基于光纤光栅传感技术的周界入侵报警系统

介绍了一种基于光纤光栅传感技术的周界入侵报警系统,利用不同入侵模式信号时域及频域特征信号的差异性,采用时域与频域与信号结合的分析方法,实现对各种入侵信号的模式识别及报警判断,并通过模拟实验加以验证。实验结果表明,该系统能够实现对入侵行为的模式识别及对有害入侵模式实施报警的功能。     

基于FBG传感器的船体结构实时监测系统

为实时监测船舶在高速航行时船体结构的状态,评估船体关键部位的强度,提高船舶的安全性.基于FBG传感技术,结合船体结构特征,采用信号处理和强度评估等理论,构建船体结构强度监测体系,以实现船体结构典型位置技术状态监测及预警判断.研究成果可为各种类型船舶的安全健康监测提供一定的借鉴和参考.     

跨铁路斜拉桥健康监测与安全评估系统的建立与应用

与普通公路桥梁养护检查相比,跨铁路桥梁评定的检查复杂度、难度更高,投入的养护资金也更多.依托某跨铁路斜拉桥工程,采用无线传感技术便捷部署桥梁健康监测系统,实现快速、低成本的桥梁状态评估,为桥梁养护维修提供客观依据,从而有效降低跨铁路桥梁定检频次,实现更精准的检测资金分配.     

"两头忙"的功率控制方式

针对"两头忙"的工况特点,提出了目前在"两头忙"设计中常用的3种功率控制方式,并且介绍了其各自的工作原理和性能特点.     

摄影测量与遥感在我国铁路建设中的应用综述

研究目的:结合摄影测量与遥感技术的发展与现状,综述摄影测量与遥感技术在铁路建设中各个方面的应用情况,并分析近年来迅速发展的雷达干涉测量、高分辨率卫星遥感、高光谱遥感等新技术的具体情况及其应用潜力。研究结论:摄影测量与遥感技术在我国铁路建设中的发展有3个趋势:(1)未来5年内遥感将在空间分辨率、光谱分辨率和时间分辨率3个方面出现新的突破,形成高、中、低轨道结合,大、小、微型卫星协同,粗、精、细分辨率互补的遥感网络。(2)“3S”技术的结合,在我国铁路建设中具有广阔的应用前景,是摄影测量与遥感技术在铁路建设应用中的发展趋势之一。(3)遥感技术与虚拟现实技术结合,由此形成的铁路管理和信息服务系统形象地通过计算机提供给公众,为公众提供方便,也是铁路管理和服务未来的发展趋势之一。     

遥感技术在城市水灾模型建立中应用的探讨

本文介绍了遥感技术的发展趋势 ,初步探讨了遥感在城市水灾模型建立中的应用 ,阐述了 DEM的生成方法和有限单元法在图象配准中的应用。最后 ,采用汕头市一个区域的点高程矢量数据建立了 DEM模型 ,并用三角格网法进行配准和几何纠正 ,采用 Virtual GIS模块模拟飞行演示并录制 AVI动画文件。     

不同特征遥感图像在江滩钉螺孳生地监测中的应用

目的　探讨由LandsatETM +遥感图像组成的特征图像在江滩钉螺孳生地监测中的应用。方法　对以LandsatETM +图像组成的 3种特征图像进行非监督分类 ,并通过现场勘察和计算类别间分离度对分类结果进行评价。结果　以ETM的第 2、3、4波段组成的ETM2 34伪彩色复合图像的分类识别效果比较好 ,能有效地将江滩芦苇、梭叶草和杂草滩等识别出来 ,有助于江滩钉螺孳生地的监测。结论　遥感图像非监督分类能有效识别江滩地表植被的分布而用于钉螺孳生地的监测 ,但应根据研究地区的实际情况选择合适的特征图像。     

舰船辐射信号中压缩感知降噪性能的研究

研究了含噪信号的压缩感知方法,分析得出,在压缩采样过程中,原始信号的信息得到保留,而噪声信号的信息则被压缩和丢失,从而在信号重构时起到降低噪声的性能.采用含有高斯噪声的舰船辐射信号为例,仿真实验表明,当信噪比小于20 dB时,总存在合理的观测值,使得重构信号与原始信号的均方差比含噪信号与原始信号的均方差更小,从而起到提高信噪比的作用.     

Characteristics of wireless sensor network for full-scale ship application

In this study, basic experiments regarding the wireless sensor network were conducted on a 3,000-ton-class training ship as the first step in applying the ubiquitous technology to a real ship. Various application fields of the technology in terms of the provision of safety and convenience on a ship were identified through these experiments. To efficiently adopt the ubiquitous technology for ship application, it is necessary to identify the state-of-the-art ubiquitous technology and to prepare countermeasures against the harsh environment of a ship. The characteristics of the wireless sensor network were investigated on a test bed ashore as well as on a real ship before full-scale ship application. In particular, experimental results concerning communication depth, data transmission ratio, and battery consumption in a sensor node are described in detail.     

Hydrography, currents and distribution of suspended matter during a dumping experiment in the western Baltic Sea at a site near Warnemünde

During a dumping experiment on 20/21 June 2001, an extensive data record was collected to understand the dynamical processes in the water column of the investigation area and to validate model results. Weak westerly winds with strongly changing cloud coverage characterized the meteorological situation. During the second day the wind calmed down and moved shortly to easterly directions. The water column was characterized by a strong vertical stratification with discontinuity layers in temperature and salinity in 12 and 16 m. The current regime was dominated by outflow at the water surface and inflow along the German coast, with strong current shearing in the dumping area. The suspended matter clouds could be identified by optical methods and ADCP (Acoustic Doppler Current Profiler) scattering intensity. During the experiment the suspended matter plumes were only visible at the surface up to 1 h after the dumping. The aerial photographs document that the particle clouds at the surface drifted to the west and, after approximately 40 min, they were only weakly visible. The fine material was concentrated in the discontinuity layer leading to substantially higher values of optical parameters and suspended matter concentration than measured in the surface clouds. Due to the vertical current shears the material was transported in the water column in different directions. At the first day the maximum of the suspended matter in the discontinuity layer was in the north-western corner and in the bottom layer in the northeast corner of the dumping area. Strong wind conditions after the dumping led to periodical resuspension processes.