国际GNSS监测评估系统数据采集与服务的研究及应用

【目的】国际GNSS监测评估系统（international GNSS Monitoring and Assessment System,iGMAS）通过布设全球GNSS跟踪站网,对全球四大卫星导航系统运行状况和主要性能指标进行监测和评估,由全球跟踪站网、数据中心等组成。【方法】全球跟踪站网主要完成原始观测数据采集,包括：导航卫星码伪距、载波相位、多普勒等,并发送到数据中心。数据中心收集跟踪站网的标准格式观测数据,对原始数据进行质量检查,并分类存储和备份,同时接收分析中心和产品综合中心数据处理后生成的轨道、钟差、大气等精密产品,并通过FTP、WEB等多种手段以标准数据格式提供GNSS数据和产品的服务。【结果】在GNSS监测评估、精密时间频率、地球动力学、大气科学、精密测绘等多个领域得到了应用。

Research and Application of iGMAS Data Collection and Service

[Objective]The international GNSS Monitoring and Assessment System(iGMAS)monitors and evaluates the operation status and performance of the world’s four major satellite navigation systems through the deployment of a global tracking station network.It is composed of a global tracking station network,data centers,etc.[Methods]The global tracking station network is responsible for the collection and preprocessing of the observation data from the navigation satellites,such as code pseudo range,carrier phase,and Doppler data,and transmits the data to the data center.The data center collects the standard format observation data of the tracking station network and performs quality inspections,classification,storage,and backup.At the same time,it receives precise products such as orbit,clock offset,atmosphere corrections processed by the analysis center and product service center.It provides standard format data and products through a variety of methods,such as FTP and WEB.[Results]The data and products have been applied in many fields such as GNSS monitoring and evaluation,precise time and frequency field,geodynamics,atmospheric science,precise surveying,and mapping.