequency,and the method of STFT can achieve higher measuring accuracy in the high frequency which is up to 0.5%.The data processing in experiment further validates that the time-frequency analysis methods of STFT and Wigner-Ville distribution can be used to velocity signals processing of moving targets which have high velocity and varying acceleration.

关 键 词：时频分析 短时傅立叶变换 魏格纳-维尔分布 毫米波雷达 速度测量 

分 类 号：TJ012.16[兵器科学与技术—兵器发射理论与技术]