Paper Info
Title
Technique for Concurrent Internal Calibration during Data Acquisition for SAR Systems.
Abstract
Nowadays, stringent requirements for the quality of SAR data products exist. The radiometric and image quality requirements can only be fulfilled by knowing the disturbances caused by the radar hardware itself. The internal calibration is a mechanism to estimate these disturbances from the real hardware. Unfortunately, most of the current internal calibration schemes interrupt the SAR data acquisition during internal calibration and hence cause a loss of azimuth samples and a degradation of the image quality. The calibration is thus often performed only before and after a data take. However, these two calibration events are hardly sufficient to estimate the instrument parameters during the whole acquisition especially for long data takes, which will become more common in future SAR system. In this paper, an internal calibration scheme is introduced which allows performing the internal calibration during nominal data acquisition by injecting a coded calibration signal into the receiver with very low power. This signal causes only minor degradation of the SAR image but can be retrieved from the data using adequate signal processing. This technique is described, the theoretical performance estimated, and finally demonstrated on real data from the TerraSAR-X mission. A selection of possible coding scheme is also analyzed with respect to their suitability for the proposed internal calibration scheme.
Year
DOI
Venue
2020
10.3390/rs12111773
REMOTE SENSING
Keywords
DocType
Volume
synthetic aperture radar,internal calibration,transmit receive module,spaceborne SAR,TerraSAR-X,SAR system calibration,radiometric correction,correlation processing,signal coding
Journal
12
Issue
Citations 
PageRank 
11
0
0.34
References 
Authors
0
2
Name
Order
Citations
PageRank
Jens Reimann100.68
Marco Schwerdt219629.75