From Jan Sat Mar 27 10:06:50 1993 From: Jan (Jan) Date: 27 MAR 1993 10:06:50 Subject: [IGSREPORT-186] EMR Analysis Report (week 688) Message-ID: *********************************************************************** IGS Electronic Report 27-MAR-1993 10:06:50 Message Number 186 *********************************************************************** From: Jan Kouba Subj: EMR Analysis Report (week 688) -------------------------------------- Subject: Geodetic Survey Division (GSD), SMRSS, EMR analysis results for the GPS week # 688 (Mar.14-Mar.20, 1993) Submitted by: J. Kouba **, P. Tetreault, R. Ferland, F. Lahaye, P. Heroux, L. Mancuso Geodetic Survey Division (GSD), Surveys Mapping & Remote Sensing Sector (SMRS), Energy Mines and Resources (EMR), 615 Booth Str., Ottawa, K1A 0E9 ** on secondment to the Geodetic Survey from the Geophysics Div. Geological Survey of Canada (GSC), EMR, 1 Observatory Crescent, Ottawa, K1A 0Y3 Our analysis utilizes the JPL GIPSY/OASIS II (UNIX) software system and data from all (up to 7) Canadian stations augmented by up to 12, globally distributed, core stations (see Table 1 for the list of stations). This effort is a part of a joint pilot project to test the so called "Active Control System" in Canada and involves the Geodetic Survey Division (GSD), SMRSS, the Geophysics Division and Pacific Geoscience Centre of the Geological Survey of Canada, all three institutions are part of the Department of Energy, Mines & Resources (EMR). Table 1 : Station Summary (also indicated are day no. for which a particular station is not included in the daily solution, either due to being down or data being late). STATION IGS code MISSING DAY NO. 1993 Albert Head, CAN ALBH Algonquin, CAN ALGO* Fairbanks FAIR* 074 Goldstone GOLD* Hartebeesthoek HART* Holberg,CAN HOLB Kokee Park KOKB Madrid MADR* McMurdo MCMU* 074 to 079 Pamatai PAMA 075 to 079 Penticton, CAN DRAO Santiago SANT* St. Johns, CAN STJO Canbera TIDB* Tromsoe TROM* Wettzell WETT* Yarragadee YAR1* Yellowknife, CAN YELL* * indicates constrained stations, remaining are solved for (50m apriori sig.) SOLUTION CHARACTERISTICS Reference frame and orientation: Nominally ITRF91, at epoch 1992.5 is realized by constraining up to 11 of the above stations at the IGS coordinates (see IGS message #90). Orientation is realized through the above coordinates and, once a week, the fixed DUT1 values from the current NEOS/IERS (Bull. A). Constants and models: - no change, see the IGS mess. #101 for details. Estimation strategies: - no change, see the IGS mess. #101 for details - , except for the estimation of DUT1, stochastic orbit modeling, new weighting of L3,P3, see IGS mess. #130. ALGO was used as time reference. Aposteriori variance factors typically are between 0.5 and 1.0 (noise about 3mm and 200mm for phase and smoothed pseudorange observations, resp.). PRODUCTS GENERATED: The following products are generated and uploaded into CDDIS @ NASA/GSFC EMR06883.EPH GPS ephem. for week # 688 in sp3 format EMR06885.EPH GPS ephem. for week # 688 (without PRN18) in sp3 format EMR06887.EPH GPS ephem. for week # 688 in sp3 format EMR06887.ERP pole x,y and DUT1 solutions for week # 688 EMR06887.SUM name of this text summary file REMARKS on EMR's products: 1. ALGO hydrogen maser used as a time reference. In the sp3 EPH file sat. epochs with no reference (e.g. ALGO not observing a satellite) have a value of 99999. microseconds. ALGO clock error & drift were about -350ns (49052) & -45 ns/day w.r.t. GPS time. 2. MCMU was excluded from processing, due to non-availability (data problems). 3. PRN18 was excluded in final processing this week on Mar.17/18. -- Jan Kouba Geodetic Survey of Canada Ottawa, Ontario, Canada Internet: kouba at geod.emr.ca