【作者】 孙炳章； 李景文；

【Author】 Sun-Bingzhang,Li-Jingwen (School of Electronics and Information Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China)

【机构】 北京航空航天大学电子信息工程学院；

【摘要】 对合成孔径雷达(SAR)的移频干扰信号在时域和SAR回波完全重叠,在频域部分重叠,传统的滤波方法很难实现有效的干扰抑制。为此,基于移频干扰信号时频分布特性和分数阶Fourier变换(FRFT)对线性调频信号的时频聚集特性,提出了针对移频干扰的抑制方法,在分数Fourier域对移频干扰进行了有效的抑制。最后通过计算机仿真对本文方法进行了分析,仿真结果与理论分析相符。更多还原

【Abstract】 Because the shift-jamming signals and the SAR echo signals are mixed completely in time domain and overlapping in frequency domain,it is usually very hard to separate them with the traditional filtering method.Based on the time-frequency distribution and Fractional Fourier Transform(FRFT) domain characters for the chirp signal and the shift-jamming signals,a novel and effective suppression method to eliminate the shift-frequency jamming signals is proposed.Computer simulation is also provided in this paper to testify the validity of the method.更多还原