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:
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
car gps tracker
2023-04-11simple gps tracking wholesaler
2023-04-23fleet gps tracking Factory
2023-04-234G GPS Tracker for vehicles manufacturer
2023-04-23gps vehicle tracker Vendor
2023-04-23cantrack asset
2023-04-23fleet gps trackers Production
2023-04-23Magnetic gps tracker price
2023-04-23car gps tracker Vendor
2023-04-23GPS Tracker price
2023-04-11G500M-Mini GPS Tracker
2022-06-20G03
2022-06-2110000mAh Magnetic Asset GPS Tracker
2025-04-08G200NY -Cow/Camel GPS Tracker
2022-06-21Mini Sized GPS Tracker PCBA
2022-06-17Application of GSM Network Communication in Vehicle Positioning System
2022-07-12Application of GPS Positioning Technology in Network Security
2022-11-25Micro Tracking Locator
2022-09-21What cards do car GPS positioners generally use
2023-03-07Factors related to GPS satellites
2022-10-10Main features of gps tracker
2022-09-19How to install and use the car GPS positioner
2023-02-14The role and functional characteristics of installing a GPS positioning system for taxis.gps vehicle
2023-10-07The hidden installation location of the wireless car GPS positioner.plug & play Obd gps tracker
2023-03-28Beidou Navigation GPS
2022-09-27gps vehicle tracker.The role of installing GPS satellite positioning devices in the sales and leasin
2023-10-27Civil GPS
2022-12-28GPS is classified by the working principle of the receiver.obd2 gps tracker verizon sales
2023-06-05What are the different types of car GPS?
2023-06-15GPS predecessor.4G GPS Tracker
2023-09-04