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针对卫星导航信号体制抗多径性能的分析需求,在论述L1/E1/B1频段(1575.42MHz)最新卫星导航信号体制的基础上,分别推导得到基于非相干超前减滞后处理和反正切鉴别器下的码跟踪多径误差包络和载波相位跟踪多径误差的解析表达式,仿真分析了接收机早迟码间距、前端预相关带宽和导航信号调制方式等设计因素对多径误差产生的影响。分析结果表明:为了提高抗多径性能,BDS的B1-C公开服务信号可采用类似Galileo E1OS组合方式的MBOC(6,1,1/11)调制;BDS的B1授权信号可建议优化为BOCcos(15,2.5)调制。
Based on the analysis of the latest satellite navigation signal system in L1 / E1 / B1 frequency band (1575.42MHz), aiming at the demand of anti-multipath performance of satellite navigation signal system, the non-coherent pre-delay and post-delay discriminator The effects of design factors such as the receiver’s early and late code spacing, the front-end bandwidth of precoding and the modulation method of navigation signal on the multipath error were analyzed. The analysis results show that in order to improve anti-multipath performance, BDS’s B1-C public service signal can be modulated by MBOC (6,1,1 / 11) which is similar to the combination of Galileo E1OS. The B1 authorized signal of BDS can be optimized to BOCcos 15,2.5) modulation.