Azimuthal ambiguities in synthetic aperture sonar and synthetic aperture radar imagery

Author

Rolt, Kenneth D. ; Schmidt, Henrik

Author_Institution

Dept. of Ocean Eng., MIT, Cambridge, MA, USA

Volume

17

Issue

1

fYear

1992

fDate

1/1/1992 12:00:00 AM

Firstpage

73

Lastpage

79

Abstract

It is shown that azimuthal ambiguities are not eliminated by the nulls of a sonar (or radar) beam pattern and have a definite influence on image quality. In synthetic aperture systems that are strongly limited in spatial sampling, particularly in ocean borne synthetic aperture sonar (SAS) and spaceborne synthetic aperture radar (SAR), azimuthal ambiguities will corrupt the images unless special measures are taken. These azimuthal aliases may be reduced by emphasizing the centermost portion of the available synthetic aperture length, and deemphasizing the endmost portions. This minimizes the effects from synthetic array elements that most strongly contribute to aliases

Keywords

radar theory; signal processing; sonar; azimuthal aliases; azimuthal ambiguities; image quality; signal processing; spaceborne SAR; spatial sampling; synthetic aperture length; synthetic aperture radar imagery; synthetic aperture sonar; Image quality; Image sampling; Oceans; Particle measurements; Radar imaging; Sea measurements; Sonar measurements; Spaceborne radar; Synthetic aperture radar; Synthetic aperture sonar;

fLanguage

English

Journal_Title

Oceanic Engineering, IEEE Journal of

Publisher

ieee

ISSN

0364-9059

Type

jour

DOI

10.1109/48.126956

Filename

126956