基于非合作LEO卫星辅助GNSS联合定位技术CSCD

针对全球导航卫星系统(GNSS)在受挑战的环境中,出现导航卫星信号被干扰或遮挡,导致可见卫星数目无法满足定位最低要求的情况。利用低轨(LEO)卫星具有信号到达地面功率高、抗干扰能力强,以及在未来将进行大量部署的特点,可为GNSS的导航服务提供备份与补充。提出了基于非合作LEO卫星辅助GNSS联合定位算法,不同于现有的LEO/GNSS联合定位算法将低轨卫星简单地视为轨道降低的导航卫星,该算法以LEO为通信卫星,从非合作、非导航特性的实际情况出发,将LEO的多普勒与GNSS的伪距、多普勒相结合求解用户位置信息,并以ORBCOMM低轨通信卫星联合GPS为例进行了仿真实验,实验结果验证了算法的可行性与性能。

Non-Cooperative LEO Satellite Assisted GNSS Joint Positioning Technology

In a challenging environment, the signal of the Global Navigation Satellite System (GNSS) may be interfered or blocked, resulting in a situation where the number of visible satellites cannot meet the minimum requirements for positioning. Considering the high power and strong anti-interference ability of signals reaching the ground, and the large numbers of deployment in the future, Low Earth Orbit(LEO) satellites can be used to provide backup and supplementation for the navigation services of the GNSS. Unlike the current LEO/GNSS joint positioning scheme that simply regards LEO satellites as navigation satellites with low orbits, we proposes a non-cooperative LEO satellite-assisted GNSS joint positioning algorithm regarding LEO communication satellites as non-cooperative and non-navigation satellites. By combining the pseudorange and the Doppler of the GNSS with the Doppler of the LEO, the position of the user is calculated. A mathematical simulation is carried out by taking ORBCOMM LEO communication satellite (ORB) combined with GPS as an example, the simulation result verifies the feasibility and performance of the algorithm.