We consider estimation of the impact road conditions on traffic safety basis theory interaction driver with environment. It is shown that number accidents influenced by factors related to environment, traffic, users and vehicle. The mismatch between Therefore, when addressing issue improving safety, it necessary pay attention research methods, studying patterns behavior allows assess probability an accident. On conducted studies was established relationship elements indicators functional...

Problem of positioning and identification subsurface cracks in asphalt concrete pavement layers is considered. To solve the problem, use polarization state reflected signals (recording cross-polarization component signal) proposed. The algorithms for determination depth comparative algorithm estimating crack width are developed. Results numerical simulation, laboratory tests, as well results experiments on inspection roads presented.

Effective algorithm for processing impulse signals which are scattered by plane-layered media is discussed. The case, when effective thickness of layers less than spatial size an under consideration. Such problem evaluating properties (thickness) rather complicated the implementation. Brief theoretical analysis possibilities various approaches carried out. Computational and corresponding software evaluation not only a time delay, but also geometrical characteristics investigated structures...

1. Parker F., Vecellio B., Greene J. Evaluation of the accuracy pavement surface layer thickness measured with ground penetrating radar. Final report, project number 930-418, Auburn university highway research center, Auburn, Alabama, October, 1999, 132P. Google Scholar

The previously proposed method of inverse scattering problem statement and solution for plane-layered media is extended the with losses (taking into account conductivity medium). As before, algorithms processing pulse signal reflected by plane structures which was Authors constitute base. advantages this approach are combination information content UWB signals efficiency solving problems. For interpretation experimental data, Newton-Kantorovich scheme in frequency range used. Using developed...

A method for formulating and solving the inverse scattering problem is proposed. The based on well-known algorithms pulse signal processing, which are reflected by a plane layered structures. key feature of to combine features benefits different ways processing interpretation experimental data sets. Used software allowed not only establish possibility problems, but also optimize parameters setting process. results can be used nondestructive testing in biomedical research.

The results of development, tests and application the GPR for measurement road asphalt layers thickness are presented in paper. Main necessary improvements providing possibility use as a measuring device described well some inspection structure after reparation road. It was achieved accuracy better than 0.5 cm.

Some enchantment of the processing procedure ultra-wideband signal reflected by medium with thin layers are proposed. In general, essence method restoring structure a probed plane-layered is in layer restoration dielectric constant and thickness layers. The main difference between proposed algorithm previously known schemes ability to accurately determine top then restore this layer. Further determination physical geometrical parameters lower can be achieved standard methods. possible...

In the present paper one of possible approaches to solution a problem modeling propagation and diffraction UWB pulse signals on two-dimensional inclusions in plane-layered media is discussed. Key step consist direct solution, which based null-field method. As result functional equations are reduced system linear algebraic second kind, allows efficient numerical solution. Some practical results presented

The results of laboratory experiments that show the capabilities modern georadars are presented.Analysis GPR allowed to propose a new approach solving actual problem detecting subsurface cracks.The proposed method for recording pulse signals and data processing is based on algorithms software previously developed by authors.With help this carried out, possibility agreed solution choosing optimal parameters pulsed was shown.To confirm effectiveness signal methods, series were out.The version...

The GPR application scheme and subsequent numerical simulation of non rigid pavement condition are proposed. is as follows: a model the actual construction drawn up based on processing primary data survey, stress values calculated prediction further process deterioration performed. results assessment analysis make basis for designation repair measures in surveyed sections.

The paper deals with monitoring the current condition of flexible road pavement involving GPR technology. methodology using is formed on remote measurements thickness and permeability structural layers. After primary processing data they are interpreted by means developed algorithms software. Then these used to build models section deterioration. Dynamic adaptive proposed in order solve problem predicting individual local segments. mathematical apparatus dynamic model deterioration was based...

The results of laboratory experiments on the use two antenna units pulsed ground penetrating radar (GPR) for nondestructive testing are presented. have similar configuration, but different values central frequencies probing ultra wide band (UWB) pulses. purpose is to find best sensing parameters and optimize technique processing signals reflected from plane-layered media. analysis obtained showed possibility improving quality remote road pavements other building structures by means UWB GPR...

Mathematical models for prediction of road network condition based on the so-called Markov chains are presented in this article. The data calculation elements transition matrix from one to another taken visual evaluation as well instrumental reading. It is recommended prepare sets form pavement management system tables a representative sample measuring sections. Discrete time intervals – year used when constructing model matrices. procedure forming with partially complete proposed also...

The paper presents the results of experimental studies on effect secondary reflections arising from registration ultra-wideband ground-penetrating radar signals when antenna unit is located in close to external boundary probed medium. In this case, using standard calibration procedure obtain parameters sensing signal and then measuring reflected medium under study, it necessary first all investigate such resulting data sets. When formulating solving problem, take into account specific...

The possibilities of using UWB pulse signals GPR for solving inverse scattering problems, especially in the frequency domain, have been investigated. proposed computational algorithms are based on previously developed iterative schemes problems by a procedure minimizing auxiliary residual functional. To carry out experiments initial data synthesized software constructing Green function corresponding direct diffraction used. values electrical and geometric parameters plane-layer media were...

A series of laboratory experiments on sensing plane-layered media using pulsed GPR with different antenna unit was carried out. Experiments have shown that when the operator processes data even relatively simple (with minimum number layers), relative error in determining thickness layers can be quite significant. This confirms importance conducting a thorough initial calibration and accurate adherence to measurement procedure. Under certain conditions, correction factors or functions...

The possibilities of assessing the state non-rigid pavement structures with through cracks in upper layers, which based on results GPR sounding and subsequent modeling stress-strain structure, are considered. Water penetration across to lower layers may be cause an additional increase rate degradation pavement. Attraction data allows one estimate humidity structure under crack. To solve this problem, we used methods for processing pulse video signals georadars. assessment effect design was...

Essential components of the system pavement condition management (PMS) highways are assessment current state both individual sections and network as a whole prediction quantitative characteristics describing process changing parameters design road. With development technical diagnostic tools, radiophysical geo-radars, have become increasingly used to obtain primary data. Their advantages consist in possibility conducting non-destructive testing during movement, well amount initial...

The relevance of the problem follows from consideration consequences such serious road pavement defect as delamination. Also, validity stems fact that use modern pulsed GPR provides low-cost monitoring roads. This becomes possible when obtaining primary data during movement laboratory car with speed transport stream, and, in addition, due to exclusion labour-intensive operations coring or cutting sections pavement. purpose work is analyze various processing methods for ultra-wideband signals...

The article contains information on the study of possibilities introducing GPR technologies into practice road surveying. prospects for development this scientific direction are also analyzed. tasks that can be solved with use ground-penetrating radar equipment during non - rigid pavement. main reasons preventing a more dynamic implementation in construction industry considered detail. are: difficulty interpreting data, lack an instrument base, single complex and mathematical support...