AIS SIGNAL RECEIVING SYSTEM AND AIS SIGNAL RECEIVING METHOD

摘要

PROBLEM TO BE SOLVED: To flexibly cope with an orbital position and observation sea area special to an artificial satellite, a peripheral land terrain, and various changes in relative ship distribution involved in those without using a large-scale antenna system.SOLUTION: An AIS signal receiving system independently receives an AIS signal transmitted by a ship 3 via each of a plurality of AIS antennas 22-22mounted on an artificial satellite 2, forms desired antenna beams S-Son digital with a DBF, and observers each of the received AIS signals according to the formed antenna beams S-S.SELECTED DRAWING: Figure 3