Working Groups

Analysis Working Group | WG NRT DORIS data

Analysis Working Group



The Analysis Working Group (AWG) is composed of members of the Analysis Centers and Associate Analysis Centers. It is animated by the Analysis Coordination.

The AWG meets at least once a year. Presentations, minutes, agendas of the meeting are available here



Working Group "NRT DORIS data"



The IDS Governing Board created the Working Group on November, 1 2016, and appointed Denise Dettmering (DGFI-TUM) as chair.


Terms of Reference

The general objective of this working group is a thorough assessment on applications, benefits, requirements and prospects of DORIS data with improved data latency. Currently, data is available as daily RINEX files with a latency of about one day. Thus, DORIS real-time and near real-time (NRT) applications of any kind are currently only possible on board of the satellite.

Most of the other geodetic space-techniques provide their data to the users with lower latencies. The IGS disseminates its terrestrial GNSS data as hourly RINEX files and via real-time Ntrip streams. The ILRS asks its stations to provide SLR data within two hours after measurements. For data collected on board of satellites (as it is the case for DORIS) the minimum latency is restricted by the data downlink, usually performed within one to two hours after acquisition. Data sets from GPS radio occultations and satellite altimetry are available with one to three hours latency. In principle, it is also possible to provide the DORIS data with a latency of a few hours. However, this would require significant changes in operations of tools and procedures at the DORIS mission center.

DORIS NRT data sets would be useful for different applications, one of them is the modelling of the Earth's ionosphere. Using DORIS in combination with GNSS (and additional techniques) helps to improve the accuracy and reliability of ionospheric maps, especially in ocean regions with poor GNSS coverage. This has been proved for post-processing applications but will probably also hold for NRT. 


The following, non-restrictive list of goals for the WG is proposed (TBD in the WG):

  • definition of detailed NRT DORIS data requirements (latency, formats, ...)
  • conduction of simulations and/or a short-term test campaign in order to investigate the potential of DORIS NRT in ionospheric applications
  • definition of objectives and possible additional applications of NRT DORIS data,
  • investigation of possible ionospheric applications for on-board computations and telemetry downlinking (as currently done for pole coordinate estimation)
  • identification of potential users


Based on the results of the Working Group CNES may evaluate the possibility to establish a new NRT DORIS data production chain.




  Denise Dettmering (DGFI-TUM, Germany)


  Nicolas Bergeot (ROB, Belgium)

  Vince Eccles (Utah State University, USA)

  Eren Erdogan (DGFI-TUM, Germany)

  Zishen Li (CAS, China)

  Michael Schmidt (DGFI-TUM, Germany)

  Ningbo Wang (CAS, China)

  Volker Wilken (DLR, Germany)