Improvement of DGPS Positioning Accuracy for Low Cost Receiver Using FKP Correction Message

J. Kim, J. Song, H. No, C. Kee, M. Yang, M. Park, S. Lee

Abstract:	In present, it is possible to get positioning accuracy for keeping the road with commercial receiver equipped in car navigation. However, in future, users are looking forward to more precise positioning accuracy for keeping the lane of the road. In the view of mass production, reasonable priced GPS-IMU system is suitable and necessary to develop to achieve this accuracy. For GPS part of GPS-IMU system, conventional DGPS position accuracy should be improved. Differential Global Positioning System (DGPS) is one of the most popular enhancements for commercial GPS receivers. It uses a precisely fixed reference station coordinate to correct user’s position accurately by broadcasting the differential correction. In DGPS system, there is significant assumption that there would be common errors between reference station and user if user was close to reference station. However, Common errors are not absolutely equal because of spatial decorrelation which causes cm level of bias error. FKP is one of Network-RTK (Real Time Kinematic) methods and can deal with this spatially decorrelated error. It is not commonly used for pseudorange measurements because they have meter level of noise much bigger than bias error due to spatial decorrelation. In this paper, we have researched FKP to improve DGPS position accuracy dealing with spatial decorrelation. We designed FKP-DGPS algorithm and carried out static test to verify this algorithm. Then, we confirmed static test results such as standalone, DGPS and FKP-DGPS horizontal position accuracy. In the result, FKP-DGPS improved DGPS position accuracy by 10% and 60% for 1CEP and bias errors respectively. Therefore, we checked the feasibility for GPS receiver which is single frequency and low priced.
Published in:	Proceedings of the 2014 International Technical Meeting of The Institute of Navigation January 27 - 29, 2014 Catamaran Resort Hotel San Diego, California
Pages:	292 - 296
Cite this article:	Kim, J., Song, J., No, H., Kee, C., Yang, M., Park, M., Lee, S., "Improvement of DGPS Positioning Accuracy for Low Cost Receiver Using FKP Correction Message," Proceedings of the 2014 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2014, pp. 292-296.
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