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1. WMO IOC UNEP ICSU EN GLOBAL CLIMATE OBSERVING Doc 4 2 a SYSTEM GCOS 3 11 2011 im JI l a 3rd GRUAN Implementation Session 4 wa eer Coordination Meeting ICM 3 Queenstown New Zealand 28 February 4 March 2011 Task Team 2 GNSS PW progress report 01 2011 Submitted by Kalev Rannat and June Wang Summary and Purpose of Document Progress report from the task team 2 GNSS PW covering first period till 01 2011 GRUAN ICM 3 Doc 4 2 p 2 GNSS PW TT progress report As of Feburay 3 2011 Kalev Rannat and June Wang GNSS PW TT s goal is to develop explicit guidance on hardware software and data management practices to obtain GNSS PW measurements of consistent quality at all GRUAN sites The TT was established in July 2010 The term of reference ToR was completed and approved by GRUAN management in October 2010 Until February 2011 the first 3 tasks see below defined in ToR have been the focus of the TT 1 To define GRUAN requirements for GNSS PW observations that are missing in the require ment tables in GCOS 2007 2 To document and review current status of GNSS instruments and associated data processing methods used at GRUAN sites 3 To define GRUAN requirements for a state of the art GNSS station preparing a draft docu ment on GRUAN GNSS Site Guidelines The TT was divided into 3 sub teams each concentrating on a selected topic The results obtained from the sub teams were and2. will be discussed together with all members of TT via e mails and conference calls Significant progressed have been made to all three tasks and the results will be presented at ICM3 At the TT conference call on February 1 three general issues were raised final izing solutions to the first three tasks better synchronization with the GRUAN requirements and collaborations with other task teams The TT has decided to continue working in sub teams on the rest of tasks 22
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