TY - GEN
T1 - Azimuth-variant compensation in subaperture processing of curved trajectory SAR
AU - Li, Y.
AU - Ding, Z.
AU - Long, T.
PY - 2012
Y1 - 2012
N2 - Curved trajectory SAR has the variant velocity and attitude. The acceleration and vertical velocity increase the azimuth variation of Doppler rate when the supaperture processing is taken. The assumption of identical Doppler rate for targets of the same slant range no longer holds. As a result of that, the conventional SPECAN algorithm will defocus the targets far away from the centre of illumination region. In order to solve the problem, this paper proposes an azimuth-variant compensation method used in the subaperture processing of curved trajectory SAR. The method uses Fourier transform of short block in azimuth to divide the illumination region into several parts and to apply respective compensation. Two practical considerations of the compensation, the block size and the over-lapping rate of blocks, are analysed in detail. Simulation results verify the effectiveness of the compensation method.
AB - Curved trajectory SAR has the variant velocity and attitude. The acceleration and vertical velocity increase the azimuth variation of Doppler rate when the supaperture processing is taken. The assumption of identical Doppler rate for targets of the same slant range no longer holds. As a result of that, the conventional SPECAN algorithm will defocus the targets far away from the centre of illumination region. In order to solve the problem, this paper proposes an azimuth-variant compensation method used in the subaperture processing of curved trajectory SAR. The method uses Fourier transform of short block in azimuth to divide the illumination region into several parts and to apply respective compensation. Two practical considerations of the compensation, the block size and the over-lapping rate of blocks, are analysed in detail. Simulation results verify the effectiveness of the compensation method.
KW - Aperture dependence
KW - Azimuth-variant compensation
KW - Curved trajectory SAR
KW - Subaperture processing
UR - http://www.scopus.com/inward/record.url?scp=84877738382&partnerID=8YFLogxK
U2 - 10.1049/cp.2012.1720
DO - 10.1049/cp.2012.1720
M3 - Conference contribution
AN - SCOPUS:84877738382
SN - 9781849196765
T3 - IET Conference Publications
BT - IET International Conference on Radar Systems, Radar 2012
T2 - IET International Conference on Radar Systems, Radar 2012
Y2 - 22 October 2012 through 25 October 2012
ER -