Ground-Based Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) Station Position Product for Precise Orbit Determination from NASA CDDIS

Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) Station Position Product for Precise Orbit Determination 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 station position solutions for the DORIS beacons supporting the IDS network. The IDS Analysis Center Coordinator combines these solutions to produce an official IDS product. This DPOD (DORIS extension of the ITRF for Precise Orbit Determination) solution is a set of coordinates and velocities of all the DORIS tracking stations for Precise Orbit Determination (POD) applications. The combined solution is generated in conjunction with official determination of the International Terrestrial Reference Frame. DPOD solutions are available in SINEX format.

Doppler轨道学及卫星无线电定位集成（DORIS）站位置产品，用于从美国国家航空航天局地壳动力学数据信息系统（CDDIS）进行精确轨道确定。DORIS为一套双频多普勒系统，由搭载在卫星上的接收机和全球分布的地面信标网络构成。卫星上的DORIS接收机追踪地面信标网络传输的双频无线电信号，并生成DORIS数据。在卫星轨道跨越地面信标时，测量多普勒频移或绝对相位。DORIS数据记录包含带有相关辅助信息的时标距离率测量。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，以计算支持IDS网络的DORIS信标的站位置解决方案。IDS分析中心协调员将这些解决方案合并，生成官方IDS产品。此DPOD（精确轨道确定中DORIS对国际地球参考框架ITRF的扩展）解决方案是一组用于精确轨道确定（POD）应用的DORIS跟踪站的坐标和速度。该综合解决方案与国际地球参考框架的官方确定同步生成。DPOD解决方案以SINEX格式提供。