脉内频率-时延捷变雷达抗间歇采样转发干扰方法

doi:10.12305/j.issn.1001-506X.2024.05.13

Abstract

Abstract:

Utilizing fast and accurate sampling and forwarding, interrupted sampling and repeater jamming forms false target groups by using the matching filtering characteristics of pulse pressure radar, which seriously affects the performance of target detection and tracking. To solve this problem, an intra-pulse frequency-time-delay agile waveform is designed by combining waveform design and filtering. On this basis, an anti-interrupted sampling and repeater jamming method based on time-frequency analysis is proposed. Firstly, the linear frequency modulation (LFM) signal is divided into multiple sub-pulses, and the random time delay is added between the sub-pulses. Then, the undisturbed sub-pulse is extracted to judge the target location accurately. Combined with the prior information such as the sub-pulses frequency and random time delay, the iterative threshold segmentation algorithm is used to remove the intense jamming signal. Finally, sub-pulse filtering and time-domain filtering are processed by constructing time-frequency and time-domain bandpass filters respectively. Simulation results show that the proposed method has good interrupted sampling and repeater jamming performance under different jamming to signal ratio, signal to noise ratio, and asynchronous sampling conditions.

Key words: interrupted sampling and repeater jamming, waveform design, time frequency analysis, iterative threshold segmentation algorithm

CLC Number:

TN974

Chuang NIU, Qiang LIN, Min DUAN, Duanyang SHI, Chenggang GU. Anti-interrupted sampling and repeater jamming method for intra-pulse frequency and time delay agile radar[J]. Systems Engineering and Electronics, 2024, 46(5): 1583-1598.

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参数	数值	参数	数值
脉冲数	64	子脉冲数	5
带宽/MHz	40	子带宽/MHz	8
脉宽/μs	10	子脉宽/μs	2
载频/GHz	10	时延/μs	1, 1, 1, 2
重复周期/μs	400	采样率/MHz	80
脉冲序号	5, 3, 2, 4, 1	目标距离/m	51 000

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Anti-interrupted sampling and repeater jamming method for intra-pulse frequency and time delay agile radar

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