A design study and some experiments of digital correlator backed for lambda 8-cm radioheliograph at Toyokawa

Details A design study and some experiments of digital correlator backed for lambda 8-cm radioheliograph at Toyokawa A design study and some experiments of digital correlator backed for lambda 8-cm radioheliograph at Toyokawa

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982nuria..29...47n&link_type=abstract

Nagoya University, Research Institute of Atmospherics, Proceedings, vol. 29, Mar. 1982, p. 47-60.

Computer Science

1

Correlators, Digital Systems, Radio Equipment, Spectroheliographs, Delay Lines, Design Analysis, Diffraction Patterns, Temporal Resolution

Scientific paper

The design and results of testing of a digital correlator back end intended to improve the time resolution characteristics and the dynamic range of the 8-cm wavelength radioheliograph at Toyokawa are presented. The back end frequency converts the signal transmitted from the second IF stage to a video-band signal, then amplifies it to a level acceptable to an analog/digital converter, which in turn transmits the signal through a digital delay line to a one-bit correlator to produce spatial frequency components of the solar brightness distribution which is obtained through a Fourier transformation. Tests were conducted on a circuit designed to produce the cross correlation of a pair of input analog signals using a one-bit correlator composed of an exclusive OR circuit and a synchronous counter associated with a Van Vleck correction circuit, and have shown that true visibility for the solar brightness distribution may be obtained.

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