0000000000373967

AUTHOR

Augusts Rubans

showing 5 related works from this author

Field tests of astrometric subsystem

2016

The paper presents results of astrometric subsystem’s functionality tests for space object laser ranging and astrometric position determination device, which is under construction in the Institute of Geodesy and Geoinformatics (GGI) of the University of Latvia. Properties of hardware performance for astrometric image acquisition were evaluated and optimal parameters have been selected. Software for image processing and calculation of instrument orientation was tested and adjustments have been made for real-time operation support. Object tracking properties were evaluated, and mount error model parameters were calculated, using test measurements.

0301 basic medicineQB275-343satellite geodesySatellite geodesybusiness.industryOrientation (computer vision)satellite laser rangingSatellite laser rangingImage processingimage processing03 medical and health sciences030104 developmental biologyGeographySoftwareGeoinformaticsgeodetic astronomyVideo trackingGeneral Earth and Planetary SciencesComputer visionArtificial intelligencebusinessGeodetic astronomyGeodesyRemote sensingGeodesy and Cartography
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Digital zenith camera for vertical deflection determination

2012

Recent accomplishments in advancement of accurate astrometric reference star catalogues, development of digital imaging technology, high accuracy tiltmeter technology, and geocentric coordinate availability provided by GNSS, have made possible accurate, fast and automated determination of vertical deflections using astrometric methods. Zenith cameras for this kind of measurements have been developed or are being developed by several research groups. The paper describes a research project by Institute of Geodesy and Geoinformation, intended to design a portable digital zenith camera for vertical deflection determination with 0.1” expected accuracy. Camera components are described, proposed d…

digital zenith cameraData processingQB275-343GNSSVertical deflectionTiltmetergeoidvertical deflectionGeodesyGeographyplumb linegeodetic astronomyGNSS applicationsGeneral Earth and Planetary SciencesZenith cameraPlumb bobGeodetic astronomyZenithGeodesyRemote sensingGeodesy and Cartography
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Digital zenith camera of the University of Latvia

2016

Design of digital zenith camera in Institute of Geodesy and Geoinformatics of the University of Latvia started in 2009. Now, after tests of a prototype, improvements of design and manufacturing of the second version, it has reached operational status. The paper describes construction of camera, features of it‘s control software. Vertical deflection determination results are discussed.

0301 basic medicineQB275-343vertical deflectionszenith cameraVertical deflectionControl softwaregeoid010502 geochemistry & geophysicsGeodesy01 natural sciences03 medical and health sciences030104 developmental biologyGeoinformaticsGeographyplumb linegeodetic astronomyGeoidGeneral Earth and Planetary SciencesZenith cameraGNSS coordinatesGeodetic astronomyPlumb bobGeodesy0105 earth and related environmental sciencesRemote sensingGeodesy and Cartography
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Performance analysis of Latvian zenith camera

2018

Since finalizing of design in 2016, the digital zenith camera of the University of Latvia was involved in a number of test observations as well as field observations at about 70 different sites. The paper presents analysis of observation results, estimation of instrument’s performance and accuracy. Random and systematic error sources are outlined. Impact of anomalous refraction on vertical deflection determination is discussed. Results of adaptation of GAIA reference star catalog for astrometric data reduction are reported.

vertical deflections010504 meteorology & atmospheric sciencesComputer scienceVertical deflectionanomalous refractiongeoid01 natural sciencesStar cataloguegeodetic astronomy0103 physical sciencesGeoidZenith camera010303 astronomy & astrophysics0105 earth and related environmental sciencesRemote sensingdigital zenith cameraQB275-343Astrophysics::Instrumentation and Methods for AstrophysicsLatvianRefractionlanguage.human_languagelanguageGeneral Earth and Planetary SciencesGeodetic astronomyGeodesyData reductionGeodesy and Cartography
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Digital Zenith Cameras Results and Its Use in DFHRS v.4.3 Software for Quasi-Geoid Determination

2017

The design of digital zenith camera was started in 2010 by Institute of Geodesy and Geoinformatics. Since then the prototype of digital zenith camera has been developed. Now, after improvements of design and manufacturing of the second version, it has reached operational status. This paper describes the construction of zenith camera and features of its control software. The results of vertical deflections' measurements are discussed. At the moment measurements are done in Riga region and are used in DFHRS v.4.3 software in order to check and improve local quasigeoid model. It is a new method of quasigeoid model determination and has not been used in Latvia before. DFHRS (Digital Finite Elem…

GeographySoftwareGeoinformaticsbusiness.industryParametric modelGeoidReference surfaceNormal heightZenith camerabusinessZenithRemote sensing2017 Baltic Geodetic Congress (BGC Geomatics)
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