Abstract
In this paper, a novel signal processing technique hasbeen developed to refocus moving targets image from their smeared responses in the Synthetic Aperture Radar (SAR) image according to the characteristics of the received signals for moving targets. Quadratic Phase Function is introduced to the parameters estimation for moving target echo and SAR imaging. Our method is available even under a low SNR environment and acquiring an exact SAR image of moving targets. The simulated results demonstrated the validity of the algorithm proposed.
Highlights
Airborne synthetic aperture radar (SAR) detection and imaging of moving targets on the ground has been a subject of long-standing interest in both civil and military applications such as battlefield reconnaissance, fire assessment, traffic management and monitoring ocean currents
Radar returns from terrain and stationary objects can be suppressed after using displaced phase center antenna (DPCA) or spacetime adaptive processing (STAP), only the returns from moving targets are used to reconstruct radar images
Several parameter estimation methods based on Maximum Likelihood (ML) [3] estimation cannot be implemented in engineering because of a huge amount of computation
Summary
Airborne synthetic aperture radar (SAR) detection and imaging of moving targets on the ground has been a subject of long-standing interest in both civil and military applications such as battlefield reconnaissance, fire assessment, traffic management and monitoring ocean currents. How to detect moving targets in the background of stationary objects called clutter is premise for SAR imaging of moving targets, this problem is usually solved by applying the displaced phase center antenna (DPCA) [1] or its modern extension, the spacetime adaptive processing (STAP) [2]. In this paper the Quadratic Phase Function (QPF) [7] [8] is introduced to the SAR moving target imaging, and a new SAR imaging algorithm based on the Quadratic Phase Function is presented. This method can achieve an idea result for moving targets imaging.
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