Evaluating the Effect of Global Positioning System (GPS) Satellite Clock Error via GPS Simulation

Sathyamoorthy, Dinesh; Shafii, Shalini; Amin, Zainal Fitry M; Jusoh, Asmariah; Ali, Siti Zainun

doi:10.1088/1755-1315/37/1/012013

Cited by 7 publications

(7 citation statements)

References 3 publications

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“…Along the three orthogonal directions, the decomposition of the ephemeris error is carried out. Root sum square value of the clock error and line of sight of ephemeris error contributes to the range error of errors in clock and ephemeris [22], [28], [29].…”

Section: Control System Errormentioning

confidence: 99%

Study of positioning estimation with user position affected by outlier: a case study of moving-horizon estimation filter

et al. 2022

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Many applications which require accurate location point positioning systems utilize global position system for pseudosciences. One of the main challenges faced by the system occurs due to the inherent errors that are a resultant of outliers. This considerably reduces the accuracy of the observations of global position system device. In this paper, we briefly introduce the problem of position estimation when the pseudo range measurements have an outlier. Moving horizon estimation algorithm has been adapted for the simulation result compared with the extended Kalman filter model, which is still imperfect for the case of outlier. The point at which a pseudo range becomes an outlier is considered at a fixed time instance. A simulation example is presented using an existing model with a moving horizon estimator and an extended Kalman filter. The moving horizon filter turns to be more robust than Kalman filtering with presence of outlier under certain choice of tunning parameter.

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Section: Control System Errormentioning

confidence: 99%

Study of positioning estimation with user position affected by outlier: a case study of moving-horizon estimation filter

et al. 2022

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“…The satellite data for satellite clock offsets and orbits are given in a broadcast message that is taken by the GNSS receivers. The satellite clock offsets have errors (10 ns) [23,24]. However, the effect of satellite clock errors is equal to the rover, which is also the case for the reference station.…”

Section: Signal Obstructions and Multipathmentioning

confidence: 99%

“…For a single reference station that has a baseline length "r," a satellite orbit error "e 0 " at an R distance to the satellites yields an error in the estimated position, ep, of approximately: ep = e 0 * r/R, which might be derived from the Taylor expansion. For broadcast orbits employed in RTK, it may be accepted that the orbit error is 2 m) [23,24]. If the distance between the reference and the rover is r = 50 − 100 km and R = 20 000 km, we have 5-10 mm errors because of satellite orbits.…”

Section: Signal Obstructions and Multipathmentioning

confidence: 99%

Examining the Accuracy of Network RTK and Long Base RTK Methods with Repetitive Measurements

et al. 2019

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Real-time kinematic (RTK) technique is important for mapping applications requiring short measure time, the distance between rover and base station, and high accuracy. There are several RTK methods used today such as the traditional RTK, long base RTK (LBRTK), network RTK (NRTK), and precise point positioning RTK (PPP-RTK). NRTK and LBRTK are popular with the advantage of the distance, the time, and accuracy. In the present study, the NRTK and LBRTK measurements were compared in terms of accuracy and distance in a test network with 6 sites that was established between 5 and 60 km. Repetitive NRTK and LBRTK measurements were performed on 6 different days in 2015-2017-2018 and additionally 4 campaigns of repetitive static measurements were carried out in this test network. The results of NRTK and LBRTK methods were examined and compared with all relevant aspects by considering the results of the static measurements as real coordinates. The study results showed that the LBRTK and NRTK methods yielded similar results at base lengths up to 40 km with the differences less than 3 cm horizontally and 4 cm vertically.

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“…In view of the above limitations, the need to develop a calibration methodology is evident, for vehicle speed measurement GNSS-based instrumentation, to be able to use calibration standards that can grant measurement traceability covered by the CIPM MRA. Some proposal to calibrate or to test the speed measured by GNSS receivers have been made in References [23][24][25][26][27][28], but the determination of a calibration method to be able to grant the desired CMC in a wide speed range, considering all the measurement uncertainties contribution is still missing.…”

Section: Introductionmentioning

confidence: 99%

“…The aim of this work is to analyze the suitability of an experimental calibration method for GNSS speed measurement systems. Among all the solutions presented in References [23][24][25][26][27][28], in this paper, the attention is focused on the calibration methodology presented in References [23,24] and is based on the use of two pairs of photocells on a track together with a frequency counter and a synchronization system. Considering all the measurement uncertainty contribution, a sensitive analysis has been made in order to understand the limits and/or the applicability of this calibration methodology in a speed range from 1 to 300 km/h.…”

Section: Introductionmentioning

confidence: 99%

On the Calibration of GNSS-Based Vehicle Speed Meters

Martucci

Cerasuolo

Petrella

et al. 2020

Sensors

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Thanks to their metrological characteristics (accuracy, dimensions, synchronization capability, easy interfacing, and so on), in the last few years, the GNSS (Global Navigation Satellite System) based speed instruments are often used in a wide field of application. The traceability of the measurement results achieved by the GNSS instrument should be made by means of calibration procedures in compliance with the ISO/IEC 17025 standard and ILAC (International Laboratory Accreditation Cooperation) policy on the traceability of measurement results. In this context, some calibration methodologies have been proposed in the literature or used by some calibration centers. In a speed range from 1 to 300 km/h, an analysis on the suitability of the experimental calibration method (based on a couple of photocells placed on the road at a certain distance) for the GNSS speed measurement systems is presented in this paper. An analysis of the measurement setup has allowed for the recognition of both all the uncertainty contributions and defines the variability range of their values. After the formulation of the relationships between the uncertainty contributions and the total calibration uncertainty due to the calibration method, the sensitivity analysis has been made. The analyzed measurement setup, even if considering a careful choice of both instrumentations and methodologies, is suitable for the calibration of high accuracy GNSS based instruments only considering distances between the photocells sufficiently large and for speed values lower than 200 km/h. In any case, the proposed analysis can be a useful tool to allow for the choices on the measurement setup to reach the desired trade-off between calibration costs and compliance with technical requirements and also the calibration of instrumentation different by GNSS.

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Evaluating the Effect of Global Positioning System (GPS) Satellite Clock Error via GPS Simulation

Cited by 7 publications

References 3 publications

Study of positioning estimation with user position affected by outlier: a case study of moving-horizon estimation filter

Study of positioning estimation with user position affected by outlier: a case study of moving-horizon estimation filter

Examining the Accuracy of Network RTK and Long Base RTK Methods with Repetitive Measurements

On the Calibration of GNSS-Based Vehicle Speed Meters

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