系统工程与电子技术 ›› 2019, Vol. 41 ›› Issue (12): 2669-2674.doi: 10.3969/j.issn.1001-506X.2019.12.01

• 电子技术 •    下一篇

基于时域自适应FIR滤波的空时处理方法

庞晓娇1, 赵永波1,2, 曹成虎1, 徐保庆1, 陈胜1   

  1. 1. 西安电子科技大学雷达信号处理国家重点实验室, 陕西 西安 710071;
    2. 西安电子科技大学信息感知技术协同创新中心, 陕西 西安 710071
  • 出版日期:2019-11-25 发布日期:2019-11-25

Space-time processing method with temporal adaptive FIR filters

PANG Xiaojiao1, ZHAO Yongbo1,2, CAO Chenghu1, XU Baoqing1, CHEN Sheng1   

  1. 1. National Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China; 2. Information Sensing and Understanding, Xidian University, Xi’an 710071, China
  • Online:2019-11-25 Published:2019-11-25

摘要:

传统的后多普勒自适应处理方法,如果仅仅选用一个多普勒通道的输出数据进行空域滤波时,虽然对旁瓣杂波的抑制接近最优,但是对主瓣杂波抑制性能较差。针对以上问题,提出了基于时域自适应有限长单位冲激响应(finite impulse response, FIR)滤波的空时处理方法。该方法先设计一组自适应FIR滤波器,利用这组自适应FIR滤波器对雷达回波数据进行时域FIR滤波,然后分别对同一多普勒通道的输出数据进行空域自适应处理。仿真结果表明,该方法的杂波抑制性能优于1DT方法,而且该方法在天线阵元存在一定的随机幅度和相位误差情况下,杂波抑制性能损失不大。

关键词: 时域自适应有限长单元冲激响应滤波器, 空时自适应处理, 杂波抑制, 降维

Abstract:

In the traditional post-Doppler adaptive processing approach, one-pulse channel is used in the temporal filter and the sidelode clutter can be effectively suppressed, while the performance of the suppressing mainlobe clutter is poor. To address these issues, a space-time processing method based on temporal adaptive finite impulse response (FIR) filters is proposed. This method firstly designs a set of adaptive FIR filters, and then an adaptive Doppler filtering operation is performed to the output data of each column subarray. Finally, adaptive beamforming is applied respectively to process the output corresponding to the same Doppler filter. Simulation results show that the proposed method is superior to the 1DT method. In addition, the performance of proposed method is robust in the presence of the array amplitude-phase error.

Key words: temporal adaptive finite impulse response (FIR) filters, space-time adaptive processing (STAP), clutter rejection, reduced dimension