source:Industry News release time:2022-11-02 Hits: Popular:realtime gps tracker online

The basic principle of GPS navigation system is to measure the distance between the known position of the satellite and the user's receiver, and then integrate the data of multiple satellites to know the specific position of the receiver. To achieve this, the position of the satellite can be found in the satellite ephemeris according to the time recorded by the onboard clock. The distance between the user and the satellite is obtained by recording the time the satellite signal travels to the user and multiplying it by the speed of light (due to the interference of the ionosphere of the atmosphere, this distance is not the real distance between the user and the satellite, but the pseudoran distance (PR) : When the GPS satellite is working properly, it will continuously send navigation messages using pseudo-random codes (pseudo-codes) composed of 1 and 0 binary symbols. There are two types of pseudocodes used in GPS systems, namely C/A code for civilian use and P(Y) code for military use. C/A code frequency 1.023MHz, repetition period of one millisecond, code spacing of 1 microsecond, equivalent to 300m; The P code frequency is 10.23MHz, the repetition period is 266.4 days, and the code spacing is 0.1 microseconds, which is equivalent to 30m. And Y code is formed on the basis of P code, the secrecy performance is better. Navigation messages include satellite ephemeris, working conditions, clock correction, ionospheric delay correction, atmospheric refraction correction and other information. It is modulated from the satellite signal and transmitted at 50b/s modulated on the carrier frequency. Each main frame of a navigation message contains 5 sub-frames, each 6s in length. The first three frames are 10 characters each; Repeat every 30 seconds and update every hour. The last two frames total 15000b. The content of navigation message mainly includes telemetry code, conversion code, data block 1, 2 and 3, among which the most important is ephemeris data. When the user receives the navigation message, the distance between the satellite and the user can be obtained by extracting the satellite time and comparing it with his own clock. Then the satellite ephemeris data in the navigation message can be used to calculate the position of the satellite when the message is sent, and the position and velocity of the user in the WGS-84 geodetic coordinate system can be obtained.
Read recommendations:
VSL100 GPS Speed Limiter, Speed Governor
Why does China Beidou dare to compete with the first tier GPS team?
Manufacturer introduces in detail the component of the car positioner.simple gps tracking wholesale
Last article:Domestic GPS Function
Next article:What are the main characteristics of GPS technology?
Related Information
truck tracking webfleet solutions
2023-03-16GPS Tracker company
2023-04-11pet gps tracker cat supplier
2023-03-164G GPS Tracker for vehicles company
2023-04-23cat gps tracker sales
2023-04-11simple gps tracking custom
2023-04-23fleet gps tracking price
2023-04-23gps tracker app price
2023-04-11personal gps tracker wholesaler
2023-03-16simple gps tracking manufacturer
2023-04-23GF30 Magnet GPS tracker with Voice listen
2022-06-21P02L Smart Walkie-Talkie Tracker
2025-09-1910000mAh Magnetic Asset GPS Tracker
2025-04-08TK100N- Multi functional GPS Tracker
2023-10-06G500M-Mini GPS Tracker
2022-06-20About GPS Drift
2022-08-19GPS Accessories FAQ
2022-08-08What is GPS?
2022-07-13GPS's military development introduction.obd2 gps tracker verizon Manufacturing
2023-05-06Bluetooth GPS technology
2022-10-19How to use the car GPS positioner after installation?plug & play Obd gps tracker Processing
2023-03-28Gps speed limiter.Analysis of GPS positioning requirements for official vehicles
2023-10-27GPS navigator
2022-10-14Instructions for Wiring Harness Positioning and Wiring of Beidou Automobile Travel Recorder Terminal
2023-09-19LBS(Galileo) positioning
2022-10-25Features and functions of in car GPSD
2023-07-27Recommended Minimum Specific GPS/TRANSIT Data (RMC) GPS recommended positioning information
2022-09-28The difference between GPS positioner and GPS navigator.GPS Tracker for vehicles manufacturer
2023-04-07Application scenarios of GPS technology.4G GPS Tracker for vehicles Processing
2023-08-17mini gps tracker.GPS positioning terminal selection and fixation
2023-10-14