Title :
Calibration of the CARABAS VHF SAR system
Author :
Ulander, Lars M H ; Hellsten, Hans
Author_Institution :
Chalmers Univ. of Technol., Goteborg, Sweden
Abstract :
A radiometric calibration procedure applicable to wide-band VHF SAR systems is described. It is based on using near-resonant dipoles located at different heights above the ground surface. The radar cross section of the dipole and surface reflection interference (multi-path) is used to compute the frequency-averaged radar cross section. Analysis of calibration experiments in 1992 and 1993 is used to verify the described models and the calibration procedure. It is shown that reflections from sub-surfaces may be detected and used to estimate layer depth. The responses from 16 foot trihedral reflectors are also analyzed for comparison
Keywords :
airborne radar; calibration; geophysical techniques; radar applications; remote sensing by radar; synthetic aperture radar; 36 to 48 MHz; CARABAS VHF SAR; airborne radar; calibration; dipole; geophysical measurement technique; landsurface; near-resonant dipoles; radar cross section; radar remote sensing; radiometric calibration procedure; surface reflection interference; synthetic aperture radar; terrain mapping; trihedral reflector; wide-band; Broadband antennas; Calibration; Dipole antennas; Frequency; Interference; Polarization; Radar cross section; Radiometry; Reflection; Surface waves;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 1994. IGARSS '94. Surface and Atmospheric Remote Sensing: Technologies, Data Analysis and Interpretation., International
Conference_Location :
Pasadena, CA
Print_ISBN :
0-7803-1497-2
DOI :
10.1109/IGARSS.1994.399110
