LAGEOS (LAser GEOdynamics Satellite-1) (Courtesy NASA)


image of the city of Kunming, China The 23rd International Workshop on Laser Ranging, Kunming - China, Oct.20th–26th, 2024 Release Date: 03/11/2024 The Yunnan Observatories and the International Laser Ranging Service (ILRS) are pleased to announce that the 23rd International Workshop on Laser Ranging will be held in Kunming, China during 20-26 October 2024.

image of the city of Kunming, China

More details can be found in the workshop website online with the link below:


We look forward to your participation!

Banner for the 2023 International Workshop on Laser Ranging2023 Virtual International Workshop on Laser RangingRelease Date: 09/27/2023 The 2023 Virtual International Workshop on Laser Ranging will take place during the week of October 16th-20th, 2023. This year, due to unforeseen circumstances, we are not able to hold the Specialized International Workshop on Laser Raging in Arequipa, Peru as planned. However, we do think it will be advantageous to give the community an opportunity to get together to discuss updates on pertinent topics, and exchange ideas. Sessions are being organized primarily around invited talks, but presentations on new concepts and new technologies are welcome.

The Workshop's Theme is "New Developments in Satellite Laser Ranging", and it will be focused on new materials and new results.

Program Organizing Committee:
Michael Pearlman, ILRS Central Bureau Director
Claudia Carabajal, ILRS Central Bureau Secretary
Matt Wilkinson, Networks and Engineering Standing Committee Co-Chair
José Rodriguez, Missions Standing Committee Co-Chair
Robert Sherwood, Missions Standing Committee Co-Chair
Michael Steindorfer, Space Debris Study Group Chair
Emiliano Cordelli, European Space Agency (ESA) Space Debris Study Group
Clément Courde, LLR and Transponders Standing Committee Chair
Nicholas Colmenares, LLR and Transponders Standing Committee
Stephen Merkowitz, LLR and Transponders Standing Committee
Mathis Blossfeld, Analysis Standing Committee Co-Chair
David Sarrocco, Analysis Standing Committee
Frank Lemoine, NASA ILRS Central Bureau
Jeff Dorman, NASA Networks Manager

Program topics will include Missions & Applications, New technology/Systems and Operations, Analysis, including available analysis tools, error modeling, etc., Space Debris and Lunar Laser Ranging (LLR) and Transponders.

There are no registration fees.
Participants interested in presenting should register by September 29th, 2023.
Non-Presenters' Registrations will be accepted until October 6th, 2023.

Details on the Program will be published at a later date, as the sessions are being organized. Invitations for the Virtual Sessions using Microsoft Teams will be sent to registrants.

Visit the 2023 Virtual IWLR Website for updates: https://ilrs.gsfc.nasa.gov/lw23/index.html

List of analysis centers that contributed to the SLRF2020 productThe SLR-tailored version of ITRF2020, the SLRF2020, has been released to the publicRelease Date: 07/25/2023 The long-awaited SLR-tailored version of ITRF2020, the SLRF2020, has been released to the public, along with the associated Data Handling File required for proper and accurate reduction of SLR data. Both files contain notes that are important to users, especially to those requiring the highest quality results in their work; it is imperative that users read these notes before implementing the new TRF in their production lines.

The two files can be accessed from the ILRS website pages:


CDDIS Landing pages with the appropriate DOIs are here:


Updated list of Conferences and workshops related to earth rotation, reference frames, geophysical fluids, GNSS, SLR, VLBI, DORIS, etc. posted by the IERS

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