Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986rpspr.......83r&link_type=abstract
In its USSR Report: Space (JPRS-USP-86-001) p 83 (SEE N86-20178 10-88) Transl. into ENGLISH from Astronomicheskiy Zhurnal (Mo
Astronomy and Astrophysics
Astronomy
Radar Astronomy, Space Based Radar, Stars, Antenna Arrays, Noise Temperature
Scientific paper
There is no fundamental reason why radar cannot be used in investigations of star systems. In order to detect star systems by radar it is necessary to construct an antenna with a diameter of several tens of kilometers and a transmitter whose power is commensurable with the power of all electric power stations on the Earth. Such an antenna should be in outer space in order to avoid the influence of radio ray refraction in the Earth's troposphere and to to give rise to radio noise. At present the construction of such a radar apparatus may seem incredible, but there are no fundamentally insoluble problems. The closest stars are 10,000 times more distant from the Sun than Pluto. In order to make successful radar observations of star systems there would have to be the same jump in energy potential as with the transition from radar observations of the Moon to radar observations of Pluto. If the rates of increase in energy potential persist, radar observations of star systems will become realistic by the middle of the 21st century. A system for interstellar communication having a receiving antenna with an effective area of 2 x 10 to the 9th power square meters operating at a wavelength of 3 cm with a receiver noise temperature of 10 K can ensure transmission of a television signal from a distance of 4.34 light years with use at the transmitting end of an antenna with a diameter of 10 m and a transmitter with a power of 1 million W. Radar observations of star systems will open the way to interstellar ships in the same way that radar observations of planets in the solar system opened the way for the interplanetary stations.
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