多模式低副瓣阵列方向图综合方法

doi:10.12305/j.issn.1001-506X.2024.03.13

Abstract

Abstract:

This paper is aimed at the practical application requirements of low sidelobe array antenna, using the idea of space-time coding to design weighting vector, sequential fast Fourier transform (FFT) method, constraint equation calculation method and optimization function solution method are proposed respectively, corresponding to three different working modes of multi-pulse low sidelobe pattern synthesis, the weighting vector is time-varying, invariant and even odd alternating. Theoretical analysis and simulation experiments show that both sequential FFT and constraint equation calculation methods can realize ultra-low sidelobe pattern (better than -50 dB). The optimization function solution method can achieve low sidelobe while still maintaining the good performance of the mainlobe of the pattern, avoiding the shortcoming that the traditional method cannot take into account the performance of the mainlobe and sidelobe at the same time. In addition, the advantages and disadvantages of different methods are comprehensively analyzed from the aspects of computational complexity, random amplitude and phase error, interference suppression, etc. It can provide theoretical guidance and technical reference for the engineering application of practical array antennas.

Key words: low sidelobe, mainlobe width, array weighted vector, pattern synthesis

CLC Number:

TN95

Guilan ZENG, Yanwen JIANG, Hongqi FAN, Yilun FENG. Multimode method for low sidelobe array pattern synthesis[J]. Systems Engineering and Electronics, 2024, 46(3): 882-891.

Figures/Tables 17

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References 30

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零点状态	PSL/dB	ISLR/dB	副瓣平均电平/dB	主瓣宽度/(°)	运行时长/s
①	-42.1	-22.9	-123.8	6.8	0.65
②	-62.3	-31.6	-115.1	6.9	0.66
③	-51.4	-28.3	-137.1	7.3	0.67

方法指标	无调制	加汉明窗	序贯FFT方法p=100	约束方程计算方法零点②	优化函数求解方法C=9
PSL/dB	-13.2	-41.8	-51.4	-62.3	-44.8
ISLR/dB	0.1	-12.6	-19.7	-31.6	-11.6
副瓣平均电平/dB	-35.0	-52.8	-65.7	-115.1	-52.1
主瓣宽度/(°)	4.5	7.9	7.8	6.9	4.9
运行时长/s	0.01	0.01	1.00	0.65	185

编号	起始频率F₀/Hz	调频斜率v/(Hz/s)	到达角θ_s/(°)	幅值I/V
1	400	1 000	3	0.05
2	800	2 500	5	0.05
3	1 500	-2 000	65	3
4	1 800	-3 000	44	4
噪声	-	-	-	0.5 rms

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Multimode method for low sidelobe array pattern synthesis

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