Co-location of space geodetics techniques in Space and on the ground

• The most demanding goal of the GlobalGeodetic Observing System (GGOS) initiative is thedefinition of station positions to an accuracy of 1 mmand the corresponding velocities to 0.1 mm/year. Fundamentalstations are core sites in this respect, becausethey collocate the geodetic relevant space techniques.However this requires unprecedented control over localties, intra- and inter-technique biases. To improvethe accuracy of the geodetic techniques, new conceptsfor the monitoring and controlling of local ties and biaseshave to be implemented.We are developing a symmetrictwo-way measurement technique to identify unaccountedsystem delays within and between the instrumentationof the Geodetic Observatory Wettzell. Itrequires redesign of the VLBI (Very Long Baseline Interferometry)phase calibration generator to be compatiblewith such an two-way measurement technique andVLBI2010. Another activity is the mapping of GlobalNavigation Satellite System (GNSS) satellites into theframe of the quasars using VLBI telescope, in geodeticmode. This corresponds to a collocation of geodetictechniques in space. The receiver of the 20 m radiotelescope Wettzell (RTW) has been modified to measurethe GNSS L1 signal without changing the physicalreference point. Preliminary experiments have alreadybeen executed.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Multidisciplinär geovetenskap (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Geosciences, Multidisciplinary (hsv//eng)

Nyckelord

GNSS with VLBI

Two-way Measurement

L-band receiver

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