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基于迭代方法的联合压缩感知与相位修正多站外辐射源雷达成像算法研究 None

Jue WANG, Jun WANG

《信息与电子工程前沿（英文）》 2018年 第19卷 第4期   页码 557-568 doi: 10.1631/FITEE.1601423

摘要： 受限于机会照射源信号通常为窄带信号，多站外辐射源雷达成像系统分辨率通常较低。另外，由于跟踪系统精度影响及站址测量过程中存在测量误差，系统成像质量会严重下降。为提高多站外辐射源雷达成像系统成像性能，开展了基于层析成像原理的高分辨外辐射源雷达成像算法研究。进一步，将压缩感知技术应用于外辐射源雷达成像系统中，以改善系统成像分辨力。最后，针对非合作平台测量误差引入的相位误差，提出相应的外辐射源雷达成像系统相位补偿方法。通过最小化图像的重构误差建立了相位误差求解模型，基于定点迭代技术对相位误差模型求解。所提相位误差补偿技术是一种非参数化方法，可用于补偿任意形式相位误差。理论分析与仿真实验验证了所提方法的有效性和收敛性。

关键词： 多站外辐射源雷达；压缩感知；相位修正；定点迭代技术    

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多用户大规模MIMO系统中基于压缩感知的结构化联合信道估计 Article

Ruo-yu ZHANG, Hong-lin ZHAO, Shao-bo JIA

《信息与电子工程前沿（英文）》 2017年 第18卷 第12期   页码 2082-2100 doi: 10.1631/FITEE.1601635

摘要： 由于在基站处部署了大量天线，因而在大规模MIMO（multiple input multiple output）系统中发射机端获取信道状态信息需要大量的导频开销。为降低该系统所消耗的导频资源，本文基于压缩感知技术，提出了一种结构化联合信道估计的方法。首先分析了实际散射环境造成的角度域信道稀疏性，其中大规模MIMO系统中地理位置临近用户的信道矩阵存在共有稀疏结构和独立稀疏结构。同时，在压缩感知的框架下，用户配备多根天线能够进一步缓解导频开销的问题并能够提高信道估计的质量。在此基础上，本文提出了一种结构化联合信道估计算法，该算法能够以低导频开销联合估计多个用户的信道状态信息。此外，提供了该算法的共有支撑集恢复的概率上界和信道估计质量的上界。仿真结果表明该结构化联合信道估计算法能提供比现有算法更低的导频开销和更高的系统吞吐量。

关键词： 压缩感知；多用户大规模MIMO；频分双工；结构化联合信道估计；导频开销降低    

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Design of an enhanced visual odometry by building and matching compressive panoramic landmarks online

Wei LU,Zhi-yu XIANG,Ji-lin LIU

《信息与电子工程前沿（英文）》 2015年 第16卷 第2期   页码 152-165 doi: 10.1631/FITEE.1400139

摘要： Efficient and precise localization is a prerequisite for the intelligent navigation of mobile robots. Traditional visual localization systems, such as visual odometry (VO) and simultaneous localization and mapping (SLAM), suffer from two shortcomings: a drift problem caused by accumulated localization error, and erroneous motion estimation due to illumination variation and moving objects. In this paper, we propose an enhanced VO by introducing a panoramic camera into the traditional stereo-only VO system. Benefiting from the 360° field of view, the panoramic camera is responsible for three tasks: (1) detecting road junctions and building a landmark library online; (2) correcting the robot’s position when the landmarks are revisited with any orientation; (3) working as a panoramic compass when the stereo VO cannot provide reliable positioning results. To use the large-sized panoramic images efficiently, the concept of compressed sensing is introduced into the solution and an adaptive compressive feature is presented. Combined with our previous two-stage local binocular bundle adjustment (TLBBA) stereo VO, the new system can obtain reliable positioning results in quasi-real time. Experimental results of challenging long-range tests show that our enhanced VO is much more accurate and robust than the traditional VO, thanks to the compressive panoramic landmarks built online.

关键词： Visual odometry     Panoramic landmark     Landmark matching     Compressed sensing     Adaptive compressive feature    

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Permeability and thermal conductivity of host compressed natural graphite for consolidated activated

Bo TIAN, Liwei WANG, Zhequan JIN, Ruzhu WANG

《能源前沿（英文）》 2011年 第5卷 第2期   页码 159-165 doi: 10.1007/s11708-011-0145-y

摘要： Permeability and thermal conductivity test units were set up to study the heat and mass transfer performance of the host material, i.e. expanded natural graphite (ENG), for consolidated activated carbon (AC) adsorbent. The permeability was tested with nitrogen as the gas source, and the thermal conductivity was studied using steady-state heat source method. The results showed that the values of permeability and thermal conductivity were 10 to 10 m and 1.7 to 3.2 W/(m·K), respectively, while the density compressed expanded natural graphite (CENG) varied from 100 to 500 kg/m . The permeability decreased with the increasing density of CENG, whereas the thermal conductivity increased with the increasing density of CENG. Then the thermal conductivity and permeability of granular AC were researched. It was discovered that the thermal conductivity of samples with different grain size almost kept constant at 0.36 W/(m·K) while the density was approximately 600 kg/m . This means that the thermal conductivity was not related to the grain size of AC. The thermal conductivity of CENG was improved by 5 to 10 times compared with that of granular AC. Such a result showed that CENG was a promising host material for AC to improve the heat transfer performance, while the mass transfer performance should be considered in different conditions for utilization of adsorbent.

关键词： permeability     thermal conductivity     expanded nature graphite     activated carbon    

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基于块稀疏的超宽带FMCW雷达ISAR大转角成像 Article

Ke JIN, Tao LAI, Gong-quan LI, Ting WANG, Yong-jun ZHAO

《信息与电子工程前沿（英文）》 2017年 第18卷 第12期   页码 2058-2069 doi: 10.1631/FITEE.1601310

摘要： 超宽带调频连续波雷达可凭借大带宽获得极高的距离分辨率。同时，结合逆合成孔径技术，在大转角条件下进一步得到二维高分辨目标图像。然而，在逆合成孔径雷达中的距离—方位耦合问题严重制约了成像性能。本文基于转台模型的假设，研究传统的匹配滤波类算法，如距离多普勒算法和后向投影算法。为消除传统算法中的高旁瓣效应，进一步探索压缩感知类算法。考虑到高分辨条件下信号的块稀疏特性，本文重点研究了基于块稀疏的自适应匹配追踪大转角ISAR（inverse synthetic aperture radar）成像算法。通过信号对字典的匹配追踪与回溯更新，将雷达回波在未知稀疏度下精确重构，最终得到目标ISAR图像。计算机仿真、简单目标和复杂目标实验结果证明了该算法相比其他算法的有效性和优越性。

关键词： 调频连续波；逆合成孔径雷达；匹配滤波；压缩感知；块稀疏    

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Novel sensing techniques for full-scale testing of civil structures

Kaoshan DAI, Zhenhua HUANG

《结构与土木工程前沿（英文）》 2012年 第6卷 第3期   页码 240-256 doi: 10.1007/s11709-012-0172-8

摘要： Performing full-scale structural testing is an important methodology for researchers and engineers in the civil engineering industry. Full scale testing helps the researchers understand civil infrastructures’ loading scenarios, behaviors, and health conditions. It helps the engineers verify, polish, and simplify the structural design and analysis theories. To conduct a full-scale structural testing, sensors are used for data acquisitions. To help structural researchers and engineers get familiar with sensing technologies and select the most effective sensors, this study reviewed and categorized new sensing techniques for full-scale structural testing applications. The researchers of this study categorized sensors used for civil-infrastructure testing into traditional contact sensors and remote sensors based upon their application methodologies, and into cabled sensors and wireless sensors based upon their data communication strategies. The detailed descriptions of wireless sensors and remote sensing techniques and their on-site full-scale applications are presented.

关键词： sensing technique     full-scale testing     wireless sensor     remote sensing     LiDAR     laser vibrometer    

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An Ultracompact Spoof Surface Plasmon Sensing System for Adaptive and Accurate Detection of Gas Using

Xuanru Zhang,Jia Wen Zhu,Tie Jun Cui,

《工程（英文）》 doi: 10.1016/j.eng.2023.05.013

摘要： Resonantly enhanced dielectric sensing has superior sensitivity and accuracy because the signal is measured from relative resonance shifts that are immune to signal fluctuations. For applications in the Internet of Things (IoT), accurate detection of resonance frequency shifts using a compact circuit is in high demand. We proposed an ultracompact integrated sensing system that merges a spoof surface plasmon resonance sensor with signal detection, processing, and wireless communication. A software-defined scheme was developed to track the resonance shift, which minimized the hardware circuit and made the detection adaptive to the target resonance. A microwave spoof surface plasmon resonator was designed to enhance sensitivity and resonance intensity. The integrated sensing system was constructed on a printed circuit board with dimensions of 1.8 cm × 1.2 cm and connected to a smartphone wirelessly through Bluetooth, working in both frequency scanning mode and resonance tracking mode and achieving a signal-to-noise ratio of 69 dB in acetone vapor sensing. This study provides an ultracompact, accurate, adaptive, sensitive, and wireless solution for resonant sensors in the IoT.

关键词： Spoof surface plasmons     Internet of Things     Integrated sensing     Resonance tracking     Microwave sensing    

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Quorum sensing regulation methods and their effects on biofilm in biological waste treatment systems:

《环境科学与工程前沿（英文）》 2022年 第16卷 第7期 doi: 10.1007/s11783-021-1495-2

摘要：

• Quorum sensing enhancement and inhibition methods are summarized.

关键词： Quorum sensing     Biological waste treatment     Biofilm formation    

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Plasma-enabled sensing of urea and related amides on polyaniline

Harinarayanan Puliyalil,Petr Slobodian,Michal Sedlacik,Ruhan Benlikaya,Pavel Riha,Kostya (Ken) Ostrikov,Uroš Cvelbar

《化学科学与工程前沿（英文）》 2016年 第10卷 第2期   页码 265-272 doi: 10.1007/s11705-016-1570-6

摘要： The atmospheric pressure plasma jet (APPJ) was used to enhance the sensitivity of industrially important polyaniline (PANI) for detection of organic vapors from amides. The gas sensing mechanism of PANI is operating on the basis of reversible protonation or deprotonation, whereas the driving force to improve the sensitivity after plasma modifications is unknown. Herein we manage to solve this problem and investigate the sensing mechanism of atmospheric plasma treated PANI for vapor detection of amides using urea as a model. The results from various analytical techniques indicate that the plausible mechanism responsible for the improved sensitivity after plasma treatment is operating through a cyclic transition state formed between the functional groups introduced by plasma treatment and urea. This transition state improved the sensitivity of PANI towards 15 ppm of urea by a factor of 2.4 times compared to the non-treated PANI. This plasma treated PANI is promising for the improvement of the sensitivity and selectivity towards other toxic and carcinogenic amide analytes for gas sensing applications such as improving material processing and controlling food quality.

关键词： gas sensing     urea     PANI     amides     plasma    

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Multi-scale UDCT dictionary learning based highly undersampled MR image reconstruction using patch-based constraint splitting augmented Lagrangian shrinkage algorithm

Min YUAN,Bing-xin YANG,Yi-de MA,Jiu-wen ZHANG,Fu-xiang LU,Tong-feng ZHANG

《信息与电子工程前沿（英文）》 2015年 第16卷 第12期   页码 1069-1087 doi: 10.1631/FITEE.1400423

摘要： Recently, dictionary learning (DL) based methods have been introduced to compressed sensing magnetic resonance imaging (CS-MRI), which outperforms pre-defined analytic sparse priors. However, single-scale trained dictionary directly from image patches is incapable of representing image features from multi-scale, multi-directional perspective, which influences the reconstruction performance. In this paper, incorporating the superior multi-scale properties of uniform discrete curvelet transform (UDCT) with the data matching adaptability of trained dictionaries, we propose a flexible sparsity framework to allow sparser representation and prominent hierarchical essential features capture for magnetic resonance (MR) images. Multi-scale decomposition is implemented by using UDCT due to its prominent properties of lower redundancy ratio, hierarchical data structure, and ease of implementation. Each sub-dictionary of different sub-bands is trained independently to form the multi-scale dictionaries. Corresponding to this brand-new sparsity model, we modify the constraint splitting augmented Lagrangian shrinkage algorithm (C-SALSA) as patch-based C-SALSA (PB C-SALSA) to solve the constraint optimization problem of regularized image reconstruction. Experimental results demonstrate that the trained sub-dictionaries at different scales, enforcing sparsity at multiple scales, can then be efficiently used for MRI reconstruction to obtain satisfactory results with further reduced undersampling rate. Multi-scale UDCT dictionaries potentially outperform both single-scale trained dictionaries and multi-scale analytic transforms. Our proposed sparsity model achieves sparser representation for reconstructed data, which results in fast convergence of reconstruction exploiting PB C-SALSA. Simulation results demonstrate that the proposed method outperforms conventional CS-MRI methods in maintaining intrinsic properties, eliminating aliasing, reducing unexpected artifacts, and removing noise. It can achieve comparable performance of reconstruction with the state-of-the-art methods even under substantially high undersampling factors.

关键词： Compressed sensing (CS)     Magnetic resonance imaging (MRI)     Uniform discrete curvelet transform (UDCT)     Multi-scale dictionary learning (MSDL)     Patch-based constraint splitting augmented Lagrangian shrinkage algorithm (PB C-SALSA)    

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我国遥感数据的集成与共享研究

周成虎,欧阳,李增元

《中国工程科学》 2008年 第10卷 第6期   页码 51-55

摘要：

随着在轨运行服务卫星数量地不断增加和数据获取能力地不断增强，可利用的遥感数据成倍数增加，遥感数据集成与共享成为时代的潮流。在分析国际发展现状的基础上，进一步总结出国际发展的全球化、系统化、规范化、网络化等特征；在分析评价我国现有遥感数据资源和集成共享现状的基础上，进一步提出了我国开展遥感数据集成与共享的几点建议和设想。

关键词： 遥感数据     集成     共享    

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海洋光学遥感技术的发展和前沿

潘德炉,李炎

《中国工程科学》 2003年 第5卷 第3期   页码 39-43

摘要：

空间遥感与信息技术已经发展成为满足人类对海洋资源和环境不同尺度和不同层次连续、动态的信息需求的必要手段。海洋光学遥感在实施大范围海面瞬间信息监测、数年至几十年长序列全球海洋数据采集等方面，发挥了常规调查方法所不能替代的优势。从20世纪70年代开始，国际上发展了利用测量离水辐射率的原理，用现代的卫星遥感技术来实时监测海洋水色环境。80年代以来，我国对该项高技术也十分重视，并有了长足进展。文章回顾我国近20年来海洋光学遥感技术的发展；讨论了当前国家在海洋权益、防灾减灾、海洋资源管理和开发等方面的进一步需求；论述了该技术在环境监测应用导向下的前沿，如：高精度分析和定量化、高频率长序列监测和业务化趋向、多平台监测数据同化和核心技术合成。

关键词： 海洋光学     遥感技术     发展前沿    

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Soft curvature sensors for measuring the rotational angles of mechanical fingers

Haixiao LIU, Li LI, Zhikang OUYANG, Wei SUN

《机械工程前沿（英文）》 2020年 第15卷 第4期   页码 610-621 doi: 10.1007/s11465-020-0596-0

摘要： The design, fabrication, and testing of soft sensors that measure elastomer curvature and mechanical finger bending are described in this study. The base of the soft sensors is polydimethylsiloxane (PDMS), which is a translucent elastomer. The main body of the soft sensors consists of three layers of silicone rubber plate, and the sensing element is a microchannel filled with gallium-indium-tin (Ga-In-Sn) alloy, which is embedded in the elastomer. First, the working principle of soft sensors is investigated, and their structure is designed. Second, the relationship between curvature and resistance is determined. Third, several sensors with different specifications are built in accordance with the structural design. Experiments show that the sensors exhibit high accuracy when the curvature changes within a certain range. Lastly, the soft sensors are applied to the measurement of mechanical finger bending. Experiments show that soft curvature sensors can effectively reflect mechanical finger bending and can be used to measure the bending of mechanical fingers with high sensitivity within a certain working range.

关键词： soft sensor     Ga-In-Sn alloy     strain sensing     curvature sensing     mechanical finger bending    

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Performance, emission and combustion characteristics of CI engine fuelled with diesel and hydrogen

R. Senthil KUMAR,M. LOGANATHAN,E. James GUNASEKARAN

《能源前沿（英文）》 2015年 第9卷 第4期   页码 486-494 doi: 10.1007/s11708-015-0368-4

摘要： Hydrogen (H ) is being considered as a primary automotive fuel and as a replacement for conventional fuels. Some of the desirable properties, like high flame velocity, high calorific value motivate us to use hydrogen fuel as a dual fuel mode in diesel engine. In this experiment, hydrogen was inducted in the inlet manifold with intake air. The experiments were conducted on a four stroke, single cylinder, water cooled, direct injection (DI), diesel engine at a speed of 1500 r/min. Hydrogen was stored in a high pressure cylinder and supplied to the inlet manifold through a water-and-air-based flame arrestor. A pressure regulator was used to reduce the cylinder pressure from 140 bar to 2 bar. The hydrogen was inducted with a volume flow rate of 4l pm, 6l pm and 8l pm, respectively by a digital volume flow meter. The engine performance, emission and combustion parameters were analyzed at various flow rates of hydrogen and compared with diesel fuel operation. The brake thermal efficiency (BTE) was increased and brake specific fuel consumption (BSFC) decreased for the hydrogen flow rate of 8l pm as compared to the diesel and lower volume flow rates of hydrogen. The hydrocarbon (HC) and carbon monoxide (CO) were decreased and the oxides of nitrogen (NO ) increased for higher volume flow rates of hydrogen compared to diesel and lower volume flow rates of hydrogen. The heat release rate and cylinder pressure was increased for higher volume flow rates of hydrogen compared to diesel and lower volume flow rates of hydrogen.

关键词： hydrogen     brake thermal efficiency     crank angle     compressed ignition (CI)    

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标题 作者 时间 类型 操作

基于迭代方法的联合压缩感知与相位修正多站外辐射源雷达成像算法研究

Jue WANG, Jun WANG

期刊论文

多用户大规模MIMO系统中基于压缩感知的结构化联合信道估计

Ruo-yu ZHANG, Hong-lin ZHAO, Shao-bo JIA

期刊论文

Design of an enhanced visual odometry by building and matching compressive panoramic landmarks online

Wei LU,Zhi-yu XIANG,Ji-lin LIU

期刊论文

Permeability and thermal conductivity of host compressed natural graphite for consolidated activated

Bo TIAN, Liwei WANG, Zhequan JIN, Ruzhu WANG

期刊论文

基于块稀疏的超宽带FMCW雷达ISAR大转角成像

Ke JIN, Tao LAI, Gong-quan LI, Ting WANG, Yong-jun ZHAO

期刊论文

Novel sensing techniques for full-scale testing of civil structures

Kaoshan DAI, Zhenhua HUANG

期刊论文

司景舰：基于压缩感知的能源金融高频时间序列数据重构（2020年7月12日）

2022年06月10日

会议视频

An Ultracompact Spoof Surface Plasmon Sensing System for Adaptive and Accurate Detection of Gas Using

Xuanru Zhang,Jia Wen Zhu,Tie Jun Cui,

期刊论文

Quorum sensing regulation methods and their effects on biofilm in biological waste treatment systems:

期刊论文

Plasma-enabled sensing of urea and related amides on polyaniline

Harinarayanan Puliyalil,Petr Slobodian,Michal Sedlacik,Ruhan Benlikaya,Pavel Riha,Kostya (Ken) Ostrikov,Uroš Cvelbar

期刊论文

Multi-scale UDCT dictionary learning based highly undersampled MR image reconstruction using patch-based constraint splitting augmented Lagrangian shrinkage algorithm

Min YUAN,Bing-xin YANG,Yi-de MA,Jiu-wen ZHANG,Fu-xiang LU,Tong-feng ZHANG

期刊论文

我国遥感数据的集成与共享研究

周成虎,欧阳,李增元

期刊论文

海洋光学遥感技术的发展和前沿

潘德炉,李炎

期刊论文

Soft curvature sensors for measuring the rotational angles of mechanical fingers

Haixiao LIU, Li LI, Zhikang OUYANG, Wei SUN

期刊论文

Performance, emission and combustion characteristics of CI engine fuelled with diesel and hydrogen

R. Senthil KUMAR,M. LOGANATHAN,E. James GUNASEKARAN

期刊论文