High Precision Radar Distance Measurements in Overmoded Circular Waveguides

Author

Pohl, Nils ; Gerding, Michael ; Will, Bianca ; Musch, Thomas ; Hausner, Josef ; Schiek, Burkhard

Author_Institution

Ruhr-Univ. Bochum, Bochum

Volume

55

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

1374

Lastpage

1381

Abstract

Distance measurements in overmoded waveguides are an important application for industrial radar systems. The accuracy of the measurements is deteriorated by the appearance of higher order modes in the metal tube, although the frequency-modulated continuous-wave method is used with a large bandwidth. This paper describes the problems caused by dispersion and multimode propagation and presents a solution in the form of mode-matched antennas for feeding the overmoded waveguide. It is shown that different modes, e.g., the H₁₁ and H₀₁ modes, are equally well suited for precision distance measurements, as is demonstrated both by simulations and measurements.

Keywords

CW radar; FM radar; circular waveguides; distance measurement; frequency modulated continuous wave; higher order mode suppression; industrial radar system; low-loss mode; mode-matched antenna; multimode propagation; overmoded circular waveguides; oversized waveguide; radar distance measurement; signal dispersion; waveguide transition; Antenna measurements; Bandwidth; Distance measurement; Frequency measurement; Performance evaluation; Radar applications; Radar measurements; Spaceborne radar; Transfer functions; Waveguide transitions; Frequency modulated continuous wave (FMCW); higher order mode suppression; low-loss mode; overmoded circular waveguide; oversized waveguide; radar distance measurement; waveguide transition;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2007.896784

Filename

4230892