Performance Improvement of Grid Ionospheric Delay Correction Based on Multiple Constellations for Single-Frequency SBAS User

Donguk Kim, Deokhwa Han, Ho Yun, and Changdon Kee, Seungwoo Seo and Junpyo Park

Abstract:	In the next few years, it is possible that GNSS users utilize four or more constellations in order to locate their position. Due to the benefits of multi-constellation concept, the research on the multi-constellation Satellite Based Augmentation System (SBAS) is being emphasized. However, the current SBAS has some limitations to support multiple constellations. The L1/L5 MOPS [1], which has been implemented recently, is one of the methods to overcome the problem about multi-constellation use. Nonetheless, not only GPS-only users but also multi-constellation users who have L1-only capability cannot take advantage of the benefits from multi-constellation. This paper focuses on the performance improvements of the single-frequency SBAS users who cannot receive the corrections for multiple constellations. In order to construct accurate and reliable L1-only SBAS, we need more improved ionospheric delay corrections. Therefore, we analyzed how to generate more reliable ionospheric corrections using multiple constellations. Then we examined the benefits of multi-constellation use through evaluating the performance of accuracy and availability for legacy SBAS (L1 GPS-only) users. According to the simulation results in the Korean Peninsula, the performance of the vertical delay estimate and the Grid Ionospheric Vertical Error (GIVE) was improved about 16% and 31% respectively by using multi-constellation GNSS. The multi-constellation use is a great help to integrity performance improvements in the external station network, especially. Furthermore, through the enhanced ionospheric corrections, the position accuracy was much more improved, and the availability coverage of legacy SBAS users was significantly expanded. In conclusion, these results demonstrated that the SBAS ionospheric delay corrections generated by multiple constellations are quite effective for single-frequency users.
Published in:	Proceedings of the ION 2015 Pacific PNT Meeting April 20 - 23, 2015 Marriott Waikiki Beach Resort & Spa Honolulu, Hawaii
Pages:	169 - 179
Cite this article:	Kim, Donguk, Han, Deokhwa, Yun, Ho, Kee, Changdon, Seo, Seungwoo, Park, Junpyo, "Performance Improvement of Grid Ionospheric Delay Correction Based on Multiple Constellations for Single-Frequency SBAS User," Proceedings of the ION 2015 Pacific PNT Meeting, Honolulu, Hawaii, April 2015, pp. 169-179.
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