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GPS Orbits. Jim Rohde, Bob Dulaney, Bill Kass, Steve Hilla National Geodetic Survey 2005 Convocation October 24-28, 2005 Silver Spring, Maryland Holiday Inn 8777 Georgia Avenue. Improvements to Orbit Processing in 2004/2005.

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gps orbits
GPS Orbits

Jim Rohde, Bob Dulaney, Bill Kass, Steve Hilla

National Geodetic Survey 2005 Convocation

October 24-28, 2005

Silver Spring, Maryland

Holiday Inn

8777 Georgia Avenue

improvements to orbit processing in 2004 2005
Improvements to Orbit Processing in 2004/2005
  • Stars Procedure – Added redundant baselines by processing sub-networks and combining their normal equations
  • Integer phase ambiguity fixing
  • Moved production from HP to SUN x86 platform
  • Orbit adjustment done more rigorously (ADJEPH)
  • Fixed pole tide sign error
  • Improved sub-daily EOP model
  • Absolute Antenna Phase Center Offsets and PCVs
  • Monuments as Reference Points (future)
  • Updated Ocean Tide Loading Model (future)
multiyear cors
Multiyear CORS
  • Motivation
    • To provide long-term consistent solution of all data
    • Results used for CORS coordinates and velocities – realization of NSRS
    • Implement recent improvements in GPS Data Processing
  • Time Span – 1994 through 2005
  • Reference Frame IGb00 – IGS realization of ITRF00
multiyear cors cont
Multiyear CORS (cont.)
  • Procedure
    • Streamline processing to fit with routine operations and avoid repeated reprocessing
    • Step 1: Daily Global Solution – orbits, EOPs, IGS and some CORS site positions; solutions stacked weekly for the IGS
    • Step 2: Daily CORS Solution – CORS and some North American IGS site positions; solutions stacked weekly for NAREF
    • Step 3: Daily Multiyear Solution – combination of all normal equations for orbits, EOPs, and all IGS and CORS site positions
multiyear cors cont7
Multiyear CORS (cont.)
    • Step 4: Weekly Multiyear Solution – Stack 7 daily multiyear solutions and archive results
    • Step 5: Full Multiyear solution – Stack all weeks together to solve for site velocities
  • Schedule – Begin processing January 2006, complete in 3-6 months