In order to analyze the efficiency of multi-GNSS combined PPP technology in different complex conditions in the Asia-Pacific region,GNSS observations from five stations are used to simulate three kinds of shelter conditions:surrounded shelter (urban environment),unilateral shelter (canyon environment) and headspace shelter(large bridge subgrade environment).The service advantages and positioning efficiency of multi-system PPP technology are analyzed from the five aspects of available satellite number,PDOP value,available rates,positioning accuracy and convergence time.The numerical results show that,compared to single GPS PPP results,the four-system GNSS PPP results can be improved 300％,40％,2％,20％ and 50％ in terms of available satellite number,PDOP value,available rate,positioning accuracy and convergence time in the normal environment,and 300％,57％,25％,39％ and 52％ in the complex environment.%利用多测站实测GNSS观测数据,模拟四周遮挡(城市环境)、单侧遮挡(峡谷环境)和顶空遮挡(大型桥梁路基环境)3种遮挡环境,从可用卫星数、PDOP值、可用历元率、定位精度和收敛时间5个方面,综合分析多系统PPP技术的定位服务效能.结果显示,相比GPS单系统PPP定位结果,在无遮挡环境下,四系统融合PPP技术在可用卫星数、PDOP值、可用历元率、定位精度和收敛时间方面分别改进300％、40％、2％、20％和50％;在遮挡环境下,分别改进300％、60％、25％、39％和52％.
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