GNSS Absolute Antenna Calibration at the PowerPoint Presentation, PPT - DocSlides

GNSS Absolute Antenna Calibration at the PowerPoint Presentation, PPT - DocSlides

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National Geodetic Survey. Andria . Bilich. & Gerald . Mader. Geosciences Research Division. National Geodetic Survey. With contributions from. :. Steven . Breidenbach. , Hong Chen, . Kendall . Fancher. ID: 180876

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Presentations text content in GNSS Absolute Antenna Calibration at the

Slide1

GNSS Absolute Antenna Calibration at theNational Geodetic Survey

Andria

Bilich

& Gerald

Mader

Geosciences Research Division

National Geodetic Survey

With contributions from

:

Steven

Breidenbach

, Hong Chen,

Kendall

Fancher

, Charles

Geoghegan

,

David

Gietka

,

Heeyul

Han, Dennis

Lokken

,

Frank Marion, Jaya

Neti

,

Jarir

Saleh

Slide2

Outline

MotivationNGS methods and observation modelsExample resultsNGS Calibration Services

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2

Slide3

Where do I receive the signal?

Antenna reference point (ARP)

Antenna element

Nonphysical and inconstant point floating in space?

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Slide4

What is GNSS Antenna Calibration?

Create a “map” of antenna characteristicsMean point being positioned (PC0)Spatial variations (PCV)

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4

PC0

[ENU]

PCV(el)

PCV

(

az,el)

Slide5

What Is The Effect of PC0/PCV?

Antenna element introduces elevation- (and azimuth-) dependent advance/delay to the carrier phase observation = PC0 + PCVEffect on heights (with respect to elevation cutoff)Alias into troposphere estimate<= 10cm height errors on mixed-antenna baselinesMixed-antenna and longer baselines demand good antenna calibrationsPublished values are idealized (environment-free)

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Slide6

NGS Motivations and Goals

Serve high precision needs of U.S. surveying and geodesy communitiesSimultaneous multi-freq, multi-GNSS calibrations2-D (elevation, azimuth) phase center patternsFree calibration service w/ quick turn-aroundCalibration values publicly distributed via InternetCompatibility with IGS ANTEX values

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Slide7

NGS Calibration Facility and Methods

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Slide8

Calibration Setup

Single differencesShort baseline (5 m)Simplified multipath environmentCommon clock (heading receiver)Remaining factors = phase centers (ref, test), differential multipath, hardware bias

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Time Difference of Single Differences

Closely spaced time pairs + robot motion = PC0/PCV at reference antenna removedslowly varying biases (differential MP, hardware bias) minimized

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Fixed reference antenna

Test antenna

Slide10

Why Robot?

Introduce angle changes for TDSD

Better spatial coverage

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Slide11

Modelled Factors

E

N

V

PC0 [ENU]

PCV (

az,el

)

A priori

position

Frame rotation(s) between robot and local frame

Rotation arm length

Phase windup (antenna motion)

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Slide12

NGS Calibration Results

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mm

Slide13

Trimble Zephyr Geodetic 2(TRM55971.00)

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(mm)

North

EastUp IGS1.07-0.1967.17302126611.38-0.4569.84302127160.92-0.4769.84

Slide14

TRM55971.00phase center pattern

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mm

mm

Slide15

Deviation from IGS type mean

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mm

Slide16

Ashtech

Geodetic III ‘Whopper’(ASH700718B)

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(mm)

North

East

Up

IGS

-1.67

-0.47

69.48

11885

-1.22

0.22

69.13

11869

-1.40

0.23

69.17

Slide17

ASH700718Bphase center pattern

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mm

mm

Slide18

Deviation from IGS type mean

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mm

mm

mm

Slide19

NGS Calibration Services

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Slide20

PC0/PCV Distribution

Freely availableDistribution via website: http://www.ngs.noaa.gov/ANTCAL

Data formats for different software:NGS format (relative and absolute)ANTEX (absolute)

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Slide21

NGS Calibration Services

Formal policy documentCalibration process and stagesEligibility for calibrationRights and responsibilitiesRequest calibration via web formTracking system with automated customer notification emails

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Slide22

Conclusions and Outlook

Good agreement with IGS type meansPending approval from International GNSS Service (IGS)Soon to be “open for business”For more informationhttp://www.ngs.noaa.gov/ANTCALEmail andria.bilich@noaa.gov or NGS.AbsAntCal@noaa.gov

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