source:truck tracking webfleet solutions release time:2023-06-14 Hits: Popular:realtime gps tracker online
1. Principle of position difference
This is the simplest differential method, and any GPS receiver can be modified and composed of this differential system. After observing four satellites, the GPS receiver installed on the reference station can perform three-dimensional positioning and calculate the coordinates of the reference station. Due to orbital errors, clock errors, SA effects, atmospheric effects, multipath effects, and other errors, the calculated coordinates are different from the known coordinates of the reference station, and there is a difference. The reference station uses a data link to send out this correction number, which is received by the user station, and corrects the calculated user station coordinates.
The final corrected user coordinates have eliminated the common errors between the reference and user stations, such as satellite orbit errors, SA effects, atmospheric effects, etc., improving positioning accuracy. The above prerequisite is for the observation of the same group of satellites by both the reference station and the user station. The position difference method is suitable for situations where the distance between the user and the reference station is within 100km.
2. Pseudorange difference principle
Pseudorange difference is currently the most widely used technique. Almost all commercial differential GPS receivers use this technology. The RTCM SC-104 recommended by the International Maritime Radio Commission also adopts this technology.
The receiver on the reference station requires the distance from it to the visible satellite and compares the calculated distance with the measurement value containing errors. Utilize a α-β The filter filters this difference and calculates its deviation. Then, the ranging errors of all satellites are transmitted to the user, who uses this ranging error to correct the measured pseudo range. Finally, users can use the corrected pseudo distance to solve their own position, which can eliminate common errors and improve positioning accuracy.
Similar to position difference, pseudo range difference can cancel out the common error between two stations, but as the distance from the user to the reference station increases, system error occurs, which cannot be eliminated by any difference method. The distance between the user and the reference station has a decisive impact on accuracy.
3. Principle of carrier phase difference
Carrier phase difference technology, also known as RTK (real time kinetics), is based on real-time processing of the carrier phases of two measurement stations. It can provide real-time three-dimensional coordinates of observation points and achieve high-precision at the centimeter level.
Read recommendations:
G09L -6 inch Tail light tracker
Where is the car GPS locator usually installed in a car?plug & play Obd gps tracker distributors
Last article:GPS positioning manufacturers introduce the composition of satellite positioning systems.Dog gps tra
Next article:What are the main parts of the receiver of the car GPS
Related Information
GPS Tracker for vehicles Manufacturing
2023-03-16mini gps tracker distributors
2023-04-23Dog gps tracker price
2023-04-23mini gps tracker maker
2023-04-23fleet gps tracking manufacture
2023-04-23fleet gps trackers custom
2023-04-23real-time gps tracking price
2023-04-23fleet gps tracking maker
2023-04-23gps tracker app distributors
2023-04-23Car gps tracking wholesale
2023-04-233 Years Disposable Asset GPS Tracker
2025-03-31TK103B
2022-06-20GF20-Mini Magnet GPS Tracker
2022-06-2110000mAh Magnetic Asset GPS Tracker
2025-04-08VSL100 GPS Speed Limiter, Speed Governor
2022-06-19Beidou GPS Navigation System - Future development
2022-10-20GPS tracking monitoring promotes mobile logistics management
2022-08-17Factors related to GPS satellites
2022-09-22Schematic diagram of GPS satellite navigation system
2022-11-25GPS increases value for customers
2023-02-02How to use GPS car tracker.realtime gps tracker online wholesale
2023-04-15The main role of driving recorder.gps tracker with magnet Manufacturing
2023-04-15How to buy GPS.Magnetic gps tracker manufacturer
2023-05-24Gps speed limiter.How to use mobile phones to locate and track vehicles with GPS installed
2023-10-25GPS monitoring information platform ensures smooth traffic
2022-12-17Composition of GPS system
2022-08-12GPS data
2022-10-22The manufacturer believes how to effectively prevent the vehicle positioning system from being destr
2023-05-10GPS four arm spiral antenna
2022-11-23GPS Development.gps tracker for trailer distributors
2023-09-09