source:truck tracking webfleet solutions release time:2023-02-06 Hits: Popular:realtime gps tracker online
The GPS receiver can receive the time information that can be used to be used for time -to -nano -seconds; it is used to predict the forecast star calendar in the future of satellites in the next few months; , The accuracy is several meters to tens of meters (different satellites are different, change at any time); and GPS system information, such as satellite conditions.
The measurement of the GPS receiver can get the distance from the satellite to the receiver. Because the error containing the receiver satellite clock and the atmospheric dissemination error, it is called a pseudo -distance. The pseudo -tagging distance from 0A is called UA code pseudo -pseudo -pseudo -pseudo -pseudo -pseudo -pseudo -precision is about 20 meters. The pseudo -pseudo distance from P code is called p code pseudo distance, and the accuracy is about 2 meters.
The GPS receiving machine decodes or uses other technologies for the receiving satellite signals. After removing the information on the carrier, the carrier can be restored. Strictly speaking, the carrier phase should be called the carrier frequency phase. It is the difference between the signal phase of the satellite signal carrier of the Doppler frequency transparent and the receiving machine. Generally, the number of times of calendar time determined by the receiver clock and maintaining the tracking of satellite signals can record the change value of the phase, but the initial value of the receiver and the satellite oscillator when you start observation is unknown. The phase integer of the original element is also unknown, that is, the fuzzyness of the week, and can only be used as a parameter in data processing. The accuracy of the phase observation value is as high as millimeter, but the premise is to solve the fuzzyness of the entire week. Therefore, the phase observation value can be used only when the relative positioning and a continuous observation value can be used. Can use phase observation values.
According to the positioning method, GPS positioning is divided into single -point positioning and relative positioning (differential positioning). The single -point positioning is to determine the position of the receiving machine based on the observation data of a receiver. It can only use a pseudo -distance observation capacity, which can be used for rough navigation positioning of vehicles and boats. Relative positioning (differential positioning) is the method of determining the relative position between the observation points based on the observation data of the receiver of the two or more. Use phase observation values for relative positioning.
In the GPS observation volume, the bell difference, atmospheric transmission, and multi -path effects of satellite and receiving machines are included in the GPS observation measurement. When the positioning is calculated, the satellite broadcasting star calendar error should be affected. Cancel off or weakening, so the positioning accuracy will be greatly improved. The dual -frequency receiver can offset the main part of the ionization error of the atmosphere in the atmosphere according to the observation of the two frequencies. ), A dual -frequency receiver should be selected.
When the positioning observation, if the receiver is moved by the surface of the earth, it is called dynamic positioning. If the accuracy of a rough navigation positioning for vehicles and boats is a pseudo -distance single -point positioning of 30 to 100 meters, or for urban vehicle navigation positioning The pseudo -distance differential positioning of the rice -level accuracy, or the centimeter -level phase differential positioning (RTK) used to measure the sample, and calculate the observation data of two or more stations in real time. When the positioning observation, if the receiver is static relative to the surface of the earth, it is called a static positioning. When the control network observation is performed, this method is generally observed by several receivers at the same time. Positioning accuracy, which is dedicated to this purpose, is called a earth -type receiver, and is the best performance in the receiver. At present, GPS has been able to meet the accuracy requirements of crustal transformation observation. IGS's perennial observation platform has a global coordinate framework that can form a millimeter level.
Read recommendations:
4G GPS Tracker for vehicles Factory
Navigation editor introduces the usage method of driving recorder.gps tracker for kids supplier
Last article:Precautions for car GPS applications
Next article:GPS positioning system development trend
Related Information
trailer gps tracker Factory
2023-04-23car gps tracker Production
2023-04-23fleet gps trackers
2023-03-16Gps speed limiter equipment
2023-04-23car gps tracker Vendor
2023-04-23CantrackGPS
2023-03-16simple gps tracking supplier
2023-04-234G GPS Tracker distributors
2023-04-23gps tracker für auto supplier
2023-04-23fleet gps trackers price
2023-04-23TK100N- Multi functional GPS Tracker
2023-10-06TK100 (GT06) Vehicle Tracker
2022-06-20G02M Pet Tracker
2022-06-19G183 serials -JOBD GPS Tracker
2022-09-06P60L Personal gps tracker
2022-06-21Disadvantages of Bluetooth GPS receiver.fleet tracking mobile app
2022-11-16Is GPS really powerful?
2023-02-14China Beidou will provide positioning and alarm services to the world
2023-02-15Basic knowledge of GPS satellite positioning system
2022-08-20How to detect whether the car is installed with a GPS locator?obd-II port gps tracker distributors
2023-04-04GPS pseudo-range difference principle
2022-10-11About GPS receiver
2022-12-05Where is the car GPS positioner?
2023-02-22What are the key points for purchasing in car GPS.personal gps tracker Solution
2023-06-16Differences between GPS cold start and hot start
2022-12-01How to position GPS
2023-02-06gps vehicle tracker.How to activate and use a previously installed GPS car locator in the car
2023-10-13Various GPS systems.4G GPS Tracker for vehicles Production
2023-08-22What is the GPS program of Gully?
2023-02-11High precision timing system based on GPSD
2022-11-18