Joint time-frequency transform for radar range-Doppler imaging

Author

Chen, Victor C. ; Qian, Shie

Author_Institution

Radar Div., Naval Res. Lab., Washington, DC, USA

Volume

34

Issue

2

fYear

1998

fDate

4/1/1998 12:00:00 AM

Firstpage

486

Lastpage

499

Abstract

Conventional radar imaging uses the Fourier transform to retrieve Doppler information. However, due to the complex motion of a target, the Doppler frequency shifts are actually time-varying. By using the Fourier transform, the Doppler spectrum becomes smeared and the image is blurred. Without resorting to sophisticated motion compensation algorithms, the image blurring problem can be resolved with the joint time-frequency transform. High-resolution time-frequency transforms are investigated, and examples of applications to radar imaging of single and multiple targets with complex motion are given

Keywords

Doppler radar; fast Fourier transforms; image reconstruction; motion compensation; radar computing; radar imaging; radar tracking; synthetic aperture radar; time-frequency analysis; tracking filters; Doppler frequency shifts; Doppler tracking; Wigner-Ville distribution; bilinear transforms; complex motion; high-resolution time-frequency transforms; image blurring problem; image reconstruction; joint time-frequency transform; matched filter; motion compensation; multiple targets; radar processor; radar range-Doppler imaging; range compression; short time FT; single targets; synthetic array radar; Doppler radar; Electromagnetic scattering; Fourier transforms; Motion compensation; Radar antennas; Radar imaging; Radar scattering; Radar tracking; Signal resolution; Time frequency analysis;

fLanguage

English

Journal_Title

Aerospace and Electronic Systems, IEEE Transactions on

Publisher

ieee

ISSN

0018-9251

Type

jour

DOI

10.1109/7.670330

Filename

670330