First results of using the second generation SBAS in Australian urban and suburban road environments

El‐Mowafy, Ahmed; Cheung, Norman; Rubinov, Eldar

doi:10.1080/14498596.2019.1664943

Cited by 11 publications

(5 citation statements)

References 12 publications

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“…In addition to the commercial services, high-precision GNSS products are nowadays also directly broadcast by navigation satellites from the Japanese Quasi-Zenith Satellite System (QZSS) within, e.g., the Multi-GNSS Advanced Demonstration of Orbit and Clock Analysis (MADOCA) service and the centimeter level augmentation service (CLAS) [ 30 ]. Another example is the new generation of the satellite-based augmentation system (SBAS) initiated by Australia and New Zealand, which broadcasted high-precision PPP corrections via L1 and L5 to the GPS and GPS/Galileo users, respectively, within the test bed [ 31 , 32 ]. Although the current service areas of the QZSS- and the SBAS-based PPP corrections are still limited to the Asia-Pacific region, with the increase in the number of new-generation SBAS services (expected for the Wide Area Augmentation System (WAAS) and the European Geostationary Navigation Overlay Service (EGNOS), etc.…”

Section: Processing Proceduresmentioning

confidence: 99%

Proposed Orbital Products for Positioning Using Mega-Constellation LEO Satellites

Wang

El‐Mowafy

2020

Sensors

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With thousands of low Earth orbit (LEO) satellites to be launched in the near future, LEO mega-constellations are supposed to significantly change the positioning and navigation service for ground users. The goal of this contribution is to suggest and discuss the feasibility of possible procedures to generate the LEO orbital products at two accuracy levels to facilitate different positioning methods—i.e., Level A orbits with meter-level accuracy as LEO-specific broadcast ephemeris, and Level B orbits with an accuracy of centimeters as polynomial corrections based on Level A orbits. Real data of the LEO satellite GRACE FO-1 are used for analyzing the error budgets. For the Level A products, compared to the orbital user range errors (OUREs) of a few centimeters introduced by the ephemeris fitting, it was found that the orbital prediction errors play the dominant role in the total error budget—i.e., at around 0.1, 0.2 and 1 m for prediction intervals of 1, 2 and 6 h, respectively. For the Level B products, the predicted orbits within a short period of up to 60 s have an OURE of a few centimeters, while the polynomial fitting OUREs can be reduced by a few millimeters when increasing the polynomial degree from one to two.

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Section: Processing Proceduresmentioning

confidence: 99%

Proposed Orbital Products for Positioning Using Mega-Constellation LEO Satellites

Wang

El‐Mowafy

2020

Sensors

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“…[9]). Moreover, specification of requirements to suit emerging user applications is becoming increasingly present in research [10,11,12,13,14]. However, to date there has not been work done to investigate how both traditional and emerging GNSS user sectors understand and perceive the FAIRness of provided precise positioning data and metadata.…”

Section: Introductionmentioning

confidence: 99%

FAIR data and metadata: GNSS precise positioning user perspective

Ivánová

Keenan²,

Marshall³

et al. 2023

Data Intelligence

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The FAIR principles of Wilkinson et al. [1] are finding their way from research into application domains, one of which is the precise positioning with global satellite navigation systems (GNSS). Current GNSS users demand that data and services are findable online, accessible via open protocols (by both, machines and humans), interoperable with their legacy systems and reusable in various settings. Comprehensive metadata are essential in seamless communication between GNSS data and service providers and their users, and, for decades, geodetic and geospatial standards are efficiently implemented to support this. However, GNSS user community is transforming from precise positioning by highly specialised use by geodetic professionals to every-day precise positioning by autonomous vehicles or wellness obsessed citizens. Moreover, rapid technological developments allow alternative ways of offering data and services to their users. These transforming circumstances warrant a review whether metadata defined in generic geospatial and geodetic standards in use still support FAIR use of modern GNSS data and services across its novel user spectrum. This paper reports the results of current GNSS users' requirements in various application sectors on the way data, metadata and services are provided. We engaged with GNSS stakeholders to validate our findings and to gain understanding on their perception of the FAIR principles. Our results confirm that offering FAIR GNSS data and services is fundamental, but for a confident use of these, there is a need to review the way metadata are offered to the community. Defining standard compliant GNSS community metadata profile and providing relevant metadata with data on-demand, the approach outlined in this paper, is a way to manage current GNSS users' expectations and the way to improve FAIR GNSS data and service delivery for both humans and the machines.

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“…Li et al (2016) presents an improved Single Frequency (SF) PPP approach based on EGNOS and shows that the SBAS PPP accuracy can reach a decimeter level. And El-Mowafy et al (2020) conducted Dual-Frequency (DF) SBAS-based PPP for the second-generation Australia-New Zealand SBAS services.…”

Section: Introductionmentioning

confidence: 99%

Models and performance of SBAS and PPP of BDS

Chen

Zhang

et al. 2022

Satell Navig

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Satellite Based Augmentation System (SBAS) is one of the services provided by the BeiDou Navigation Satellite System (BDS). It broadcasts four types of differential corrections to improve user application performance. These corrections include the State Space Representation (SSR) based satellite orbit/clock corrections and ionospheric grid corrections, and the Observation Space Representation (OSR) based partition comprehensive corrections. The algorithms generating these SBAS corrections are not introduced in previous researches, and the user SBAS positioning performance with the contribution of BDS-3 has not been evaluated. In this paper, we present the BDS SBAS algorithms for these differential corrections in detail. Four types of Precise Point Positioning (PPP) function models for BDS Dual-Frequency (DF) and Single-Frequency (SF) users using the OSR and SSR parameters are also proposed. One week of data in 2020 is collected at 20 reference stations including the observations of both BeiDou-2 Navigation Satellite System (BDS-2) and BeiDou-3 Navigation Satellite System (BDS-3) satellites, and the PPP under various scenarios are performed using all the datasets and the BDS SBAS broadcast corrections. The results show that the performance of BDS-2/BDS-3 combination is superior to that of BDS-2 only constellation. The positioning errors in Root Mean Square (RMS) for the static DF PPP are better than 8 cm/15 cm in horizontal/vertical directions, while for the static SF PPP are 11 cm/24 cm. In the scenarios of simulated kinematic PPP, three Dimension (3D) positioning errors can reach 0.5 m in less than 10 min for the DF PPP and 30 min for the SF PPP, and the RMSs of the DF and SF PPP are better than 17 cm/21 cm and 20 cm/32 cm in horizontal/vertical directions. In a real-time single- and dual-frequency kinematic positioning test, the positioning errors of all three components can reach 0.5 m within 30 min, and the positioning accuracy after solution convergence in the N, E and U directions is better than 0.3 m.

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First results of using the second generation SBAS in Australian urban and suburban road environments

Cited by 11 publications

References 12 publications

Proposed Orbital Products for Positioning Using Mega-Constellation LEO Satellites

Proposed Orbital Products for Positioning Using Mega-Constellation LEO Satellites

FAIR data and metadata: GNSS precise positioning user perspective

Models and performance of SBAS and PPP of BDS

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