Determining rail track axis geometry using satellite and terrestrial geodetic data

Gikas, V; Daskalakis, S

dc.contributor.author	Gikas, V	en
dc.contributor.author	Daskalakis, S	en
dc.date.accessioned	2014-03-01T01:28:08Z
dc.date.available	2014-03-01T01:28:08Z
dc.date.issued	2008	en
dc.identifier.issn	0039-6265	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18724
dc.subject	Bearing diagram	en
dc.subject	Kinematic GPS	en
dc.subject	Least squares method	en
dc.subject	Rail track alignment	en
dc.subject	Tracking total stations	en
dc.subject.classification	Engineering, Civil	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.classification	Remote Sensing	en
dc.subject.other	geodesy	en
dc.subject.other	geodetic datum	en
dc.subject.other	GPS	en
dc.subject.other	least squares method	en
dc.subject.other	railway	en
dc.title	Determining rail track axis geometry using satellite and terrestrial geodetic data	en
heal.type	journalArticle	en
heal.identifier.primary	10.1179/003962608X325448	en
heal.identifier.secondary	http://dx.doi.org/10.1179/003962608X325448	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	In this paper, a multi-sensor data acquisition system and a method for extracting the track axis geometry of railways are introduced. The rail track surveying system employs GPS and a tracking total station for absolute referencing, aided by a biaxial inclinometer for reducing the data into a common datum in canted sections and a digital odometer for linear referencing. Track axis extraction depends on rail track positional data, whereas its geometric modelling is performed on the basis of design elements using the bearing diagram and the Generalised Least Squares (GLS) method on the horizontal and vertical track layout. In addition, a supplementary algorithm for computing the rail curvature is presented. Extended test runs were conducted to validate the feasibility of the system and the method. The test results show that a directional uncertainty of better than 0.01° in tangent sections and deviations between the actual and computed track radii of better than 1% in curved sections are achievable. © 2008 Survey Review Ltd.	en
heal.publisher	COMMONWEALTH ASSOC SURVEYING LAND ECONOMY, C A S L E	en
heal.journalName	Survey Review	en
dc.identifier.doi	10.1179/003962608X325448	en
dc.identifier.isi	ISI:000260426000007	en
dc.identifier.volume	40	en
dc.identifier.issue	310	en
dc.identifier.spage	392	en
dc.identifier.epage	405	en