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Terahertz radar coded-aperture imaging technology can achieve high-resolution, forward-looking and staring imaging by producing spatiotemporal independent signals in the imaging area. Sparse reconstruction algorithm is efficient in the point target imaging, whereas it becomes invalid for complex area targets. This paper proposes a method combining wavelet transform and orthogonal matching pursuit...
High frequency vibration of the platform or the targets is an inevitable problem in the field of radar imaging, and it has significant effects on the image quality, especially in the terahertz band. In this paper, a compensation method for high frequency vibration based on dominant scatterers is proposed. The essence of this method is estimation and compensation of the high frequency vibration by...
Terahertz radar coded-aperture imaging technology based on fast scanning and random phase modulation can achieve high-resolution, forward-looking and staring imaging. Fast scanning with phase controlled needs accurate phase control, while random phase modulation would probably damage its accuracy. To verify the feasibility of simultaneous operation on the two function, this paper deduce the mathematical...
In this letter, a three-dimensional (3D) image reconstruction approach is proposed for terahertz (THz) holographic by a sharply reduced amount of antennas and frequency samples, without reducing the quality of the image reconstruction results. With the obtained 3D sparse random sampling data, a sparse recovery procedure combined by two-dimensional fast Gaussian gridding based non-uniform Fourier transform...
In this paper, a 0.32 THz imaging radar system was built and experiment on a precession warhead model is presented. The imaging algorithm based on range-instantaneous Doppler algorithm is adopted and high resolution ISAR imaging results are obtained. From these imaging results, we can easily recognize structures and even the subtle structures of the precession target, which verify the advantages of...
Terahertz imaging has been shown to have the potential to detect objects hidden under common coverings. In this paper, a 360° fast rotating imaging scheme for the detection of concealed objects using terahertz radar is proposed and validated by proof-of-concept experiments. The imaging results of three dangerous objects, i.e. hammer, scissor and metal handgun model, covered with fabric and cardboard...
Terahertz (THz) wave has important advantages in micro motion measurement because its wavelength is shorter than that of microwave. A method for parameter estimation of micro-vibration target based on the combination of Phase-Derived-Range (PDR) and Empirical Mode Decomposition (EMD) is proposed. In this method, the displacement of the target created by vibration is obtained firstly by using the PDR...
Eliable analysis of electromechanical systems is a worldwide challenging uestion, since there are much complex coupling relations among various system parameters. In this paper, we propose an analytical framework for reliable operations of electromechanical systems. Firstly we build a mathematical model for the motor-actuator system using basic conservative relations of physical laws. And then we...
Snake robot with universal unit is presented and studied in this paper. The universal unit greatly improves snake robot's dexterity in space, complexities in actions and varieties in kinetic pattern. The balance principle of the snake robot during climbing is analyzed. To imitate a biological snake to climb, inchworm locomotion gait along the direction of isometric spiral curve is adopted. Motion...
The random phase errors existing in the terahertz (THz) radar system, usually lead to the range profile broadened and defocused, which should be compensated. In this paper, a compensation method based on Bayesian compressive sensing (BCS) is proposed. Firstly, the reconstruction model containing the random phase errors is established. Subsequently, the phase errors is obtained using the maximum likelihood...
Detection of pedestrian micro-motion can be applied into Public security field. With shorter wavelength in Terahertz(THz), target Doppler effect is more significant, and the penetration ability is stronger. Based on a line structure pedestrian model, this research compares the characteristics of smooth and rough pedestrian in microwave band(12GHz) and THz band(140GHz and 220GHz) with frequency analysis...
The high resolution radar imaging has important applications in battlefield reconnaissance target detection and recognition et al.. Compared to microwave used in the conventional radar imaging, the terahertz wave has higher frequency and shorter wavelength and thus can provide larger absolute bandwidth. And the coded-aperture imaging is an expansion of the classic pinhole imaging, which has great...
As for nervous diseases study, building specific models tends to be really hard but significant. This paper introduces a novel method for neuron system identification using nonlinear auto-regressive Volterra (NARV) model based on the field programmable gate arrays (FPGA). We select HH model as a “black-box” system requiring identification, and obtain input and output data. A NARV model built on the...
The small-world network plays a vital role in brain function investigation and complex network study. Multi-FPGA design for the spiking neural network remains some challenges in hardware simulation and application. In this paper, a novel multi-FPGA design is proposed to implement a modular small-world network which can ensure a high computational speed and a high calculation accuracy. Time-division...
This paper presents an optimal design of dynamic wireless automatic charging system for roadway-powered electric vehicles (RPEVs), which can effectively improve the charging performance of wireless electric vehicles. For automatic charging, the optimization of industrial automation systems on the application of RPEVs can fundamentally solve a series of problems, especially for the central issue of...
Weighted-permutation entropy (WPE) is modified from permutation entropy (PE), which recently has been proposed as a measurement for nonlinear time series. To explore the efficiency of this method and the features of seizure electroencephalogram (EEG) segments, we investigate the application of WPE in the complexity analysis for epileptic seizure detection based on EEG. It is found that the calculated...
In this paper limited penetrable visibility graph (LPVG) approach is introduced to analyze the background electroencephalograph (EEG) activity in Alzheimer's disease (AD) patients. LPVG provides a measure of transforming the time series, i.e., EEG, into complex networks, which has become a research hotspot in the field of cognitive neurodynamics. So in this work, LPVG is chosen as the center method...
The regularity of the spiking activity is closely related to the neural encoding and transmission of neural information. However, it is largely unknown how the inhibitory feedback, as a common interaction existed in cortex, contributes to the precise transmission of neural information. In order to explore the answer to this question, we construct a feed-forward network (FFN) model with lateral inhibitory...
This paper adopts the visibility graph to analyze the short time series of fractal Brownian motion (fBm), and examines this method in estimating Hurst exponents. The maximum likelihood estimation is introduced to estimate the power-law index and the statistics to judge the performance of the estimation. In the result, we found that the first minimum of the Kuiper statistic can provide an optimal estimation...
As semiconductor manufacturing node getting into the era of 28 nm and below, the biggest challenge in the TiN hard mask process is getting the ultra-low compressive stress and superior thickness uniformity (THKU) at the same time. In this paper, the novel TiN films were prepared by a hard mask PVD system, which was developed by North Microelectronics Corporation (NMC). The film properties such as...
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