Ground-Based Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) Earth Orientation Parameters Time Series Product from NASA CDDIS

Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) Earth Orientation Parameters 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 to compute various DORIS products from data generated by the DORIS beacons supporting the IDS network, including the time series of Earth orientation parameters (EOPs). The IDS Analysis Center Coordinator combines these solutions to produce an official IDS EOP product. The EOP time series are available in text format.

Doppler 轨道测量与卫星无线电定位综合系统（DORIS）地球定向参数时间序列产品，源自美国宇航局地壳动力学数据信息系统（CDDIS）。DORIS 系统为一套双频 Doppler 系统，由搭载在卫星上的接收器和全球分布的地面信标网络组成。在轨卫星上的 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。通过对卫星轨道移动过程中地面信标进行的多普勒频移或绝对相位的测量，获得带有相关辅助信息的时标距离率测量。DORIS 数据记录包含时标距离率测量及其相关辅助信息。全球网络中的 DORIS 观测可用于多种产品。国际 DORIS 服务（IDS）的分析中心定期检索 DORIS 数据，以计算由支持 IDS 网络的 DORIS 信标生成的各种 DORIS 产品，包括地球定向参数（EOP）的时间序列。IDS 分析中心协调员将这些解决方案合并，以生成官方的 IDS EOP 产品。EOP 时间序列以文本格式提供。