利用模拟源伪卫星的隧道内虚拟中继定位算法

Algorithm of Virtual Relay Positioning by Simulator Pseudo-satellites in Tunnel

摘要:

针对隧道内缺失卫星导航信号以致人员车辆无法定位的问题，提出了一种利用模拟源伪卫星的隧道内虚拟中继定位算法。模拟源伪卫星产生并播发虚拟轨道伪卫星信号，通过泄漏电缆向隧道内发送，接收采用虚拟中继定位算法，以减小卫星和泄漏电缆不在一条直线上的折线误差。解决了椭圆倾斜同步轨道的虚拟轨道伪卫星参数设计，导航电文产生，卫星到泄漏电缆激励点的信号模拟问题。引入了隧道与隧道口和卫星连线的空间夹角参数，构建了虚拟中继伪距观察方程，实现了虚拟中继定位算法。通过卫星导航接收机接收输出伪距和星历数据，进行二次定位解算，证明能达到亚米级定位精度。

Abstract:

For the problem of missing satellite navigation signals in tunnel so that personnel and vehicles cannot be located,a virtual relay positioning algorithm in the tunnel using an analog source pseudo-satellite is proposed. The analog source pseudo-satellite generates and broadcasts the virtual orbit satellite signal, which is sent to the tunnel through the leaky cable, and the virtual relay positioning algorithm is used for the reception to reduce the folding error that the satellite and the leaky cable are not in a straight line. The problems of virtual orbit satellite parameter design, navigation message generation, and signal simulat-ion from the satellite to the excitation point of the leaky cable are solved for elliptical inclined synchronous orbit. The paramet-ers of the spatial angle between the tunnel and the tunnel mouth and the satellite link are introduced, the virtual relay pseudor-ange observation equation is constructed, and the virtual relay positioning algorithm is implemented. The output pseudorange andephemeris data are received by the satellite navigation receiver, and the second positioning solution is performed, which proves t-hat sub-meter level positioning accuracy can be achieved.