三星定位原理研究

双星定位系统只需要两颗同步卫星便可以为用户提供定位服务,但却存在着用户位置易暴露和用户数量易饱和这两大缺陷。建议采用三颗同步导航卫星像GPS卫星那样向用户播发导航电文,用户接收机根据这些导航电文信息以及气压高度表信息,像GPS接收机那样解算用户位置,从而克服了双星定位的两大缺陷。仿真表明本定位原理行之有效。

APPROACH TO POSITIONING WITH THREE GEOSTATIONARY SATELLITES

The GEOSTAR system uses only two geostationary satellites to provide positioning service for a certain user, while there are two great drawbacks in it, i.e , the position of the user is liable to be detected by enemy and the number of users is liable to be saturated. This paper suggests a brand new positioning system which employs three geostationary satellites emitting radio signals to users just like the GPS satellites do, and allows the user's receiver to solve position based on the received radio signal as well as the reading of barometer; hence, the drawbacks of GEOSTAR are overcome. Simulation results show that the principle of this new positioning system is correct and effective.