Positioning accuracy and reliability of GALILEO, integrated GPS-GALILEO system based on single positioning model  

作　　者：ZHAOChunmei OUJikun YUANYunbin 

机构地区：[1]InstituteofGeodesyandGeophysics,ChineseAcademyofSciences,Wuhan430077,China//ChineseAcademyofSurveyingandMapping,Beijing100039.China [2]InstituteofGeodesyandGeophysics,ChineseAcademyofSciences,Wuhan430077,China

出　　处：《Chinese Science Bulletin》2005年第12期1252-1260,共9页

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.40474009 and 40204001);the Know ledge lnnovation Project of Chinese Academy of Sciences(Grant No.030185).

摘　　要：A kind of uniform reliability index suitable for the code and phase observations is presented and used in reliability evaluation of satellite systems. Then, based on 25 stations of Crustal Movement Observation Network of China, satellite visibility, positioning availability and observationreliability of GPS, GALILEO and integrated GPS- GALILEO are calculated and analyzed in detail. Simulation results reveal that the satellite visibility of GALILEO is superior to that of GPS. Given positioning accuracy, horizontal positioning availability of GALILEO is consistent with that of GPS, but its vertical positioning availability is superior to that of GPS. However, the integrated GPS-GALILEO is shown to be superior to each of the single systems in the aspects of positioning accuracy and availability. The reliability of code and phase observationsbased on GALILEO and integrated GPS-GALILEO system is superior to that of GPS both in spatial and temporal domains on the whole. The new reliability index presented is simple to calculate and reflects reliability differences ofdifferent satellite systems.A kind of uniform reliability index suitable for the code and phaseobservations is presented and used in reliability evaluation of satellite systems. Then, based on 25stations of Crustal Movement Observation Network of China, satellite visibility, positioningavailability and observation reliability of GPS, GALILEO and integrated GPS-GALILEO are calculatedand analyzed in detail. Simulation results reveal that the satellite visibility of GALILEO issuperior to that of GPS. Given positioning accuracy, horizontal positioning availability of GALILEOis consistent with that of GPS, but its vertical positioning availability is superior to that ofGPS. However, the integrated GPS-GALILEO is shown to be superior to each of the single systems inthe aspects of positioning accuracy and availability. The reliability of code and phase observationsbased on GALILEO and integrated GPS-GALILEO system is superior to that of GPS both in spatial andtemporal domains on the whole. The new reliability index presented is simple to calculate andreflects reliability differences of different satellite systems.

关 键 词：人造卫星 GPS 全球定位系统 稳定性 

分 类 号：P228.4[天文地球—大地测量学与测量工程]