Journal of Systems Engineering and Electronics ›› 2013, Vol. 35 ›› Issue (7): 1409-1414.doi: 10.3969/j.issn.1001-506X.2013.07.10

• 传感器与信号处理 • 上一篇    下一篇

基于插值理论的分数延迟杂波自适应对消算法

赵耀东, 吕晓德, 李纪传, 向茂生   

  1. 1. 中国科学院电子学研究所微波成像技术国家重点实验室, 北京 100190;
    2. 中国科学院大学, 北京 100049
  • 出版日期:2013-07-22 发布日期:2010-01-03

Adaptive fractionaldelay clutter cancellation algorithmbased on interpolation theory

ZHAO Yaodong, L Xiaode, LI Jichuan, XIANG Maosheng   

  1. 1. National Key Laboratory of Science and Technology on Microwave Imaging, Institute of Electronics, Chinese Academy 
    of Sciences, Beijing 100190, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Online:2013-07-22 Published:2010-01-03

摘要:

针对无源雷达信号处理中分数延迟直达波及多径杂波不能被完全对消的问题,提出了一种非因果的归一化最小均方(normalized least mean square, NLMS)自适应对消算法。根据采样信号的插值理论,推导出了分数延迟直达波相对于参考信号具有非因果系统响应的特点,然后在传统NLMS对消器的基础上,通过增加部分非因果的滤波网〖JP3〗络同时实现了最小均方误差(least mean square error, LMSE)准则下的自适应插值和杂波抑制。经过计算机仿真及实测数据验证,该算法相较于目前已有方法能够降低计算复杂度,并在相同条件下获得更高的杂波相消比。

Abstract:

The directpath and multipath reflected clutter cannot be cancelled completely when there is fractionaldelay between the echo signal and reference signal in a passive radar. A novel algorithm of clutter cancellation is presented, which has the form of noncausal normalized least mean square (NLMS) adaptive filter. Based on the interpolation theory, the general adaptive canceller can be extended by adding few noncausal coefficients, which is adaptive insertion algorithm equivalently for the least mean square error (LMSE) criterion. The simulation results indicate that the algorithm presented can achieve a better performance than the general cancellation technique at prese〖JP〗nt and has lower complication, which is of great benefit to the real-time implementation.

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