Two-Beam Coupling Correlation Synthetic Aperture Radar Image Recognition with Power-law Scattering Centers Pre-Enhancement
AIR FORCE RESEARCH LAB HANSCOM AFB MA OPTOELECTRONIC TECHNOLOGY BRANCH
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Synthetic radar image recognition is an area of interest for military applications including automatic target recognition, air traffic control, and remote sensing. Here a dynamic range compression two-beam coupling joint transform correlator for detecting synthetic aperture radar SAR targets is utilized. The joint input image consists of a pre-power-law, enhanced scattering center of the input image and a linearly synthesized power-law enhanced scattering center template. Enhancing the scattering center of both the synthetic template and the input image furnishes the conditions for achieving dynamic range compression correlation in two-beam coupling. Dynamic range compression a enhances the signal to noise ratio, b enhances the high frequencies relative to low frequencies, and c converts the noise to high frequency components. This improves the correlation peak intensity to the mean of the surrounding noise significantly. Dynamic range compression correlation has already been demonstrated to outperform many optimal correlation filters in detecting signals in severe noise environments. The performance is evaluated via established metrics, such as peak-to-correlation energy PCE, Horner efficiency and correlation peak intensity. The results showed significant improvement as the power increased.
- Active and Passive Radar Detection and Equipment