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:
pet gps tracker cat Manufacturing
What positioning is the GPS positioner?
Xiaobian Xiaobian tells you the role of the truck installation of the Beidou positioning system.plug
Last article:Precautions for car GPS applications
Next article:GPS positioning system development trend
Related Information
4G GPS Tracker
2023-04-11real-time gps tracking wholesale
2023-04-234G GPS Tracker Factory
2023-04-23mini gps tracker maker
2023-04-23gps vehicle tracker manufacture
2023-04-11GPS Trackers custom
2023-04-11real-time gps tracking
2023-04-11fleet gps trackers
2023-03-16real-time gps tracking Processing
2023-04-23mini gps tracker company
2023-04-23G500L -4G OBD GPS Tracker
2022-09-06G900LM-4G Car GPS Tracker
2025-03-25G200(L) -Magnet GPS Tracker
2022-06-204G Wired GPS Tracker PCBA
2022-06-1710000mAh Magnetic Asset GPS Tracker
2025-04-08Auto mobile monitoring composition.vehicle gps tracker Manufacturing
2023-05-19Differences between GPS monitoring platform BS and CS
2022-12-14GPS Global Satellite Positioning System
2022-10-10About GPS Drift
2022-08-19About GPS receiver
2022-12-05What should I pay attention to when purchasing GPS products?
2022-11-24Is it really good to install a gps tracker?
2022-09-09GPS space and ground control
2023-06-01GPS parameter.Gps speed limiter Solution
2023-05-25Factors related to GPS satellites
2022-10-10Guidelines for purchasing mortgaged cars - Use of GPS anti-theft devices.personal gps tracker wholes
2023-09-12gps satellite constellation.gps vehicle tracker
2023-09-04Gps speed limiter.Install GPS car locator to avoid vehicle theft and rescue
2023-10-12Positioning system classification.Car gps tracking manufacturer
2023-05-26GPS tracking purchase method.4G GPS Tracker for vehicles Manufacturing
2023-08-17