- Fig. 1 – GUI interface of the developed simulation software employed for the EMI analysis. The software is able to estimate numerically the in-band and out-band coupling between sensors placed onto a general structure. In the example, an integrated naval mast is shown.
- Fig. 2 – Manufactured prototype of a simplified scaled two-face mast in an cleaned environment used as a benchmark for the performance assessment. As the embedded sensors, two ridged horn antennas were used at once, respectively one on transmit and the other on receive.
In the new-generation naval platforms the topside sensing and communication systems are not hosted on the mast but are embedded in the profile of the naval vessel itself. This changes drastically the appearance of the naval vessel and in some cases antennas and sensors are totally hidden from the human sight. A so-called integrated mast can accommodate dozens of sensors and communication antennas which operate simultaneously at different frequencies and power levels. The presence of all these systems, however sophisticated and advanced they individually may be, on one ship creates several problems. All antennas, so close together will affect each other. On most naval vessels it is necessary to switch one system off before an other antenna can be used. This has been the cause of some serious incidents. As a matter of fact the mutual coupling between the sensors plays a crucial role in reducing drastically the overall system performance to an unacceptable level very often. The activity involved in the MITOS project was aimed to investigate and estimate the mutual coupling issues between the sensors generally placed onboard a naval military vessel. Particularly, a theoretical approach to describe and evaluate the mutual coupling phenomena has been developed and implemented in a software suite. The software tool is capable of importing any electromagnetic model of the source (either simulated with another EM modelling SW or measured) as well as any arbitrary geometry of the scenario. To assess the algorithm performance, as a testbed, a simplified scaled two-face mast has been built up and measured in a semi-anechoic chamber. Two ridged horn antennas were used at once, respectively as the transmitting source and the receiving victim.