Cycle slip detection and repair of undifferenced single-frequency GPS carrier phase observations

Zangeneh-Nejad, Farzad; Amiri-Simkooei, A. R.; Sharifi, Mohammad Ali; Asgari, J.

doi:10.1007/s10291-017-0633-6

Cited by 40 publications

(29 citation statements)

References 24 publications

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“…Amiri-Simkooei et al 2018and Zangeneh-Nejad et al (2017). However, as this is suspect to introducing unwanted depth variations, this approach is more suitable for morphological studies (where focus is on specific bathymetric features) and not for charting purposes (where the safe navigation is of importance) as considered in this contribution.…”

Section: H Mohammadloo February 4 2019mentioning

confidence: 99%

Using Alternatives to Determine the Shallowest Depth for Bathymetric Charting: Case Study

et al. 2019

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Methods for gridding MBES measurements to equidistant grids are proposed as alternative to the shallowest measured depth which is affected by outliers. The approaches considered are to use a combination of mean and standard deviation of soundings, and the regression coefficient from the best fitted plane. These methods along with mean and shallowest depths are applied to two surveyed areas. Two issues are found to be of importance, i.e., a proper distribution of 1 H. Mohammadloo, February 4, 2019 soundings and low uncertainties in the depth measurements. Improper sampling excludes using the method employing regression coefficients. For flat areas the shallowest measured depth is found to be highly influenced by measurement uncertainties, counteracted when using the mean depth. However, the mean depth underestimates the shallowest depth for areas with slopes. When correcting the mean depth for standard deviation, the effect of slopes is accounted for while the influence of measurement uncertainties is decreased compared to shallowest measured depth. Since the uncertainties are dependent on beam angle, depth and measurement equipment, these issues need to be accounted for in the survey planning.

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Section: H Mohammadloo February 4 2019mentioning

confidence: 99%

Using Alternatives to Determine the Shallowest Depth for Bathymetric Charting: Case Study

et al. 2019

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“…For single-frequency receivers, statistical testing during LS adjustment was used for CS detection in references [22,[26][27][28][29][30][31]. All the implemented schemes were able to detect CS for an MDB of one cycle [9].…”

Section: Introductionmentioning

confidence: 99%

A Cycle Slip Detection Framework for Reliable Single Frequency RTK Positioning

Farooq

Yang

Ada

2020

Sensors

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Single frequency real-time kinematic (RTK) positioning is expected to be the leading implementation platform for a variety of emerging GNSS mass-market applications. During RTK positioning, the most common source of measurement errors is carrier-phase cycle slips (CS). The presence of CS in carrier-phase measurements is tested by a CS detection technique and correspondingly taken care of. While using CS prone measurement data, positioning reliability is an area of concern for RTK users. Reliability can be linked with the CS detection scheme through a least squares (LS) adjustment process. This paper proposes a CS detection framework for reliable RTK positioning using single-frequency GNSS receivers. The scheme uses double differenced measurements for CS detection via LS adjustment using a detection, identification, and adaptation approach. For reliable positioning, the procedure to link the detection and identification stages is described. Through tests conducted on kinematic data, internal and external reliability are theoretically determined by calculating minimal detectable bias (MDB) and marginally detectable errors, respectively. After introducing CS, the actual values of MDB are found to be four cycles, which are higher than the theoretically obtained values of one and two cycles. Although CS detection for reliable positioning is implemented for single-frequency RTK users, the proposed procedure is generic and can be used whenever CS are detected through statistical tests during LS adjustment.

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“…Such a cycle slip breaks the continuity of the integer cycle counting in a continuous carrier tracking arc. Since one cycle of slip will cause about two decimeters of ranging error, and the size of that can change from one to millions of cycles, it significantly affects the precision and reliability of high-precision navigation and positioning (Kim et al, 2015;Zangeneh-Nejad et al, 2017). As a result, cycle slip detection and repair must be correctly dealt with before GNSS data processing.…”

Section: Introductionmentioning

confidence: 99%

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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Cycle slip detection and repair of undifferenced single-frequency GPS carrier phase observations

Cited by 40 publications

References 24 publications

Using Alternatives to Determine the Shallowest Depth for Bathymetric Charting: Case Study

Using Alternatives to Determine the Shallowest Depth for Bathymetric Charting: Case Study

A Cycle Slip Detection Framework for Reliable Single Frequency RTK Positioning

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

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