Abstract: The data-link system is easily subjected to interference under complex battlefield electromagnetic environment, so as to reduce the interconnectivity performance of the communication system. In order to solve the problem, a new anti-jamming method was proposed to improve the system performance of communication anti-jamming,which integrated the space trap technology with smart array-antenna and relative positioning technology with data-link. The Direction Of Arrival (DOA) of desired signal was firstly obtained through the relative positioning technology of data-link. Then, the radiation pattern of multi-antenna array was automatically rebuilt. The goals of keeping constant gain on the orientation of the desired communication signal and forming null steering on the orientation of jamming signal were implemented to suppress jamming signal. The proposed method was tested and validated on software defined radio platform in the laboratory environment. The experimental results show that, the proposed method has improved the interference suppression ability of system above 40 dB. The proposed method has extended the anti-jamming method of system data-link from traditional time/frequency domain to spatial domain, and it can be used for anti-jamming in the relevant communication system.

Key words: data-link, anti-jamming, relative positioning, radiation pattern, software defined radio

摘要： 针对战场复杂电磁环境下数据链系统容易受到干扰导致通信互联互通能力下降的问题，提出了一种将智能天线阵空域陷波技术和数据链相对定位技术综合应用的抗干扰方法，来辅助提升系统的通信抗干扰能力。该方法通过数据链相对定位获取期望信号的来波方向，并对多天线阵列进行辐射方向图自主重构，实现在通信信号方向保持增益恒定且在干扰信号方向形成零陷的目标，达到干扰信号抑制的目的。在实验室环境下基于软件无线电平台对所提方法进行了仿真验证，实验结果表明，该方法可以提升40 dB以上的系统干扰抑制能力。该方法将数据链抗干扰手段从传统的时/频域拓展到空域，可以应用于相关系统抗干扰。

关键词: 数据链, 抗干扰, 相对定位, 辐射方向图, 软件无线电