基于STK的GPS空间覆盖特性仿真分析  

Analysis and Simulation of Coverage Performance of GPS Based on STK

作　　者：田八林[1] 袁建平[1] 岳晓奎[1] 

机构地区：[1]西北工业大学航天学院,陕西西安710072

出　　处：《计算机仿真》2008年第6期46-49,共4页Computer Simulation

基　　金：863计划资助项目(2005AA745050)

摘　　要：GPS在空间飞行器上的应用越来越广泛。然而,由于信号辐射角的限制,空间用户在一定高度之上存在不可见区域,为了探讨GPS系统对空间用户的可用性和完备性,提出了利用STK进行仿真分析,对该软件自带的GPS星座场景,设置不同的信号辐射角度的限制,对信号辐射角度为32°、40°和46°三种情况下,在不同的高度处航天器对GPS可见星数目进行了仿真,并给出了在空间应用中GPS的可用高度范围。仿真结果显示,航天器对GPS可见星数目随着信号辐射角度的增大而增多,随着高度的降低而增加。GPS is widely used in space, however, there is invisible area because of the restriction of beam angle. In order to discuss the usability and maturity of GPS used in space, the paper puts out a method to realize simulation and analysis of GPS constellation by using STK. Scenario of GPS constellation, which is in possession of STK is utilized. Spacecraft vs number of GPS at different altitudes is simulated by assuming different beam angles such as 32, 40 and 46 degrees, and usable altitude range of GPS is supplied in the end of paper. Simulation results indicate that spacecraft vs number of GPS increases along with increasing of beam angle and decreasing of altitude.

关 键 词：全球定位系统 空间飞行器 卫星仿真工具包 

分 类 号：V324.24[航空宇航科学与技术—人机与环境工程]