Precise positioning with the GPS

Goad, Clyde C.

doi:10.1007/bfb0010108

Cited by 15 publications

(13 citation statements)

References 3 publications

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“…Cycle slip detection using dual-frequency GNSS observations has been investigated for many years, and various algorithms have been proposed since the 1980s. Examples are phase ionospheric residual method (Goad 1985), the TurboEdit algorithm (Blewitt 1990), high-order time difference method (Kleusberg et al 1993), and Bayesian approach (de Lacy et al 2008). A reliable cycle slip detection method with both high sensitivity and low false-alarm rate is always desirable, but unfortunately, it is hard to realize in practice.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…Various methods are used in the literature to determine the testing quantity (Lichtenegger and Hofmann-Wellenhof, 1989). In this study, a special L 1 and L 2 combination known as ionospheric residuals was used (Goad, 1986).…”

Section: P R O C E S S I N G C O L L E C T E D D a T Amentioning

confidence: 99%

“…In this approach, Kalman filtering was used to predict subsequent observation values (Equation 13) that were then compared with the observed ones to detect cycle slips. In this study, the discrete Kalman filter with the following formulas was used (Goad, 1986 ;Bastos and Landau, 1988;Collin and Warnant, 1995) ; System and measurement models ;…”

Section: P R O C E S S I N G C O L L E C T E D D a T Amentioning

confidence: 99%

Sub-Metre Accuracy for Stand Alone GPS Positioning in Hydrographic Surveying

et al. 2004

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The accuracy that can be achieved by a single GPS receiver in stand-alone mode is around 10 metres with SA switched off; this is not adequate for most hydrographic studies. This study aims to improve this level of accuracy using a single geodetic receiver in stand-alone mode by applying a phase smoothing algorithm. The algorithm described in this study requires that the measurements be started from a known point for initialisation. The test site selected for the study is Halic bay, Istanbul. After GPS data were collected on a geodetic point for initialisation, the receiver was moved to a hydrographic vessel and trial measurements were performed along several survey profiles. The position of the vessel was calculated at every epoch using the carrier phase smoothing algorithm. In order to analyse the accuracy of the results, a second receiver collected data on another known point on the seashore during the whole session. The position of the vessel was accurately determined using a kinematic positioning method considering the data collected by both receivers. The results produced show that an accuracy of less than a metre can be achieved using the approach considered in this study. K E Y W O R D S1. GPS. 2. Phase Smoothing. 3. Hydrography. I N T R O D U C T I O N.The positioning accuracy requirements in marine and hydrographic applications are varied. In marine applications, 50-100 metre accuracy might be sufficient for oceanographic and general navigation purposes whereas an accuracy of several metres is essential for ships approaching harbour. On the other hand, hydrographic applications are usually categorized with respect to the accuracy requirements as low, medium and high. Whilst the first one requires t100 m positional accuracy, the second requires t1 to 10 m positional accuracy. The highest accuracy required is t0 . 1 m in position and height (Seeber, 1993). GPS techniques can be used in a wide range of marine survey applications for a variety of reasons, mainly due to being independent of weather conditions, having no requirement for the inter-visibility of survey points and being able to conduct surveying during night and day, and providing accurate and reliable results. Positioning

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“…20 Surface network In order to achieve the absolute tolerance and the circumference requirements, a surface network with pillar-type monuments (Fig. 26) must usually be established.…”

Section: Survey Networkmentioning

confidence: 99%

Magnet Support and Alignment

Rüland¹

1995

Synchrotron Radiation Sources — A Primer

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Precise positioning with the GPS

Cited by 15 publications

References 3 publications

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

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

Sub-Metre Accuracy for Stand Alone GPS Positioning in Hydrographic Surveying

Magnet Support and Alignment

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