Maritime Satellite Communication

A marine radio communication system using a communication satellite as a trunk station. It features high quality, large capacity, global, around-the-clock, full-time communication. In 1976, the United States successively launched three maritime communication satellites over the Atlantic, the Pacific, and the Indian Ocean, and established the world's first maritime satellite communication station with the main capacity serving the navy. In July 1979, the International Maritime Satellite Organization was established. In 1982, the International Maritime Satellite Communication System was established to become the first generation of the International Maritime Satellite Communication System. Although maritime satellite communication systems are expensive, they have broad development prospects due to their advantages.

The maritime satellite communication system is composed of three parts: the communication satellite, the shore station, and the ship station. ① Maritime communication satellite. It is a system's trunk station used to receive, send, and ship station signals. Satellites are deployed in the Pacific Ocean, the Atlantic Ocean, and the Indian Ocean. They use static orbital satellites that provide telephone, telegraph, fax, and shared call services. ② Bank station. It is a maritime satellite communication earth station located on the coast. It acts as a communication network, and has antennas and other equipment. The shore station can be connected to other communication networks on the land. ③ Ship station. It is a maritime satellite communication earth station installed on the ship. It is a system communication terminal equipped with a parabolic antenna and other equipment. Telephone communication uses the frequency modulation method, and telegraph communication uses the phase shift keying modulation method. The capacity of each communication satellite is allocated by the Network Coordination Station of the designated bank station. The telegraph channel is pre-allocated to each shore station, which is responsible for allocating time slots for telegraph communication with the ship station. The telephone channel is controlled by the Network Coordination station and allocated after the application is made by the Ship Station and the shore station.