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电信和无线电工程
SJR: 0.202 SNIP: 0.2 CiteScore™: 0.23

ISSN 打印: 0040-2508
ISSN 在线: 1943-6009

卷:
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电信和无线电工程

DOI: 10.1615/TelecomRadEng.v64.i11.10
pages 889-900

Extraction of Instantaneous Frequencies from Time-Varying Bispectrum Estimates of Coherent Radar Echo Responses for Moving Objects

I. V. Kurbatov
National Aerospace University, Chkalova Str. 17, 61070, Kharkov, Ukraine
Stanislav I. Khomenko
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
V. Ye. Morozov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura Str., Kharkiv 61085, Ukraine

ABSTRACT

Coherent, homodyne, and continuous-wave radar operating with wavelengths of 3 cm, 2 cm and 8 mm has been employed for collecting the radar returns obtained from moving objects. Non-stationary, nonlinear frequency modulated and multi-component radar echo responses were analyzed and described as the sum of the Doppler frequency shifted signals (polynomial chirp-like components). Instantaneous frequencies corresponding to the radar radiation scattered from different parts of a moving extended target were extracted from the short time-varying sequences of bimagnitude estimates and mapped into the time-frequency domain. Experimental investigations of the approach demonstrate clean recovery of evolutionary phase coupled harmonics for the test targets a swinging metallic sphere, and a walking person. The obtained time-frequency distributions can be used in automatic radar target recognition systems to reveal more information with new features.


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