geodetic class gps receiver as a standard for time-critical applications

GEODETIC CLASS GPS RECEIVER AS A STANDARD FOR TIME-

CRITICAL APPLICATIONSVukan Ogrizovic1

Jadranka Marendic2

Snezana Renovica2

Sinisa Delcev1

Jelena Gucevic1

1University of Belgrade, Faculty of Civil Engineering,Department of Geodesy and Geoinformatics, Belgrade, Serbia2Directorate of Measures and Precious Metals, Belgrade, Serbia

XX IMEKO World Congress, 9-14. September 2012, BEXCO, Busan, Republic of Corea

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The scope

Civil Engineering, Geodesy and Geoinformatics Geodetic astronomy Time-keeping

time synchronization comparing local clock with UTC GPS, NTP,...

Metrological laboratory for angle and length calibration (ML160)


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Device under test

ML160 time standard Geodetic class L1/L2 receiver part of Serbian CORS network 1PPS BNC output


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Equipment

No Measuring equipment Remarks

Name Type Manufacturer S/N

1 TIC CNT-90 Pendulum 914858

2 NetRS 6609/021 Trimble 914647 Opt 70

3 Digital clock CADM Rohde-Schwartz 99.6014.02

4 Oscillo-scope


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Experiment set-up


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Phase-time diagram


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Cycle slip resolution

Sudden jump in GPS integrated phase measurements

Decreases PVT solution 16 cycle slips during 24 hours No correlation with phase-time outliers


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AVAR values


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AVAR from raw GPS data


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Conclusion and remarks

Permanent ms accuracy of time-marks Convenient for permanent monitoring of

industrial processes Microsecond accuracy (astrometry, etc.)?

not reliable could degrade positional accuracy

To discipline GPS with a rubidium clock


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Thank you

Vukan Ogrizovic, [email protected] Marendic, [email protected] Renovica, [email protected] Delcev, [email protected] Gucevic, [email protected]

The work on this paper is supported by the Ministry of Education and Science of the Republic of Serbia (Project of technological development

TR-36048)

geodetic class gps receiver as a standard for time-critical applications

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