基于虚拟卫星的隧道内卫星导航信号增强方法

针对现有卫星导航接收机在隧道内无法有效定位的问题,提出了基于虚拟卫星的隧道内卫星导航信号增强方法。通过建立信号传播模型,在隧道两端模拟位于隧道延长方向的低仰角卫星的导航信号,发出后在隧道内接收解算,实现定位。同时,使用信号时延控制方法对伪距误差进行预补偿。经过硬件系统的实验分析,验证了其在隧道内的定位能力,仿真实验结果表明系统定位精度满足大部分隧道需求。

Method for Enhancing Satellite Navigation Signal in Tunnel Based on Virtual Satellite

For the problem that the existing satellite navigation receiver cannot realize effectively positioning in tunnel,a virtual satellite-based satellite navigation signal enhancement method is proposed.By establishing a signal propagation model,the navigation signals of the low elevation satellites located in the extension direction of the tunnel are imitated at both ends of the tunnel and received and decoded in the tunnel to obtain the position.At the same time,the signal delay control method is used to pre-compensate the pseudorange error.By the experimental analysis of the hardware system,its positioning ability in the tunnel is verified,and the simulation results show that the system positioning accuracy meets most tunnel requirements.