Abstract
A high resolution inverse synthetic aperture radar (ISAR) technique is presented using modified Doppler history based motion compensation. To this purpose, a novel wideband ISAR system is developed that accommodates parametric processing over extended aperture length. The proposed method is derived from an ISAR-to-SAR approach that makes use of high resolution spotlight SAR and sub-aperture recombination. It is dedicated to wide aperture ISAR imaging and exhibits robust performance against unstable targets having non-linear motions. We demonstrate that the Doppler histories of the full aperture ISAR echoes from disturbed targets are efficiently retrieved with good fitting models. Experiments have been conducted on real aircraft targets and the feasibility of the full aperture ISAR processing is verified through the acquisition of high resolution ISAR imagery.
Highlights
In modern military and surveillance application, there are increased concerns on the threats from unmanned aerial vehicle (UAV) or small drones intruding into secured areas [1,2]
We show that the Doppler history of the wide aperture inverse synthetic aperture radar (ISAR) signal, after corruption by the severe platform motion, can be fully traced and retrieved with the best fitting model
The difficulty of Doppler history estimation is other hand, a small target flying at relatively low speed is disturbed and becomes vulnerable to escalated in proportion to the aperture lengths
Summary
In modern military and surveillance application, there are increased concerns on the threats from unmanned aerial vehicle (UAV) or small drones intruding into secured areas [1,2]. When wide aperture span is employed for high resolution ISAR, blurring effects tend to deteriorate as the rotational motion error is highly sensitive to the target aspect angle. In this case, traditional methods are hardly effective and the quality of the processed images gets impaired. Both SAR and ISAR make use of the principle that the synthetic aperture is a result of coherent processing of multiple echoes from diverse aspect angles In this respect, high resolution SAR mode is converted into ISAR scheme through model parameter conversion. Doppler and velocity parameters are independently estimated for the fully extended aperture interval with high precision such that the non-uniformly disturbed target motions are fully compensated and focused at ISAR processor.
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