Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aj....126.1588z&link_type=abstract
The Astronomical Journal, Volume 126, Issue 3, pp. 1588-1594.
Astronomy and Astrophysics
Astronomy
4
Methods: Data Analysis
Scientific paper
Only a small fraction of the radio spectrum can be reserved exclusively for passive scientific measurements, so radio astronomers must expect to observe some natural radiation at frequencies allocated to an increasing number of active users of the spectrum. This paper presents a scheme for removing pulsed transmissions of air surveillance radar from astronomical data based on the temporal and amplitude characteristics of the radar signals. Two filter schemes for maximizing the separation of the radar signals from normally distributed noise are compared on the same real data. The goal is to remove as little of the useful data as possible. Removal of both strong- and weak-signal interference to the level of detectability in a 5 s integration and a scheme for compensating for the frequency dependence of the excision algorithm are demonstrated.
Bradley Richard
Fisher Richard J.
Wilson Stephen G.
Zhang Qing
Zheng Yibin
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