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A MIMO architecture for SaR application
This paper propose a MIMO architecture proposed for a S-band VTS coastal radar aiming to detect, up to 10 km range, small RCS targets (<1m2) in sea state 0-5, due to rubber boats of illicit trafficking of humans and materials in SaR (Search and Rescue Maritime) Surveillance systems (RANGER system). The radar architecture is formed of a filled RX ULA (Uniform Linear Array) with Mr elements, and of a co-located TX ULA with Mt elements separated by l=Mr*l/ 2. This basic configuration is equivalent to a uniform filled ULA with MrMt elements and MIMO orthogonality of TX-s waveforms is obtained by Time Domain Multiplexing of the transmitted large band FM chirp between different TX-s. The potential leakage between Doppler domain and azimuth domains put some constrains on MIMO processing. In particular it is shown how a pseudo-random law of TX array scanning may mitigate this leakage. It is then shown that a small boat may be well detected thank to fine range resolution (large bandwidth), narrow beam (large TX array aperture) and fine Doppler processing. Finally it is shown that a bi-static architecture may further improve detection performance due to both clutter cell and bi-static clutter Reflectivity reduction.
Prodi Francesco, Pierno Luigi, Farina Alfonso
Paper for Seminar/Symposium/Conference
MSAW 2019 - NATO Maritime Situational Awareness Workshop (08-10 Ottobre 2019, c/o Villa Marigola, Lerici, Italy)
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