Modulation effect and inverse synthetic aperture radar imaging of rotationally symmetric ballistic targets with precession

Author

Pan, Xiao-Yi ; Wang, W. ; Liu, Jiangchuan ; Ma, L. ; Feng, De-Jun ; Wang, Guo-Yu

Author_Institution

Coll. of Electron. Sci. & Eng., Nat. Univ. of Defense Technol., Changsha, China

Volume

7

Issue

9

fYear

2013

fDate

12/1/2013 12:00:00 AM

Firstpage

950

Lastpage

958

Abstract

The modulation effect of rotationally symmetric ballistic targets (BTs) with precession is concerned. To further approach the actual case, the modulation in amplitude and Doppler is considered in the radar backscattering and revealed by short-time Fourier transform (STFT). The results indicate that the micro-Doppler (m-D) effect induced by periodical precession is not represented as a sinusoidal modulation on the edge of BTs as usual, and the amplitude modulation may lead to discontinuity of time-frequency curve. The phenomenon in STFT is confirmed by both simulated and real data from a BT model with precession measured in the microwave anechoic chamber. Based upon the measured data, inverse synthetic aperture radar imaging results have been obtained by smoothed pseudo Wigner-Ville time-frequency distribution.

Keywords

Doppler radar; Fourier transforms; Wigner distribution; amplitude modulation; anechoic chambers (electromagnetic); backscatter; ballistics; electromagnetic wave scattering; radar imaging; synthetic aperture radar; time-frequency analysis; BT; STFT; amplitude modulation; inverse synthetic aperture radar imaging; microDoppler effect; microwave anechoic chamber; modulation effect; periodical precession; radar backscattering; rotationally symmetric ballistic target; short-time Fourier transform; sinusoidal modulation; smoothed pseudoWigner-Ville time-frequency distribution;

fLanguage

English

Journal_Title

Radar, Sonar & Navigation, IET

Publisher

iet

ISSN

1751-8784

Type

jour

DOI

10.1049/iet-rsn.2012.0322

Filename

6684219