摘要
针对采用单卫星定位系统时,在城市高楼密集区和位于深山峡谷的水库、电站、矿山等环境下,GNSS用户接收到的卫星个数少且卫星分布不佳导致的可用性下降、定位精度较差的问题,提出多系统组合的定位方法。利用GPS、GLONASS及GALILEO系统的轨道参数模拟卫星星座,计算不同卫星高度角下单系统及组合系统的DOP值,根据DOP值分析其可用性。研究表明:在全球时空范围内、相同卫星高度角下,组合系统的可用性高于单系统,三系统组合的可用性高于双系统组合。
Many surveying environments, like in urban canyons, deep openpit mines and valleys, limit the number of visible satellites, deteriorating the survey accuracy and therefore a single satellite positioning system hardly satisfies the requirements. To overcome these problems, a method using a GPS/ GLONASS/GALILEO integrated system was proposed. First, the satellites constellation was build based on the different orbit parameters of GPS, GLONASS and GALILEO systems. Secondly, the DOP values about single and integrated systems were calculated using the different elevation satellites. Finally, the DOP values from different combination scenarios were analyzed and its results shown that the accuracy, availa bility and reliability were improved compared with the single systems, and the three combi nation scenarios is superior to the tows.
出处
《全球定位系统》
2012年第5期32-37,共6页
Gnss World of China
