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:
TK200AM-Disposable GPS Tracker
How to measure radar, GPS, Beidou and radio positioning.gps tracker for trailer Processing
GPS positioning manufacturer compares car navigation and mobile navigation.gps tracker no monthly fe
Next article:International GPS development
Related Information
cat gps tracker custom
2023-04-11mini gps tracker Solution
2023-04-23fleet gps trackers Processing
2023-04-23Car gps tracking wholesale
2023-04-23obd2 tracker wholesale
2023-03-16Dog gps tracker Vendor
2023-04-23gps vehicle tracker wholesale
2023-04-114G GPS Tracker for vehicles
2023-03-16fleetmanagement webfleet solutions
2023-03-16mini gps tracker manufacturer
2023-04-23G03
2022-06-21G09L -6 inch Tail light tracker
2022-06-20G06L
2022-06-21TK200AM-Disposable GPS Tracker
2022-06-21TK08A Motorcycle GPS Tracker
2022-06-20The choice of GPS hardware architecture
2022-09-01Review of GPS development in the past ten years
2022-12-20Brief analysis of problems and solutions of vehicle location tracker.realtime gps tracker online Pro
2023-03-13How to install and use the Beidou GPS positioner?gps tracker for trailer Manufacturing
2023-04-14V2V technology combined with GPS technology and wireless communication technology
2022-12-12How to use the car GPS positioner after installation?plug & play Obd gps tracker Processing
2023-03-28Gps speed limiter.Can agricultural vehicles such as tractors be equipped with GPS positioning system
2023-11-09GPS signal is briefly introduced
2022-11-02Six characteristics of GPS
2022-10-12The choice of GPS hardware architecture
2022-09-01Differences between GPS monitoring platform BS and CS
2022-12-14GPS location service.personal gps tracker distributors
2023-05-24Introduction to the Functions of GPS/Beidou Satellite Positioning Vehicle Travel Recorder.Car gps tr
2023-09-05Simulator test GPS
2022-10-10About GPS Drift
2022-08-19