该文在等效散射中心模型下,分析了光滑空间锥体目标进动和章动时回波的微多普勒频率与运动参数的关系.针对目标微多普勒频率的复杂形式,该文提出一种在时频分布(TFD)的基础上,利用多目标跟踪(MTT)技术分离空间锥体目标各等效散射中心微多普勒频率变化曲线的方法.该方法首先应用经典的短时傅里叶变换得到回波的TFD,然后将目标在TFD上的时频曲线看作机动目标的航迹,利用MTT技术跟踪TFD上的时频曲线,从而达到提取目标各等效散射中心微多普勒频率的目的.实验中利用电磁仿真数据验证了提出算法的有效性.%Based on the equivalent scatter center model, the relationship between the micro-Doppler frequencies and the motion parameters of the space cone target with precession or nutation is analyzed. Due to the complicated form of the micro-Doppler frequency mentioned above, an approach to separate the micro-Doppler frequency curve of each equivalent scatter center in the Time Frequency Distribution (TFD) of target echo is proposed in this paper. In this method, classical Short-Time Fourier Transformer (STFT) is first used to obtain the TFD of the target echo; then the Multiple Target Tracking (MTT) algorithm is applied to track the micro-Doppler frequency curves in the TFD, which are assumed to be the tracks of maneuvering targets. Thus the micro-Doppler frequencies of each equivalent scatter center are extracted via the method. In the simulation experiments, the performance of the proposed method is evaluated via the electromagnetic computation simulated data.
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