前视阵频率分集雷达空时杂波特性研究

Study on Space-time Character of Clutter for Forward-looking Frequency Diverse Array Radar

针对前视阵频率分集雷达,该文在其空时信号模型的基础上,详细分析了其杂波谱空时2维展宽特性和相位距离走动特性。杂波谱展宽特性表现为杂波谱时域和空域展宽,当步进频率较小并且阵元脉冲数不多时,杂波在空时2维平面展宽很小。相位距离走动只与距离、步进频率及脉冲重复频率有关;相位距离走动效应,导致距离模糊杂波在空域上的分离特性,将有利于距离模糊杂波的抑制。仿真实验验证了该文分析结果的正确性。

For the Forward-Looking （FL） radar using a linear Frequency Diverse Array （FDA）, this paper ,based on the space-time signal model, particularly studies features of clutter space-time spectrum spread and phase range walk. The feature of clutter spectrum spread represents the clutter spectrum spread in angle-Doppler space. When the stepped-frequency is lower, the number of array elements and pulse are a few, clutter space-time spectrum spread is not evident. The feature of phase range walk just relates to the range, stepped-frequency and pulse repetition frequency;the effect of phase range walk leads to the separateness of range ambiguous clutter spectrum, which benefits the suppression of range ambiguous clutter. The validity of the analysis in this paper is proved with simulation results.