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

Doppler Orbitography by Radiopositioning Integrated on Satellite (DORIS) Weekly Station Position 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 to compute weekly station position solutions for the DORIS beacons supporting the IDS network. The IDS Analysis Center Coordinator combines these individual AC solutions in a standard least-squares adjustment to generate the official IDS weekly combined station position solution.

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轨道测距综合卫星（DORIS）周站位产品。DORIS是一种由搭载于卫星上的接收器和全球分布的地面信标网络构成的二频段多普勒系统。在轨卫星上的DORIS接收器跟踪由地面信标网络发射的二频段无线电信号，并生成DORIS数据。在卫星轨道经过地面信标时，测量多普勒频移或绝对相位的改变。DORIS数据记录包含带有时标的距离-速率测量以及相关的辅助信息。国际DORIS服务（IDS）的分析中心定期检索DORIS数据，以计算支持IDS网络的DORIS信标的周站位解。IDS分析中心协调员将这些单独的分析中心解通过标准的最小二乘调整相结合，生成官方的IDS周联合站位解。