Development of High-Speed Ultrawideband Ground-Penetrating Radar for Rebar Detection

Xu, Xianli; Xia, Tian; Venkatachalam, Anbu; Huston, Dryver R.

doi:10.1061/(asce)em.1943-7889.0000458

Cited by 50 publications

(14 citation statements)

References 20 publications

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“…where ε c is the relative dielectric constant of the concrete which equals about 4.1 according to our measurements conducted in [17]- [20], V is the speed of light in air, V c is calculated to be 1.48 × 10 8 m/s. Using (13) with t = 1.375 ns, the rebar burying depth from concrete surface is computed to be 102 mm approximately, which is in good agreement with the physical setups (98.6/108 mm depths) described in Section II.…”

Section: A Rebar Test Resultsmentioning

confidence: 99%

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2-D Entropy and Short-Time Fourier Transform to Leverage GPR Data Analysis Efficiency

Zhang

Candra

Wang

et al. 2015

IEEE Trans. Instrum. Meas.

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Accurate detection of singular region using groundpenetrating radar (GPR) is very useful in assessing roadway pavement, bridge deck concrete structure, and railroad ballast conditions. To locate an object within the large radargram involves extensive computational resources and time, especially when the data of interests only possess a small portion of the whole big data set. Therefore, an efficient GPR signal-processing technique is highly demanded. This paper proposes the use of 2-D entropy analysis to narrow down the data scope to the interested regions, which can considerably reduce computational cost for more sophisticated data postprocessing. Joint timefrequency analysis using short-time Fourier transform is then performed for singular region location detection and refinement. The proposed methodology is tested with different laboratory setups. The analysis results show good agreement with physical configurations.

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Section: A Rebar Test Resultsmentioning

confidence: 99%

“…In this paper, the experimental data are collected with our impulse GPR system developed in [17]- [20]. Fig.…”

Section: A System Setupmentioning

confidence: 99%

2-D Entropy and Short-Time Fourier Transform to Leverage GPR Data Analysis Efficiency

Zhang

Candra

Wang

et al. 2015

IEEE Trans. Instrum. Meas.

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“…Its value is measured to be 4.1 approximately according to our measurements [9,10,11]. C is the speed of light in air.…”

Section: Experiments Results and Discussionmentioning

confidence: 99%

Two dimensional entropy and short time Fourier Transform application on ground penetrating radar data analysis

et al. 2013

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Accurate detection of rebar location using Ground Penetrating Radar (GPR) proves to be very useful in assessing roadway/bridge deck concrete structure. Due to large signal processing resource needed to locate and image rebar on a whole road structure, more efficient signal processing method is needed. This paper proposes to combine two-dimensional (2D) entropy algorithm to narrow down the scope of interested data from large radar data set and Short Time Fourier Transform (STFT) algorithm to perform further feature characterization. To validate the analysis, experiments with different rebar setups are conducted. A. Windowing 2D Entropy MethodEntropy is a statistical measure of uncertainty in a collection of random data based on Shannon's theory [7]. A high entropy value indicates the high degree of similarities in a section of collected data whereas a low entropy value indicates distinctiveness. Assuming the received GPR reflection signal Y(t) can be modeled with the following equation:

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“…To solve this problem, in our early publication [7,13,14], OFDM spread spectrum technique was developed for multi-tone signal generation and transmission. By making different frequency tones orthogonal among each other, their cross interferences are minimized.…”

Section: Introductionmentioning

confidence: 99%

Compressive orthogonal frequency division multiplexing waveform based ground penetrating radar

Zhang

Wang

Xia

2015

2015 IEEE Radar Conference (RadarCon)

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Non-destructive evaluation (NDE) of transportation infrastructure using ground penetrating radar (GPR) is an active research subject in now days. Impulse radar is one common GPR design scheme for its simple circuit architecture. However its weaknesses include low dynamic range and high cost complicate analog-to-digital converter (ADC) requirement. Stepped frequency continuous wave (SFCW) radar overcomes these obstacles by transmitting/receiving individual frequency tones sequentially, however with a low operating speed. This paper proposes a compressive orthogonal frequency division multiplexing (OFDM) based GPR architecture to leverage operating efficiency. OFDM technique enables multi-tone frequency transmission/receiving, and CS technique allows sensing with reduced set of frequency tones without compromising sensing accuracy. The proposed compressive OFDM GPR design is evaluated using field data collected with a commercial GPR system.

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Development of High-Speed Ultrawideband Ground-Penetrating Radar for Rebar Detection

Cited by 50 publications

References 20 publications

2-D Entropy and Short-Time Fourier Transform to Leverage GPR Data Analysis Efficiency

2-D Entropy and Short-Time Fourier Transform to Leverage GPR Data Analysis Efficiency

Two dimensional entropy and short time Fourier Transform application on ground penetrating radar data analysis

Compressive orthogonal frequency division multiplexing waveform based ground penetrating radar

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