基于离散余弦变换的旁瓣对消技术研究

自适应旁瓣对消是一种有效抑制有源干扰的措施。研究了自适应旁瓣对消和合成孔径雷达（SAR）有源遮盖式干扰的基本原理,详细推导了基于离散余弦变换的DCT-LMS频域自适应方法,并将其应用于SAR的旁瓣对消系统中。通过与其他自适应算法的对比实验,证明了DCT-LMS算法兼有收敛速度快,计算量小的优点。最终模拟实际环境中的干扰源,利用SAR的实际数据进行了仿真实验。实验结果表明,DCT-LMS算法能有效地抑制有源干扰噪声,确保SAR接收机正常工作,具有较高的干扰对消比。

SAR Adaptive Side-lobe Jamming Cancellation Based on DCT

Adaptive side-lobe cancellation is an effective method to suppress active interference.The fundamental principle of adaptive side-lobe cancellation and active interference of synthesis aperture radar（SAR） is proposed.The adaptive algorithm of DCT-LMS frequency domain is deduced step by step and is applied to the SAR side-lobe cancellation experiment.By contrast to the other adaptive algorithms,it is proved that DCT-LMS is an effective algorithm with fast convergence rate and small amount of computation.The experiment is carried with practical SAR source data and simulated active interference,which demonstrates that DCT-LMS can effectively suppress the active interference and has a high rate of the interference cancellation suppression（INCANS） .