Multiple Cycle Slip Detection Algorithm for a Single Frequency Receiver

Yoon, Yong Tae; Lee, Byung-Seok; Heo, Moon Beom

doi:10.3390/s22072525

Cited by 5 publications

(5 citation statements)

References 20 publications

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In case the absolute difference between the predicted and the receiver data-derived triple differences is greater than a predefined threshold ( 21 ), a cycle slip is reported in the algorithm. In this study, the threshold is set to half a cycle as a constant, which is a commonly used value [ 9 , 24 ]. Using the error propagation and the EKF covariance matrix, it is possible to estimate the uncertainty of the predicted triple differenced carrier-phase measurements.…”

Section: Cycle Slip Detection Techniques For Moving Platformsmentioning

confidence: 99%

See 1 more Smart Citation

Position and Attitude Determination in Urban Canyon with Tightly Coupled Sensor Fusion and a Prediction-Based GNSS Cycle Slip Detection Using Low-Cost Instruments

Vanek

Farkas

Rózsa

2023

Sensors

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We present a position and attitude estimation algorithm of moving platforms based on the tightly coupled sensor fusion of low-cost multi baseline GNSS, inertial, magnetic and barometric observations obtained by low-cost sensors and affordable dual-frequency GNSS receivers. The sensor fusion algorithm is realized by an Extended Kalman Filter and estimates the states including GNSS receiver inter-channel biases, integer ambiguities and non-GNSS receiver biases. Tightly coupled sensor fusion increases the reliability of the position and attitude solution in challenging environments such as urban canyons by utilizing the inertial observations in case of GNSS outage. Moreover, GNSS observations can be efficiently used to mitigate IMU sensor drifts. Standard GNSS cycle slips detection methods, such as the application of triple differences or linear combinations such as Melbourne–Wübbena combination and the phase ionospheric residual extended TurboEdit method. However, these techniques are not well suited for the localization in quickly changing environments such as urban canyons. We present a new method of tightly coupled sensor fusion supported by a prediction based cycle slip detection technique, applied to a GNSS setup using three antennas leading to multiple moving baselines on the platform. Thus, not only the GNSS signal properties but also the dynamics of the moving platform are considered in the cycle slip detection. The developed algorithm is tested in an open-sky validation measurement and two sets of measurement in an urban canyon area. The sensor fusion algorithm processes the data sets using the proposed prediction-based cycle slip method, the loss-of-lock indicator-based, and for comparison, the Melbourne–Wübbena and the TurboEdit cycle slip detection methods are also included. The obtained position and attitude estimation results are compared to the internal solution of raw data source GNSS receivers and to the observations of a high-accuracy GNSS/INS unit including a fiber optic gyro. The validation test confirms the proper cycle slip detection in an ideal environment. The more challenging urban canyon test results show the reliability and the accuracy of the proposed method. In the case of the second urban canyon test, the proposed method improved the integer ambiguity resolution success rate by 19% and these results show the lowest horizontal and vertical coordinate distortion in comparison of the linear combination and the loss-of-lock-based cycle slip methods.

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Section: Cycle Slip Detection Techniques For Moving Platformsmentioning

confidence: 99%

“…Yoon et. al developed a cross-ratio detection methodology, which uses sequentially differentiated double differential carrier-phase measurements and moving averaged Doppler data [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Position and Attitude Determination in Urban Canyon with Tightly Coupled Sensor Fusion and a Prediction-Based GNSS Cycle Slip Detection Using Low-Cost Instruments

Vanek

Farkas

Rózsa

2023

Sensors

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“…With the rapid development of multi-frequency satellites, there are now more combined models of multi-frequency in GNSS positioning, providing greater opportunities for cycle slip detection and repair 4 , 5 . However, current research on cycle slip detection and repair primarily focuses on single-frequency, dual-frequency, and triple-frequency systems 6 , with limited discussion on five-frequency systems 7 .…”

Section: Introductionmentioning

confidence: 99%

GPS/BDS triple-frequency cycle slip detection and repair based on moving window global search method

Wang,

Huang

2024

Sci Rep

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Cycle slip detection and repair are crucial steps in achieving high accuracy in Global Navigation Satellite System (GNSS) data processing. The use of Global Positioning System (GPS) and BeiDou Navigation Satellite System (BDS) triple frequency observations allows for more accurate detection and repair of cycle slips compared to single or dual frequency. This study presents a moving window global search method by selecting three sets of combined coefficients to construct geometry-free (GF) models to minimize the influence of the ionosphere, using a moving window to update the standard deviation of cycle slip estimation, applying the "3 $$\upsigma$$ σ " criterion to constrain the range, and utilizing a global search method to detect and repair triple-frequency cycle slips. Through five sets of 1 Hz GNSS data experiments, the results demonstrate the effectiveness of this method in determining the position and size of triple-frequency cycle slips while avoiding multi-value problems. The detection success rate for GPS ranges from 98.0 to 100.0%, while BDS ranges from 92.0 to 100.0%. On average, GPS achieves a detection rate of 99.2%, and BDS reaches 96.7%, which is 0.8% and 1.8% higher than the direct rounding method, respectively. Compared to existing methods, it is also effective for the vast majority of small cycle slips within 2 cycles.

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“…To implement a carrier phase-based positioning, an integer ambiguity must be resolved, and its continuity should be reliably monitored. If a discontinuity of the carrier phase called a cycle slip occurs, a new integer ambiguity of the carrier phase should be found [5,6], or a cycle slip should be repaired [7,8].…”

Section: Introductionmentioning

confidence: 99%