DocumentCode
142916
Title
Improving Doppler frequency estimation from Envisat data
Author
Krcemer, Thomas ; Brekke, Camilla ; Johnsen, Harald
Author_Institution
Dept. of Phys. & Technol., UiT - The Arctic Univ. of Norway, Tromso, Norway
fYear
2014
fDate
13-18 July 2014
Firstpage
1124
Lastpage
1127
Abstract
This paper shows that Envisat ASAR data are degraded by a small periodic variation in gain between internal calibration cycles of the antenna, which introduces a significant bias when we try to estimate line-of-sight surface velocities from the estimated Doppler frequency shifts. We investigate the impact of the gain problems on the derived surface velocity product and propose a simple correction of the raw data.
Keywords
Doppler radar; Doppler shift; calibration; geophysical techniques; radar antennas; remote sensing by radar; synthetic aperture radar; Doppler frequency estimation; Doppler frequency shift; Envisat ASAR data; gain small periodic variation; internal calibration cycle; line-of-sight surface velocity estimation; radar antenna; raw data correction; surface velocity product; Azimuth; Doppler effect; Estimation; Frequency estimation; Logic gates; Sea surface; Synthetic aperture radar; Doppler frequency estimation; Synthetic aperture radar;
fLanguage
English
Publisher
ieee
Conference_Titel
Geoscience and Remote Sensing Symposium (IGARSS), 2014 IEEE International
Conference_Location
Quebec City, QC
Type
conf
DOI
10.1109/IGARSS.2014.6946627
Filename
6946627
Link To Document