Computer Science – Performance
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46l..33k&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 46, no. 2, p. L33-L36
Computer Science
Performance
12
Antenna Arrays, Calibrating, Dynamic Range, Error Analysis, Image Processing, Imaging Techniques, Instrument Errors, Performance, Radio Astronomy, Radio Interferometers, Solar Observatories, Spectroheliographs, Correlators, Cross Correlation, Fourier Transformation, Pointing Control Systems, Radio Antennas
Scientific paper
The Nobeyama Radioheliograph is a radio interferometer dedicated to solar observations at 17 GHz. Its imaging performance is concisely described on the basis of the correlator outputs. Antenna-based errors are removed by a self-calibration method. Possible causes of correlator-based errors have been considered, respectively. Among them, the important factors are: (1) unequal bandpass characteristics, (2) antenna pointing errors, (3) delay errors, and (4) noise at correlator outputs. The expected dynamic range of synthesized snap-shot images is 30 dB based on these correlator-based errors. However, the actual images have a 25 dB dynamic range, which may be mostly due to the image-restoration procedure currently adopted.
Bushimata Takeshi
Enome Shinzo
Hanaoka Yoichiro
Irimajiri Yoshihisa
Kawashima Susumu
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