Ground-Based Doppler Orbitography by Radiopositioning Integrated on Satellite (DORIS) Station Position Time Series Product from NASA CDDIS

Doppler Orbitography by Radiopositioning Integrated on Satellite (DORIS) Station Position Time Series Product from the NASA Crustal Dynamics Data Information System (CDDIS). DORIS is a dual-frequency Doppler system consisting of a receiver flying aboard a satellite and a globally distributed network of ground beacons. The DORIS receiver on-board the orbiting satellite tracks the dual-frequency radio signals transmitted by the network of ground beacons and generates the DORIS data. A measurement is made of either the Doppler shift or absolute phase as the satellite’s orbit moves over the ground-based beacon. DORIS data records contain a time-tagged range-rate measurement with associated ancillary information. DORIS observations from a global network can be utilized for a variety of products. Analysis Centers (ACs) of the International DORIS Service (IDS) retrieve DORIS data on a regular basis and after producing the weekly SINEX files using the current ITRF, compute station position time series solutions for the DORIS beacons supporting the IDS network. The IDS Analysis Center Coordinator combines these individual AC solutions to generate the official IDS DORIS network time series solution in the IDS STCD (Station Coordinates Difference) format.

美国国家航空航天局（NASA）地壳动力学数据信息系统（CDDIS）提供的Doppler测位综合卫星（DORIS）站位置时间序列产品。DORIS为一种双频多普勒系统，包括搭载于卫星上的接收器和全球分布的地面信标网络。卫星上的DORIS接收器追踪由地面信标网络发射的双频无线电信号，并生成DORIS数据。当卫星的轨道经过地面信标时，测量多普勒频移或绝对相位。DORIS数据记录包含带有时标的距离-速率测量值及相关辅助信息。国际DORIS服务（IDS）的分析中心定期检索DORIS数据，并在使用当前国际地球自转参考系（ITRF）生成每周SINEX文件后，计算支持IDS网络的DORIS信标的站位置时间序列解。IDS分析中心协调员将这些个别分析中心的解决方案综合起来，生成官方的IDS DORIS网络时间序列解，并以IDS STCD（站坐标差）格式发布。