Free space optics communication for transmission of warning and countermeasure information between ships

In the development of warner and countermeasure systems for ships in military units, there is a need of information transmission. This report studies laser communication, also called Free Space Optics (FSO), as an alternative to radio based communication. Communication range of more than 10 km is possible, even if the visibility is moderate. At poorer visibility the range will be reduced. The study show that high precision pointing and tracking is necessary, but in return covert communication with high bit rates (Gbps) is possible. The potential of high bit rates does not only make traditional warner and countermeasure information transmission possible. It can also be utilized for transmission of large quantities of sensor close data. This will result in new possibilities of distributed sensors and sensor fusion, for instance in getting bearing of other ships.