波形编码抗主瓣干扰方法带宽限制分析及优化

doi:10.12305/j.issn.1001-506X.2025.08.12

Abstract

Abstract:

To address the problem that the main-lobe jamming （MLJ） is highly correlated with the signal of interest （SOI） in spatial domain, making it difficult to suppress the jamming, an anti-MLJ system based on hopping coding waveform performs the coding modulation for waveform, then the receiver reconstructs the received signal. Through code-spatial mapping, the spatial channel of the SOI is equivalently changed, achieving the spatial domain resolution of SOI and jamming signal. However, theoretical analysis reveals that the increase in signal bandwidth obscure the coding characteristics and render the method ineffective. To this end, the time-frequency mapping characteristics of the multi-tap system are utilized. By designing the multi-tap structure, the bandwidth coverage is reduced, and the coding characteristics are highlighted again. Simulation results show that the proposed method achieves a jamming cancellation ratio greater than 25 dB over the full bandwidth of 10 MHz, with an SOI cancellation ratio of less than 3 dB, demonstrating great anti main-lobe non-zero bandwidth jamming performance.

Key words: anti-main-lobe jamming （MLJ）, limitation of bandwidth, radar, waveform design, multi-tap

CLC Number:

TN 974

Juntian BO, Wantian WANG, Yaxing LI, Yunshuo ZHANG, Hengfeng WANG, Jiahao ZHANG, Jin MENG. Analysis and optimization of bandwidth limitation for anti-mainlobe jamming method based on waveform coding[J]. Systems Engineering and Electronics, 2025, 47(8): 2540-2548.

Figures/Tables 12

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References 30

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序号	基带带宽/Hz	中心频点处		全频段
序号	基带带宽/Hz	SOI对消比/dB	干扰对消比/dB	SOI对消比/dB	干扰对消比/dB
1	0	1.08×10⁻⁴	44.61	—	—
2	10	0.28	32.71	0.19	32.06
3	100	0.58	23.63	0.23	24.17
4	1×10³	0.80	20.18	1.41	21.55
5	10	0.87	17.38	3.75	18.13
6	100	4.35	15.86	6.33	16.74
7	1×10⁶	8.87	14.35	10.71	15.92

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Analysis and optimization of bandwidth limitation for anti-mainlobe jamming method based on waveform coding

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