科研之友
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摘要
An imaging algorithm mainly processed in the frequency domain for the hybrid spaceborne/airborne BSAR is presented. The key point of deriving the algorithm is the analytical evaluation of the system transfer function's 2-D spectrum. To overcome the difficulty of resolving analytical solution for the stationary phase point, the spectrum's phase is approximated by two-order Taylor expanding around the point, which is in the neighborhood of the system's corresponding stationary phase point and can be obtained analytically. Thus the approximated analytical spectrum is pretty close to the actual one. In the imaging algorithm, both range-dependent range cell migration and azimuth-dependent range cell migration are compensated in two steps: Scaled inverse Fourier transform (SIFT), which can be realized through the chirp z-transform, and phase multiplication. The validity of the algorithm is demonstrated by simulation with both the point target and area target.
- 出版日期2008-7
- 单位电子科技大学
