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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。
In order to overcome the shortcomings of conventional frequency-shifted interference, such as frequency-shifting interference and wave-agile synthetic aperture radar (SAR) signals, a feature-canceling SAR blind-shifting method is proposed. First, the received two-way SAR signals are time-delayed and twice-spread respectively. Then, the two signals are conjugate multiplied to generate an interference signal, so that the spectrum-spread signal is restored to the original SAR echo signal Style, and the introduction of frequency-modulated jamming phase modulation, can be generated in the SAR distance to move forward, hysteresis false target interference. This method not only eliminates the characteristics of frequency-shifted interference but also can effectively combat the waveform agile SAR radar signal, which is a blind-frequency-shift interference method. Theoretical analysis and simulation experiments show that the method is feasible and effective.