Astrogeo Center

Astronomy

• Results:
  • Radio Fundamental Catalogue of compact radio sources. Provides positions, maps, and estimates of the correlated flux density for over 17,000 extragalactic radio sources.
  • VLBI Calibrator search engine allows to find compact radio sources useful as a calibrator for VLBI experiments within the specified search radius of the target objects.
  • The VLBI image database of compact radio sources. It provides over 100,000 images of more than fifteen thousands active galaxy nuclei in radio waves.

• On-going and completed astronomy projects.

Space geodesy

• The Network Earth Rotation Service
• Service of crustal deformations caused by mass loading. Updated hourly. Includes mass loading caused by
  1. Ocean tides
     
  2. Non-tidal ocean bottom pressure variations
     
  3. Atmosphere pressure variations
     
  4. Land water storage changes
     
• Service of the atmospheric contribution to the geopotential.
• International Path Delay Service.
• Atmospheric angular momentum online service.
• Geodetic solutions using all VLBI observations. Provide station positions, the parameters of their motion, source coordinates, Earth orientation parameters, etc.
• Harmonic station position variations determined by VLBI.
• Empirical Earth Rotation model derived from analysis of VLBI observations.
• Harmonic variations in the Earth Rotation determined using VLBI

Software

• VLBI processing software PIMA that performs initial calibration for sampler distortion, system temperature, antenna gain, phase calibration, complex bandpass calibration and evaluate group delays, phase delay rate, group delay rate and phase of the cross-correlation.
• The VTD library of routines for computing VLBI path delay and Doppler shift with the highest accuracy.
• Software package sotid for computing displacements caused by solid Earth tides.
• Program sur_sked for scheduling VLBI experiments of astrometry survey mode.
• Library petools — a toolkit for astronomy and space geodesy software.
• Library fourpack — a set of routines that implement a convenient interface to Fast Fourier Transform libraries, perform linear filtration with the use of FFT; compute tuning parameters for FFTW.
• Library gvh — the database handler of geodetic and absolute astrometry VLBI observations.
• Package malo for computation of curstal deformation caused by mass loading.
• Package spd for computation of path delay in the neutral atmsosphere using numerical weather models.

This web page was prepared by Leonid Petrov ()
Last update: 2020.03.26_20:23:43