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Ground Penetrating Radar (GPR) is a well-received non-destructive technique for the detection of underground utilities, such as water/gas pipes, sewers, power cables, and telecommunication ducts. However, radar signatures of non-metallic pipes are generally weak in certain conditions, for instance when the surrounding soils are attenuative and/or the pipe-soils interface is non-distinguishable from...
In the exploration and evaluation of the metalliferous veins, traditional geophysical inversion method can only get the indirect parameters of the target property, but cannot accurately reflect the geological parameters of ore veins media attributes. In order to get the intrinsic geological parameters and internal distribution of the metalliferous veins by means of inversion, in this paper, we construct...
Development of accurate models of GPR antennas is being driven by research into more accurate simulation of amplitude and phase information, improved antenna designs, and better-performing forward simulations for inversion procedures. Models of a simple dipole antenna, as well as more complex models similar to a GSSI 1.5GHz antenna and a MALA Geo-science 1.2GHz antenna were investigated in free space...
In this paper, a vital sign feature (V SF) detection and search strategy using multiple UWB life-detection-radars with different locations is proposed. Firstly, the different VSFs from all single UWB life-detection radars placed on multiple radar observation points are categorized. Then, the proposed detection strategy is used for the different VSF categories. Finally, the target's spatial location...
In order to successfully identify the subsurface targets amidst the surrounding clutter, it is necessary to locate and distinguish the genuine target reflections from spurious reflections. In this paper, we propose a novel Bidimensional Empirical Mode Decomposition (BEMD) system to identify buried objects from ground penetrating radar (GPR) images. The entire process can be subdivided into four steps...
Ground penetrating radar (GPR) is often used to detect buried objects and evaluate structural condition. However, the direct wave and random noise often influence the arrival-time detection and the target-position location. We present a new application of Shearlet transform (ShT) to GPR data processing for direct wave removal and random noise suppression. ShT is a non-adaptive geometric-analysis technique,...
Obtaining high quality and easy to interpret horizontal slices of the shallow subsurface depends on how a 3D ground penetrating radar (GPR) survey is acquired and processed. A field site containing three basic target geometries of linear pipes, curvilinear roots, and small objects serves as a testbed. High-density 250 and 500 MHz single channel GPR surveys covering 250m2 were acquired to evaluate...
The results of the study of linear engineering constructions (oil and gas pipelines, bridges, power lines and so on) at river crossings are presented in this article. In our experimental studies we used a low-frequency unscreened dipole antenna with a central frequency of 50 MHz (“LogiS-Geotech”). Examples of pipeline detection in the mass of bottom sediment are presented. The speed characteristics...
The “Fortezza da Basso” (Lower Fortress) is one of the most significant monument in Florence, Italy. Currently is a prestigious facility for exhibitions and international events. The municipal government intends to built new pavilions, but the Superintendency office of monuments and cultural heritage required a critical critical historic and architectonic study including a GPR survey. In this paper...
In this paper we adopt the similarity principle to study GPR response to voids under road surface or in the levees and dams by cross-examination of GPR data acquired using both high-frequency antennas on laboratory bench-size models and low-frequency antennas in the field. In physical world the similarity principle is widely used in theoretical study and engineering practice. In short, by the similarity...
This paper describes subsurface measurements using a singlehole directional borehole radar system that revealed the presence of a kind of guided wave propagating along the borehole. The radar system used dipole arrays for both the transmitter and receiver. In this case, all the antenna elements were located off the center axis of the borehole. Computer simulations confirmed that the off-center dipole...
Interpretation of B-scans gathered using a GPR is often difficult. The difficulty can be resolved to a large extent if responses of common objects under different scenarios are known. Finite difference time domain (FDTD) simulation is widely used to understand the response of buried objects to GPR under diverse object-ground scenarios. However, relating these responses to discern inherent patterns...
This paper presents the results of an archaeological fieldwork project conducted by a pro-geophysics archaeologist (Atha) and two ‘archaeo-curious’ GPR specialists (Chang and Lai) at the San Tau backbeach site in Hong Kong. Previous small-scale test pitting suggested that the site might be a locally unique Tang dynasty cemetery, with probable later (Northern Song) activity, but grave definition was...
High-resolution geophysical data can aid in the study of faults by providing subsurface information about the geologic structure. The paper presents the results of a GPR investigation of fracture-dislocations and tension zones in the Russian North-East (Republic of Sakha (Yakutia), Anabar region), which contain structural traps for minerals. It is shown that under conditions of indistinct geomorphological...
Laboratory research was conducted on rock samples of varying humidity in a refrigerating chamber, with subsequent defrosting at a temperature of +22°C. The data presented was acquired with an OKO-2 GPR with a center frequency of 1200 MHz on river sand and rock sand of varying humidity (from 3 to 20 %) and with a change in temperature. The results of the research showed a significant difference between...
The change of moisture content will affect the vertical support force of the urban highway soil base layer directly, and high moisture content may lead to highway damage. In order to predict the moisture content by ground penetrating radar, we built a physical model with the scale of 1:1. The moisture content was measured from 22 vertical pipes and the whole moisture content was found by the physical...
Ground Penetrating Radar (GPR) is an efficient remote sensing tool for geophysical subsurface survey. These structure characteristics are recorded in radar signal profiles by means of echo detection, amplitude and phase estimation. Besides the energy attenuation and absorption of GPR EM pulse during its propagating downward direction into the ground from a transmitting antenna, the strong interferences,...
China's Mars probe including an orbiter and a landing rover will be launched by 2020. A subsurface penetrating radar (SPR) instrument has been selected to be a part of the payload on the rover. The main scientific objective of the SPR is to characterize the thickness and sub-layer distribution of the Martian soil. The SPR consists of two channels. The low frequency channel of the SPR will provide...
We present a three-dimensional scheme that can be used to compute a vertical radar profile from reflection and transmission data measured at two parallel surfaces of a dissipative medium. From this double-sided data set the reflection response of a fictitious medium with negative dissipation can be computed. The measured reflection response and the computed reflection response in the medium with negative...
Lunar Regolith Penetrating Radar (LRPR) is a high resolution penetrating and imaging radar, which is a main payload onboard the detector of Chang'E-5. It is mounted on the bottom of the detector of Chang'E-5 and its main task is to survey the lunar regolith thickness and subsurface structure of landing domain. Because the detector is static, LRPR has to work only in stationary condition and is designed...
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