非均匀子带划分的宽带数字阵通道均衡算法

doi:10.12305/j.issn.1001-506X.2023.06.06

Abstract

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

CLC Number:

TN967.51

Quan ZHANG, Ming FANG, Qi ZHANG, Xiaobei ZHANG. Channel equalization algorithm for wideband digital array based on non-uniform sub-band division[J]. Systems Engineering and Electronics, 2023, 45(6): 1633-1641.

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均衡方法	幅度改善因子	相位改善因子
方法1	35.44	11.09
方法2	63.02	37.23

均衡方法	幅度改善因子	相位改善因子
方法1	8.92	-11.05
方法2	43.99	25.82
方法3	52.67	34.40

参数类型	参数值
相对带宽	20%
阵元数量	24
阵元间距/m	0.015
波长/m	0.027 3
脉冲宽度/μs	1
主瓣方向/(°)	30
目标距离/m	1 000

均衡方法	方向图主瓣增益	方向图主副瓣比	方向图平均副瓣电平
方法1	0.52	21.07	-21.52
方法2	0.11	26.03	-28.30
方法3	0.10	26.01	-28.39

均衡方法	脉冲压缩主瓣增益	脉压图主副瓣比	脉压图平均副瓣电平
方法1	0.65	26.78	-61.81
方法2	0.14	30.26	-62.94
方法3	0.15	30.33	-63.00

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

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