source:truck tracking webfleet solutions release time:2022-12-13 Hits: Popular:realtime gps tracker online
The predecessor of the GPS system is a "transit" navigation satellite system developed by the US military. It was developed in 1958 and officially put into use in 64. The system works with a satellite network composed of 5 to 6 satellites, bypassing the Earth 13 times at most every day, and cannot give altitude information, and its positioning accuracy is not satisfactory. However, the transit system enables the R&D department to gain preliminary experience in satellite positioning, and verifies the feasibility of positioning by satellite system, laying the groundwork for the development of GPS system. Because satellite positioning shows great advantages in navigation and the meridian system has great defects in submarine and ship navigation. The United States Navy, Land, Air Force and civilian sectors all feel an urgent need for a new satellite navigation system. To this end, the US Naval Research Laboratory (NRL) proposed a global positioning network plan called Tinmation, which uses 12 to 18 satellites to form a 10000 km height. In 67, 69 and 74, it launched a test satellite respectively. The atomic clock timing system was preliminarily tested on these satellites, which is the basis for the accurate positioning of the GPS system. The US Air Force has put forward the 621-B plan to form three to four star clusters with four to five satellites per star cluster. Except one of these satellites uses synchronous orbit, the rest of these satellites use inclined orbits with a period of 24h. The plan uses pseudo-random code (PRN) as the basis to spread satellite ranging signals. Its powerful function can also detect when the signal density is lower than 1% of the environmental noise. The successful application of pseudorandom code is an important basis for the success of GPS system. The naval plan is mainly used to provide low dynamic 2D positioning for ships, while the air force plan can provide high dynamic services, but the system is too complex. Because the simultaneous development of the two systems will cause huge costs and the two plans here are designed to provide global positioning, the U.S. Department of Defense combined the two into one in 1973, led by the Joint Satellite Navigation and Positioning Program (JPO) led by the Department of Defense, and set up its office in the Air Force and Space Office in Los Angeles. The agency has many members, including representatives of the United States Army, Navy, Marine Corps, Department of Transportation, National Defense Mapping Agency, NATO and Australia.
Read recommendations:
G183 serials -JOBD GPS Tracker
How to solve the car GPS positioner?fleet management software webfleet solutions
Last article:Development of vehicle GPS
Next article:What are the components of GPS
Related Information
fleet gps trackers sales
2023-04-23Special Looks GPS Tracker PCBA
2023-03-16gps vehicle tracker Production
2023-04-11portable gps tracker distributors
2023-03-16mini gps tracker distributors
2023-04-23Car gps tracking price
2023-04-11real-time gps tracking custom
2023-04-23simple gps tracking Factory
2023-04-23portable gps tracker
2023-03-16Gps speed limiter company
2023-04-23G900LS 8 Lines-4G Car GPS Tracker
2025-03-31G500L -4G OBD GPS Tracker
2022-09-06P60L Personal gps tracker
2022-06-21G900LS-4G Car GPS Tracker
2023-10-06G02M Pet Tracker
2022-06-19Strong magnetic wireless gps tracker G11A
2022-09-09Car GPS system
2023-02-09Differences between GPS cold start and hot start
2022-12-30How is GPS positioned?
2023-02-21The difference between cylindrical lithium battery and polymer soft packed lithium battery
2022-10-18Why does China's Beidou satellite still use GPS positioning system.gps tracker for trailer Factory
2023-09-12Overview of GPS Vehicle System.portable gps tracker price
2023-08-11mini gps tracker.GPS Vehicle Management for Vehicle Safety Management
2023-10-25GPS ground control station.gps tracker with magnet Manufacturing
2023-08-22GPS Logistics Tracking and Monitoring Application Solution
2023-02-02Where is the car GPS locator usually installed in a car?plug & play Obd gps tracker distributors
2023-03-25GPS Earth Coordinate Series Brief description
2023-02-10The Application of GPS in Automobile Tracker.gps tracker for trailer distributors
2023-08-25GPS emergency positioning and assistance products for the elderly.4G GPS Tracker for vehicles distri
2023-08-17How to choose the GPS locator of a car loan?obd2 tracker Manufacturing
2023-03-15