Multi sensor systems are used for an extensively and efficiently data acquisition, which leads to the creation of planning criteria, machine control, performing quality testing or documenting workflow, for instance. The recorded object can be modeled or controlled according to the integrated sensor modules of the measuring system. Thus, beside pure geometrical information like position, size and surface structure, characteristics like material, color or temperature can be determined if necessary. Especially at track surveying multi sensor systems have found a wide range of application. The track geometry of a subgrade is defined by a sequence of individual subgrade elements. Measuring profiles are determined in certain intervals to transfer the geometrical information along the subgrade for pegging and monitoring purpose at which due to the repeating measuring process automated track surveying systems are normally applied. The track surveying system RACER II (rapid automated control equipment for rails) determines the track geometry by contact- free measurement of the rail surface based on laser triangulation sensors and thereby represents a fast and low-wear multi sensor system. The RACER II was specially developed for the high accuracy requirements for monitoring the installation of the slab track within the Gotthard base tunnel. The relative orientation of the four integrated laser triangulation sensors on the measuring platform, whose knowledge has to be assumed, is described by 6 parameters (3 translations, 3 rotations) for each sensor (6 DoF, degrees of freedom). As neither the point of origin, nor the direction of the coordinate axis of the laser triangulation sensors can be signalized directly, the 6-DoF parameters have to be determined indirectly. Within this thesis, approaches to solve the determination of 6-DoF parameters from different reference geometries as well as the practical implementation for the RACER II are described. Another focus is the deduction of the track geometry from measuring data of the laser triangulation sensors linked with tachymetric measurements for the georeferencing. For this, this thesis makes a contribution concerning data handling, segmentation and modeling as well as implemented procedures for quality assurance for the measurement data of the laser triangulation sensors by the example of the RACER II. The compliance of project-specific accuracy requirements is confirmed by extensive validation measurements.    «

Multi sensor systems are used for an extensively and efficiently data acquisition, which leads to the creation of planning criteria, machine control, performing quality testing or documenting workflow, for instance. The recorded object can be modeled or controlled according to the integrated sensor modules of the measuring system. Thus, beside pure geometrical information like position, size and surface structure, characteristics like material, color or temperature can be determined if...    »