Achievable Positioning Accuracies in a Network of GNSS Reference Stations

Manzino, Ambrogio; Dabove, Paolo; Agostino, Mattia De

doi:10.5772/28666

Cited by 10 publications

(8 citation statements)

References 5 publications

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“…According to these results, the greatest difference between the measurements taken using the static observation and VRS technique was −0.041 m at Easting, +0.048 m at Northing, and −0.088 m at the ellipsoid elevation. In terms of some of the evaluations on networks operating on the NRTK principle, according to reference [30] it is stated that in a network where the distances between stations are less than 50 km, the best performance can be obtained with 2 cm planimetric error and 3 cm elevation. It is stated that these errors may reach up to 4-10 cm planimetrically and 8-15 cm at elevation in medium-size or larger reference lengths.…”

Section: Resultsmentioning

confidence: 99%

A Comparison of the Accuracy of VRS and Static GPS Measurement Results for Production of Topographic Map and Spatial Data: A Case Study on CORS-TR

Tuşat

2018

Teh. vjesn.

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Abstract:The on-going developments in Global Navigation Satellite Systems (GNSS) technology affect techniques in geographic information and associated documents. The national Continuously Operating Reference Station (CORS) networks, which operate on the Real Time Kinematic (RTK) principle, are multi-purpose geodetic networks and offer services to a large portion of society including all the public institutions and other organizations, military and civilian users and to scientific researchers. It is possible to utilize these networks both in real time positioning applications using the Network Real Time Kinematic (NRTK) method and in static applications using the Receiver Independent EXchange (RINEX) format data from reference stations. In this study, Virtual Reference Station (VRS) and static GNSS measurements were undertaken based on a Continuously Operating Reference Station-Turkey (CORS-TR) network in a test network established in Turkey. As a result of the measurements, repeatability attained using the VRS method was examined. Moreover, the coordinates obtained from VRS measurements based on CORS-TR network were compared with the coordinates calculated as a result of static observations. From the accuracies and repeatability, an investigation was implemented to determine the extent to which NRTK applications in real-time GNSS networks can be used to produce spatial data and create topographic maps.

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Section: Resultsmentioning

confidence: 99%

A Comparison of the Accuracy of VRS and Static GPS Measurement Results for Production of Topographic Map and Spatial Data: A Case Study on CORS-TR

Tuşat

2018

Teh. vjesn.

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“…Overall, 35 points were measured: 24 lie on the ground level, while 11 are located on flat roofs. The precision of the measured coordinates is about 2 cm for the planimetry and about 5 cm for the altimetry [16].…”

Section: Methodsmentioning

confidence: 99%

Metric Accuracy of Digital Elevation Models from WorldView-3 Stereo-Pairs in Urban Areas

2019

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WorldView-3 satellite is providing images with an unprecedented combination of high spatial and spectral resolution. The stereo capabilities and the very high resolution of the panchromatic band (0.31 m) have been fostering new applications in urban areas, where the complexity of the morphology requires a higher level of detail. The present technical note aims to test the accuracy of digital elevation models that can be obtained by WorldView-3 stereo-pairs in these particular contexts, with an operational state-of-the-art algorithm. Validation is performed using check points and existing models of the area (from LiDAR data and oblique aerial images). The experiments, conducted over the city of Bologna (Italy) with six images, proved that roof surfaces and open spaces can be reconstructed with an average error of 1–2 pixels, but severe discrepancies frequently occur in narrow roads and urban canyons (up to several metres in average). The level of completeness achievable with only one pair is extremely variable (ranging from 50% to 90%), due to the combined effect of the geometry of acquisition and the specific urban texture. Better results can be obtained by using more than one pair. Furthermore, smaller convergence angles can be beneficial for the reconstruction of specific urban structures, such as soaring towers.

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“…TABLE I. RECEIVERS CONSIDERED III. NETWORK REAL-TIME KINEMATIC POSITIONING As described in [2], a network of permanent stations for real-time positioning is an infrastructure consisting of three parts: the first one is composed by all the permanent stations in a certain area (more or less extended), which position is wellknown, that transmit their raw data to a control center in realtime. The second part consists of a control centre which receives and processes the data coming from all stations in real-time: this control centre must also fix the ambiguity phase for all satellites of each permanent station and calculate all dispersive biases (ionospheric and tropospheric delays etc.).…”

Section: Receivers and Antennas Usedmentioning

confidence: 99%

“…The task of the network software increases, while it decreases that of the receiver [2]. The rover receiver also must not have special computing power, but it must able to use the differential corrections and to fix the ambiguity phase [6] [8].…”

Section: Receiversmentioning

confidence: 99%

GPS mass-market receivers for precise farming

Dabove

Manzino

2014

2014 IEEE/ION Position, Location and Navigation Symposium - PLANS 2014

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The use of Global Navigation Satellite Systems (GNSS) can help farmers become more efficient, reduce their use of chemicals, and increase crop yields. By increasing the accuracy, availability, reliability and continuity of satellite signals, the use of some augmentations systems (such as WAAS or EGNOS or other private systems) will remove some of the barriers to the adoption of precision agriculture, also not only considering geodetic receivers and complex systems of navigation.The goal of this work is to show how it is possible to consider both mass-market receivers and antennas to obtain centimetrical accuracies, useful for many precise farming applications. As it is possible to find in bibliography, the accuracy of real-time positioning depends mainly on the type of receiver (whether it is single frequency or low-cost) and antenna (whether it is patch, mass-market or geodetic) used. Some different receivers and antennas were tested and some results can be shown, not to analyze what receiver or antenna is the best but in order to analyze the state of the art of these type of instruments. The NRTK experiences have been conducted using mass-market receivers (mainly u-blox) within the Regione Piemonte network of permanent stations. Good results have been obtained: in fact, despite a single frequency instrument is used, the horizontal and verticalcomponents have centimetrical level of accuracy. The maximum 2D error in the case of 'fix' positioning is always less than 5 cm, precision required in many applications of precise farming, such as to individuate livestock positioning and fencing or for crop cultivation (e.g. cereals) and other low-accuracy operations (fertilising and reaping).Practical experiences have demonstrated the value of precise navigation and guidance technologies to increase yield and efficiency of agricolture operations and we want to show it in this paper. Under this condition, mass market sensors could be a valid instruments for a large part of surveying applications related to precise farming.

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Achievable Positioning Accuracies in a Network of GNSS Reference Stations

Cited by 10 publications

References 5 publications

A Comparison of the Accuracy of VRS and Static GPS Measurement Results for Production of Topographic Map and Spatial Data: A Case Study on CORS-TR

A Comparison of the Accuracy of VRS and Static GPS Measurement Results for Production of Topographic Map and Spatial Data: A Case Study on CORS-TR

Metric Accuracy of Digital Elevation Models from WorldView-3 Stereo-Pairs in Urban Areas

GPS mass-market receivers for precise farming

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