GPS positioning mobile phones and space technology

GPS positioning technology - is in the military and aerospace and wireless communications based on the development of science and technology set up a high-precision, all-weather and global radio navigation and positioning, timing of the multi-functional system, the space segment, ground control segment and user equipment three parts. It uses more than 20,000 km away from Earth at a high composition of 24 satellites by the satellite network (the so-called "Skynet"), to continue to launch the Earth location and time signals. Any one on Earth GPS receiver, as long as four or more received signals from the satellite, after calculation of treatment, can be reported to the GPS receiver (target) position (longitude, latitude, altitude), time and motion state (speed, course). GPS can achieve accuracy, speed, weather and global performance.

GSM wireless mobile communication technology of the global digital mobile system is currently the most extensive coverage and support data, voice and radio, most users of digital mobile cellular communications systems, and has strong security features. GSM network is the most advanced wireless communications network. GSM around in a uniform manner to provide all telecommunication services with domestic and international roaming. User Authentication protects network from right users. With conventional VHF / UHF radio communication network, 800M wireless communications network cluster comparison, it is not only communication range, the system is reliable, and economical and practical, easy to spread less investment, reduce duplication of dedicated investment in building communications network base stations, control centers around the easy networking. The current GSM network of China Telecom is the largest network, it has basically covered the whole country, and relying on powerful digital mobile cellular GSM network as communication technology, satellite positioning wireless communications network monitoring system will ensure th