CAJ | 학술논문

　　射频干扰（RFI）会造成低频段合成孔径雷达（SAR）成像质量恶化，影响正确解译和判读．针对线性调频（LFM）信号的SAR，提出了一种基于距离频谱域杂波估计的RFI抑制方法，采用特征分解完成RFI检测，利用平均周期图和直方图统计得到成像场景杂波强度的最大似然（ML）估计，通过阈值判断方法确定RFI信号的频谱区间后，在距离频域采用维纳滤波器进行RFI信号的滤除．L波段SAR数据的处理结果验证了该方法的有效性．
　　사빈간우（RFI）회조성저빈단합성공경뢰체（SAR）성상질량악화，영향정학해역화판독．침대선성조빈（LFM）신호적SAR，제출료일충기우거리빈보역잡파고계적RFI억제방법，채용특정분해완성RFI검측，이용평균주기도화직방도통계득도성상장경잡파강도적최대사연（ML）고계，통과역치판단방법학정RFI신호적빈보구간후，재거리빈역채용유납려파기진행RFI신호적려제．L파단SAR수거적처리결과험증료해방법적유효성．
Radio frequency interference (RFI) has been known to deteriorate imaging quality of the low frequency band synthetic aperture radar (SAR), which effects correct interpretation. For SAR using linear frequency modula?tion (LFM) signals, a new RFI suppressing method based on clutter estimation in range frequency domain was pro?posed in this paper. The method uses Eigen-decomposition to complete RFI detection and gets maximum likelihood (ML) estimation of clutter intensity for imaging scene by using statistics of the averaged periodogram and the histo?gram. After determining spectrum intervals of RFI signals by the judging method of threshold, Wiener filter was ap?plied to filter the RFI signals in the range frequency domain. The processing results of L-band SAR data verify the effectiveness of this method.