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Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
A novel ellipse cavity-backed and slot-tuned bow-tie antenna was designed to facilitate the application of ultra-wide band (UWB) ground penetrating radar (GPR) in low frequency. Lumped resistor loading was applied at the end of antenna arms to broaden the impedance bandwidth. Taper tuned method was also used to optimize the current distribution. Antenna characteristic was analyzed by simulation. Finally,...
We have published a ground-coupled GPR antenna array, which consists of one transmitter and five receivers, for in situ estimation of the thickness and dielectric permittivity of an asphalt pavement layer [1]. In this paper, we optimize the design of the antipodal Vivaldi antenna to pursue a higher resolution through reducing the late-time ringing. Furthermore, an off-ground antenna array is assembled,...
Compared with a conventional single-channel GPR system, a GPR system with a multi-input and multioutput (MIMO) antenna array is not only more efficient in 3D data acquisition, but also allows the collection of a multi-offset dataset, thereby providing additional information for more effective subsurface imaging. We develop a three-dimensional (3-D) reverse time migration (RTM) algorithm for processing...
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...
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...
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...
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...
We present a one-dimensional scheme to compute an image of a dissipative medium from two single-sided reflection responses without using any model information. One reflection response is measured at or above the top reflector of a dissipative medium and the other is computed as if measured at or above a medium with negative dissipation. The reflection response of a medium with negative dissipation...
Airborne ground penetrating radar (GPR) can be used for detecting underground targets in dangerous area or area covered by heavy vegetation. Since the back projection (BP) imaging method can easily compensate for the electromagnetic wave's refraction effect, it can be a practical imaging method for airborne GPR system. Nevertheless, the conventional BP imaging method usually suffers from high computational...
Ultrawideband radar has been applied in the through-wall life detection since it has high spatial resolution and better wall-penetration capability. In this paper, we perform a through-wall detection of human's motions using UWB radar. We use local mean decomposition (LMD) method to process radar signals reflected from a moving person. LMD is a new iterative approach that decomposes modulated signals...
Recently, waveform inversion is one of the most popular methods because it can provide sub-wavelength images. In the inversion of field data, the source wavelet must be estimated. Traditionally, the source wavelet is added in the inversion as a new unknown parameter and updated with iterations. When the results of the inversion are the same as the true models, the estimated source wavelet is same...
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