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PAGES Enhancements

Updates to satellite antenna and receiver corrections, including orbit formats, position estimation, and antenna patterns. Compiled by experts and aligned to IGS data standards for accuracy.

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PAGES Enhancements

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  1. PAGES Enhancements Steve Hilla and Jim Rohde National Geodetic Survey 2005 Convocation October 24 – 28, 2005 Silver Spring, Maryland Holiday Inn 8777 Georgia Avenue

  2. Changes to Pages in 2004/2005 • 04/2 Correct Initialization of IERS Solid Earth Tide • 04/7 Read ANTEX files (ground and satellite antennas) • 04/9 Read SP3-a, SP3-b, and SP3-c orbit formats • 04/10 Estimate satellite antenna offsets and PCVs • 05/2 Estimate position at monument (rather than L1PC) • 05/4 Add Melbourne/Wubbena for Ambiguity Fixing • 05/7 Correct sign in pole tide model • 05/8 Update sub-daily EOP model • 05/9 Add block IIR-A, IIR-B, and IIR-M labels for ANTEX

  3. 1.3 G ANTEX VERSION / SYST A PCV TYPE / REFANT ########################################################### COMMENT Satellite antenna corrections: COMMENT - estimated from more than 10 years of IGS data COMMENT - mean of GFZ and TUM results COMMENT - solutions aligned to IGb00 COMMENT - satellite-specific z-offsets (trend-corrected to COMMENT 2000.0) COMMENT - block-specific x- and y-offsets (manufacturer COMMENT information) COMMENT - block-specific nadir-dependent patterns COMMENT - no azimuth-dependent corrections COMMENT Receiver antenna corrections: COMMENT - absolute elevation- and azimuth-dependent corrections COMMENT from robot calibrations in the field performed by COMMENT Geo++ GmbH (http://gnpcvdb.geopp.de) COMMENT - elevation-dependent corrections from relative field COMMENT calibrations performed by NGS; converted to absolute COMMENT corrections by adding COMMENT d_offset (AOAD/M_T_abs - AOAD/M_T_rel) and COMMENT d_pattern (AOAD/M_T_abs - AOAD/M_T_rel) COMMENT (http://www.ngs.noaa.gov/ANTCAL) COMMENT Compiled by Ralf Schmid (TUM), e-mail: schmid@bv.tum.de COMMENT ########################################################### COMMENT END OF HEADER START OF ANTENNA ANTEX Header

  4. ANTEX: Satellite offsets and phase patterns ########################################################### COMMENT END OF HEADER START OF ANTENNA BLOCK IIA G01 G032 1992-079A TYPE / SERIAL NO GFZ/TUM 0 20-APR-05 METH / BY / # / DATE 0.0 DAZI 0.0 14.0 1.0 ZEN1 / ZEN2 / DZEN 2 # OF FREQUENCIES 1992 11 22 0 0 0.0000000 VALID FROM IGS_05 SINEX CODE G01 START OF FREQUENCY 279.00 0.00 2201.00 NORTH / EAST / UP NOAZI -0.80 -0.90 -0.90 -0.80 -0.40 0.20 0.80 1.30 1.40 - G01 END OF FREQUENCY G02 START OF FREQUENCY 279.00 0.00 2201.00 NORTH / EAST / UP NOAZI -0.80 -0.90 -0.90 -0.80 -0.40 0.20 0.80 1.30 1.40 - G02 END OF FREQUENCY END OF ANTENNA START OF ANTENNA BLOCK II G02 G013 1989-044A TYPE / SERIAL NO

  5. START OF ANTENNA AOAD/M_T NONE TYPE / SERIAL NO ROBOT Geo++ GmbH 1 27-JAN-03 METH / BY / # / DATE 5.0 DAZI 0.0 90.0 5.0 ZEN1 / ZEN2 / DZEN 2 # OF FREQUENCIES IGS_05 SINEX CODE G01 START OF FREQUENCY 0.60 -0.46 91.24 NORTH / EAST / UP NOAZI 0.00 -0.24 -0.92 -1.97 -3.28 -4.69 -6.05 -7.19 -7.97 - 0.0 0.00 -0.28 -1.01 -2.12 -3.49 -4.95 -6.35 -7.52 -8.32 - 5.0 0.00 -0.28 -1.01 -2.12 -3.48 -4.94 -6.34 -7.50 -8.30 - 10.0 0.00 -0.28 -1.01 -2.11 -3.46 -4.92 -6.32 -7.48 -8.27 - 15.0 0.00 -0.27 -1.00 -2.10 -3.45 -4.90 -6.29 -7.46 -8.25 - 20.0 0.00 -0.27 -0.99 -2.08 -3.43 -4.88 -6.27 -7.43 -8.22 - 25.0 0.00 -0.27 -0.98 -2.07 -3.41 -4.85 -6.24 -7.39 -8.19 - 30.0 0.00 -0.26 -0.98 -2.06 -3.39 -4.83 -6.21 -7.36 -8.15 - 35.0 0.00 -0.26 -0.97 -2.04 -3.37 -4.80 -6.17 -7.32 -8.11 - 40.0 0.00 -0.26 -0.96 -2.02 -3.34 -4.77 -6.13 -7.28 -8.07 - 45.0 0.00 -0.25 -0.95 -2.01 -3.32 -4.74 -6.10 -7.24 -8.03 - 50.0 0.00 -0.25 -0.94 -1.99 -3.29 -4.70 -6.06 -7.19 -7.98 - 55.0 0.00 -0.24 -0.93 -1.97 -3.27 -4.67 -6.02 -7.15 -7.93 - 60.0 0.00 -0.24 -0.92 -1.95 -3.24 -4.64 -5.98 -7.10 -7.88 - 65.0 0.00 -0.24 -0.91 -1.94 -3.22 -4.60 -5.94 -7.06 -7.83 - 70.0 0.00 -0.23 -0.90 -1.92 -3.19 -4.57 -5.90 -7.02 -7.79 - 75.0 0.00 -0.23 -0.89 -1.91 -3.17 -4.55 -5.87 -6.98 -7.75 - 80.0 0.00 -0.23 -0.88 -1.89 -3.16 -4.53 -5.84 -6.95 -7.72 - 85.0 0.00 -0.22 -0.87 -1.88 -3.14 -4.51 -5.82 -6.93 -7.69 - 90.0 0.00 -0.22 -0.87 -1.87 -3.13 -4.49 -5.81 -6.92 -7.68 - 95.0 0.00 -0.22 -0.86 -1.87 -3.12 -4.49 -5.80 -6.91 -7.68 -

  6. END OF ANTENNA START OF ANTENNA ASH700829.3 SNOW TYPE / SERIAL NO FIELD NGS/TUM 7 11-JUL-05 METH / BY / # / DATE 0.0 DAZI 0.0 80.0 5.0 ZEN1 / ZEN2 / DZEN 2 # OF FREQUENCIES IGS_05 SINEX CODE CONVERTED FROM RELATIVE NGS ANTENNA CALIBRATIONS COMMENT G01 START OF FREQUENCY -0.60 -1.26 68.94 NORTH / EAST / UP NOAZI 0.00 1.36 2.58 3.53 4.22 4.61 4.65 4.51 4.23 - G01 END OF FREQUENCY G02 START OF FREQUENCY 0.80 -2.22 51.86 NORTH / EAST / UP NOAZI 0.00 -2.43 -4.42 -6.10 -7.52 -8.82 -9.93 -10.81 -11.55 - G02 END OF FREQUENCY END OF ANTENNA START OF ANTENNA ANTEX: 1D Ground Antenna Pattern

  7. ANTEX: Range of Satellite Offsets Range of offsets in the current IGS ANTEX file (igs_05.atx, 1994.0 to present) ------------------------------------------------------------------------------ BLOCK I (3) 210.0 0.0 1748.0 [mm] Highest 62 [mm] diff. 210.0 0.0 1686.0 Lowest BLOCK II (9) 279.0 0.0 2744.0 Highest 491 279.0 0.0 2253.0 Lowest BLOCK IIA (19) 279.0 0.0 2676.0 Highest 569 279.0 0.0 2107.0 Lowest BLOCK IIR-A (8) 0.0 0.0 1307.0 Highest 396 0.0 0.0 911.0 Lowest BLOCK IIR-B (4) 0.0 0.0 792.0 Highest 190 0.0 0.0 602.0 Lowest BLOCK IIR-M (1) 0.0 0.0 450.0 (determined using 1 wk. data)

  8. Effects of IGS implementing Absolute PCVs • IGS currently testing Absolute PCVs with parallel finals • IGb00 heights were scaled to match ITRF (VLBI & SLR) • “Antenna + radome” sites may change by few cm • IGS recommends avoiding radomes • GPS tropo estimates should now match VLBI better • Orbits should stay ~ the same due to Kepler’s Laws • IGS Clock files and hence PPP results will change due to shift in TRF scale • Regional Networks may be able to use old Relative PCVs • NEVER mix absolute and relative PCVs (for further details, see IGS Mail 5189, 17 Aug 2005)

  9. Future Work for Orbits/CORS • Improve Ocean Loading Model in site_info • Reprocess all GPS data for 1994-2005 • Iterate orbit processing for IGS early years (1994-1998) • Compare Various Integer-Fixing Techniques • Helmert Blocking software for over 800 CORS • Continue to improve models in Pages for orbits/CORS • Implement post-fit data editing • Add the N-S, E-W Ocean Loading components to Pages • Adopt ANTEX for OPUS/CORS processing • Software for mixed GPS + Galileo (+ GLONASS ?) data

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