source:truck tracking webfleet solutions release time:2022-12-29 Hits: Popular:realtime gps tracker online

At the end of the 1950s, the former Soviet Union launched the first man-made earth satellite of mankind. American scientists discovered the phenomenon of Doppler frequency shift in their tracking and research, and used this principle to promote the establishment of the Doppler satellite navigation and positioning system TRANsIT, which has achieved great success in military and civil aspects. It is a leap in the history of navigation and positioning. China has also introduced several Doppler receivers, which are used in island joint survey Earth exploration and other fields. However, due to the low orbit height and signal carrier frequency of the Doppler satellite, it is difficult to improve the orbit accuracy, which makes the positioning accuracy low to meet the requirements of geodesy or engineering survey, and it is impossible to apply it to the research of astrogeodynamics. In order to improve the accuracy of satellite positioning, the United States began to build the Global Positioning System (GPS) in 1973. After entering the phase of scheme demonstration and system test, the official working satellite was launched in 1989, and was completed and put into use in 1994. The space part of the GPS system is composed of 21 satellites, which are evenly distributed on 6 orbital planes. The ground height is more than 20000 km, the orbital inclination is 55 degrees, the flat heart rate is about 0, and the period is about 12 hours. The satellite transmits carrier signals of two bands to the ground. The carrier signal frequencies are 1575.442 MHz (L1 band) and 1227.6 MHz (L2 band) respectively. The satellite is equipped with atomic clocks with high accuracy to ensure the stability of the frequency, The broadcast ephemeris representing satellite position, C/A code and P code used for ranging, and other system information are modulated on the carrier wave, which can provide high-precision, all-weather, continuous, real-time three-dimensional velocity measurement, three-dimensional positioning, and time service to any number of users worldwide.
The control part of the GPS system consists of five monitoring stations located in the United States. These stations continuously observe the GPS satellites and update the calculated and predicted information from the injection station to the satellite information.
Read recommendations:
simple gps tracking distributors
TK100N- Multi functional GPS Tracker
Next article:International GPS development
Related Information
Asset GPS Tracker
2023-04-11pet gps tracker cat price
2023-03-164G GPS Tracker for vehicles sales
2023-04-23fleet gps trackers sales
2023-04-234G GPS Tracker for vehicles wholesale
2023-04-23pet gps tracker cat distributors
2023-03-16realtime gps tracker online Factory
2023-04-23fleet gps trackers company
2023-04-234G GPS Tracker for vehicles Processing
2023-04-23gps tracker no monthly fee supplier
2023-03-16personal gps tracker Production
2022-09-06G900LS 8 Lines-4G Car GPS Tracker
2025-03-31TK200AM-Disposable GPS Tracker
2022-06-21P901 4G ID Card GPS Tracker Smart Walkie-talkie
2025-07-11TK100 (GT06) Vehicle Tracker
2022-06-20GPS satellite positioning is an inevitable trend
2023-02-23Types of GPS
2022-08-17Car GPS positioning system.portable gps tracker Vendor
2023-05-26Manufacturer introduces the main classification of driving recorders.GPS Tracker for vehicles distri
2023-04-15GPS military application introduction.realtime gps tracker online supplier
2023-05-06Several principles for car navigation purchase.plug & play Obd gps tracker supplier
2023-04-08mini gps tracker.Can car GPS locators be installed on motorcycles
2023-10-24GPS positioning mode
2022-10-22The combination of GPS and GIS.realtime gps tracker online wholesaler
2023-05-06GPS area measuring instrument.trailer gps tracker supplier
2023-07-19Anti -theft installation and operation introduction of automobile car GPS positioner.gps tracker no
2023-04-04Do you know the working principle of the pet GPS positioner?realtime gps tracker online wholesaler
2023-03-10GPS four arm spiral antenna
2022-11-23What are GPS satellite tracks?
2022-10-26Gps speed limiter.The History and Future of GPS
2023-11-09