Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007basi...35..619d&link_type=abstract
Bulletin of the Astronomical Society of India, Vol. 35, p. 619-624
Astronomy and Astrophysics
Astronomy
Plasmas, Data Analysis, Radar Astronomy
Scientific paper
Radars have been used extensively for ionospheric studies. In an ionospheric radar measurement one usually implements different types of codes and the choice largely depends on the geophysical phenomenon under investigation. As a result many kinds of coding and decoding methods have been used including binary phase codes. In ionospheric physics the performance of binary phase codes are usually investigated in terms of spatial and temporal resolution. This is done usually by employing a matched filter, which creates unwanted side lobes at the output of the receiver. These side lobes can be eliminated by using a mismatched filter. But there is an associated loss in signal-to-noise ratio (snr). In this paper we have presented long optimal binary phase code-mismatched filter pairs that may be used in several applications including ionospheric radar measurements. This was done by investigating 1.04 × 10^{9} number of binary phase codes.
Damtie Baylie
Lehtinen Markku
Orisp Mikko
Vierinen Juha
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