Ground brightness temperature measurement by crossed antenna with a negative sidelobe compensation

Author

Shannikov, D.V.

Author_Institution

Dept. of Radiophys., St. Petersburg State Tech. Univ., Russia

Volume

3

fYear

34881

fDate

10-14 Jul1995

Firstpage

1808

Abstract

The effect of negative sidelobe compensation is studied, based on experimental and theoretical analysis. The crossed antenna with the two arms perpendicular to each other (Mills cross) is considered. The signal of the unbroken arm is connected with the signal of the broken arm in the microwave device. The efficiency of the system for this compensation method is 90% when the break width is 7% of the arm length. In the experiment a radiometer receiver with the sensitivity 0.5 K/s was designed. The measured brightness temperature variation was 250 K. For checking the same measurements were performed by an aperture antenna with the same angle resolution. The difference between the two results obtained is about 5 K

Keywords

antenna radiation patterns; brightness; geophysical equipment; geophysical techniques; microwave measurement; microwave receivers; radiometry; receiving antennas; remote sensing; temperature measurement; 500 MHz; Mills cross; THF; broken arm; crossed antenna; ground brightness temperature measurement; microwave device; negative sidelobe compensation; radiometer receiver; unbroken arm; Antenna measurements; Antenna radiation patterns; Aperture antennas; Arm; Brightness temperature; Directive antennas; Milling machines; Receiving antennas; Remote sensing; Temperature measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Geoscience and Remote Sensing Symposium, 1995. IGARSS '95. 'Quantitative Remote Sensing for Science and Applications', International

Conference_Location

Firenze

Print_ISBN

0-7803-2567-2

Type

conf

DOI

10.1109/IGARSS.1995.524033

Filename

524033