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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。
Aiming at the problems that the existing tracked vehicle micro-motion model does not consider the concrete structure of crawler track, the relationship between radar and vehicle’s space position and the effect of crawler skirt skirting, based on the analysis of tracked vehicle structure, motion characteristics and radar working principle, The improved in-line model provides a more refined representation of the micro-Doppler frequency than the existing models. Through the simulation, we can get the observation signals of the radar echoes, such as the translation of the car body and the fretting generated by the crawler belt and the load roller, using the short-time Fourier transform, the Wigner-Ville distribution, the pseudo Wigner-Ville distribution, the smoothed pseudo Wigner- Time-frequency analysis of the simulation signal by six methods to adapt to the optimal nuclear time-frequency distribution, rearrangement smooth pseudo-Wigner-Ville distribution, compared with Doppler and micro-Doppler effect, from the time-frequency resolution and cross items 2 Compared with different time-frequency analysis methods in the analysis of tracked vehicle micro-Doppler signal performance advantages and disadvantages. Finally, the experimental data are tested. Compared with the traditional and improved simulation results, the correctness of the improved model and the practical observability of the micro-Doppler effect are verified.