弹载数据链抗干扰性能分析

Analysis on Anti-Jamming Performance of Missile-Borne Data-Link

针对电磁环境与人为干扰共存环境下的弹载数据链系统性能评估问题,构建了信号和干扰经历不同传播衰落信道条件下的数据链接收信号模型,分析了不同干扰样式特性及功率谱,并据此推导了QPSK数据链系统的误符号性能表达式。针对不同干扰样式的仿真结果表明,当干信比较小且干扰因素占主导时,梳状谱干扰样式的干扰效果较好（优于其他干扰样式约1-3dB）,噪声调幅干扰次之,噪声调频和宽带扫频两种干扰样式差别不大。

To solve the problem of performance evaluation for missile-borne data-link system with artificial jammer,a receiving signal model is constructed with data-link signal and jamming signal undergoing different fading channels.Then,the characteristic and power spectrums of different jamming patterns are analyzed and the symbol error ratio of data-link system with QPSK modulation is also derived.The simulation results of different jamming patterns show that the comb spectrum jamming is optimal（about 1—3dB better than other jamming patterns）and noise amplitude modulation jamming is followed,while noise frequency modulation and broadband sweep make little difference when jamming-signal-ratio is small as well as jamming is dominated.