Improvement of GPS positioning accuracy when utilizing Klobuchar model with ionospheric conditions in Thailand

2016 ◽  
Author(s):  
Sutat Jongsintawee ◽  
Sarawoot Runraengwajiake ◽  
Pornchai Supnithi ◽  
Chaiwat Panachart
Keyword(s):  
Positioning Accuracy ◽  
Gps Positioning ◽  
Klobuchar Model

Study on the Application of Computer in the Taxi Intelligent Management System

2014 ◽  
Vol 945-949 ◽  
pp. 3364-3368
Author(s):  
Min Fan
Keyword(s):  
System Integration ◽  
Management System ◽  
Evaluation System ◽  
Service Evaluation ◽  
Time Sharing ◽  
Start Time ◽  
Positioning Accuracy ◽  
Safe Driving ◽  
Gps Positioning ◽  
Intelligent Terminal

the taxi intelligent terminal management system using the latest GPS and Beidou Positioning Technology and network technology, embedded programming technology, Windows CE terminal operating system, cloud computing technology, the original taxi valuation multiple system, GPS positioning system, the taxi service evaluation system, intelligent light system, monitoring system and one card system. Integration, design a set of complete city taxi intelligent terminal management system, to achieve a high level of management. Double backup location system using GPS positioning and Chinese Beidou Positioning, positioning accuracy, reliable, real-time operational data store upload taxi and reliable data, which can realize safe driving record, automobile security alarm, accident alarm and anti-theft alarm and tracking and control, in the taxi can achieve "flat-share carpool", can realize the time-sharing, people, time, metering and billing and other functions, and improves the bearing rate of the vehicle, more energy saving and environmental protection. The system has broad application prospects and the market space. The system will realize some technical indicators: receive 10 channels, the positioning accuracy of <5 meters, the cold start time <30 seconds, hot start time <3 seconds, GPS relocation time <30 seconds.

Experimental Study on Accuracy of GPS Positioning

2012 ◽  
Vol 263-266 ◽  
pp. 346-349 ◽  
Author(s):  
Hong Shi ◽  
Dong Hai Qiao
Keyword(s):  
Global Positioning System ◽  
Small Area ◽  
Positioning System ◽  
Gps Receiver ◽  
Positioning Accuracy ◽  
Gps Positioning ◽  
Global Positioning ◽  
Open Ground ◽  
Geophysical Measurement ◽  
Measured Distance

Geophysical measurement relies on the positioning accuracy of GPS (global positioning system). Usually the positioning accuracy is area dependent. This paper uses a commercially available GPS receiver to verify its positioning accuracy with practical measurement in a small area. With a measurement setup in an open ground, the results show that even for the fixed point, the GPS measured positioning error of about 0.234 meter could be observed for a period of time. Of 12 GPS measured distance errors, only one is about 5.7 meters, all others are within the range of 3-5 meters of GPS receiver specification.

Investigation of GPS positioning accuracy during the seasonal variation

Measurement ◽  
2014 ◽  
Vol 53 ◽  
pp. 91-100 ◽  
Author(s):  
U. Dogan ◽  
M. Uludag ◽  
D.O. Demir
Keyword(s):  
Seasonal Variation ◽  
Positioning Accuracy ◽  
Gps Positioning

scholarly journals Smartphone Positioning and Accuracy Analysis Based on Real-Time Regional Ionospheric Correction Model

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3879
Author(s):  
Qi Liu ◽  
Chengfa Gao ◽  
Zihan Peng ◽  
Ruicheng Zhang ◽  
Rui Shang
Keyword(s):  
Real Time ◽  
Convergence Time ◽  
Electron Content ◽  
Ionospheric Model ◽  
Positioning Accuracy ◽  
Correction Model ◽  
The Real ◽  
Gnss Positioning ◽  
Klobuchar Model ◽  
Regional Ionospheric Model

As one of the main errors that affects Global Navigation Satellite System (GNSS) positioning accuracy, ionospheric delay also affects the improvement of smartphone positioning accuracy. The current ionospheric error correction model used in smartphones has a certain time delay and low accuracy, which is difficult to meet the needs of real-time positioning of smartphones. This article proposes a method to use the real-time regional ionospheric model retrieved from the regional Continuously Operating Reference Stations (CORS) observation data to correct the GNSS positioning error of the smartphone. To verify the accuracy of the model, using the posterior grid as the standard, the electron content error of the regional ionospheric model is less than 5 Total Electron Content Unit (TECU), which is about 50% higher than the Klobuchar model, and to further evaluate the impact of the regional ionosphere model on the real-time positioning accuracy of smartphones, carrier-smoothing pseudorange and single-frequency Precise Point Positioning (PPP) tests were carried out. The results show that the real-time regional ionospheric model can significantly improve the positioning accuracy of smartphones, especially in the elevation direction. Compared with the Klobuchar model, the improvement effect is more than 34%, and the real-time regional ionospheric model also shortens the convergence time of the elevation direction to 1 min. (The convergence condition is that the range of continuous 20 s is less than 0.5 m).

scholarly journals Influence of the Ionospheric Delay on Designation of an Aircraft Position

2020 ◽  
Vol 22 (3) ◽  
pp. 3-10
Author(s):  
Janusz Cwiklak ◽  
Marek Grzegorzewski ◽  
Kamil Krasuski
Keyword(s):  
Accurate Solution ◽  
Ionospheric Delay ◽  
Ionospheric Correction ◽  
Positioning Accuracy ◽  
Research Results ◽  
Differential Technique ◽  
Ionospheric Models ◽  
Klobuchar Model ◽  
Gps System

The article presents and describes research results concerning determination of an impact of the ionospheric correction upon the positioning accuracy of an aircraft. The main objective of examinations was to verify three ionospheric models (the Klobuchar model, SBAS model and IONEX model) in determining aircraft coordinates. In the framework of the conducted simulations, the authors determined the aircraft coordinates by means of the SPP code method in the GPS system. The article presents a comparison of the determined aircraft coordinates in the SPP code method in relation to an accurate solution in the RTK-OTF differential technique. Based on the obtained results, it was found that e use of the SBAS and IONEX model is exploited to improve the positioning accuracy of an aircraft in relation to the Klobuchar model, from 20% to 72%, in the geocentric XYZ frame. The obtained findings of a simulation indicate that the ionospheric correction in the SBAS and IONEX models may be used to improve the performance of aircraft coordinates in air navigation.

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