一种GPS接收机级联抗干扰方法  

A kind of cascade anti-jam method for GPS receiver

作　　者：周柱[1] 石峰[1,2] 张尔扬[1] 卢树军[1] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073 [2]空军工程大学工程学院,西安710038

出　　处：《信号处理》2010年第9期1334-1340,共7页Journal of Signal Processing

摘　　要：文章研究GPS接收机抗干扰技术,提出了一种级联抗干扰方法,利用变换域消除窄带干扰,然后用互谱度量方法消除剩余干扰。文章给出了变换域抗窄带干扰方法的一般流程;设计了变换域方法的核心部分频域处理算法。证明在接收信号频谱中,如果某一段频谱平坦或接近平坦,这段频谱就服从高斯分布,并可推出谱线的幅度服从瑞利分布。根据这个性质,提出频谱分段处理的方法,利用接收信号频谱均匀频段的统计特性进行窄带干扰抑制。通过列举空时联合处理方法说明其资源消耗和信号失真均大于本文提出的级联方法。仿真表明在有宽带干扰存在的情况下,使用本文提出的方法可以检测并消除窄带干扰。通过多干扰环境下的仿真,测得该方法的抗干扰能力比空时联合方法更好。The anti-jam technique of GPS is researched in the paper, a cascade anti-jam method is proposed, it eliminates narrowband interference in transform domain, and suppresses the residual interference with Cross Spectral Metric method. A common realization of narrowband interference rejection method in transform domain is provided; and the frequency excision algorithm which is the core of transform domain method is proposed. It is proved that if a slice of the received signal spectrum is fiat or approximate fiat, it is Gaussian distributed, and it can be deduced that the magnitude of spectrum bins is Rayleigh distributed. According to the character, a speetrum slicing method is proposed, which utilizes the statistical property of the flat part of the spectrum to suppress narrowhand interferenee. Through enumerate space-time methods, it is illuminated that this method consume more resource and has severer distortion than cascade methods proposed in the paper. Simulation indicates that when wideband interference exists, narrowband interference can be deteeted and eliminated using the proposed method. Through simulation, it is tested that in multiple jam environment, the method has a better anti-jam capability then space-time adaptive processing （STAP） anti-jam method.

关 键 词：GPS 窄带干扰抑制 频谱分段 统计特性 级联抗干扰方式 

分 类 号：TN911.72[电子电信—通信与信息系统]