Geodetic point positioning with GPS carrier beat phase data from the CASA UNO Experiment

Malys, Stephen; Jensen, Peter Alberg

doi:10.1029/gl017i005p00651

Cited by 158 publications

(42 citation statements)

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“…Uncertainties in a GPS point position may be several meters to several tens of meters, although Malys and Jensen [1990] recently reported point position uncertainties of about 1 m using data from a specially configured global experiment. One source of uncertainty in a GPS point position is the inherent imprecision of the P code group delay measurement, meter level for most receivers, although at least one recent model achieves a several centimeter precision with just several minutes of averaging [Melbourne, 1990].…”

Section: Positioningmentioning

confidence: 99%

An introduction to the global positioning system and some geological applications

Dixon¹

1991

Reviews of Geophysics

212

118

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Receivers equipped to measure dual frequency carrier phase signals from satellites of the Global Positioning System (GPS) have been capable, under special conditions, of determining relative horizontal positions among stations separated by one to a few hundred kilometers with a precision of one to several millimeters since the early 1980s. The major obstacles to making this capability routine, extending it to all parts of the globe, and extending it to longer station separations, have been equipment cost, limitations in the GPS satellite constellation, arduous data analysis, uncertainties in satellite orbits, uncertainties in propagation delays associated with variable tropospheric water vapor, and difficulties in resolving carrier phase cycle ambiguities. Recent improvements have occurred in all these areas. The increasing ease and reduced cost of GPS data acquisition and analysis are having a significant impact on studies of near-fault crustal deformation and earthquake processes, until recently the province of conventional terrestrial geodetic techniques. The enhanced satellite constellation, improved models, and establishment of global tracking networks have extended several millimeters horizontal positioning capability to station separations of 1000 km or more in virtually all parts of the world. This enables study of new classes of tectonic problems that previously were difficult to attack with any geodetic technique. Examples include a complete kinematic description of ongoing crustal deformation in broad, complex continental plate boundary zones, and measurement of relative plate motion at convergent boundaries where global models may be poorly constrained. per day. Additional proof-of-concept satellites followed, culminating 10 years later in the Navigation Technology Satellite (NTS) 2, very similar to subsequent GPS satellites. NTS-2 was launched into a 20,300-km-altitude pages 249-276 Paper number 91RG00152 250 ß Dixon: THE GLOBAL POSITIONING SYSTEM 29, 2/REVIEWS OF GEOPHYSICS orbit, weighed 440 kg, consumed 400 W of power, and transmitted two L band (-1.2 and 1.5 GHz) timing and ranging signals based on a sophisticated cesium clock, with a frequency drift of less than two parts in 10 •3 per day. One year after NTS-2, the first "Block 1" GPS satellite was launched, part of the operational test phase of the GPS program. By 1990 the Block 1 constellation included six functioning satellites launched between 1978 and 1985. It has been recognized for some time that high-precision geodetic measurements could be made by exploiting signals from artificial satellites [e.g., Preston et al., 1972; MacDoran, 1979; Counselman and Shapiro, 1979]. The Block 1 constellation has proven satisfactory for developing and refining experiment design and analytical concepts and for initiating a number of high-precision geodetic monitoring programs. The first Block 2 satellite, with a number of improvements relative to its forebears, was launched in February 1989. As of this writing, a total of 10 Block 2 satellites are in ope...

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Section: Positioningmentioning

confidence: 99%

An introduction to the global positioning system and some geological applications

Dixon¹

1991

Reviews of Geophysics

212

118

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“…Trying to overcome network dependence, the concept of Precise Point Positioning (PPP) was introduced (Malys and Jensen 1990;Zumberge et al 1997). Several centimeters accuracy results in the post-processing mode of this technique were proven by many researchers (Cai et al 2015;Fu et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Performance of Galileo-only dual-frequency absolute positioning using the fully serviceable Galileo constellation

2019

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The recent development of the Galileo space segment and the accompanying support of the International GNSS Service (IGS) allows for worldwide Galileo-only positioning. In this study, different techniques of dual-frequency absolute positioning using the fully serviceable Galileo constellation are evaluated for the first time and compared to the performance of GPS positioning. The daily static positioning based on the broadcast ephemeris using Galileo pseudoranges is significantly more accurate than the corresponding GPS solutions, obtaining the accuracy of a few decimeters. In the kinematic mode, the accuracy is better than 10 m and 20 m for the horizontal and vertical components, respectively, which is comparable to that of GPS. Precise absolute positioning using pseudorange and carrier phase Galileo observations combined with IGS Real-Time Service (RTS) or Multi-GNSS Experiment products is not yet as good as the corresponding GPS solutions. In the static mode, the root mean squared error (RMSE) between estimated and reference coordinates does not exceed 0.05 m and 0.06 m for the horizontal and vertical components, respectively. In the kinematic mode, the respective accuracies are better than 0.17 m and 0.21 m. Moreover, we show that both GPS and Galileo pseudorange solutions benefit from the RTS when compared to the broadcast solutions with the improvement in the accuracy between 10 and 59%. Remarkable results are achieved for Galileo Precise Point Positioning (PPP) solutions based on the broadcast ephemeris. In the static mode, the RMSE is 0.07 and 0.10 m for the horizontal and vertical components which is three and two times better, respectively, then the corresponding solutions based on GPS.

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“…Computing the reference position for each of the 108 permanent stations, by the Precise Point Positioning (PPP) technique [29,30], using the PPP template in gLAB. This PPP, in static mode over 24 hours of data, provides accuracies at the centimeter level [10], which are close to two orders of magnitude better than the expected accuracy of the SBAS positioning.…”

Section: Methodsmentioning

confidence: 99%

EGNOS 1046 Maritime Service Assessment

Segura

Rovira‐Garcia

Alonso

et al. 2020

Sensors

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The present contribution evaluates how the European Geostationary Navigation Overlay System (EGNOS) meets the International Maritime Organization (IMO) requirements established in its Resolution A.1046 for navigation in harbor entrances, harbor approaches, and coastal waters: 99.8% of signal availability, 99.8% of service availability, 99.97% of service continuity and 10 m of horizontal accuracy. The data campaign comprises two years of data, from 1 May 2016 to 30 April 2018 (i.e., 730 days), involving 108 permanent stations located within 20 km of the coast or in islands across the EGNOS coverage area, EGNOS corrections, and cleansed GPS broadcast navigation data files. We used the GNSS Laboratory Tool Suite (gLAB) to compute the reference coordinates of the stations, the EGNOS solution, as well as the EGNOS service maps. Our results show a signal availability of 99.999%, a horizontal accuracy of 0.91 m at the 95th percentile, and the regions where the IMO requirements on service availability and service continuity are met. In light of the results presented in the paper, the authors suggest the revision of the assumptions made in the EGNOS Maritime Service against those made in EGNOS for civil aviation; in particular, the use of the EGNOS Message Type 10.

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Geodetic point positioning with GPS carrier beat phase data from the CASA UNO Experiment

Cited by 158 publications

References 0 publications

An introduction to the global positioning system and some geological applications

An introduction to the global positioning system and some geological applications

Performance of Galileo-only dual-frequency absolute positioning using the fully serviceable Galileo constellation

EGNOS 1046 Maritime Service Assessment

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