A study on cycle slip detection and correction in case of ionospheric scintillation

Ji, Shengyue; Chen, Wu; Weng, Duojie; Wang, Zhenjie; Ding, Xiaoli

doi:10.1016/j.asr.2012.10.012

Cited by 30 publications

(19 citation statements)

References 8 publications

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“…This makes it one of the most difficult situations to detect CSs reliably. To solve the CSs detection failures under disturbed ionospheric conditions, a variety of procedures have been proposed in recent years [ Banville and Langley , ; Cai et al , ; Ji et al , ; Zhang et al , ], but we ignore if they are able to solve extreme and combined events like the one studied in this work which still can induce errors in PPP. It is noteworthy that in this paper we analyze data with 30 s sampling rate and that considering higher rate (e.g., 1 s) would prevent the SITEC related problems in the CS detection.…”

Section: Discussionmentioning

confidence: 99%

Precise point positioning performance in the presence of the 28 October 2003 sudden increase in total electron content

et al. 2015

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Intense disturbances in the ionosphere may produce perturbations in Global Navigation Satellite Systems (GNSS) radio signals that in the most severe cases produce receiver tracking problems, which in turn impact on GNSS positioning accuracy. In this paper we present a case study related to the sudden increase in total electron content (SITEC) induced by the X17.2 solar flare that occurred on 28 October 2003. This is the largest SITEC ever recorded by means of the rate of change of total electron content. A solar radio burst (SRB) occurred in the same period which caused GNSS signal fading and in some cases complete signal loss. Although SITEC contribution to the signal noise cannot be separated from that of SRB, in this paper we show that accuracy degradation may happen in kinematic precise point positioning (PPP) in several stations of the sunlit hemisphere when 30 s sampling rate data are analyzed. The observed errors in the position are the result of the difficulties that cycle slip (CS) detection strategies have to deal with the observables that have been affected by the SITEC.

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Section: Discussionmentioning

confidence: 99%

Precise point positioning performance in the presence of the 28 October 2003 sudden increase in total electron content

et al. 2015

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“…According to Ji et al (2013), the ionospheric condition around the polar area is often active. Figure 2 illustrates the cycle slips in BDS C04 carrier phase observations, which are collected at Antarctic station CAS1 with 30-s sampling rate over a period of 24 h. On the one hand, the HMW combination series reveal these cycle slips are small and hard to be detected by the traditional TurboEdit algorithm.…”

Section: Extensive 1-cycle Slips In Beidou Geo Observationsmentioning

confidence: 99%

Enhanced cycle slip detection method for dual-frequency BeiDou GEO carrier phase observations

Chang

et al. 2017

GPS Solut

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Cycle slip detection is one of the essential steps for high-precision GNSS data processing when carrier phase observations are involved, such as in precise point positioning (PPP) and precise orbit determination (POD). A number of algorithms have been developed since the 1980s and are effective for processing dual-frequency GPS. However, the emerging BeiDou navigation satellite system in China brings some new challenges for these existing algorithms, especially when small cycle slips occur more frequently. In this study, a large number of 1-cycle slips have been found in low-elevation BeiDou GEO carrier phase observations, which are collected by receivers of the IGS multi-GNSS experiment. Such small cycle slips should be identified and repaired, if possible, before PPP and POD processing. We propose an enhanced cycle slip detection method based on the series of dual-frequency phase geometry-free combinations. A robust polynomial fit algorithm and a general autoregressive conditional heteroskedastic modeling technique is employed to provide an adaptive detection threshold, which allows identification of such small cycle slips with high reliability. Simulated and real data tests reveal that the proposed method has both high sensitivity and low false-alarm rate even in the case of ionospheric scintillation.

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“…The impact of traveling ionosphere disturbances on cycle slip detection was analyzed by Tang et al [16] using dual-frequency geometry-free combinations. Ji et al [17] tried to expand the high-order differencing method to the scenario of ionospheric scintillation by introducing a non-geometry-free but ionosphere-free dual-frequency combination, but their method may not be very reliable according to their detection results. Liu [18] detected the cycle slips by calculating the difference between ionospheric total electron contents rate of the current epoch and that predicted by previous epochs.…”

Section: Literature Reviewmentioning

confidence: 99%

Cycle Slip Detection during High Ionospheric Activities Based on Combined Triple-Frequency GNSS Signals

et al. 2019

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The current cycle slip detection methods of Global Navigation Satellite System (GNSS) were mostly proposed on the basis of assuming the ionospheric delay varying smoothly over time. However, these methods can be invalid during active ionospheric periods, e.g., high Kp index value and scintillations, due to the significant increase of the ionospheric delay. In order to detect cycle slips during high ionospheric activities successfully, this paper proposes a method based on two modified Hatch–Melbourne–Wübbena combinations. The measurement noise in the Hatch–Melbourne–Wübbena combination is minimized by employing the optimally selected combined signals, while the ionospheric delay is detrended using a smoothing technique. The difference between the time-differenced ambiguity of the combined signal and this estimated ionospheric trend is adopted as the detection value, which can be free from ionospheric effect and hold the high precision of the combined signal. Five threshold determination methods are proposed and compared to decide the cycle slip from the magnitude aspect. This proposed method is tested with triple-frequency Global Navigation Satellite System observations collected under high ionospheric activities. Results show that the proposed method can correctly detect and fix cycle slips under disturbed ionosphere.

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A study on cycle slip detection and correction in case of ionospheric scintillation

Cited by 30 publications

References 8 publications

Precise point positioning performance in the presence of the 28 October 2003 sudden increase in total electron content

Precise point positioning performance in the presence of the 28 October 2003 sudden increase in total electron content

Enhanced cycle slip detection method for dual-frequency BeiDou GEO carrier phase observations

Cycle Slip Detection during High Ionospheric Activities Based on Combined Triple-Frequency GNSS Signals

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