Application of 3s Technology in Military Field

3S technology is the general name of remote sensing, geographic information system and global positioning system. They are named because all three concepts contain an S in their corresponding English. Remote sensing Remote sensing, as its name implies, is remote sensing. The legendary "clairvoyance" and "clairvoyance" have such ability. Through a lot of practice, human beings find that every object on the earth is constantly absorbing, emitting and reflecting information and energy, among which there is a form that human beings have recognized-electromagnetic wave, and it is found that the electromagnetic wave characteristics of different objects are different. Remote sensing is based on this principle to detect the reflection of electromagnetic waves and the electromagnetic waves emitted by surface objects, so as to extract the information of these objects and complete the long-distance identification of objects. Global Positioning System (GPS) is a new generation of space satellite navigation and positioning system approved by the US Department of Defense and jointly developed by the armed forces. Its main purpose is to provide real-time, all-weather and global navigation services for land, sea and air, and it is also used for some military purposes such as intelligence gathering, nuclear explosion monitoring and emergency communication. It is an important part of America's global dominant strategy. After more than 20 years of research and experiments, it cost 30 billion dollars. By1March 1994, 24 GPS satellite constellations with global coverage of 98% had been deployed. The Global Positioning System (GPS) consists of three parts: the ground control part, which consists of the main control station (responsible for managing and coordinating the work of the whole ground control system), the ground antenna (injecting navigation messages into the satellite under the control of the main control station), the monitoring station (automatic data acquisition center) and the communication auxiliary system (data transmission); Space part, consisting of 24 satellites, distributed on 6 orbital planes; The user equipment part is mainly composed of GPS receiver and satellite antenna. The main characteristics of GPS global positioning system are: all-weather, not affected by the weather; Global coverage; High-precision three-dimensional fixed-point fixed-speed timing; Fast, time-saving and efficient; It has a wide range of uses and diverse functions. The main uses of GPS global positioning system: land applications, mainly including vehicle navigation, scenic spot guidance, emergency response, high-precision time-frequency comparison, atmospheric physical observation, geophysical resource exploration, engineering survey, deformation monitoring, crustal movement monitoring, municipal planning control, etc. Marine applications, including the determination of the best navigation route of ocean-going ships, real-time ship dispatching and navigation, maritime rescue, marine treasure exploration, hydrogeological survey, offshore oil well platform positioning, sea level fluctuation monitoring, etc. Aerospace application, aircraft navigation, attitude control of aerial remote sensing, orbit determination of low-orbit satellites, missile guidance, aviation rescue and manned spacecraft protection detection, etc. There are many kinds of GPS satellite receivers, which are divided into geodesic type, all-station type, time service type, hand-held type and integrated type according to models. According to the purpose, it is divided into vehicle, ship, airborne, satellite and missile. After more than 20 years of practice, it has been proved that GPS system is a global system with high precision and all weather.