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A modified phase gradient autofocus (PGA) method tailored for circular trace scanning synthetic aperture radar (CTSSAR) is provided in this paper to handle the motion compensation problem. In CTSSAR, the circular orbit makes the imaging and the motion compensation hard to perform, and the traditional algorithms cannot accomplish precise imaging. Different from the classical PGA method, the modified...
Low frequency ultra wideband (UWB) synthetic aperture radar (SAR) has shown a great potential when vehicle-size objects are obscured in foliage. The studies imply an aperture angle of at least 180° to include the strongest (broadside) response when the target orientations are unknown. However, the aperture angle of the linear SAR (LSAR) is limited. By using circular traces, the aperture angle of the...
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