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Real-time sampling of ground penetrating radar and related processing
2005 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Ground penetrating radar (GPR) is a technique for inspecting objects and surfaces hidden under obstructing materials. Common uses are inspections of the bedrock, ground water and other layers in the ground. It can also be used for short distance investigations where high precision is needed, such as in road quality examinations. As with all radar systems, relatively high frequency electromagnetic waves are used in ranges of 40 MHz up to several GHz. To get the resulting data in digital form, as almost always needed because of recording and postprocessing needs, analog to digital conversion must be performed. Sampling and converting such high frequency signals requires a very high sampling frequency, so high that common real-time sampling techniques have not been possible to use. Instead a technique, called time equivalent sampling, that reduces the needed sampling frequency dramatically has been used. The disadvantage of time equivalent sampling is the low speed. Recently, the ever progressing development of faster electronics has made converters with high sampling frequencies, adequate for GPR use, available. Real-time sampling of GPR opens for new signal processing possibilities, the main one being stacking of the signal. Stacking is a technique for lowering the noise of the received radar reflections, and could lead to a longer range for GPR systems. In this project, the main objective was to investigate the possibilities of performing real-time sampling, and related processing, with standard electronic hardware. In the end a prototype real-time sampling GPR system was developed. It can stack up to 3000 GPR-scans per second, and also perform filtering and other processing. As this was only a prototype, code efficiency was not a high priority and therefore a noticeable speed increase is probable after optimization.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Signal processing, Ground penetrating radar, GPR, Geophysics, Real-time sampling
Keyword [sv]
URN: urn:nbn:se:ltu:diva-53274ISRN: LTU-EX--05/039--SELocal ID: a4e5a01d-23e7-443e-8515-003a446ffb64OAI: diva2:1026648
Subject / course
Student thesis, at least 30 credits
Educational program
Computer Science and Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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