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| The Research and Application of Modified Wavenumber Domain Algorithm to Real-time Processing |
| Wang Yu①②; Wang Bin①②; Zhang Zhi-min①; Deng Yun-kai① |
| ①Institute of Electronics, Chinese Academy of Sciences, Beijing 100080, China; ②Graduate University of the Chinese Academy of Sciences, Beijing 100039, China |
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Abstract Wavenumber Domain Algorithm (WDA), as a superior SAR signal processing algorithm, is widely applied to the case of wide aperture and high squint angle. However, Interpolation in the 2-dimensional frequency domain is necessary and the motion compensation can not be integrated, so it can not be implemented easily in the real-time processing. In this paper, two modified version of WDA are exploited: one is fit for low-accurate processing, in which the residual Range Cell Migration (RCM) is ignored to improve the processing efficiency; Another is fit the high-accurate processing, in which the FRactional Fourier Transform (FRFT) is employed to correct residual RCM. The two algorithms are free of interpolation and able to be implemented in the real-time processing. In addition, the phase errors of the two algorithms are analyzed particularly. Finally, the results of simulating the point targets and processing the real X-band data are given. The results show that the two algorithms can satisfy the requirements of the real engineering.
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Received: 24 November 2006
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2008, Vol. 30 
