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

Ju, Bing Feng; Gu, Dawu; Chang, Xiao; Herring, T. A.; Duan, Xiaojun; Wang, Zhengming

doi:10.1007/s10291-017-0607-8

Cited by 33 publications

(24 citation statements)

References 18 publications

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“…The above analysis indicates that, under ionospheric scintillation, using the uniform thresholds such as 1 cycle and 0.05 m can induce a high false-alarm rate of cycle-slips especially using GF combination observable. Similar conclusion is also reported by several previous studies [24,38]. From Figure 5, we may also note that the fluctuation intensity of ∆N MW and ∆Φ GF generally depend on the scintillation level.…”

Section: Conventional Cycle-slip Thresholdsupporting

confidence: 91%

“…Under non-scintillation conditions as ROTI < 0.5 TECU/min or even ROTI < 0.1 TECU/min, we can find some anomalous ∆N MW and ∆Φ GF with large values (|∆N MW | > 3 cycles and |∆Φ GF | > 0.6 m), which show the different characteristic compared to the values presented in Figure 5. Several researchers reported that cycle-slips are easily occurred in GEO carrier-phase measurements compared with IGSO and MEO even under normal ionospheric environment [38,39]. The second and third panels of Figure 6 also support such statement.…”

Section: Cycle-slip Threshold Model Under Ionospheric Scintillationsupporting

confidence: 60%

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A Strategy to Mitigate the Ionospheric Scintillation Effects on BDS Precise Point Positioning: Cycle-Slip Threshold Model

Luo¹,

Lou²,

Gu³

et al. 2019

Remote Sensing

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Because of the special design of BeiDou navigation satellite system (BDS) constellation, the effects of ionospheric scintillation on operational BDS generally are more serious than on the global positioning system (GPS). As BDS is currently providing global services, it is increasingly important to seek strategies to mitigate the scintillation effects on BDS navigation and positioning services. In this study, an improved cycle-slip threshold model is proposed to decrease the high false-alarm rate of cycle-slips under scintillation conditions, thus avoiding the frequent unnecessary ambiguity resets in BDS precise point positioning (PPP) solution. We use one-year (from 23 March 2015 to 23 March 2016) BDS dataset from Hong Kong Sha Tin (HKST) station (22.4°N, 114.2°E; geomagnetic latitude: 15.4°N) to model the cycle-slip threshold and try to make it suitable for three types of BDS satellites and multiple scintillation levels. The availability of our mitigation strategy is validated by using three months (from 1 September 2015 to 30 November 2015) BDS dataset collected at 10 global navigation satellite system (GNSS) stations in Hong Kong. Positioning results demonstrate that our mitigated BDS PPP can prevent the sudden fluctuations of positioning errors induced by the ionospheric scintillation. Statistical results of BDS PPP experiments show that the mitigated solution can maintain an accuracy of about 0.08 m and 0.10 m in the horizontal and vertical components, respectively. Compared with standard BDS PPP, the accuracy of mitigated PPP can be improved by approximately 24.1%, 38.2%, and 47.9% in the east, north, and up directions, respectively. Our study demonstrates that considering different scintillation levels to establish appropriate cycle-slip threshold model in PPP processing can efficiently mitigate the ionospheric scintillation effects on BDS PPP.

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Section: Conventional Cycle-slip Thresholdsupporting

confidence: 91%

Section: Cycle-slip Threshold Model Under Ionospheric Scintillationsupporting

confidence: 60%

A Strategy to Mitigate the Ionospheric Scintillation Effects on BDS Precise Point Positioning: Cycle-Slip Threshold Model

Luo¹,

Lou²,

Gu³

et al. 2019

Remote Sensing

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show abstract

“…Therefore, the proposed algorithm has a high reliability under ionospheric disturbances. Ju et al (2017) confirmed that due to constant relative position between receivers and BDS GEO satellites, cycle slip often occurs in GEO satellite observables. Since theoretical performance of IGSO and MEO satellites is similar to that of GEO, we only take GEO satellites as an example to test real cycle slip detection and repair performance.…”

Section: Simulated Cycle Slip Detection and Repair Experimentsmentioning

confidence: 55%

GPS/BDS triple-frequency cycle slip detection and repair algorithm based on adaptive detection threshold and FNN-derived ionospheric delay compensation

Qian¹

2020

Acta Geodynamica Et Geomaterialia

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A refined triple-frequency cycle slip detection and repair algorithm for GPS/BDS undifferenced observables under high ionospheric disturbances is proposed. In this method, three linearindependent optimal observables combinations for GPS/BDS are selected. The residual ionospheric delay estimated from a "calculation-prediction mechanism", namely flexibly determine whether to calculate delay by observables themselves or to predict delay by a feedforward neural network (FNN), is used to compensate for the detection values. Additionally, we devise an adaptive detection threshold based on actual noise level to detect the cycle slip, and adopt the modified least-square decorrelation adjustment (MLAMBDA) to fix integer cycle slip. The performance of the proposed algorithm was tested with observables at 30 s sampling rate in a 2-day geomagnetic storm period. Results showed that the proposed algorithm can detect and repair all kinds of cycle slips as small as one cycle in the case of high ionospheric disturbances. No false repairs are generated despite the occurrence of very few misjudgments.

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“…The first method is called the sample variation method [30], which is to determine the threshold by four times the standard deviation of all the detection values during the observation period. This threshold determination method is simple for calculation and can guarantee a significance level of 0.006%.…”

Section: Determination Of Detection Thresholdmentioning

confidence: 99%

“…The detailed process on how to establish the optimal length can refer to [31,32]. In most cases, the most widely used model GARCH(1, 1) can satisfy the requirement of conditional variance modeling for the detection series [30] because they have a nonzero conditional mean offset and exhibit volatility clustering.…”

Section: Determination Of Detection Thresholdmentioning

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

Cited by 33 publications

References 18 publications

A Strategy to Mitigate the Ionospheric Scintillation Effects on BDS Precise Point Positioning: Cycle-Slip Threshold Model

A Strategy to Mitigate the Ionospheric Scintillation Effects on BDS Precise Point Positioning: Cycle-Slip Threshold Model

GPS/BDS triple-frequency cycle slip detection and repair algorithm based on adaptive detection threshold and FNN-derived ionospheric delay compensation

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

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