GNSS信号体制抗干扰性能分析

以干扰等效载噪比和码跟踪误差为干扰效果评估指标,对当前GPS和Galileo卫星导航信号体制受单频、带限高斯噪声和匹配谱干扰的影响程度分别进行了理论推导和仿真分析,得到信号调制方式和接收机参数设置与增强抗干扰性能的内在联系。在此基础上,将北斗卫星导航系统(BDS)信号体制与GPS和Galileo进行比较,得出BDS的B1-C可优化为CBOC(6,1,1/11)的调制组合方式、B2可设计为导频通道伪随机调制序列相同的TD-AltBOC(15,10)调制、B1-A和B3-A可分别采用TDDM-BOCc(15,2.5)和BOCc(15,2.5)调制的信号抗干扰性能增强建议。

Analysis of Anti-Jamming Performance to GNSS Navigation Signals Design

Using jamming efficient carrier-to-noise ratio and code tracking error as the jamming effect evaluation index, the influence degree of current GPS and Galileo navigation signals suffered from single frequency, band-limited Gaussian noise and matching spectrum jamming is researched respectively by theoretical derivation and simulation analysis. The inner relationship among signal modulation mode, receiver parameters set and enhanced anti-jamming performance is obtained. Comparing the signal systems of Beidou Navigation Satellite System (BDS) with GPS and Galileo, we achieve the following suggestions for enhancing anti-jamming performance: B1-C of BDS can be optimized to the modulation combination of CBOC(6,1,1/11); B2 can be designed TD-AltBOC(15,10) modulation with the same pseudo random modulation sequence of pilot channel; and B1-A and B3-A could employ the signal modulated by TDDM-BOC_c(15,2.5) and BOCc(15,2.5).