Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997abos.conf..735w&link_type=abstract
Conference Paper, Astronomical and Biochemical Origins and the Search for Life in the Universe, IAU Colloquium 161, Publisher: B
Astronomy and Astrophysics
Astronomy
Project Seti, Radio Telescopes, Parabolic Antennas, Phased Arrays, Design Analysis, Radio Astronomy, Spectral Sensitivity, International Cooperation
Scientific paper
SETI searches, as well as radioastronomy, requires large radiotelescopes for high sensitivity. In recent years a strong scientific case has been made for the construction of a radiotelescope operating at decimeter wavelengths with an aperture of about 1 sq km. Such an instrument would have a sensitivity about two orders of magnitude greater than is currently available. However, current projections indicate that this will require about an order of magnitude reduction in cost per unit area compared to existing structures in order to make it financially feasible. This reduction will demand new and innovative approaches in design. Even with this reduction in capital cost, such a facility is expected to be several hundred million dollars. Such a major facility will need to be developed as an international project. The international Radio Science Union (URSI) and the International Astronomical Union (IAU) have recognized this and set up a joint Working Group to facilitate the development. Several different design approaches are currently being studied. These vary from a small number of large spherical radiotelescopes, through a moderate number of medium-sized parabolic antennae, to a phased array of a large number of small nonmoving 'tiles'. Each approach has advantages, disadvantages, and particular challenges.
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