Beidou satellite navigation and positioning system is a global satellite navigation system developed and operated independently by our country, and it is one of the four major satellite navigation systems in the world. Beidou satellite navigation system has four functions of navigation, positioning, timing and communication. Beidou navigation system is widely used in national defense security, transportation, marine fishery, safe production, disaster mitigation and relief, Areas such as surveying and mapping, telecommunications and mass consumption. Radar is a traditional navigation device, used to set, avoid touching, navigation.

The Automatic Identification System (Automatie Identifieation Systems AIS) is a system that uses modern communication and information technology to identify surrounding ships and track their motion status. The technology first appeared in the 1990s, initiated by developed countries, with information technology as the guide, with multi-category high-tech as the pillar, in the subsequent development, due to the active participation of several international organizations, in particular the International Maritime Organization (IMO), the International Association of Navigation (IALA), the International Telecommunication Union (ITU-R) The joint efforts and cooperation have greatly promoted the development of this new technology, which not only guarantees the safety of navigation but also improves the efficiency of shipping, and has formulated a series of international regulations and technical standards through investigation and research and development experiments. At present, the technology of the system has matured, and on July 1, 2008 has been fully implemented.

At present, the Shipborne global satellite navigation receiver andAIS ReceiversWork independently, and location and time areAIS ReceiversRequired information. At present, the ship AIS receiver has obtained the position and time information from GPS, GPS is the real-time, all-weather, and global navigation positioning provided by the United States for the three fields of land, sea and air, in addition to navigation and location services, it is also used for some military purposes such as intelligence gathering, nuclear explosion monitoring, and emergency communications, AIS receivers can not use GPS signals, thus affecting the safe and reliable navigation of ships, at the same time, separateAIS ReceiversAnd GPS and other navigation equipment has a high cost, taking up more marine space.