Title :
Azimuth dependence of quadratic range cell migration correction for the high squint synthetic aperture radar
Author :
Shuangxi, Zhang ; Rui, Guo ; Gang, Xu ; Mengdao, Xing
Author_Institution :
Nat. Key Lab. for Radar Signal Process., Xidian Univ., Xi´´an, China
Abstract :
For the high squint strip-map mode synthetic aperture radar (SAR), the range cell walk correction (RCWC) in azimuth time domain will bring space-variant along azimuth of quadratic range cell migration. To get the full resolution and quality of the image, the space-variant for the quadratic phase and the quadratic range cell migration in the azimuth must be taken account. In this paper, a novel processing algorithm for the space-variant of quadratic range cell migration is proposed. In the algorithm, the azimuth dependence component of quadratic range cell migration is implemented by the azimuth space-variant filtering in the range frequency domain. After that, the unified quadratic range cell migration can be corrected in the 2-D frequency domain. Simulation and airborne strip-map real data show the accurate and efficient of the proposed algorithm.
Keywords :
airborne radar; synthetic aperture radar; 2-D frequency domain; SAR; airborne strip-map real data; azimuth dependence; azimuth time domain; high squint synthetic aperture radar; quadratic range cell migration; quadratic range cell migration correction; range cell walk correction; strip-map mode synthetic aperture radar; Atmospheric modeling; Azimuth; Chirp; Equations; Frequency domain analysis; Synthetic aperture radar; high squint; nonlinear chirp scaling (NCS); range cell migration correction (RCMC); space-variant filtering; synthetic aperture radar (SAR);
Conference_Titel :
Radar (Radar), 2011 IEEE CIE International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4244-8444-7
DOI :
10.1109/CIE-Radar.2011.6159846