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The paper concentrates on bistatic polar format algorithm (PFA) for focusing the spotlight bistatic Synthetic aperture radar (SAR) data. Exploring the imaging geometry of spotlight mode, a wavenumber vector Kbis derived according to the original definition of wavenumber. The direction of the vector Kb corresponds to the path from the transmitter to the target in the scene to the receiver in the bistatic SAR configuration. Using the vector Kb, a point target position vector in the scene can be expressed as the same form as that of conventional monostatic spotlight SAR. Based on the vector Kb, the spotlight bistatic PFA is derived and is presented concisely. In the simulation experiments, the presented PFA and BP algorithm process the same area target respectively. The result of the experiments show the PFA mentioned in this paper is valid. The quality of the processing result achieved by the PFA is not worse than that by BP algorithm.

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