Date: Wed, 14 Jun 2000 17:38:24 -0700 (PDT) From: Robert F Meyer Message-Id: <200006150038.RAA04768@kalman.jpl.nasa.gov> To: IGSREPORT@IGSCB.JPL.NASA.GOV, SCIGN@IGSCB.JPL.NASA.GOV Subject: [SCIGN-781] JPL GNAAC Analysis Report: New Format and <7 ACs Sender: owner-scign Precedence: bulk ****************************************************************************** SCIGN Electronic Mail 14 Jun 17:38:30 PDT 2000 Message Number 781 ****************************************************************************** Author: R F Meyer ****************************************************************************** NEW GNAAC COMPARISON FROM JPL FOR GPS WEEK(S) 1062, 1063, 1064++ 14-JUNE-2000 ****************************************************************************** R F Meyer (Raytheon, Pasadena, CA); M B Heflin, J F Zumberge, D C Jefferson, M M Watkins, F H Webb (Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA) **NOTE: 1) Only 6 of the 7 Analysis Centers [AC] are available. SIO is missing. Solutions in SINEX format, if available, are obtained from: COD, EMR, ESA, GFZ, JPL, NGS, SIO. For weeks: 1062, 1063, 1064, the SIO SINEX solutions were not available. This is reflected in the tabular output and typically results in less sites in common. 2) For weeks 1062 and later, a new output format is reported. The format now includes one more significant figure for each of the North, East and Vertical WRMS values (NEV) in millimeters [mm]. The tabular format is now three lines per AC. The first line is WRMS N [mm] and WRMS E [mm]. The second, WRMS V [mm] and the third line indicates the number of sites in common for the combined or site-wise pair. [an example for GPS week 1062 is shown]. Each center was compared to each other center by estimating a 7-parameter Helmert transformation to minimize the least-squares coordinate residuals. The following table summarizes comparison results. The North, East, and Vertical WRMS values are given in mm for each pair. The number of common sites is given directly underneath the values for WRMS. The number underneath each center's name is the scale factor applied to the formal errors from that center. Transformation parameters for each pair are given at the end of the report. We also compute a free-network combination of solutions from all centers. Each solution is scaled and edited according to the results of pairwise comparisons. Then all free-network solutions are rigorously combined using their full covariance matrices. Sites common to all solutions are used to compare individual solutions with the combination and residuals are given in the first row of the comparison table. Example: Week 1062 N [mm.m] E [mm.m] V [mm.m] common sites TABLE OF COMPARISON RESIDUALS (N E V in mm) -----------+---------+---------+---------+---------+---------+ cod emr esa gfz jpl ngs c+---------+---------+---------+---------+---------+---------+ o| 2.1 2.0| 2.6 3.0| 2.4 3.6| 1.5 1.7| 1.1 1.6| 3.9 5.5| m| 9.2 | 4.1 | 10.2 | 4.0 | 4.5 | 6.7 | b+ 13 | 13 | 13 | 13 | 13 | 13 | ++---------+---------+---------+---------+---------+---------+ cod | 6.0 4.4| 2.4 3.9| 3.8 3.5| 3.9 3.2| 5.6 6.2| | 11.5 | 12.6 | 12.2 | 13.3 | 11.2 | 15.0 | 35 | 42 | 55 | 58 | 58 | +---------+---------+---------+---------+---------+ emr | 5.9 6.3| 3.4 5.4| 3.0 4.3| 5.4 8.2| | 12.2 | 6.6 | 5.1 | 9.3 | 5.0 | 28 | 26 | 32 | 32 | +---------+---------+---------+---------+ esa | 4.5 4.2| 3.6 4.6| 6.7 7.3| | 7.1 | 11.1 | 13.4 | 8.0 | 31 | 36 | 45 | +---------+---------+---------+ gfz | 2.1 2.3| 5.0 7.3| | 7.5 | 8.9 | 14.0 | 42 | 46 | +---------+---------+ jpl | 5.4 7.1| | 8.7 | 4.0 | 46 | +---------+ ngs 13.0