基于改进履带式车辆微动模型的雷达微多普勒效应  

Radar Micro-Doppler Effect Based on Improved Micro Motion Model of Track Vehicle

作　　者：贠乐应 吕军[1] 李彤[1] 汪熙[1] 刘磊 

机构地区：[1]装甲兵工程学院信息工程系 [2]63752部队

出　　处：《装甲兵工程学院学报》2017年第4期93-99,共7页Journal of Academy of Armored Force Engineering

摘　　要：针对现有履带式车辆微动模型未考虑履带具体构造、雷达与车辆空间位置关系及履带裙板遮挡效应等问题,在分析履带式车辆结构、运动特性及雷达工作原理的基础上,提出了一种改进的微动模型,与现有模型相比,该模型对微多普勒频率的刻画更加精细。通过仿真得到车体平动和履带、负重轮等微动产生的雷达回波观测信号,使用短时傅里叶变换、Wigner-Ville分布、伪Wigner-Ville分布、平滑伪Wigner-Ville分布、自适应最优核时频分布、重排平滑伪Wigner-Ville分布等6种方法对仿真信号进行时频分析,比较其多普勒及微多普勒效应,从时频分辨率和交叉项2个方面比较不同时频分析方法在分析履带式车辆微多普勒信号时的性能优劣。最后,进行实测数据试验,通过与传统及改进模型仿真结果对比,验证了改进模型的正确性和微多普勒效应的实际可观测性。There are several problems of the current micro-motion model of track vehicle, for example, the specific structure of the track, the relationship between radar and vehicle space position and the crawler effect of the track shoe are ignored. Aiming at these problems, an improved model is established in this paper by analyzing the structure and motion characteristics of track vehicle and the working principle of radar. It is much finer to express micro-Doppler frequency comparing to the existed. In order to analyze the Doppler and micro-Doppler effects of track vehicle, the radar observation signals generated by the translation of body part and micro motion parts are obtained by simulation, time-frequency analysis is carried out to the simulation signal by six different methods, respectively, Short Time Fourier Transform （ STFT）, Wigner-Ville Distribution （ WVD ）, Pseudo Wigner-Ville Distribution （ PWVD ）, Smoothed Pseudo Wigner-Ville Distribution（ SPWVD）, Adaptive Optimal Kernel（AOK） Time-Frequency Distribu- tion and reassignment Smoothed Pseudo Wigner-Ville Distribution. The performance of these methods to analyze micro-Doppler signals of track vehicle is compared in both time-frequency resolution and crossitem size. Finally, the measured data test is carried out, actual observability of the micro-Doppler effect and the correctness of the improved model are verified by comparing with the simulated result of the traditional and improved model.

关 键 词：履带式车辆 微动模型 微多普勒效应 时频分析 雷达回波 

分 类 号：TN95[电子电信—信号与信息处理]