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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

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Gps orbits l.jpg

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


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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)


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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


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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


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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


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