source:truck tracking webfleet solutions release time:2022-11-01 Hits: Popular:realtime gps tracker online
The first Space Segment mainly consists of 24 satellites operating in semi-synchronous orbit. The so-called semi-synchronous orbit means that it takes about 12 hours (11 hours and 58 minutes) for a satellite to operate a week, so the same satellite happens to appear on the head of a stationary user twice in a day (23 hours and 56 minutes). The 24 satellites are evenly distributed on 6 orbital planes with 4 satellites in each orbit, and each orbital plane has an inclination Angle of 55 degrees from the equator. The average orbital altitude of these satellites is about 20200Km
The ranging signal from the 24 satellites has two channels (D-Band), one is called L1, the transmission frequency is 1575.42MHz; The second is L2 with a transmission frequency of 1227.6MHz. These two carrier frequencies are responsible for transmitting the Spread Spectrum signal as a high frequency carrier. GPS uses spread-spectrum communication (Spread-spectrum) technology. ranging codes modulated by spread spectrum can be divided into two kinds: The first is 1.023MHz C/A codes (coarse/acquisition codes). As the name implies, the precision is coarse according to the code. Moreover, C/A codes are only modulated with L1 and are specially opened to general commercial users. The other ranging Codes are P codes (Precision Codes) of 10.23MHz, which are modulated on both L1 and L2 carriers. Due to the short Chip of P codes, more accurate positioning can be obtained. Both range codes can be used to measure the distance between the satellite and the receiver. However, usually P codes are also encrypted and only available to authorized users, so P codes are usually only used in military positioning systems, and because of these two different sets of codes, GPS is also divided into so-called Standard Positioning Service (SPS) and Precise Positioning Service (PPS). The standard positioning service uses only C/A codes on the L1 carrier. Besides C/A code on L1 carrier and P code on L1 and L2 carrier, the last and most important thing for precise positioning service is a 50Hz data information code. The data contained in this code includes the satellite timing data, the exact satellite orbit data (ephemeris), which contains the orbit data of the satellite transmitting the signal, and the almanac data, which contains the basic orbit data of all the satellites, as well as the ionospheric propagation correction of the signal.
The Control Segment is composed of the various ground control stations located in different locations. Its Master Control Station (MCS) is located in Colorado, USA, and the remaining stations are evenly distributed along the equator. The main task of these ground control stations is to monitor and control these satellites operating in space, its functions include satellite orbit control, satellite orbit data update, satellite itself maintenance and so on. The operation process of this system is that each sub-station receives the orbit data of its locked satellite, then transmits the data to the main control station through the Defense satellite communication system of the United States for the estimation and reprediction of the orbit data, and then uploads the new orbit data to each satellite through the ground antenna station.
The last Segment, the User Segment, is closely related to the general user segment. In fact, the so-called User Segment refers to the GPS receiver, which is the protagonist to be discussed in this paper. Its function is RF receiving, decoding and processing satellite orbit data, so as to calculate the position of the receiver.
Read recommendations:
simple gps tracking Production
G900LS 8 Lines-4G Car GPS Tracker
The difference between GPS positioning and base station positioning.GPS Tracker for vehicles Process
Last article:The traditional architecture of GPS
Next article:GPS Function Introduction
Related Information
Cantrack G05
2023-03-16mini gps tracker wholesaler
2023-04-23OBD GPS Tracker distributors
2023-04-234G GPS Tracker for vehicles
2023-03-164G GPS Tracker for vehicles company
2023-04-23gps vehicle tracker Factory
2023-04-23obd2 gps tracker verizon
2023-03-16GPS Tracker for vehicles Vendor
2023-03-16Magnetic gps tracker
2023-03-16truck tracking webfleet solutions
2023-03-16C32Plus (9~90V E-bikes/Motorcycle/Car gps tracker)
2022-06-21G01 Smallest Personal Old People Mini GPS Tracker for Kids
2022-06-19GF70L-Solar Magnetic Asset GPS Tracker
2023-10-07G03
2022-06-21G09L -6 inch Tail light tracker
2022-06-20Precautions for installation of Beidou 4G wiring GPS positioner.obd-II port gps tracker Manufacturin
2023-03-28Domestic product function
2022-11-01GPS receiver.gps tracker no monthly fee distributors.gps tracker no monthly fee ufacturer
2023-04-13Navigation GPS antenna installation location diagram
2022-08-12GPS Tracking Monitoring Promotes Mobile Logistics Management
2022-12-30There are problems that occur on the four hardware of GPS.obd2 gps tracker verizon distributors
2023-04-14GPS expansion function.gps tracker for Car wholesale
2023-06-21Advantages of Automotive Beidou/GPS Positioning Products.4G GPS Tracker for vehicles supplier
2023-09-15What are the commonly used car GPS positioner?
2023-02-25Global Positioning System
2022-10-12Two Point Application of GPS.obd2 gps tracker verizon manufacturer
2023-08-01The function of the car GPS.gps tracker no monthly fee wholesaler
2023-05-13LBS(Galileo) positioning
2022-10-25GPS system architecture and analysis
2022-09-01The working principle and equipment composition of the GPS positioning management system.obd-II port
2023-05-06