A5100784938- Advanced SAR Imaging Techniques
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Microwave Imaging and Scattering Analysis
- Sparse and Compressive Sensing Techniques
- Radar Systems and Signal Processing
- Infrared Target Detection Methodologies
- Spam and Phishing Detection
- Ultrasonics and Acoustic Wave Propagation
- Satellite Communication Systems
- Artificial Intelligence in Healthcare
- Microstructure and Mechanical Properties of Steels
- Particle accelerators and beam dynamics
- Diamond and Carbon-based Materials Research
- Thermal Analysis in Power Transmission
- Gait Recognition and Analysis
- Railway Engineering and Dynamics
- Orthopedic Surgery and Rehabilitation
- Advanced Malware Detection Techniques
- Railway Systems and Energy Efficiency
- Metal and Thin Film Mechanics
- Space Satellite Systems and Control
- Elbow and Forearm Trauma Treatment
- Multimedia Communication and Technology
- Blockchain Technology Applications and Security
- Data Mining Algorithms and Applications
Nanjing Institute of Technology
2017-2024
Chinese Academy of Sciences
2020-2023
National Time Service Center
2020-2023
National University of Defense Technology
2015-2022
Xi'an Institute of Optics and Precision Mechanics
2021
Shanghai Power Equipment Research Institute
2021
Nanjing University of Aeronautics and Astronautics
2011-2020
Target (United States)
2020
Wuhan University of Technology
2017
Guangzhou University of Chinese Medicine
2016
Large studies on semen quality of the general healthy population from China are rare.A cross-sectional study was performed to evaluate 1346 men residing in Chongqing area southwest 2007. The parameters were measured and compared with World Health Organization (WHO) criteria. A linear regression model used examine determinants quality.The medians 2.3 ml for volume, 77.8 x 10(6) per concentration, 167.7 total sperm count, 33% rapid progressive motility, 52.6% motility 70.9% motility. According...
360-degree video synthetic aperture radar (VideoSAR) presents a powerful capability for the information perception of dynamic scenes. In comparison to time-consuming airborne SAR, miniature SAR (MiniSAR) mounted on an unmanned aerial vehicle platform is cost-effective configuration that provides higher operation flexibility acquisition. Nevertheless, MiniSAR system development and signal processing limited by multiple factors are still challenging issues, including restricted weight, volume,...
Traditional multi-level security (MLS) systems have the defect of centralizing authorized facilities, which is difficult to meet requirements modern distributed peer-to-peer network architecture. Blockchain widely used in field access control with its decentralization, traceability and non-defective modification. Combining blockchain technology Bell-LaPadula model, we propose a new named BC-BLPM, for MLS environment. The "multi-chain" architecture dividing resources into isolated domains,...
The 2-D inverse synthetic aperture radar (ISAR) images of space targets vary with the viewing angles and are not suitable for automatic target recognition (ATR), thus requiring 3-D reconstruction techniques. Conventional techniques either use monostatic incoherent processing retrieval or exploit multistatic but coherent reconstruction. In this article, we combined aspects to investigate reflectivity radar. Space objects periodically revisit same ground area. Multipass interferometric...
This paper is reporting some experimental results of compressed inverse synthetic aperture radar (ISAR) imaging. Autofocusing applied on the sparse echoes, which consists range alignment and phase correction as in conventional ISAR processing. Range implemented through minimizing entropy average profile, while accomplished using eigenvector method. Experimental have validated presented autofocusing scheme, suggested further applicability sensing (CS) technique.
In electromagnetic launch (EML) applications, a compensated pulsed alternator is an effective form of power supply because its high energy density and density. The basic advantages alternators for EML applications are their higher than capacitors export ac output that suitable transmission transformation. general, external excitation adopted as self-excitation or pulse in with iron core air core. Using this not only results heavy bulky components but also complicates reduces the reliability...
Unlike computer vision datasets, aerial images often come with prior knowledge on the distance between object of interest and sensors, which makes it possible to recover sizes targets before making any predictions. On other hand, these usually consist large amount both out-of-library (OOL) high values clutters, very challenging strike a balance recall rate precision. To effectively combine complementary information contained in collected by synthetic aperture radar (SAR) systems infrared...
Motion compensation is a key procedure in inverse synthetic aperture radar (ISAR) imaging. The authors regard the motion as multi‐parameter estimation problem. Based on designing structured Gram matrices optimisation method, novel method presented. This consists of two parts: range alignment algorithm and phase algorithm. former estimates offset each profile by using criterion, which makes correlations among all profiles approaching to maximum values simultaneously. Also, latter can extract...
With the development of online social networks, a special group users named organized posters (or Internet water army, paid in some literatures) have flooded network communities. They are groups to post with specific purposes and sometimes even confuse or mislead normal users. In this paper, we study individual characteristics posters. A classifier is constructed based on detect them. Extensive experimental results three real datasets demonstrate that our method using SVM model (IGCSVM)...
SAR raw data missing occurs when radar is interrupted for various reasons. In order to deal with this problem, a method proposed focus the via stage-wise orthogonal matching pursuit (StOMP). A reference function in time domain designed data. After matched function, energy of concentrated two-dimensional frequency domain. Then, StOMP algorithm available recover The recovered be processed traditional imaging algorithms. Omega-K chosen experiments. Point target and area simulations are carried...
In this paper, we propose a novel orthogonal frequency-division multiplexing (OFDM) waveform with low probability of intercept (LPI) and the corresponding synthetic aperture radar (SAR) processing algorithm. The OFDM has random spectrum for each pulse, making it good candidate system implementation. SAR algorithm eliminates influence uses matched filtering, which same signal-to-noise ratio (SNR) gain as LFM signals. Simulation results illustrating spectrogram proposed algorithm's performance...
Inherent vulnerabilities seriously weaken global navigation satellite system service capability, particularly in hostile environments where electronic jamming, blocking, and deception can occur. A new positioning technique is proposed that based on via signals of opportunity using communication satellites as a supplement backup for GNSS. Based the principle very long baseline interferometry, observes passively without demodulated signals, realises time delay measurements, then completes...
Many responsive civilian or military space missions require that a certain ground site of interest be visited in fairly short period (e.g., 12 h less). To this end, constellation must utilized, since single satellite is usually unable to fulfill such task if the selected on whole terrestrial surface responding random user requirements. In paper, design approaches for visiting based track adjustment are investigated. By using difference orbit between maneuvered and reference make shift,...
We illustrate the principle of Digital satellite TV differential timing (DSTVDT) and propose an optimal weighting method that reduces error introduced by ephemeris error. A mathematical formula for is derived analyzed. On basis formula, proposed based on multi-base stations presented. The results data simulation experiments show when applied, a 10km, ephemeris-introduced less than 10ns, which important improving accuracy stability system.
This paper is reporting some experimental results of compressed inverse synthetic aperture radar (ISAR) imaging. The autofocusing procedure accepting sparse echoes developed, which consists range alignment and phase correction as in conventional ISAR processing. Range implemented through minimizing the entropy average profile, while accomplished using eigenvector method. presented have suggested further applicability sensing (CS) technique.
Recent literature shows that with sufficient cyclic prefix, orthogonal frequency-division multiplexing signals can convert a synthetic aperture radar (SAR) image interrange cell interference (IRCI) to an IRCI-free SAR image. In this letter, the imaging algorithm is carefully investigated and it shown range reconstruction accuracy be further improved. By reformulating system model in linear form, minimum variance unbiased estimator of profile derived, which attain Cramer-Rao lower bound,...
aDepartment of Orthopaedics, The First Affiliated Hospital Guangzhou University Chinese Medicine bThe Clinical College Medicine,Guangzhou City, Guangdong Province, China Correspondence to Xiao-Hui Zheng, MB, Department Medicine, No. 16 Jichang Road, Province 510405, Tel/fax: +86 020 365 91317; e-mail: [email protected]
Previous study indicated that heating of paraffin sections at 90-140°C prevented their detachment from slides, but thickness was reduced by half and staining affected with structures even disappearing.This aimed to determine the effects section drying a temperature lower than melting point paraffin.6 serial (thickness set 10 μm) were cut each 12 embedded testicular tissue blocks, 3 (control, randomly sampled block) placed vertically room immediately after floating onto slides water bath...
Radar imaging has been one of the basic functions for modern radar as well searching, detection and tracking, especially those ground-based space surveillance phased array radars. Due to periodic revisiting characteristics in-orbit objects, multi-pass observations targets (e.g. satellites) within small pitching angle variation can be accumulated, which lead 3D inverse synthetic aperture (ISAR) image formation. Consequently, strategy allocating limited observation resource a reliable ISAR...
Airborne synthetic aperture radar (SAR) image quality considerably degrades because of motion errors. High-precision compensation (MOCO) is necessary in an advanced SAR data processing scheme. Operation complexity and computation burden are both increased as development ultra-high resolution SAR. There two main disadvantages for conventional MOCO. Firstly, accurate envelope correction should be performed by complicated interpolation, expending a large number computing resources. In addition,...
Sliding spotlight synthetic aperture radar (SAR) is a rising imaging mode, whose azimuth resolution higher and imaged area larger. When processing data, two key problems should be considered. Firstly, system's pulse repetition frequency (PRF) always insufficient, which introduces aliasing into the spectrum. Secondly, effect of motion error enhances because longer aperture, consequently accuracy compensation (MOCO) increased. This paper presents modified scheme based on subaperture....