Journal of Positioning, Navigation, and Timing (J Position Navig Timing; JPNT)
Citation: Kim, S.-K., Bu, S.C., Lee, C., Kim, B., & Kim, D. 2023, Carrier Phase Based Cycle Slip Detection and Identification Algorithm for the Integrity Monitoring of Reference Stations, Journal of Positioning, Navigation, and Timing, 12, 359-367.
Journal of Positioning, Navigation, and Timing (J Position Navig Timing) 2023 December, Volume 12, Issue 4, pages 359-367. https://doi.org/10.11003/JPNT.2023.12.4.359
Received on 08 November 2023, Revised on 15 November 2023, Accepted on 17 November 2023, Published on 15 December 2023.
License: Creative Commons Attribution Non-Commercial License (https://creativecommons.org/licenses/bync/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
1Satellite System Laboratory, LIG Nex1, Gyeonggi-do 16911, Korea
2Agency for Defense Development, Daejeon 34186, Korea
†Corresponding Author: E-mail, sukyung.kim@lignex1.com; Tel, +82-31-8038-0142
In order to ensure the high-integrity of reference stations of satellite navigation system, cycle slip should be precisely monitored and compensated. In this paper, we proposed a cycle slip algorithm for the integrity monitoring of the reference stations. Unlike the legacy method using the Melbourne-Wübbena (MW) combination and ionosphere combination, the proposed algorithm is based on ionosphere combination only, which uses high precision carrier phase observations without pseudorange observations. Two independent and complementary ionosphere combinations, Ionospheric Negative (IN) and Ionospheric Positive (IP), were adopted to avoid insensitive cycle slip pairs. In addition, a second-order time difference was applied to the IN and IP combinations to minimize the influence of ionospheric and tropospheric delay even under severe atmosphere conditions. Then, the cycle slip was detected by the thresholds determined based on error propagation rules, and the cycle slip was identified through weighted least square method. The performance of the proposed cycle slip algorithm was validated with the 1 Hz dual-frequency carrier phase data collected under the difference levels of ionospheric activities. For this experiment, 15 insensitive cycle slip pairs were intentionally inserted into the raw carrier phase observations, which is difficult to be detected with the traditional cycle slip approach. The results indicate that the proposed approach can successfully detect and compensate all of the inserted cycle slip pairs regardless of ionospheric activity. As a consequence, the proposed cycle slip algorithm is confirmed to be suitable for the reference station where real time high-integrity monitoring is crucial.
GNSS, Cycle-Slip, integrity monitoring, DQM, reference station, ionosphere combination, Geometry-Free combination, Melbourne-Wübbena combination
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본 연구는 2022년 정부(방위 사업청)의 재원으로 국방과학연구소의 지원을 받아 수행되었습니다 (UC2200376D).
Conceptualization, S.-K. Kim and D. Kim; methodology, S.-K. Kim and D. Kim; software, S.-K. Kim and S. C. Bu; validation, S.-K. Kim and B. Kim; formal analysis, S.-K. Kim; investigation, S.-K. Kim and D. Kim; resources, S.-K. Kim and S. C. Bu; data curation, S.-K. Kim and B. Kim; writing— original draft preparation, S.-K. Kim; writing—review and editing, S.-K. Kim, S. C. Bu and C. S. Lee; visualization, S.-K. Kim; Supervision, C. S. Lee.
The authors declare no conflict of interest.