A radio telescope for the calibration of radio sources at 32 gigahertz

Details A radio telescope for the calibration of radio sources at 32 gigahertz A radio telescope for the calibration of radio sources at 32 gigahertz

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994tdapr.118...56g&link_type=abstract

In its The Telecommunications and Data Acquisition Report p 56-82 (SEE N95-14620 03-32)

Astronomy and Astrophysics

Astronomy

Antenna Design, Calibrating, Deep Space Network, Density Measurement, Extremely High Frequencies, Flux Density, Low Noise, Radio Sources (Astronomy), Radio Telescopes, Satellite Tracking, Signal Processing, Transistor Amplifiers, Venus (Planet), Accuracy, Ground Stations, Observatories, Positioning, Radiometers

Scientific paper

A 1.5-m-diameter radio telescope has been designed, developed, and assembled to directly measure the flux density of radio sources in the 32-GHz (Ka-band) frequency band. The main goal of the design and development was to provide a system that could yield the greatest absolute accuracy yet possible with such a system. The accuracy of the measurements have a heritage that is traceable to the National Institute of Standards and Technology. At the present time, the absolute accuracy of flux density measurements provided by this telescope system, during Venus observations at nearly closest approach to Earth, is plus or minus 5 percent, with an associated precision of plus or minus 2 percent. Combining a cooled high-electron mobility transistor low-noise amplifier, twin-beam Dicke switching antenna, and accurate positioning system resulted in a state-of-the-art system at 32 GHz. This article describes the design and performance of the system as it was delivered to the Owens Valley Radio Observatory to support direct calibrations of the strongest radio sources at Ka-band.

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