PAGES Enhancements

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
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_at_bv.tum.de COMMENT

COMMENT
END OF HEADER
START
OF ANTENNA
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
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
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 Keplers
  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