Propuesta metodológica para el procesamiento multisoftware de datos VLBI

Abstract

Spatial Geodesy in Colombia has traditionally been based on the exclusive use of GNSS (Global Navigation Satellite System) for its national commitments with the “Instituto Geográfico Agustín Codazzi“ (IGAC) and the “Servicio Geológico Colombiano” (SGC). However, little application of techniques such as VLBI, SLR, LLR or Doris has been identified in this context. This monograph focuses on the proposal of a methodological guide for VLBI data processing, using three main softwares: Gamit-Globk, Bernese and VieVS. The first part of the guide highlights the VieVS software, which allows high-precision processing using the Vgosdb inputs available on the IVS (International VLBI Service) platform. The products obtained include residuals, zenithal humidity delay, tropospheric gradients, pole shift parameterization, among others. VieVS stands out for its accessibility and ease of use compared to similar alternatives. Its abundant documentation and intuitive graphical interface make it a valuable tool for researchers and professionals interested in working with the VLBI technique efficiently. The second part of the guide focuses on the Gamit-Globk software, a comprehensive set of programs designed to analyze satellite navigation system (GNSS), VLBI and even Laser Ranging Ranging (SLR) measurements. Although an introduction to the basic installation and operation of the software is provided, it is noted that the lack of detailed documentation has made it difficult to perform complete processing. Nevertheless, the importance of building a solid knowledge base for future research and experimentation with this tool is emphasized. In addition, it is mentioned the possibility of performing combined VLBI and GNSS processing through the Bernese GNSS software, which allows to improve the accuracy of several parameters compared to separate processing.