Azimuthal scattering pattern of trees at X-band

Author

Narayanan, Ram M.

Author_Institution

Dept. of Electr. Eng., Nebraska Univ., Lincoln, NE

Volume

29

Issue

2

fYear

1993

fDate

4/1/1993 12:00:00 AM

Firstpage

588

Lastpage

593

Abstract

The azimuthal scattering characteristics of a variety of fully foliated trees were measured in the field using a short-range X-band bistatic radar system operating at 9 GHz. Azimuthal measurements were made for both VV and VH polarizations over a 180° angle between the transmitter and receiver antennas at 10° intervals. Data were collected at transmit and receive ranges of approximately 5 m, and the beam impinged horizontally on the trees. The azimuthal power pattern, normalized to the copolarized backscattered power, showed a peak in the forward scattering direction (azimuth angle of 180°) due to direct coherent transmission, whose magnitude was seen to depend on the foliage area density. The diffuse bistatically scattered power in the range of azimuth angles between 10° and 90° showed standard deviations on the order of 4 dB. In addition, needleleaf trees were found to depolarize the incident energy more than the broadleaf trees

Keywords

electromagnetic wave scattering; forestry; microwave measurement; remote sensing by radar; 5 m; 9 GHz; VH polarizations; VV polarisation; X-band; azimuthal power pattern; azimuthal scattering characteristics; bistatic radar; broadleaf trees; copolarized backscattered power; direct coherent transmission; foliage area density; foliated trees; forward scattering direction; needleleaf trees; receiver antennas; standard deviations; Antenna measurements; Azimuth; Bistatic radar; Low-noise amplifiers; Polarization; Radar cross section; Radar scattering; Receiving antennas; Transmitters; Transmitting antennas;

fLanguage

English

Journal_Title

Aerospace and Electronic Systems, IEEE Transactions on

Publisher

ieee

ISSN

0018-9251

Type

jour

DOI

10.1109/7.210099

Filename

210099