Noncircularity of Demodulated Radar Signal

Rafał Piotr Rytel-Andrianik


The output of the quadrature demodulator is generally regarded as a complex signal that is circular if only the demodulator is well balanced. In the paper we analyze properties of quadrature demodulators, particularly digital one, and show that the output is noncircular also if the input signal is nonstationary. Then we find sources of this noncircularity and show that they stem from transients of the low-pass demodulator filter. This is quite important because nonstationary inputs are quite typical in radar where power of echoes depends strongly on range. In the first sections we also review complex random signals and properties of circularity and properness.
Author Rafał Piotr Rytel-Andrianik (FEIT / PE)
Rafał Piotr Rytel-Andrianik,,
- The Institute of Electronic Systems
Journal seriesInternational Journal of Electronics and Telecommunications, [do 2009: Electronics and Telecommunications Quarterly], ISSN 2081-8491, e-ISSN 2300-1933, [0867-6747]
Issue year2013
Keywords in Englishquadrature demodulator; complex radar signals; properness; circularity
ASJC Classification2208 Electrical and Electronic Engineering; 1705 Computer Networks and Communications
Languageen angielski
Score (nominal)15
ScoreMinisterial score = 9.0, 04-09-2019, ArticleFromJournal
Ministerial score (2013-2016) = 15.0, 04-09-2019, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2013 = 0.457
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