CAJ | 학술논문

外辐射源雷达面临严重的多径杂波问题，扩展相消批处理算法(ECA-B)是一种有效的杂波抑制算法，但该算法的分块批处理使得相消距离元内的杂波和目标回波受到调制，导致杂波不能被完全相消而且会产生附加的模糊目标。该文分析了ECA-B算法的调制机理并提出了相应的补偿方法，该方法首先通过载波频偏精估计来补偿杂波调制，然后通过合理选择分块数以避免目标调制或通过估计调制距离元处每块信号的零频分量来补偿目标调制。仿真和实测数据处理结果验证了文中调制机理分析的正确性和所提方法的有效性，完善了该算法的性能。
외복사원뢰체면림엄중적다경잡파문제，확전상소비처리산법(ECA-B)시일충유효적잡파억제산법，단해산법적분괴비처리사득상소거리원내적잡파화목표회파수도조제，도치잡파불능피완전상소이차회산생부가적모호목표。해문분석료ECA-B산법적조제궤리병제출료상응적보상방법，해방법수선통과재파빈편정고계래보상잡파조제，연후통과합리선택분괴수이피면목표조제혹통과고계조제거리원처매괴신호적령빈분량래보상목표조제。방진화실측수거처리결과험증료문중조제궤리분석적정학성화소제방법적유효성，완선료해산법적성능。
The passive radar faces a significant problem in multipath clutter, and the Batch version of the Extensive Cancellation Algorithm (ECA-B) is an efficient method for clutter mitigation. However, the clutter and target echoes, whose delays are included in the cancelled range area, are modulated due to the block batch processing in the algorithm, and it results in the clutter residues and false target emergences. The modulation mechanism of ECA-B is analyzed and the corresponding compensation method is proposed in this paper. The basic principle of the method is to compensate the clutter modulation by carrier frequency offset fine estimation and then avoid the target modulation by selecting the block number properly or compensate the target modulation by estimating zero frequency components of every block signal in the modulated range cell. The simulation and real-life data results confirm the correctness of the analysis on the modulation mechanism and the validity of the proposed method, which improves the algorithm performance.