Abstract
In this study, we propose a high-resolution synthetic aperture radar (SAR) imaging method for curved-orbit geometry in bistatic configurations with spatially separated transmitter and receiver. To accommodate large curved-path and bistatic configuration properties, we first formulate a B-SAR signal using a polynomial range model and derive its two-dimensional (2D) phase spectrum. Next, we extend the basic concept of the typical omega-K algorithm (OKA) for B-SAR by focusing on the polynomial range model, referred to as polynomial-OKA (P-OKA), enabling us to provide focused SAR images in curved-path and bistatic configurations. Using point target simulations, we verified the efficacy of the proposed P-OKA, where fully focused high-resolution B-SAR images were obtained in various curved-path scenarios.
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