室内伪卫星信号多径微观参数统计模型

Multipath microscopic parameter statistical model of indoor pseudolite signal

针对伪卫星应用于室内定位多径微观参数传播特性未知的问题,综合考虑室内伪卫星信号体制特点及典型应用环境特征,结合已有的室内无线通信信号统计模型,提出了室内伪卫星信号多径微观参数理论模型。通过将室内典型环境下归纳统计得到的射线追踪确定性模型与理论模型相匹配,从仿真角度验证了理论模型的正确性。结果表明:多径延迟扩展模型符合瑞利分布,且多径延迟分布与伪卫星高度角相关;同时,伪卫星多径平均功率随延迟增加呈指数衰减。在办公区域中,多径生命周期覆盖0μs到0.3μs,且透射多径大多属于短寿命多径,长寿命多径分量属于反射多径。

Aiming at the problem of unknown propagation characteristics of multipath microscopic parameters in indoor positioning using pseudolite,a theoretical model of multipath microscopic parameters of indoor pseudolite signals is proposed with considering the characteristics of indoor pseudolite signal system and typical application environment characteristics,and combining with the existing statistical model of indoor wireless communication signals.The ray tracing deterministic model is obtained by inductive statistics in the indoor typical environment,and by matching it with the theoretical model,the correctness of the theoretical model is verified from the simulation perspective.The simulation results show that the multipath delay spread model accords with the Rayleigh distribution,and the multipath delay distribution is related to the pseudolite height angle.Meanwhile,the pseudolite multipath average power decreases exponentially with the increase of delay.In the office area,the multipath lifetime covers 0μs to 0.3μs,and the transmission multipath mostly belongs to the short life multipath,while the long life multipath component belongs to the reflection multipath.