# Presentation: 448071

## PAGES Enhancements

**Steve Hilla and Jim Rohde**
- National Geodetic Survey 2005 Convocation
- October 24 – 28, 2005
- Silver Spring, Maryland
- Holiday Inn
- 8777 Georgia Avenue

## 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**

## ANTEX Header

-       **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: 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**

##                                                             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 -**
**   **

## ANTEX:  1D Ground Antenna Pattern

-                                                                        **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: 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)**

## 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)

## 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**