Ground-Based Doppler Orbitography by Radiopositioning Integrated on Satellite (DORIS) Data (daily files) from NASA CDDIS

Doppler Orbitography by Radiopositioning Integrated on Satellite (DORIS) Data (multi-day files) 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. The data records also contain information about any corrections that may have been applied during the processing phase, such as for the ionosphere, troposphere, and satellite center of mass, among others. Furthermore, meteorological measurements (e.g., temperature, relative humidity, ground pressure) recorded by instruments co-located with the ground-based beacons are included with the DORIS data and can be used to determine the tropospheric correction. DORIS data in RINEX format are supplied to the data center in daily files and are forwarded with a typical 1-day delay. More information about these data is available on the CDDIS website at https://cddis.nasa.gov/Data_and_Derived_Products/DORIS/DORIS_data_holdings.html.

Doppler轨道测量通过卫星无线电定位集成系统（DORIS）数据（多日文件）来自美国国家航空航天局（NASA）地壳动力学数据信息系统（CDDIS）。DORIS为一套双频多普勒系统，由搭载于卫星上的接收器和全球分布的地面信标网络组成。在轨道运行的卫星上的DORIS接收器追踪由地面信标网络发出的双频无线电信号，并生成DORIS数据。当卫星的轨道跨越地面信标时，测量的是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。数据记录还包含在处理阶段可能应用的任何修正信息，例如对电离层、对流层和卫星质心的修正等。此外，与地面信标共定位的仪器记录的气象测量数据（例如，温度、相对湿度、地面压力）亦包含在DORIS数据中，并可用来确定对流层校正。RINEX格式的DORIS数据以每日文件的形式提供至数据中心，并通常存在1天的延迟。有关这些数据的更多信息，可在CDDIS网站上找到，网址为https://cddis.nasa.gov/Data_and_Derived_Products/DORIS/DORIS_data_holdings.html。