An interference monitor with real-time FFT spectral analysis for a radio observatory

Details An interference monitor with real-time FFT spectral analysis for a radio observatory An interference monitor with real-time FFT spectral analysis for a radio observatory

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989itim...38..882r&link_type=abstract

IEEE Transactions on Instrumentation and Measurement (ISSN 0018-9456), vol. 38, Aug. 1989, p. 882-891. Research supported by NSE

Astronomy and Astrophysics

Astronomy

Antenna Arrays, Fast Fourier Transformations, Radio Frequency Interference, Radio Observation, Real Time Operation, Spectrum Analysis, Bandwidth, Design Analysis, Helical Antennas, Microcomputers, Radio Astronomy, Signal To Noise Ratios

Scientific paper

A system is described which uses a real-time FFT spectrum analyzer to monitor radio interference near 408 MHz occurring at a radio observatory. Direction of arrival, frequency, intensity, and time of occurrence are recorded under the control of a microcomputer. A sensitive receiver can be connected to any one of eight directional antennas to establish direction of arrival. The receiver output is digitized to 8 bits and analyzed by the FFT spectrum analyzer which has a real-time bandwidth of 0.5 MHz. A total bandwidth of 20 MHz is analyzed in segments of 0.4 MHz. The analyzer uses the modified periodogram method developed by Welch (1967), and a Kaiser-Bessel windowing function is applied to ensure low sidelobes. Dynamic range is 40 dB, and the interference monitor obtains high sensitivity to very weak interfering signals by time averaging.

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