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:
Next article:International GPS development
Related Information
gps tracker for kids
2023-04-11realtime gps tracker online wholesale
2023-04-23Pet GPS Tracker Factory
2023-03-16fleet management software webfleet solutions
2023-03-16Dog gps tracker Vendor
2023-04-23pet gps tracker cat manufacture
2023-03-16Gps speed limiter maker
2023-04-23Pet GPS Tracker Vendor
2023-03-16vehicle gps tracker webfleet solutions
2023-04-11Magnetic gps tracker
2023-03-16G200NY -Cow/Camel GPS Tracker
2022-06-21TK100 (GT06) Vehicle Tracker
2022-06-203 Years Disposable Asset GPS Tracker
2025-03-31G03
2022-06-21G900LM-4G Car Mini GPS Tracker
2025-03-25Introduction to GPS Positioning Principles.gps tracker no monthly fee Processing
2023-04-20Application in emergencies GPS.plug & play Obd gps tracker Production
2023-05-06Correct method of using GPS receiver in the field.plug & play Obd gps tracker manufacture.realti
2023-04-13Differences between GPS cold start and hot start
2022-12-30Types of GPS Chips Used in Common GPS Receivers
2022-08-17GPS module.gps vehicle tracker Solution
2023-07-12GPS early warning device
2023-06-02China Beidou will provide positioning and alarm services to the world
2023-02-15The difference between GPS positioning and GPS navigation tools.plug & play Obd gps tracker supp
2023-05-09What are the GPS signals
2022-09-22How to install and use the Beidou GPS positioner?gps tracker for trailer Manufacturing
2023-04-14Benefits of GPS locators for cattle/sheep grazing
2023-02-21Electric car is equipped with GPS positioning function and recovered the same day after being stolen
2022-08-11Introduction to GPS Positioning Principles.car gps tracker manufacture
2023-04-19Where is the car GPS locator usually installed in a car?plug & play Obd gps tracker distributors
2023-03-25