一种LTE信号辅助的导航信号多径消除算法

对于城市环境中的高精度单频GNSS接收机而言,若考虑误差预报处理已抵消电离层误差,则地面传播环境所导致的多径效应将成为系统误差的主要因素。基于现有蜂窝通信的高分辨率信道估计结果,针对电波传播的幅度、相位、多普勒等特征提取信道响应函数,在极小误差范围内提供至L波段信号的线性特征映射。相关仿真结果和实测定点化测试结果表明,所提出的算法在不提高GNSS接收机算法复杂度的前提下,可有效降低GNSS信号的多径搜索范围,在高分辨率信道特征支撑下有效分离多径并提高处理能力。

A multi-path cancellation proposal of navigation signal assisted by LTE signal

For the high-precision single-frequency GNSS receiver in urban environment,considering that the error prediction processing has offset the ionospheric errors,the ground communication environment multi-path effect becomes the main factor of systematic errors.This paper is based on the high-resolution channel estimation result on the currently used cellular communication,extracting the channel response function from the knowledge of amplitude,phase and Doppler frequency shift of the wave,providing a linear feature mapping to L-band within a significantly low error range.Simulation and actual test result shows the algorithm proposed in this paper can effectively reduce the multi-path searching area of GNSS signal and separate multi-path under the high-resolution channel characteristics without increasing the complexity of GNSS receiver.