TY - JOUR
T1 - An Improved Omega-K Algorithm for Squinted SAR With Curved Trajectory
AU - Li, Yongkang
AU - Zhang, Yonghui
AU - Liang, Junli
AU - Wang, Yingcong
N1 - Publisher Copyright:
© 2004-2012 IEEE.
PY - 2024
Y1 - 2024
N2 - The omega-K algorithm (ω KA) is an accurate imaging method for squinted synthetic aperture radar (SAR) with linear trajectory. However, for SARs with curved trajectory, since it does not allow the radar velocity to vary with range, the imaging quality would degrade severely. To address this issue, an improved ω KA is proposed in this letter. We design a special Stolt mapping to avoid the complex additional range cell migration (RCM) and the skew of the data support region. Then, the RCM correction (RCMC) and azimuth compression are operated in the range Doppler domain. With these improvements, the radar velocity is allowed to vary with range, which greatly reduces the phase error in the case of large range swaths. Numerical results validate the proposed algorithm.
AB - The omega-K algorithm (ω KA) is an accurate imaging method for squinted synthetic aperture radar (SAR) with linear trajectory. However, for SARs with curved trajectory, since it does not allow the radar velocity to vary with range, the imaging quality would degrade severely. To address this issue, an improved ω KA is proposed in this letter. We design a special Stolt mapping to avoid the complex additional range cell migration (RCM) and the skew of the data support region. Then, the RCM correction (RCMC) and azimuth compression are operated in the range Doppler domain. With these improvements, the radar velocity is allowed to vary with range, which greatly reduces the phase error in the case of large range swaths. Numerical results validate the proposed algorithm.
KW - Curved trajectory
KW - omega-K algorithm (ωKA)
KW - Stolt mapping
KW - synthetic aperture radar (SAR)
UR - https://www.scopus.com/pages/publications/85178006495
U2 - 10.1109/LGRS.2023.3335650
DO - 10.1109/LGRS.2023.3335650
M3 - 文章
AN - SCOPUS:85178006495
SN - 1545-598X
VL - 21
SP - 1
EP - 5
JO - IEEE Geoscience and Remote Sensing Letters
JF - IEEE Geoscience and Remote Sensing Letters
M1 - 4000905
ER -