From urs.hugentobler at aiub.unibe.ch Mon Mar 6 01:29:25 2006 From: urs.hugentobler at aiub.unibe.ch (Urs Hugentobler) Date: Mon, 06 Mar 2006 09:29:25 +0000 Subject: [IGSMAIL-5317]: IGS Workshop 8-11 May 2006: Identification and Mitigation of GNSS Errors Message-ID: <440C00F5.6020106@aiub.unibe.ch> ****************************************************************************** IGS Electronic Mail 06 Mar 01:30:50 PST 2006 Message Number 5317 ****************************************************************************** Author: Urs Hugentobler Dear Colleagues, we solicit abstracts for a session on identification and mitigation of GNSS errors at the next IGS workshop, which will be held from 8-11 May at ESOC in Darmstadt, Germany. Information about the workshop can be found in the IGS Message 5315 and at: http://www.esa.int/igs2006 Topics covered by the session include, e.g., near-field and far-field multipath effects, including local environmental effects, such as snow, trees, rain water, antenna mounting, cable connections, etc., and their correlation with geophysical signals. Such effects may average out for long observing sessions but can be very important for high time-resolved studies. Appropriate mitigation techniques are thus required. The session also addresses questions concerning improvements expected from new tidal loading models on the extraction of geophysical signals. Is there evidence of aliasing into longer-period signals? Can non-tidal loading continue to be neglected and retained in the geodetic results? Last but not least, questions concerning the quality and consistency of IGS products and future improvements fit into the session. Of particular interest are discussions on precise point positioning versus network solutions and how the IGS could serve its community better in this aspect. The session description is attached below. A short position paper and a few invited contributions will introduce the main topics of the session and highlight open questions or propose new approaches. In addition abstracts are openly solicited, and a subset will be selected for presentation. Abstracts will be selected to adequately cover the vast range of topics that are addressed in the session description. Please consider submitting a short abstract. Note that the abstract submission deadline is March 31. Thanks, Urs Hugentobler, Hans van der Marel, Tim Springer ====================================================================== Session ERRO: "Identification and Mitigation of GNSS Errors" U. Hugentobler, H. van der Marel, T. Springer Abstract. This session considers all the full range of effects that may corrupt GNSS signals or induce undesirable contributions in GNSS analysis results. We focus particular attention on those effects that may have been neglected before, are of most serious magnitude, may be particularly insidious in obscuring genuine geophysical signals (such as aliasing), or degrade the stability of the reference frame. Questions concerning the quality of IGS products and future improvements have a platform in this session, too. This includes the correlation of orbit modeling deficiencies with apparent geocenter variations or causes for persistent biases between AC products as well as further improvements of the IGS products, e.g. for applications such as precise point positioning. Of interest for users of IGS products are discussions on the procedures promising the most precise and least biased results in the vast field of applications. It is likely that significant technique-related errors (e.g. caused by near-field and far-field multipath) are sometimes being misinterpreted as geophysical effects. Therefore, it is critical that the IGS take a stronger role in identifying the sources of GNSS errors and in finding strategies to mitigate their effects. This will require new research activities to better understand some suspected error sources. All aspects of GNSS geodesy are potentially involved, from field observations through data analysis and interpretation.