In 2016 we started with our real-time SONAR signal processing approaches. In a first work package we implemented the basic algorithms in our framework KiRAT. The underwater channel was simulated using linear and time-invariant (LTI) filters or we used prerecored signals. While the first approach (LTI simulation) is not very realistic, the second one does not allow to have our systems really in the "loop". Thus, the idea was born that our real-time approaches must be tested in real environments.
"Real environments" means here to test our systems in the Baltic sea. If we would try to get some measurement slots on research vessels (something what we will definetly do, but in addition to the following), the time between algrorithmic development and realistic testing would be much too long. Thus, we decided to built two small research ships that can be easily moved to different test places (ships on trailers). The first one should be really light weighted, such that a few of us can carry it without the need of any crane. The platform for this ship was a pedal boat from the US that we modified such that our MIMO-SONAR system can be used. This was also the origin for the ships name that Alexej Namenes created: MISSy, which stands for "MIMO SONAR system".
MISSy can carry either two people plus some light equimpement such as the underwater phone system or pseudo targets or one operator plus some more equipment. However, for our larger MIMO systems and especially if we would like to test distributed systems a second ship is necessary. Here, we decided to use a small ponton ship, with a small crane on it, that can be used for our cognitive adaptive SONAR systems, which is also the origin of the name "CASSy".
Both "sisters" together, MISSy and CASSy, will allow us to have really fast loops between system design with corresponding extensions and first water tests.