Influence of using individual GPS receiver antenna ... · GA was recognized/approved by IGS antenna...
Transcript of Influence of using individual GPS receiver antenna ... · GA was recognized/approved by IGS antenna...
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Influence of using individual GPS receiver antenna calibrations
on high precision geodetic positioning, case study: Northern
Surat Basin Queensland 2015 GPS campaign
IGNSS 2016, Sydney, 6 – 8 December 2016
Guorong Hu & Michael Moore
Geodesy Section, Geoscience Australia
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GNSS antenna types
GNSS antenna
Satellite antenna
Block I Block II, IIA, ….
Receiver antenna
Single frequency (mobile phone, low cost GNSS
receiver antenna)
Dual frequency (high precision
geodetic receiver antenna)
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Basic concepts
ARP (Antenna Reference Point)
GNSS satellite
antenna
Zenith
Mean Phase Centre
PCO: Phase Centre Offset, given in NEU components relative to the ARP
PCV: Phase Centre Variation, variation of the actual phase centre with the direction of
the arrival of the signal, provided as a function of elevation angle and/or azimuth angle
in antenna frame
NRP: North Reference Point, the NRP should be properly oriented to true north for
antenna calibration
GNSS receiver
antenna
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Relative calibration: Phase centre determinations from a
stationary test pier referenced to a standard (Dorne Margolin
choke ring antenna, type T: AOAD/M_T)
Absolute calibration: calibration where PCO/PCV are
independent of the reference antenna
Individual calibration: calibration values which are specific
to the antenna serial number
IGS type mean calibration: calibration values for an antenna
model, where several test samples are separately calibrated
and averaged together by IGS antenna working group
GA type mean calibration ……
Basic concepts
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Relative antenna calibration: 30 June 1996 ~ Nov. 2006
Absolute antenna calibration: Nov. 2006 ~ present
Calibration facilities officially recognized by IGS:
GA, Geo++, NGS, Univ. Hannover, Univ. Bonn
GA was recognized/approved by IGS antenna working group
announced in IGS workshop 2016 in Sydney, Feb 2016
History of antenna calibration of IGS products
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Systematic errors caused by assumptions of relative PCVs:
PCV(AOAD/M_T)=0 & PCV(GNSS sat. antenna)=0
Why relative PCVs to absolute PCVs
Independent from reference antenna
High resolution and precision PCVs
Site and location independent
Advantages of absolute antenna calibration
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Two absolute calibration methods:
Anechoic chamber calibration: using
artificial GPS signals
Robotic calibration: using real GPS
signals
Absolute GNSS antenna calibration method
Credit: University of Bonn
GA’s robotic ACF
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Impact on GPS solutions including:
Terrestrial scale (global solutions)
Station coordinates
Orbit parameters
Troposphere parameters
Why antenna calibration matter
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Findings of experiment by IGS Antenna WG on reprocessed
global solutions of ~ 200 stations data from 1994 to 2005:
Credit: Schmid et al., 2005
PCVs model impacts on global GNSS solutions
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~ 25 different antenna types
~ 145 individual antennas
> 400 individual calibrations
Individual calibrated antenna PCV can be accessed at:
ftp://ftp.ga.gov.au/geodesy-outgoing/gnss/products/antenna/
Antennas calibrated at GA as of November 2016
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Case study: comparison position impact of using
IGS-type mean and individual PCV models
Data source: Northern Surat Basin QLD Campaign 2015
Stations: 65
Antenna types used: 4 (TRM57971.00, TRM55971.00,TPSG3_A1, and
LEIAR10)
Observed days: 20 days, 15-28 Sept and 13-18 Oct 2016
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Antennas for Surat QLD 2015 GPS campaign
TRM57971.00 NONE (L1)
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Antennas for Surat QLD 2015 GPS campaign
TRM57971.00 NONE (L2)
Significant difference
among different
antennae in terms of
serial numbers
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Antennas for Surat QLD 2015 GPS campaign
TPSG3_A1 NONE (L1)
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Antennas for Surat QLD 2015 GPS campaign
TPSG3_A1 NONE (L2)
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Antennas for Surat QLD 2015 GPS campaign
LEIAR10 NONE (L1)
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Antennas for Surat QLD 2015 GPS campaign
LEIAR10 NONE (L2)
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Position differences between using IGS-type mean
and individual PCV models
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TRM57971.00 NONE antenna better agreement with IGS type
mean
Maximum position difference is 20.9 mm in vertical
component of site SB56, which is TPSG3_A1 NONE antenna
Horizontal component position differences are within 3 mm
Large position differences for vertical component but
correlates with antenna type
Findings from the comparison between IGS type
mean and individual PCV
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• Should we give up IGS type mean PCV and use individual
PCV models?
• Suggestions: use IGS type mean PCV for IGS stations which
will keep consistency with IGS products and use individual
PCV as many as possible for other non-IGS stations
Discussions
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Phone: +61 2 6249 9884
Web: www.ga.gov.au
Email: [email protected]
Address: Cnr Jerrabomberra Avenue and Hindmarsh Drive, Symonston ACT 2609
Postal Address: GPO Box 378, Canberra ACT 2601
Questions?
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Special Case: Damaged Antenna –
ASH701945E_M__NONE (L2)
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Special case: damaged antenna –
ASH701945E_M__NONE (L1)
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Repeatability of PCV for reference antenna
TRM59800.00 NONE (L2)
L2 dPCV < 2 mm
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Repeatability of PCVs for reference antenna
TRM59800.00 NONE (L1)
L1 dPCV < 1.5 mm
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Individual antennas – TRM59800.00__NONE (L1)
Significant difference
among different
antennas in terms of
serial numbers
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Individual antennas – TRM59800.00__NONE (L2)
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Individual antennas – TRM29659.00__NONE (L1)
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Individual antennas – TRM29659.00__NONE (L2)
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First ever robot calibrated antenna:
ASH701945.B__NONE (L1)
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First ever robot calibrated antenna:
ASH701945.B__NONE (L2)
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Individual antennas – TRM57971.00__NONE (L1)
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Individual antennas – TRM57971.00__NONE (L2)
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Not all GNSS satellite antenna are luckily calibrated
Estimation of satellite antenna corrections from IGS re-
processing campaign using global GNSS data
Satellite antenna calibration method
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GA robotic GNSS antenna calibration operational since 2014
Several antennas previously did not have robot calibrations
Summary and conclusions
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Why we need to do antenna calibrations
Antenna calibration history
GA’s antenna calibration facility (ACF)
Impact on estimated station position when using individual
PCVs
Summary and discussions
Overview
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Credit: www.ngs.noaa.gov