Impact of GPS satellite and pseudolite geometry on structural deformation monitoring: analytical and empirical studies

Meng, Xiaolin; Roberts, Gethin Wyn; Dodson, Alan; Cosser, Emily; Barnes, Joel; Rizos, Chris

doi:10.1007/s00190-003-0357-y

Cited by 99 publications

(69 citation statements)

References 7 publications

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“…Construction of the experimental platform was constructed in the framework of the Diploma Thesis of Spyropoulos [11]. This device is different from others used in the past mostly for the assessment of GPS measurements [10,12] because it permits oscillations with pre-defined characteristics along the vertical axis, along which GPS presents the largest uncertainties [13], and because the motion of the platform is controlled by the LVDT sensor.…”

Section: Methodsmentioning

confidence: 99%

Phase effect in time-stamped accelerometer measurements – an experimental approach

Moschas

Stiros

2012

Int. J. Metrol. Qual. Eng.

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Abstract. The phase error in a high quality accelerometer was investigated on the basis of systematic experiments on a prototype platform permitting controlled vertical harmonic oscillations. The recordings of an accelerometer and of an ultra-high frequency GPS fixed on this platform were compared with those of a LVDT transducer, controlling the platform movement. All sensors were supported by independent GPS timing. The output of this study is that the recordings of accelerometers are characterized by a random phase error, which, however, decreases with the increase of the oscillation frequency, as dictated from the laws of mechanics. Such errors are important given the increasing use of combinations of accelerometers with various sensors for a wide range of applications. A simple method for the correction of such errors is proposed.

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Section: Methodsmentioning

confidence: 99%

Phase effect in time-stamped accelerometer measurements – an experimental approach

Moschas

Stiros

2012

Int. J. Metrol. Qual. Eng.

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“…In case of applying 10-15° masks this makes observations from this direction impossible. Therefore, the observation hole is created, which is not favourable for the accuracy of determination of N coordinate (Meng et al 2004). If, additionally, terrain obstacles would exist, which could limit the visibility of satellites from the southern direction, positioning could be difficult; -limitations in the visibility of satellites by terrain obstacles.…”

Section: Gps Limitationsmentioning

confidence: 99%

Geometric Aspects of Ground Augmentation of Satellite Networks for the Needs of Deformation Monitoring

Protaziuk

2016

Artificial Satellites

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ABSTRACT. Satellite measurements become competitive in many tasks of engineering surveys, however, in many requiring applications possibilities to apply such solutions are still limited. The possibility to widely apply satellite technologies for displacements measurements is related with new challenges; the most important of them relate to increasing requirements concerning the accuracy, reliability and continuity of results of position determination. One of the solutions is a ground augmentation of satellite network, which intention is to improve precision of positioning, ensure comparable accuracy of coordinates and reduce precision fluctuations over time. The need for augmentation of GNSS is particularly significant in situations: where the visibility of satellites is poor because of terrain obstacles, when the determined position is not precise enough or a satellites constellation does not allow for reliable positioning. Ground based source/sources of satellite signal placed at a ground, called pseudosatellites, or pseudolites were intensively investigated during the last two decades and finally were developed into groundbased, time-synchronized transceivers, that can transmit and receive a proprietary positioning signal. The paper presents geometric aspects of the ground based augmentation of the satellite networks using various quality measures of positioning geometry, which depends on access to the constellation of satellites and the conditions of the observation environment. The issue of minimizing these measures is the key problem that allows to obtain the position with high accuracy. For this purpose, the use of an error ellipsoid is proposed and compared with an error ellipse. The paper also describes the results of preliminary accuracy analysis obtained at test area and a comparison of various measures of the quality of positioning geometry.

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“…This leads to the situation that there is always a large vacancy on the visible satellites sky plot in the high-latitude area (Meng et al, 2004). This paper simulates azimuth shielding, elevation shielding and strip shielding of satellites commonly seen in GNSS application.…”

Section: O P T I M I S I N G G N S S I N H a R S H O B S E R Vat I O mentioning

confidence: 99%

A New Approach for Optimising GNSS Positioning Performance in Harsh Observation Environments

et al. 2014

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Maintaining good positioning performance has always been a challenging task for Global Navigation Satellite Systems (GNSS) applications in partially obstructed environments. A method that can optimise positioning performance in harsh environments is proposed. Using a carrier double-difference (DD) model, the influence of the satellite-pair geometry on the correlation among different equations has been researched. This addresses the critical relationship between DD equations and its ill-posedness. From analysing the collected multiconstellation observations, a strong correlation between the condition number and the positioning standard deviation is detected as the correlation coefficient is larger than 0·92. Based on this finding, a new method for determining the reference satellites by using the minimum condition number rather than the maximum elevation is proposed. This reduces the ill-posedness of the co-factor matrix, which improves the single-epoch positioning solution with a fixed DD ambiguity. Finally, evaluation trials are carried out by masking some satellites to simulate common satellite obstruction scenarios including azimuth shielding, elevation shielding and strip shielding. Results indicate the proposed approach improves the positioning stability with multi-constellation satellites notably in harsh environments. K E Y

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Impact of GPS satellite and pseudolite geometry on structural deformation monitoring: analytical and empirical studies

Cited by 99 publications

References 7 publications

Phase effect in time-stamped accelerometer measurements – an experimental approach

Phase effect in time-stamped accelerometer measurements – an experimental approach

Geometric Aspects of Ground Augmentation of Satellite Networks for the Needs of Deformation Monitoring

A New Approach for Optimising GNSS Positioning Performance in Harsh Observation Environments

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