一种特征消除的SAR盲移频干扰方法

针对传统移频干扰存在移频干扰特征和无法对抗波形捷变合成孔径雷达(SAR)信号的缺点,文中提出了特征消除的SAR盲移频干扰方法。首先,对接收到的两路SAR信号分别进行延时和2倍频谱扩展;然后,将两路信号进行共轭相乘产生干扰信号,从而将频谱扩展后的信号恢复成原来的SAR回波信号样式,并引入移频干扰相位调制项,可在SAR距离向产生前移、滞后假目标干扰。该方法不仅消除了移频干扰特征,而且能够有效对抗波形捷变SAR雷达信号,是一种盲移频干扰方法。理论分析和仿真实验证明了该方法的可行性和有效性。

A Blind Shift-frequency Jamming Method of Eliminating Characteristic for SAR

The traditional shift-frequency jamming has the unique characteristic and is invalid for waveform agile synthetic aperture radar (SAR), so a blind shift-frequency jamming method of eliminating characteristic is proposed for SAR. One channel signal is time delayed and the signal spectrum of the other channel is expanded by 2 times, and then they are conjugated multiply to generate jamming signal. The signal of spread spectrum is restored to original form of SAR echo, and an additional modulation phase is added to the shift-frequency jamming signal, so it can produce fronted and lagged false targets in the range direction. This method not only eliminates the shift-frequency jamming characteristic, but also provides a new feasible approach against waveform agile SAR, so it''s a blind shift-frequency jamming method. Theoretical analysis and computer simulation justify the validity and efficiency of the method.