IGS Analysis Center Workshop - IGS - NASA

SUMMARY OF SESSION 3This Session began with Geoff Blewitt’s observation that, before Standards for Processing can bedeveloped, we must first gather information on Analysis Center models, estimation strategies,nominal coordinates, and so on, so that commonality and differences can be seen and analyzed. Healso spent some time putting together a preliminary list of what would constitute such“information”. Geoff Blewitt volunteered to develop, in cooperation with the Central Bureau, aformal questionnaire to be filled out by Analysis Centers. The purpose of the questionnaire will beto systematically document differences and changes in the hope that these may be related todifferences in solutions. A draft questionnaire will be made for review by Analysis Centers, and afinal version will be distributed to each Center to fill out. Completed questionnaires will be madeavailable to all Centers, IERS, and will be available on the IGS Information system beingimplemented at the Central Bureau.All Centers agreed in principle to adopt the same set of fiducial coordinates for purposes of orbit/EOP products. The proposed list of stations is the same as in Session 1.60