Two-dimensional direct images with a spatial FFT interferometer

Details Two-dimensional direct images with a spatial FFT interferometer Two-dimensional direct images with a spatial FFT interferometer

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46..503o&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 46, no. 5, p. 503-510

Astronomy and Astrophysics

Astronomy

5

Calibrating, Crab Nebula, Error Analysis, Fast Fourier Transformations, Image Processing, Imaging Techniques, Radio Astronomy, Radio Emission, Instrument Errors, Phase Error, Pulsars, Radio Interferometers

Scientific paper

Two-dimensional direct radio imaging was achieved at the Nyquist rate by a sixty-four-element digital interferometer. We have observed the Crab Nebula passing across the window of an image plane of 8x8 pixels as the earth rotated. The observed frequency was 10.65 GHz. Direct images were obtained by a digital lens (a 2D spatial fast Fourier transform (FFT) processor), which transforms complex amplitudes in 2D space (the electric-fields over the array antennas) to those in momentum space (k space). Using a newly developed phase-measuring technique, the instrumental phase errors were corrected before the observation. As a result, the first direct 2D images were obtained with the radio interferometer. 'Direct' means the capability to image non-ergodic (time average not equal to ensemble average) sources, such as pulsars or communication signals, of which Fourier-synthesis telescopes could not make images.

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