TY - JOUR
T1 - An improved nonlinear chirp scaling algorithm based on curved trajectory in geosynchronous SAR
AU - Hu, Cheng
AU - Long, Teng
AU - Tian, Ye
PY - 2013
Y1 - 2013
N2 - Geosynchronous synthetic aperture radar (GEO SAR) has the characteristics of long aperture time and large imaging area. Therefore, the conventional imaging algorithm in Low Earth Orbit (LEO) SAR loses effect. In this paper, based on curved trajectory model under an ideal acquisition and not considering some acquisition perturbations (atmosphere, orbital deviations), an accurate two-dimensional frequency spectrum is analytically obtained via series reversion principle and high order Taylor expansion. Then, an improved Nonlinear Chirp Scaling (NCS) algorithm is proposed in GEO SAR, which includes novel range migration correction factor, coupling phase compensation factor, NCS factor and azimuth compression function. Finally, the correctness of the proposed NCS algorithm is verified via imaging results of point array targets and area targets.
AB - Geosynchronous synthetic aperture radar (GEO SAR) has the characteristics of long aperture time and large imaging area. Therefore, the conventional imaging algorithm in Low Earth Orbit (LEO) SAR loses effect. In this paper, based on curved trajectory model under an ideal acquisition and not considering some acquisition perturbations (atmosphere, orbital deviations), an accurate two-dimensional frequency spectrum is analytically obtained via series reversion principle and high order Taylor expansion. Then, an improved Nonlinear Chirp Scaling (NCS) algorithm is proposed in GEO SAR, which includes novel range migration correction factor, coupling phase compensation factor, NCS factor and azimuth compression function. Finally, the correctness of the proposed NCS algorithm is verified via imaging results of point array targets and area targets.
UR - http://www.scopus.com/inward/record.url?scp=84871911955&partnerID=8YFLogxK
U2 - 10.2528/PIER12092603
DO - 10.2528/PIER12092603
M3 - Article
AN - SCOPUS:84871911955
SN - 1070-4698
VL - 135
SP - 481
EP - 513
JO - Progress in Electromagnetics Research
JF - Progress in Electromagnetics Research
ER -