基于调频率微调的ISAR抗干扰技术研究

Research on Anti-jamming of Inverse Synthetic Aperture Radar Based on Slope-varying LFM Signal

逆合成孔径雷达的欺骗式干扰技术日趋成熟,而ISAR抗干扰技术则研究不足。在分析了ISAR有源欺骗式干扰的工作原理基础上,提出了基于线性调频信号调频率微调的ISAR抗干扰方法,使虚假目标回波的增益在Dech irp处理时因调频率失配而被抑制。但在该体制下调频率变化导致信号带宽变化,从而距离分辨率改变,为此提出先进行距离像插值再做ISAR成像。针对距离向插值导致的方位向多普勒模糊问题,采用了多普勒域平均处理提高了ISAR成像质量,以利于目标识别。利用仿真数据对该方法进行了验证,结果证明了该方法的有效性。

Deceptive jamming technology against inverse synthetic aperture radar is mature at the present time, but the research on anti-jamming technology for ISAR （Inverse synthetic aperture radar）is deficient at home and abroad yet. Through the analysis on the theory of deceptive jamming technology against ISAR, a new method for anti-jamming against ISAR based on LFM （ Linear frequency modulation） signal＇ s slope variation is presented in this paper. The false target＇ s echo energy is suppressed due to frequency modulation slope mismatching. Doppler domain averaging is adopted for improving the quality of the ISAR image, which helps automatic target recognition （ATR）. Simulation result based on simulating data shows the validity of new algorithm.