频谱稀疏OFD-LFM弹头自旋微动特征重构方法

针对基于高分辨雷达技术的弹头自旋微多普勒特征问题展开研究。首先通过理论推导详细分析了OFD-LFM信号体制弹头自旋微多普勒在谱图上的表现形式，并得出相关结论，再结合压缩感知理论提出一种频谱稀疏OFD-LFM微多普勒谱图合成方法，该方法可在大幅减少OFD-LFM子载波数的前提下，准确重构出弹头自旋微多普勒特征曲线；同时有效抑制了谱图中的旁瓣影响。仿真实验结果表明了理论推导的正确性，证明了该文重构方法的有效性。

Reconstruction Method of Spinning Micro Motion Signature of Missile with Sparse Frequency OFD-LFM Signal

Some researches about spinning micro-Doppler signature of ballistic missile are carried out in this paper. Firstly, the format of spinning micro-Doppler signature of ballistic missile on the spectrogram with orthogonal frequency division linear frequency modulation (OFD-LFM) signal is analyzed in details via a strict theoretical deduction, and some related conclusions are obtained. Furthermore, a new micro-Doppler spectrogram synthesizing method with sparse frequency OFD-LFM signal is presented based on compressed sensing. By using the method, the spinning micro-Doppler signature curve can be reconstructed exactly and the side-lobe can be restrained on condition that the sub-frequency number in OFD-LFM signal is reduced apparently. Simulation results show the correctness of theoretical derivation and the effectiveness of the reconstructed method.