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This paper deals with the problem of modeling and detecting extended targets using distributed coherent multi-band multiple-input multiple-output radars enabled by photonics. First, a well-established methodology is applied for modeling the radar cross-section (RCS) of a sample maritime target. Then, the target RCS behavior is studied varying the aspect angle and operating frequency. Finally, different detection strategies, based on the constant false alarm rate criterion, are investigated and compared. Simulations are performed to evaluate the performance of the proposed strategies in close-to-reality maritime surveillance scenarios. The decisive impact of distributed sensors and multiple carrier frequencies is demonstrated compared to a single-band stand-alone radar system.