软件无线电的GNSS干扰盲识别系统

Blind identification system of GNSS interference based on software radio

针对卫星导航系统易受干扰,同时所处电磁环境复杂,往往多源异构干扰并存的问题,提出一个基于软件无线电的GNSS干扰盲识别系统:利用调制信号的高阶统计特性以及时频域特征,对单频干扰、脉冲干扰、线性扫频干扰、调频干扰、BPSK及FSK干扰6种干扰信号进行盲识别;利用软件无线电具有的高度灵活性和功能模块化等特点,使整个系统不仅结构精简,而且具有开放性和可扩展性。实验结果表明,该算法在不需要任何先验知识的情况下,在加性高斯白噪声为20 dB时,可以实现97%以上的总体识别率,并且具有较好的稳定性。

Aiming at the problems that it is susceptible to interference for the satellite navigation system,and there coexist multi-source heterogeneous interferences due to the complex electromagnetic environment,the paper proposed a software radio-based blind identification system of GNSS interference:the characteristics of the modulated signal in high-order statistics and the time-frequency domain were used to blindly identify the six jamming signals of single-frequency,pulse,linear sweep,FM,BPSK and FSK;and the advantages of high flexibility and modular functions of software radio were taken to make the system not only compact in structure,but also open and expandable.Experimental result showed that the algorithm could achieve an overall recognition rate of 97%above when the additive white Gaussian noise is 20 dB without any prior knowledge,meanwhile,with good stability.