Evaluating Weighting Strategies in DORIS Measurement Processing for Geodetic Applications
Samuel Nahmani (IGN - IPGP, France)
Event: 2024 IDS Workshop
Session: Research activities and new applications using DORIS data, or new methods of processing DORIS data
Presentation type: Oral
DOI: 10.24400/312072/i03-2024.3919
Abstract
In the domain of geodetic measurement processing, accurately weighting observations is crucial for deriving precise and dependable geodetic estimates. This study evaluates four distinct weighting strategies for Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) measurements. These strategies include weighting based on the sine squared of elevation, the sine of elevation, the methodology developed by the French Space Geodesy Research Group (Groupe de Recherche en Géodésie Spatiale, GRGS), and the recommendations by the Precise Orbit Determination (POD) group.
Our approach involves analyzing DORIS data collected over the recent three-year span (2021-2023) utilizing the GipsyX software, in alignment with the activities of the IGN-IPGP Analysis Center, recognized as an Associate Analysis Center by the International DORIS Service (IDS). Specifically, the data processed in this study originate from Cryosat-2, Jason-3, Sentinel 3A & 3B, Sentinel 6A, and SARAL. This selection allows for the satellite-based measurement processing to facilitate the development of both mono-satellite and multi-satellite station solutions.
The objective of this research is to identify the most effective weighting strategy by assessing its impact on the residuals of observations, the coordinates of DORIS beacons, Earth Orientation Parameters (EOPs), and the stability of reference frame parameters. Our comparative analysis highlights the critical importance of selecting an appropriate weighting method to significantly enhance the accuracy of geodetic estimates. The performance of each strategy is evaluated based on its ability to minimize observational residuals and improve the precision and stability of station coordinates and reference frame parameters.
Contribution: IDS24_s4_Nahmani_EvaluatingWeightingStrategies.pdf (pdf, 6913 ko)
Corresponding author:
Samuel Nahmani
IGN - IPGP
France
