No-dig-utility-mapping technology is important in data acquisition for computation,
modeling and control of underground infrastructure systems. Classic mapping technologies
(excavation, old maps) cannot follow the dynamics of development and repair of pipelines. Our
work has shown that the use of GPR in combination with GPS is a more reliable method.
A direct consequence of the classical approach is an expensive, uncoordinated process of
establishing new pipelines accompanied with damage to existing utilities. Low quality information
about, for example, city gas line network, implicitly affects the flexibility of that system. This can
be seen in the difference between the amount of processed and distributed gas. When correct
information about position and diameter of gas pipes exists, then it is possible to prevent potential
danger and damage during other facilities excavations and to achieve real parameters of network
flow and pressure calculation.

ABSTRACT

This paper describes modern, non-invasive data acquisition methods for underground utility
detection. The work presents the possibilities of connecting data acquired with a Ground Penetrating Radar (GPR) with GPS data and the joint use of these technologies in the mapping of underground mid-pressure gas line network. The aim of this paper is to show the methods of data acquisition, interpretation and presentation that were developed for the mapping of mid-pressure gas line network in the city of Kikinda and its surrounding area. All principles of the above methods were successfully applied during the realization of the gas line detection project done for the Serbian National Gas Company.

Key words: Ground Penetrating Radar, Penetration depth, Pipeline route, Post processing kinematic, RAdar Data ANalyzer, Subterrestrial detection, Transformation parameters

INTRODUCTION

No-dig-utility-mapping technology is important in data acquisition for computation,
modeling and control of underground infrastructure systems. Classic mapping technologies
(excavation, old maps) cannot follow the dynamics of development and repair of pipelines. Our
work has shown that the use of GPR in combination with GPS is a more reliable method.
A direct consequence of the classical approach is an expensive, uncoordinated process of
establishing new pipelines accompanied with damage to existing utilities. Low quality information
about, for example, city gas line network, implicitly affects the flexibility of that system. This can
be seen in the difference between the amount of processed and distributed gas. When correct
information about position and diameter of gas pipes exists, then it is possible to prevent potential
danger and damage during other facilities excavations and to achieve real parameters of network
flow and pressure calculation.
Participants in the process of digital spatial data production, maintenance and management,
as well as numerous users, who base their work on using spatial information, have the need to
increase their efficiency. One of the ways to do this is implementing of the geo-information system.
Considering the fact that spatial registers are extensive, the processes of producing data in digital
form, maintenance and management are very complex tasks.

BASIC TECHNOLOGY CONCEPTS

The Ground Penetrating Radar (GPR) is a device used for non-invasive scanning and precise
detection of underground utilities. GPR is composed of a receiver and transmitter antenna, a control unit with Win CE OS, battery supply and a survey cart. Survey cart is a tricycle equipped with incremental encoder. The incremental encoder is used for precise positioning of the center of
antenna above a pipeline route. The GPR also has a marker which is useful for marking interesting
details on a radar scan. The GPR can be equipped with a GPS (Global Positioning System) rover
that is used for measuring spatial coordinates of the projection of the pipeline route on the site
surface. The GPS rover can measure coordinates either independently or synchronized with the
GPR scan. In the second case, the GPS rover measures all points on the scanned trajectory, or just the start and end coordinates. Synchronized work implies direct communication between the GPS rover and the GPR device. Measurement of pipeline parameters with GPR and GPS measurement coordinates on the site surface are with centimeter accuracy. This measurement accuracy satisfies geodetic-mapping laws [1]. Figure 1 shows the GPR and GPS equipment.

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