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

Qian, Nijia

doi:10.13168/agg.2020.0010

Cited by 4 publications

(1 citation statement)

References 33 publications

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“…The GF combination method performs cycle slip [15] detection by combining carrier phase observations and pseudo-range observations; L GF can be described as:…”

Section: Gf Combination Methodsmentioning

confidence: 99%

A Study on the Detecting Cycle Slips and a Repair Algorithm for B1/B3

et al. 2021

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For the current problem of cycle slips in the observation data of the BDS-2 and BDS-3 (Bei Dou Navigation Satellite System), in this paper, BDS B1I and B3I signals are used as research objects to study the detection of cycle slips, and their repair algorithm. The Geometry-free (GF) and Melbourne–Wübeena (MW) combination algorithm are used for the detection of cycle slips. A new method of arc partition is proposed in this work to detect cycle slips as the boundary to delimit two different observation arcs. In this way, the different values of cycle slips can be divided and marked. Moreover, the gross errors can be removed. Finally, the detection of cycle slips and the analysis of all epochs can be completed and repaired. This work also analyzes the dual-frequency data effect of cycle slips on code multipath observation. The results showed that this method greatly improved the speed of detection of cycle slips.

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“…The GF combination method performs cycle slip [15] detection by combining carrier phase observations and pseudo-range observations; L GF can be described as:…”

Section: Gf Combination Methodsmentioning

confidence: 99%

A Study on the Detecting Cycle Slips and a Repair Algorithm for B1/B3

et al. 2021

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A cycle slip detection and repair method based on generalized-cross-validation regularization for BDS-3 quad/pent-frequency data

Zhao,

Nie,

Chen

et al. 2024

Meas. Sci. Technol.

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Multi-frequency (quad/pent-frequency) observations improve the success rate for BeiDou Navigation Satellite System (BDS-3) cycle slip detection and repair. Three factors are comprehensively considered: the combination of observation wavelength, the amplification factor of ionospheric delay, and the insensitivity, to select the optimal combination coefficients for BDS-3 multi-frequency cycle slip detection. Due to the ill-conditioned equation in multi-frequency cycle slip repair, the Generalized-Cross-Validation (GCV) regularization auxiliary LAMBDA method is proposed. To validate the effectiveness of the proposed detection and repair method under different observation environments, two stations are selected for the test. Using real data, the effectiveness of the selected optimal combination coefficients and the proposed method are tested. The conclusions are as follows: (1) For quad-frequency, one geometry-free and ionosphere-free (GFIF) combination [-1, 2, -4, 3] and three linearly independent geometry-free carrier phase (GF) combinations [-1, 1, 0, 0], [-1, 1, 1, -1], and [-1, 2, -1, 0] are employed to detect cycle slips. For pent-frequency, one GFIF combination [-2, 2, 1, -2, 1] and four linearly independent GF combinations [-1, 1, 0, 0, 0], [0, 0, -1, 1, 0], [0, 0, -1, 0, 1], and [0, -1, 1, 1, -1] are adopted for cycle slip detection. (2) The algorithm proposed in this paper has been demonstrated to achieve a quad/pent-frequency cycle slip detection success rate of 99.99% and 100% in the coastal environment, and both 100% for quad/pent-frequency detection success in the urban environment. (3) The success rate of repair were 99.27% and 99.94% for the coastal stations, and 99.83% and 100% for the urban stations, respectively. The proposed algorithm offers a dependable approach for the identification and rectification of multi-frequency cycle slips, while also providing a point of reference for the future advancement of multi-frequency cycle slip repair techniques.

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Real-time cycle slip detection and repair for BDS-3 triple-frequency and quad-frequency B1C/B1I/B3I/B2a signals

Wang¹

2021

Acta Geodynamica Et Geomaterialia

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This paper presents a real-time cycle slip detection and repair strategy for the BDS-3 triplefrequency and quad-frequency phase observations. For the triple-frequency phase observations, two EWL code-phase combinations and one GF-phase combination are jointly employed to detect and repair cycle slips. Based on the different performances in the success of cycle slip detection and repair, this paper uses GF-phase combinations to detect and repair cycle slip individually. Specifically, the GF-phase combination with a large MTIV value is applied to detect cycle slip possessing the stronger ability to resist ionospheric delay. Besides, the GF-phase combination with a higher success rate of cycle slip repair is selected to repair cycle slip, and the classic LAMBDA method and Ratio test are implemented to fix the cycle slip solution and evaluate reliability separately. For the quad-frequency phase observations, we employ a supernumerary EWL combination based on the triple-frequency, which can directly determine the cycle slip value of the 4 th frequency. The results show that the cycle slip estimation value still can detect and repair all real and artificially added cycle slips even under harsh conditions. Moreover, the overall cycle slip repair success rate is greater than 99.99 %.

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

Cited by 4 publications

References 33 publications

A Study on the Detecting Cycle Slips and a Repair Algorithm for B1/B3

A Study on the Detecting Cycle Slips and a Repair Algorithm for B1/B3

A cycle slip detection and repair method based on generalized-cross-validation regularization for BDS-3 quad/pent-frequency data

Real-time cycle slip detection and repair for BDS-3 triple-frequency and quad-frequency B1C/B1I/B3I/B2a signals

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