| The Bistatic Forward-looking Synthetic Aperture Radar (BFSAR) is a specialworking mode of traditional bistatic SAR. With the choice of proper geometry, it is ableto realize high resolution imaging in the right ahead flight direction. Also, it caneliminate the inherent imaging dead zone of side-looking SAR, thus compensate for thedefect of normal side-looking mode. Many potential applications as it has, BSFAR isconsiderably worth of further research work.China has just begun the study of BFSAR. Based on the traditional theory ofBistatic SAR, this paper focuses on the imaging algorithm and the motion compensationtechnique of BFSAR. My major work is as follows.1. The principle of BFSAR is explained in many aspects based on the commonBistatic SAR, including the geometry mode, echo mode and resolution research.2. The imaging model of BFSAR is described. Both of RD algorithm and BPalgorithm are analyzed and compared. Additionally, their advantages and disadvantagesare pointed out and the character comparision between RD algorithm and BP algorithmis studied.3. The dissertation gives particularly empathies on motion error analysis. Theairborne BFSAR motion compensation technique based on the GPS/INS is presented.The method of how we make use of the parameters provided by GPS to compensate themotion error is proposed. The analysis of motion error groud on the prominentscattering point is introduced.. And then the phase tracking algorithm is shown. Thisalgorithm designs a series of narrow-band filters to restrain the clutter echo next to thestrong scattering point and obtains the estimation of the phase of the strong scatteringpoint. After the phase-unwrapped and the second curve fitting of the phase, the phaseerror is calculated. It can be used to compensate the motion error to improve theBFSAR image. Finally, the BFSAR RD algorithm integrating with the phase-tracking isshown and validated by the simulation, obatining the good BFSAR image. |
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