Near-field effect of extended targets on absolute calibration of microwave sensors

Author

Wu, Ji ; Jiang, Jingshan

Author_Institution

Center for Space Sci. & Appl. Res., Acad. Sinica, Beijing, China

Volume

1

fYear

1996

fDate

27-31 May 1996

Firstpage

739

Abstract

The near-field effect of extended target, i.e. the illuminated ground area of an active microwave sensor, is discussed. It is shown by both analysis and numerical examples that all measurements are taken in the near-field and the value of normalized backscattering coefficients are varying periodically even for a uniformly distributed scattering characteristics target while the platform altitude is increasing. In order to compensate this variation, a practical platform relocation technique is proposed

Keywords

backscatter; calibration; geophysical techniques; radar cross-sections; remote sensing by radar; SHF; absolute calibration; backscatter; extended target; geophysical measurement technique; illuminated ground area; land surface; microwave sensor calibration; near field effect; normalized backscattering coefficients; platform relocation technique; radar remote sensing; radar scattering; terrain mapping; vegetation mapping; Area measurement; Backscatter; Calibration; Microwave sensors; Phase measurement; Rain; Receiving antennas; Scattering; Sensor phenomena and characterization; Uncertainty;

fLanguage

English

Publisher

ieee

Conference_Titel

Geoscience and Remote Sensing Symposium, 1996. IGARSS '96. 'Remote Sensing for a Sustainable Future.', International

Conference_Location

Lincoln, NE

Print_ISBN

0-7803-3068-4

Type

conf

DOI

10.1109/IGARSS.1996.516460

Filename

516460