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| Study on High Resolution Overlapped Subaperture Imaging Algorithm
for High Squint Airborne SAR Processing |
| Li Yong; Zhu Dai-yin; Zhu Zhao-da |
| College of Information Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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Abstract A high-resolution subaperture imaging algorithm incorporated with the correction of 2-D image geometric distortion and the compensation of spatially-variant phase error for high squint airborne synthetic aperture radar is presented. Each subaperture processing is based on linear range-Doppler algorithm. According to the basic theory of rotating-object imaging, a methodology is developed to realize the range and Doppler alignment of the corresponding scatterers in successive subimages by the geographical coordinate transforming and positioning, while the step transform technique based on SPECAN is employed to obtain the high-resolution image. The point-target simulations and live data processing results show the validity of the proposed approach.
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Received: 27 December 2004
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2006, Vol. 28 
