Polarimetric calibration for wideband synthetic aperture radarimaging
Ertin, E.
Potter, L.C.
Dept. of Electr. Eng., Ohio State Univ., Columbus, OH;
This paper appears in: Radar, Sonar and Navigation, IEE Proceedings -
Publication Date: Oct 1998
Volume: 145,
Issue: 5
On page(s): 275-280
ISSN: 1350-2395
References Cited: 19
CODEN: IRSNE2
INSPEC Accession Number: 6092123
Current Version Published: 2002-08-06
Abstract
Multi-channel techniques are introduced to calibrate for effects
of antenna shading and crosstalk in wideband, wide-angle full
polarisation radar imaging. The system is modelled as a two-dimensional
integral operator which includes the transmit pulse function, receive
and transmit antenna transfer functions, and response from scattering
objects. Existing imaging algorithms provide an approximate inversion of
this integral operator, without compensation for the effect of the
multi-channel antenna transfer functions. Thus, standard processing
yields poor image quality, due to the inherent variation of the antenna
response (in magnitude, phase, and polarisation) across the large band
of frequencies and wide range of aspect angles. Two techniques are
proposed for regularised inversion of the system model. Both techniques
require measurements of the antenna transfer function over the look
angles and frequency band of interest. The first technique adopts a
local approximation to process multi-channel range lines separately and
is suitable for imaging small regions. The second technique achieves
multi-channel deconvolution of the antenna response in the transform
(Doppler) domain and is suitable for large data records. The result is
imagery with improved polarisation purity and a more localised point
spread function
Index
Terms
Available to subscribers and IEEE members.
References
Available to subscribers and IEEE members.
Citing Documents
Available to subscribers and IEEE members.
Cart
