Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199..345k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 199, Apr. 1982, p. 345-354. Research supported by the Natural Sciences
Astronomy and Astrophysics
Astronomy
2
Electromagnetic Noise Measurement, Radio Astronomy, Radio Frequency Interference, Radio Interferometers, Signal Processing, Terrestrial Radiation, Fast Fourier Transformations, Low Frequencies, Maximum Likelihood Estimates, Microcomputers, Multichannel Communication, Robustness (Mathematics), Sunspot Cycle
Scientific paper
Experimental work is described in which a 22.25-MHz interferometer provided baseband signals from which 128-channel spectra were calculated in hardware by FFT and processed by a microcomputer. Narrow-band interference was identified and excised from the in-phase and quadrature cross-spectra and the auto-spectra in a 52-kHz band in real time. The observations were performed during winter near sunspot maximum with the on-line microcomputer performing + or - 4 sigma iterative deletion of interference. Off-line, an algorithm was developed in which robust estimation was used to give protection from statistical outliers. The results showed consistently that 2-3 hr extra observing time were made possible per night.
Chute F. S.
Kasper B. L.
Routledge D.
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