J4 ›› 2015, Vol. 42 ›› Issue (6): 158-163.doi: 10.3969/j.issn.1001-2400.2015.06.027

• 研究论文 • 上一篇    下一篇

一种新的角度多普勒补偿方法

冯为可1;张永顺1;张丹2   

  1. (1. 空军工程大学 防空反导学院,陕西 西安  710051;
    2. 西安电子科技大学 电子工程学院,陕西 西安  710071)
  • 收稿日期:2014-07-31 出版日期:2015-12-20 发布日期:2016-01-25
  • 通讯作者: 冯为可
  • 作者简介:冯为可(1992-),男,空军工程大学硕士研究生,E-mail: fengweike007@163.com.
  • 基金资助:

    国家自然科学基金资助项目(60372033)

Novel angle Doppler compensation method

FENG Weike1;ZHANG Yongshun1;ZHANG Dan2   

  1. (1. Air and Missile Defense College, Air Force Engineering Univ., Xi'an  710051, China;
    2. School of Electronic Engineering, Xidian Univ., Xi'an  710071, China)
  • Received:2014-07-31 Online:2015-12-20 Published:2016-01-25
  • Contact: FENG Weike

摘要:

由于机载非正侧雷达杂波空时耦合关系存在严重的距离依赖性,故训练样本单元与待测单元的杂波不服从独立同分布.角度多普勒补偿方法是补偿杂波距离依赖性的有效手段,但在系统存在速度误差和角度误差时,杂波依赖性补偿性能下降.针对这个问题,提出了基于稀疏恢复的角度多普勒补偿方法——SR-ADC方法.该方法首先对训练样本单元和待测单元的雷达回波数据进行稀疏恢复得到杂波空时谱;然后确定杂波谱中心及其空间频率和多普勒频率,并以此计算空时转换矩阵,使训练单元杂波与待测单元杂波分布特性趋于一致.与常规角度多普勒补偿相比,SR-ADC方法能够实现杂波距离依赖性的自适应补偿,在存在误差时也能取得较为理想的补偿.

关键词: 机载非正侧阵雷达, 杂波距离依赖性, 角度多普勒补偿, 稀疏恢复

Abstract:

In a non-side looking airborne radar system, the clutter of different range cells is not independently and identically distributed, which is caused by the severe clutter range-dependence. The clutter range-dependence can be compensated by the angle Doppler compensation (ADC) method simply and quickly. Although the ADC is widely applied, the compensation performance of the ADC is affected by the system error significantly because of the mismatch between Doppler frequency and spatial frequency. In this paper, a novel method to compensate the clutter range-dependence, namely ADC using sparse recovery (SR-ADC), is proposed. Firstly, the clutter spectral distribution estimation of the test cell and training cells are obtained by using sparse recovery. Then, the spatial frequencies and Doppler frequencies of the clutter spectrum center are determined. Finally, transform matrixes of different training cells are designed so that the clutter of training cells could be nearly stationary with respect to that of the test cell. Compared with the traditional angle Doppler compensation method, the proposed method improves greatly the compensation performance, especially that of main-lobe clutter. In addition, this method can also achieve good performance when the system error exists.

Key words: non-side looking airborne radar, clutter range-dependence, angle Doppler compensation, sparse recovery

中图分类号: 

  • TN959