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Syllabus for

Academic year
ERR170 - Interferometry for astronomy and geodesy
 
Owner: RAMAS
3,0 Credits (ECTS 4,5)
Grading: TH - Five, Four, Three, Not passed
Level: A
Department: 75 - EARTH AND SPACE SCIENCES


Teaching language: English

Course module   Credit distribution   Examination dates
Sp1 Sp2 Sp3 Sp4 No Sp
0102 Examination 3,0 c Grading: TH   3,0 c   28 May 2007 pm V,  17 Jan 2007 am V,  20 Aug 2007 am V

In programs

TTFYA ENGINEERING PHYSICS, Year 4 (elective)
RAMAS MSc PROGRAMME IN ADVANCED TECHNIQUES IN RADIO ASTRONOMY AND SPACE SCIENCE, Year 1 (compulsory)
TELTA ELECTRICAL ENGINEERING, Year 4 (elective)

Examiner:

Bitr professor  Johan Mellqvist
Professor  John Conway
Bitr professor  Rüdiger Haas



Eligibility:

For single subject courses within Chalmers programmes the same eligibility requirements apply, as to the programme(s) that the course is part of.

Aim

Interferometry is a technique of combining data from several radio antenna together to achieve high resolution imaging or accurate astrometry and position finding. This course principly deals with interferometry as applied to radio and millimetre astronomical imaging, and VLBI geodesy. The subjects of optical interferomtry and Synthetic Aperture Radar are also briefly discussed.

Goal

At the end of the course students should understand the fundamental principles of interferometry and be able to analyse and use data from interferometers. They should also be able to design the major parameter of a new interferometer system.

Content

We first present the simple
2-element interferometer discussing the relationship between source
structure and position and the interferometry measurements. The
main technical elements of an interferometer system are presented
including digital sampling, correlator and delay model. The concepts
of antenna arrays and aperture synthesis are then developed.
Arrays from astronomy such as the VLA (Very Large Array)
and future millimetre wave imaging instruments are given as
examples, as are global geodetic VLBI networks. . Data analysis methods for
interferometry data are fully covered. These include
geodetic analysis and geometrical modelling for geodesy and
deconvolution methods (such as Maximum Entropy) for imaging.
Methods of removing atmospheric and ionospheric phase distortions
including dual frequency observations, Kalman filtering,
self-calibration and phase-referencing are also presented.

EXAMINERS: John Conway & Rüdiger Haas

Organisation

The course will consist of lectures, problem/exercise classes. The
course teachers will give 14 lectures covering the following specific
areas.

Introduction. The Two element interferometer. Interferometer arrays.
Imaging and Deconvolution (parts 1 and 2). Propogation effects.
Interferometer Engineering. Very Long Baseline Interferomtry.
Spectral line Interferometry. Millimetre interferometry and ALMA.
Geodesy and Astrometry. Geodetic data reduction. Optical Interferometry.

In addition to the above lectures there will be exercise classes where the students
do both astronomical and geodetic data reduction
and a couple of problem
classes where assignments are reviewed.

Literature

Compendium (Chalmers) and lecture notes

Examination

A final written exam gives 100% of the points. In addition studends must attend
the example/exercise classes to pass the course.


Page manager Published: Thu 03 Nov 2022.