TY - GEN
T1 - Two-step motion compensation method for step-frequency UAV SAR imagery
AU - Fan, Bangkui
AU - Long, Teng
AU - Ding, Zegang
PY - 2013
Y1 - 2013
N2 - In unmanned aerial vehicle (UAV) synthetic aperture radar (SAR), step-frequency mode is usually used due to the limitation of size and weight. Due to the small size and weight, the trajectory deviation is so serious that the motion compensation becomes very complex. In order to estimate and compensate the motion error in UAV SAR, a two-step motion compensation approach is proposed in this paper. Firstly, the global positioning system (GPS) and inertial navigation system (INS) data is used for the coarse compensation to eliminate the major motion error. Secondly, fine phase error compensation based on raw SAR data is processed to circumvent the residual phase error. The fine phase error is estimated by weighted phase gradient autofocus (WPGA) in each sub-pulse of step-frequency mode. Then the weight least square (WLS) method is used to obtain the final focusing phase from the estimated phase of sub-pulse. Real data experiments show that the proposed method is suitable for UAV SAR motion compensation.
AB - In unmanned aerial vehicle (UAV) synthetic aperture radar (SAR), step-frequency mode is usually used due to the limitation of size and weight. Due to the small size and weight, the trajectory deviation is so serious that the motion compensation becomes very complex. In order to estimate and compensate the motion error in UAV SAR, a two-step motion compensation approach is proposed in this paper. Firstly, the global positioning system (GPS) and inertial navigation system (INS) data is used for the coarse compensation to eliminate the major motion error. Secondly, fine phase error compensation based on raw SAR data is processed to circumvent the residual phase error. The fine phase error is estimated by weighted phase gradient autofocus (WPGA) in each sub-pulse of step-frequency mode. Then the weight least square (WLS) method is used to obtain the final focusing phase from the estimated phase of sub-pulse. Real data experiments show that the proposed method is suitable for UAV SAR motion compensation.
KW - Motion compensation
KW - Step-frequency
KW - Synthetic aperture radar (SAR)
KW - Unmanned aerial vehicle (UAV)
KW - Weight phase gradient autofocus (WPGA)
UR - https://www.scopus.com/pages/publications/84894566565
U2 - 10.1049/cp.2013.0425
DO - 10.1049/cp.2013.0425
M3 - Conference contribution
AN - SCOPUS:84894566565
SN - 9781849196031
T3 - IET Conference Publications
BT - IET International Radar Conference 2013
T2 - IET International Radar Conference 2013
Y2 - 14 April 2013 through 16 April 2013
ER -