Development and assessment of GPS virtual reference stations for RTK positioning

Hu, G.; Khoo, Hwa Seng; Goh, Pong Chai; Law, Choi Look

doi:10.1007/s00190-003-0327-4

Cited by 97 publications

(77 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In the equatorial region, there are severe ionospheric activities that result in difficulty for the network ambiguity resolution process (Hu et al, 2003), especially if inter-station distances are over 40 -50 km (Cannon et al, 2001;Willgalis et al, 2001). It is because ionospheric errors are less spatially correlated over long baselines.…”

Section: Network Geometrymentioning

confidence: 99%

A Review on Legal Traceability of GNSS Measurements in the Malaysian Cadastral Practice

Gill

Shariff

Omar

et al. 2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

ABSTRACT:As the dependency on Global Navigation Satellite System (GNSS) in surveying has been growing over the years, the need for legal traceability of GNSS measurements has become a significant matter. In Malaysia, with the advent of the Malaysia Real-time Kinematic Network (MyRTKnet), GNSS surveying has revolutionised land survey and mapping. Correspondingly, the Department of Survey and Mapping Malaysia (DSMM) amended and published standard regulations and guidelines concerning cadastral survey, i.e., Cadastral Survey Regulations 2009, to include GNSS measurements. However, these regulations and guidelines has not comprehensively incorporated legal traceability of GNSS measurements; which is a prerequisite for cadastral surveys as it requires reliable and conclusive evidence for issues such as boundary disputes. The first objective of this paper is to review and discuss the legal traceability of GNSS measurements. Secondly, it will highlight the current practice and issues, i.e., with regard to legal traceability, within the present Malaysian cadastral regulation and guidelines, in relation to the prevalently adopted Network RTK (N-RTK) technique, GNSS instrument calibrations, and reference stations' accuracy. Lastly, a rudimentary best practice guideline for GNSS surveying in cadastral survey for Malaysia is proposed. It is expected that this paper will contribute to the implementation of a best practice guideline, which is inclusive of legal traceability of GNSS measurements, for the Malaysian cadastral practice.

show abstract

Section: Network Geometrymentioning

confidence: 99%

A Review on Legal Traceability of GNSS Measurements in the Malaysian Cadastral Practice

Gill

Shariff

Omar

et al. 2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

show abstract

“…The number of full waves between the receiver and satellite cannot be accounted for at the initial signal acquisition (Xu 2007). The ambiguous number of these waves in carrier phase measurement is resolved by on-the-fly (OTF) techniques in real time (Hu et al 2003). The pseudo-range phase is measured at the base station A at epoch t0 may be represented by the equation given below (Hoffmann et al 2008): (1) is the geometric range, is the satellite-receiver dependent bias, is satellite dependent only, is receiver dependent only.…”

Section: Single Base Rtk Gnssmentioning

confidence: 99%

“…Techniques have been developed to overcome this distance dependence using a network of GNSS reference stations spread over a wide geographic area (Hu et al 2003;Rizos and Han 2003).…”

Section: Network Rtkmentioning

confidence: 99%

“…The VRS technique is currently the most popular and efficient method of transmitting corrections through a data link to the network users for RTK positioning (Hu et al, 2003). The basic theory of the VRS method is to transform measurements made at real reference stations to the location of the VRS and, therefore, to a different location at the same epoch.…”

Section: Network Rtkmentioning

confidence: 99%

See 1 more Smart Citation

Performance of Single Base RTK GNSS Method versus Network RTK

Aykut¹,

Gülal²,

Akpınar³

2015

Earth sci. res. j.

View full text Add to dashboard Cite

is examined by use of measurements in 5 Istanbul GPS Triangulation Network (IGNA) benchmark points, with five repeatability measurements up to 50 km from the station. The CORS-TR network RTK solution is used at the same points, and the results are compared. The measured coordinates produced by the two RTK solutions are compared with the IGNA point coordinates. Satellite geometry, initialisation time and the standard deviation of repeatability are also determined. The differences between measured and known coordinates are calculated as 1-2 cm horizontally and close to 3 cm vertically using the YLDZ single base RTK method.Después de la década de los 90, el Sistema Global de Navegación por satélite/Sistema de Posicionamiento Global (GNSS/GPS, en inglés), basado en tecnología de Navegación Cinética Satelital en Tiempo Real (RTK, del inglés Real Time Kinematic) se convirtió en la técnica preferida en el mundo y que todavía se utiliza en varias aplicaciones como el monitoreo, sistemas de alerta temprana y mapeo e ingeniería de aplicativos. Para finales de 2008, los aplicativos de ingeniería utilizan la red de Estaciones de Referencia de Funcionamiento Continuo (CORS-TR, un proyecto establecido en Turquía) para determinar posiciones en tres dimensiones a lo largo del territorio turco. Por otro lado, las estaciones RTK de una sola base han funcionado en Turquía. La YLDZ es una estación de este tipo que fue establecida en la Universidad Técnica de Yildiz por el departamento de Ingeniería Geomática en 2012. En este trabajo se examina el desempeño de la estación YLDZ a través de la medición de cinco puntos de referencia del Sistema de Triangulación GPS de Estambul (IGNA, en inglés) con cinco mediciones repetitivas a más de 50 km de la estación. Similares medidas RTK se hicieron con la red CORS-TR y se compararon los resultados. Las dos mediciones producidas por las soluciones RTK se compararon con los puntos de coordenadas IGNA. También se determinó la geometría satelital, el tiempo de inicialización y la desviación estándar de la repetibilidad. Las diferencias entre las coordenadas medidas y las coordenadas conocidas se calcularon en un rango de 1-2 centímetros horizontalmente y cerca de 3 centímetros verticalmente para la estación YLDZ con el método RTK. ABSTRACT RESUMEN

show abstract

“…On the other hand, virtual sensor, also known as soft sensor, smart sensor or estimators, estimates properties or conditions of environment using mathematical models rather than physical sensors, are used in place of the real sensors (Wilson, 1997). The concept of virtual sensor or virtual sensor network has widely introduced many research areas such as computer science (Hardy and Maroof,19 99), microphone arrangement (Elliot and David, 1992), global positioning (Hu et al, 2003), traffic management (Dailey and Cathey, 2006), remote sensing-based air quality estimating (Ung et al, 2009;Moussafir et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Integration of CFD-Based Virtual Sensors to A Ubiquitous Sensor Network to Support Micro-Scale Air Quality Management

Woo¹,

An²,

Hong³

et al. 2016

J ENVIRON INFORM

View full text Add to dashboard Cite

ABSTRACT. As a city is urbanized, its landscape becomes more complex owing to the construction of high-rise buildings. The small scale wind-field in an urban district may change frequently owing to the complex terrain, the diverse land use, and high-rise buildings. It also leads to dynamic changes in the air pollution in that area. Conventional urban-scale air quality management systems, however, are unable to effectively manage detailed aspects of such changes. In this study, we set up a micro-scale air quality management system (MAMS) testbed over Konkuk University, Seoul, Korea. A wireless sensor network and a CFD modeling data management system were combined to support the MAMS sensor service. The sensor-based monitoring system showed reasonably good performance for temperature, humidity, and carbon dioxide from inter-comparison studies against conventional large format analyzers. However, the real-world application of a sensor network for air quality monitoring has many limitations, such as limited installation points for 3-dimentional monitoring, limited power availability for continuous monitoring, and limited sensitivity to ambient concentrations. We therefore developed the concept of a "virtual sensor" to provide micro-scale personal air pollution information services, using a CFDbased air quality modeling system. Based on the information provided by the virtual sensors, we developed a futuristic air quality service of the MAMS application for the mobile platform. We found that the combination of CFD-based modeling data with a fast large volume data management system and a mobile visualization system will be a successful intermediate solution for a user-based air quality service before an actual ubiquitous sensor-based system is available to produce micro-scale environmental information for entire urban areas.

show abstract

Development and assessment of GPS virtual reference stations for RTK positioning

Cited by 97 publications

References 13 publications

A Review on Legal Traceability of GNSS Measurements in the Malaysian Cadastral Practice

A Review on Legal Traceability of GNSS Measurements in the Malaysian Cadastral Practice

Performance of Single Base RTK GNSS Method versus Network RTK

Integration of CFD-Based Virtual Sensors to A Ubiquitous Sensor Network to Support Micro-Scale Air Quality Management

Contact Info

Product

Resources

About