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32211.轨道回避目标跟踪和传感器管理
[计算机、通信和其他电子设备制造业] [2014-07-18]
In this chapter, we consider the sensor management problem for tracking space targets where the targets may apply evasive maneuvering strategy to avoid being tracked by the space borne observers. We first study the case of single target tracking by a single observer and formulate the pursuit–evasion game with complete information.
关键词:传感器;轨道;人工卫星;博弈论;空间监测
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32212.等离激元纳米结构和纳米天线的感应
[计算机、通信和其他电子设备制造业] [2014-07-18]
Different EM modeling methodologies employed in the design of plasmonic nanostructures and nano-antennas are described in this chapter. The EM modeling methods discussed in this chapter involves numerical methods (FDTD and RCWA) as well as an analytical method (multipole expansion method). Moreover, we discuss in detail the different techniques that are involved in the development of plasmon-ics-active nanostructures and nano-antennas, comparing the merits and demerits of the different processes. Finally, this chapter describes current research work in several areas such as surface-enhanced Raman scattering (SERS), localized surface plasmon resonance (LSPR), as well as surface plasmon resonance (SPR) sensing and imaging. The applications of these processes for detecting chemical, biological, and biomedical species are discussed.
关键词:电浆纳米结构;电磁建模;拉曼散射
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32213.相位估计霍尔传感器和滑模观测器之间的比较
[计算机、通信和其他电子设备制造业] [2014-07-18]
This paper presents a comparison about phase estimation between Hall sensors and sliding mode observer (SMO).The phase estimation result corresponds to the control effect of Permanent-magnet Synchronous Motor (PMSM).Low-resolution Hall-effect sensor is widely used in PMSM because of its good comprehensive performance.Sliding mode observer is a frequently-used algorithm of PMSM sensorless control.The rotor phase estimated by Hall sensors has a good steady-state performance but some ripple or chattering components occur when the rotor is accelerating,decelerating or fluctuating.As a contrast,the phase estimated by SMO has an attractive robustness to speed fluctuation as well as parameter variations but the estimation result has some vibrations under steady condition which is caused by the SMO algorithm itself.This paper contrasts the SMO with Hall sensors in view of control effects both under starting state,steady state and speed fluctuation state.The comparison is illustrated by the phase estimation results and the phase currents response.All the work is realized by Matlab/Simulink and the simulation results show the relative merits of SMO and Hall sensors.
关键词:相位估计;霍尔传感器;滑模观测器;开始;稳定状态;速度波动状态
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32214.2014年7月(上半月)通信行业要闻综述
[计算机、通信和其他电子设备制造业] [2014-07-18]
《人民邮电报》7月1日报道,中国电子信息行业联合会成立大会6月28日在北京召开。中国电子信息行业联合会是由中国电子信息及相关行业的社会团体和企事业单位自愿组成的全国性、综合性、联合性、非营利性的社团组织。
点评:中国电子信息行业联合会的成立可以为行业起到桥梁纽带作用,为电子信息产业由大变强做出积极贡献,是中国电子信息产业发展进程中具有里程碑意义的一件大事。
关键词:通信行业;要闻综述
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32215.同步目标和传感器定位与位置相关的噪声统计效率
[计算机、通信和其他电子设备制造业] [2014-07-18]
This work derives the Cramer-Rao lower bound (CRLB) for an acoustic target and sensor localization system in which the noise characteristics depend on the location of the source. The system itself has been previously examined, but without deriving the CRLB and showing the statistical efficiency of the estimator used. Two different versions of the CRLB are derived, one in which direction of arrival (DOA) and range measurements are available (full-position CRLB), and one in which only DOA measurements are available (bearing-only CRLB). In both cases, the estimator is found to be statistically efficient; but, depending on the sensor-target geometry, the range measurements may or may not significantly contribute to the accuracy of target localization.
关键词:探测器;效率;噪声;统计
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32216.用于生物传感器应用的压缩传感集成电路
[计算机、通信和其他电子设备制造业] [2014-07-18]
In recent years, interest towards wearable sensors and medical monitoring has exploded. Despite e orts to improve health care with medical technology, many people still die today from the lack of proper health management. Bio-sensors can provide long-term, continuous monitoring of key bio-signals and enable proactive personal health management [1]. Since the bio-sensors are worn in some manner, ultra-low power consumption is critical. Conventional sensors use Nyquist sampling to capture key information in bio-signals; hence, the operation is very costly. Compressed sensing exploits data redundancy arising from a low rate of signi cant events in a sparse signal. The data is compressed at the sensor node and therefore, the power required to transmit the compressed information to a receiver (e.g., smartphone) is minimized. The compression factor of a sparse bio-signal can be much larger than one, thus providing signi cant power eciency in wireless sensors.
关键词:穿戴式传感器;医疗监测;生物传感器;压缩传感集成电路
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32217.便携式电磁感应传感器和集成定位
[计算机、通信和其他电子设备制造业] [2014-07-18]
SERDP project MR-1712 entitled ?Portable Electromagnetic Induction Sensor with Integrated Positioning? is slightly more than halfway complete. The transmitter (Tx) and receiver (Rx) assemblies are designed and fabricated. The data acquisition (DAQ) electronics consists of the National Instruments (NI) cRIO platform which is much lighter and more efficient that prior DAQ platforms. Software to control the cRIO DAQ process has been written in NI?s LabVIEW. This software has been used to successfully acquire initial data. Inversion of the data acquired during these initial tests has yielded satisfactory polarizabilities of a spherical target. In addition, precise positioning of the Rx assembly has been achieved via position inversion algorithms based solely on the data acquired from the receivers during the on-time of the primary field. Major tasks still to complete include redesigning and integrating new transmitter and filter board control circuitry as well as final cable construction and integration. The LabVIEW programs must also be matured to become more user friendly. A more extensive prove-out is scheduled for May,2012 after which will follow an extensive data analysis. Finally, we intend to go to Aberdeen Proving Ground in the Fall of 2012 to perform a field test of Pedemis, test its protocols, and evaluate its performance.
关键词:传感器;电磁感应;双基地检测数据管理;集成定位
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32218.用于生物信号的一种压缩传感IC
[计算机、通信和其他电子设备制造业] [2014-07-18]
关键词:生物信号;压缩传感;数据压缩
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32219.城市桥梁挠度监测中光电液杆传感器的应用
[计算机、通信和其他电子设备制造业] [2014-07-18]
The deflection which reflects the bridge linear variety is an important parameter for the evaluation of bridge safety.According to the structural characteristics of urban bridges,the connected pipe optoelectronic liquid level sensor system is a novel kind of sensor for detecting the connected pipe liquid level,which can be applied for multipoint,long-period,online,remote,automatic measurement of bridge deflection,it is not affected by the dust,humidity and fog in the urban bridge health monitoring and maintenance.At present,the system has been integrated and applied in the project of main roads bridge Online Safety Monitoring Management System in Hangzhou (Phase Ⅱ),a web-based urban bridge cluster monitoring system have been established since 2007.According to a tied arch bridge case studies,the measuring data show that the system not only can accurately collect the bridge normal deflection information and variety,but also successfully monitored the structural responses due to the Wenchuan earthquake on May 12,2008.About two-minute abrupt changes in displacement amplitude were observed in the measured signals starting at 14:37,about 9 minutes later than the earthquake's occurring.The results shows,it is an effective method for the real-time monitoring of urban bridge deflection.
关键词:城市桥梁健康监测系统;连接管;光电液体杆传感器;挠度监测
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32220.电压-频率转换器
[计算机、通信和其他电子设备制造业] [2014-07-18]
Wireless sensor networks (WSNs) are an emerging technology and certainly will be, without any doubt, a key technology in the future. To name a few, in 1999, the Business Week magazine included them as one of the most important technologies for the twenty-first century; in 2003, the Technology Review published by the MIT listed them as one of the top ten emerging technologies; and in 2006, Nature magazine dedicated a piece of news to them, entitled "2020 Computing: Everything, Everywhere," where WSN was considered to cause a huge impact in the near future. Now, in 2012, a big progress has been made in the development of these networks, and there is a continuously accelerated advancement of this technology to satisfv the demands of the market.
关键词:无线传感器网络;转换器