The SOLE concepts will be validated through the implementation of a demonstrator of a coherent constellation including the photonic core and three triband (C, X, Ku) sensors (an active sensor and two passive sensors) as sketched in Fig. 1, connected through optical fibers. The active sensor transmitter illuminates the scenario under test with the three sub-bands and its three-channel receiver (RX) that works in the same site, performs interferometric analysis over the three bands. The other two passive sensors will be placed in different sites for multistatic experiments, receiving the scattering signals from the targets present on the scene. Single element antennas will be used as a demonstration of the proof of concept, even if the optical links will be verified also in presence of WDM optical combs to feed phased array antennas. The demonstrator implementation will exploit an extension of an already available dual band radar prototype. The rest of the networked system will be based on discrete commercially available components.


The demonstrator will be validated through experiments of detection, tracking and imaging in a controlled and relevant maritime environment with cooperating and non-cooperating targets. These trials will be performed at the facilities and with the support of the Port Authority of Livorno, within an already existing agreement with CNIT.
At the Livorno Port, a network of already installed optical fiber will be exploited for connecting the sensor peripherals to the photonic core.

A quantitative evaluation of the improvements associated to multistatic imaging, as well as to interferometric applications due to the use of multiple frequency, is complex because of the highly non-linear behavior of the target response and of the processing chain going from the raw data to the final output. One of the main objectives of SOLE will therefore be the investigation of the improvements achievable with the different acquisition configurations.