GPRSIM v3.0 has an antenna design menu where both the Receiver and Transmitter response functions can be set. Ground coupled, air-coupled, bi-static, monostatic or horn antenna patterns can be used in GPRSIM simulations.
GPRSIM v3.0 has an Impulse response function menu where synthetic pulses or pulses from the ground waves of real reecorded radargrams can be inserted for simulations.
GPRSIM v3.0 has a WaveType menu for choosing the various energy paths pertinent to any particular model desgin. The unique design of GPRSIM v3.0, is that contributin components of the raytraced wavefield can be separated. This is important for removal of unwanted recorded energies in real radargrams. The menu is also designed for the user to type in their own uinique raypaths.
GPRSIM is a completely interactive 2D forward modelling software designed specifically for ground penetrating radar.
GPRSIM predicts the full waveform of microwaves that are reflected, transmitted, refracted and attenuated across model ground structures. (The complete theoretical details of GPRSIM are published in Geophysics, Goodman D., vol 59-2, p224-232, 1994)
History: GPRSIM began development in 1989 and was first coded in Fortran. The software was converted to a DOS environment with self contained graphics. The software was marketed by Geophysical Survey Systems, Inc., between 1994-1998 in which over 30 licenses were delivered. The software was redeveloped in a Windows environment in 2001 and version 2.0 was released directly by the Geophysical Archaeometry Laboratory in 2001. GPRSIM v3.0 was released in early 2006 and has been under continuous development at user requests. .
Dept of Geophysics, Aristotle University of Thessalonikki
CTBTO Preparatory Commission Vienna, Austria
Dutch National Police Agency KLPD, Netherlands
Ingenieurgesellschaft PTM Dortmund mbH, Germany
Dept of Earth Sciences, University of Toronto, Canada
Dept of Civil Engineering and Geoinformation, Oldenburg University"
Consiglio Nacionale delle Ricerche, Rome
Dept of Earth Sciences, University of Toronto, Canada
Dept of Civil Engineering and Geoinformation, Oldenburg University, Germany
Guangxi Communications Investment Group Co., Ltd, China
Jiangsu Testing Center for Quality of Construction Engineering Co. China
Tubitak Bilgem, Turkey
Jiangsu Testing Center for Quality of Construction Engineering Co., China
Tianjin Municipal Engineering Design and Research Institute, China
Northeast Forestry University, Harbin, China
China University of Petroleum, Qingdao, China
Instituto Politecnico de Tomar, Portugal
Ankara University, TUBITAK Projesi
Jiangsu Province Water Conservancy Science Research Institute
Applied Physics Laboratory, The John Hopkins University
Southwest Jiaotong University, China
Third Engineering Group, Guangdong Construction Engineering, China
Korean Expressway Corporation
Parsons Overseas (P) Limited, India
Gradar Geofysik, Italy-Sweden
Beijing Tie Jian Project Supervision Co., Ltd., China
Dept of Structures and Materials, IWHR BEIJING IWHR-KHL Co., Ltd, China
Wehrtechnische Dienststelle für Schutz und Sondertechnik Oberjettenberg, Germany
Beijing Constructional Engineering Institute, China
Beijing Municipal Engineering Research Institute, China
IPA Electronik, Turkey
Heritage Center, Stephen A Austin Univerity, Texas
Draig Geoscience, Perth, Australia
Research Institute of Building Science, Yunan Province, China
Engineering Dept, University of Central Florida
Sejong University, Korea
China Railway Engineering Co., Ltd., Gansu Province, China
Bureau of Cultural Heritage, Ministry of Culture, Taiwan
Biosystems Engineering and Soil Sciences, University of Tennessee
Geomecca Inc., Korea
Dept of Civil Engineering, National Chiao Tung Univerity, Taiwan
Tongji University, Shanghai City, China
TIanjin Survey and Design Institute for Water Transport Engineering, China
CCCC Shanghai San Hang Research Institute Co., Ltd., China
Draper Laboratory, Cambridge, MA
Beijing Syndec Instrument Co., China
Electronic Technology Research Insitute, Korea
Geotechical Korea Eng. Co., Ltd
North China University of Sciene and Technology
Changjian River Surveying Technology Research Institute, China
Electronics and Telecommunications Research Institute, Korea
GPRSIM software allows the user to design a directional response function for transmitting and receiving antenna. GPR impulse response design/extraction from real radargram is available in a separate menu.
GPRSIM Software is an easy to use radargram simulator, with a complete Windows interface.
GPRSIM has a flexible drawing menu to include circles, semi-circles, ellipses, trenches, and other special functions. Free hand drawing with lines and splines also makes it easy to insert any kind of subsurface structure the user wants to simulate.
GPRSIM can be used to show how what appear to be very simple structures buried in the ground, can actually have very complicated radar patterns. In this examples, wave energy with 2 bounces (side reflections RR) create partial hyperbolas from corner reflections.
GPRSIM can be used to model various stages of burial conditions, which is an important for studying cemetery sites.
GPRSIM can be effectively used to model layered structures for geological mapping or for geo-engineering surveys across roads and bridge decks.
Simulations of burials can sometimes help to resolve reflection patterns recorded across real burials. In the above example, taken at the Whiterock Jena Choctaw Tribal Cemetery in the Kisatchie National Forest, Louisiana (see page 1 of this website), strong reflections from a suspected coffin are recorded in real data. In addition to the main coffin anomaly, very faint dipping reflections are also observed. These reflections are believed to be from slightly rounhded edges of the burial pit, which causes detection of the corner. In the simulation, one corner of the burial pit is given a rounded edge, causing a dipping reflection that projects towards the center of the pit.
GPRSIM has a processing menu which allows the user to perform linear migration of synthetic radargrams. In the above example, a V-trench which causes complicated radargram patterns is improved from processing. Note, that with perfect synthetic data, pseudo data is mapped into areas where previously no reflections are predicted. In engineering environments with many hyperbolic and regular materials, migration can be a very useful filter process to better predict subsurface structures. In archaeological sites where ground materials are fairly heterogenous, migration has less applicability, but still remains an option as another form of data processing. GPRSIM processing options are useful to visually instruct students on GPR migration and to see the results generated real time.
GPRSIM is useful in teaching users of GPR equipment, how different structures in the ground can appear in the radargrams. "Dinosaurs do not appear as dinosaurs!!"
In this simulation a pipe in a trench located below a layer of rebar in concrete is shown.
GPRSIM v3.0 was updated in December of 2008 to do GPR simulations over sites with topography. The user can set any model section as the start location for a simulation. The possibility of doing simulations in tunnels can also be accomplished with these advanced options. The software effectively accounts for the antenna tilt and will compensate by rotating/tilting the beam in topographic simulations.