系统工程与电子技术 ›› 2023, Vol. 45 ›› Issue (6): 1633-1641.doi: 10.12305/j.issn.1001-506X.2023.06.06

• 电子技术 • 上一篇    

非均匀子带划分的宽带数字阵通道均衡算法

张权1, 方明2,*, 张琦1, 张小贝1   

  1. 1. 上海大学通信与信息工程学院, 上海 200444
    2. 上海航天电子通讯设备研究所, 上海 201109
  • 收稿日期:2022-04-06 出版日期:2023-05-25 发布日期:2023-06-01
  • 通讯作者: 方明
  • 作者简介:张权 (1997—), 男, 硕士研究生, 主要研究方向为雷达信号处理
    方明 (1987—), 男, 工程师, 博士, 主要研究方向为新体制雷达及雷达信号处理
    张琦 (1993—), 男, 讲师, 博士, 主要研究方向为特种光纤器件和光纤传感
    张小贝 (1982—), 男, 教授, 博士, 主要研究方向为特种光纤器件、光学谐振腔和光纤传感

Channel equalization algorithm for wideband digital array based on non-uniform sub-band division

Quan ZHANG1, Ming FANG2,*, Qi ZHANG1, Xiaobei ZHANG1   

  1. 1. School of Communication and Information Engineering, Shanghai University, Shanghai 200444, China
    2. Shanghai Aerospace Electronic Technology, Shanghai 201109, China
  • Received:2022-04-06 Online:2023-05-25 Published:2023-06-01
  • Contact: Ming FANG

摘要:

针对通道严重失配情况下, (加权)最小二乘法的频域均衡性能恶化和均匀子带分解的频域均衡占用过多硬件资源的问题, 提出一种根据均衡滤波器的幅频特性非均匀划分频带实现均衡的方法。首先, 根据幅度改善因子的大小来调整幅度划分的区间; 然后, 合并频点数小于滤波器阶数的相邻幅度区间, 并求出对应的频带; 最后, 在非均匀划分的频带上实现信号的滤波补偿、合成。仿真结果表明, 在通道严重失配情况下, 相比均匀子带划分频域均衡方法, 所提方法在幅度和相位改善因子上分别提高了8.68 dB和8.58 dB, 在滤波器组数和阶数上分别降低了6组和8阶, 可以提高子带频域均衡算法的硬件可实现性, 改善宽带数字阵列雷达中脉冲压缩和数字波束形成的性能, 增强雷达探测能力。

关键词: 频域均衡, 非均匀频带划分, 最小二乘法, 通道扰动模型, 宽带数字阵列雷达

Abstract:

Aiming at the problem that the frequency domain equalization using (weighted) least squares method in the condition of serious channel mismatch achieves a poor performance and the frequency domain equalization with uniform sub-band decomposition occupies too many hardware resources, this paper proposes a method to divide the frequency band unevenly according to the amplitude frequency characteristics of the equalization filter. Firstly, the amplitude division interval is adjusted according to the magnitude of the amplitude improvement factor. Secondly, the adjacent amplitude intervals whose frequency points are less than the filter order are combined, and the corresponding frequency band is obtained. Finally, the filtering compensation and synthesis of the signal are realized on the unevenly divided frequency band. Simulation results show that in the case of serious channel mismatch, compared with the uniform sub-band frequency domain division equalization method, the proposed method improves the amplitude and phase improvement factors by 8.68 dB and 8.58 dB respectively, and reduces the number and order of filter groups by six groups and eight orders respectively, which can improve the hardware realizability of sub-band frequency domain equalization algorithm, and improve the performance of pulse compression and digital beamforming in broadband digital array radar, and finally enhance the detection capacity of the radar.

Key words: frequency equalization, non-uniform frequency band division, least square (LS) method, channel disturbance model, wideband digital array radar

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