SPIE Defense + Commercial Sensing最新文献_第9页

Unintended illumination for PMMW systems PMMW系统的意外照明

SPIE Defense + Commercial Sensing Pub Date : 2008-04-18 DOI: 10.1117/12.796411

A. Pergande

引用次数: 1

Wideband fractal antennas for holographic imaging and rectenna applications 用于全息成像和整流天线的宽带分形天线

SPIE Defense + Commercial Sensing Pub Date : 2008-04-18 DOI: 10.1117/12.778265

K. J. Bunch, D. McMakin, D. Sheen

{"title":"Wideband fractal antennas for holographic imaging and rectenna applications","authors":"K. J. Bunch, D. McMakin, D. Sheen","doi":"10.1117/12.778265","DOIUrl":"https://doi.org/10.1117/12.778265","url":null,"abstract":"At Pacific Northwest National Laboratory, wideband antenna arrays have been successfully used to reconstruct three-dimensional images at microwave and millimeter-wave frequencies. Applications of this technology have included portal monitoring, through-wall imaging, and weapons detection. Fractal antennas have been shown to have wideband characteristics due to their self-similar nature (that is, their geometry is replicated at different scales). They further have advantages in providing good characteristics in a compact configuration. We discuss the application of fractal antennas for holographic imaging. Simulation results will be presented. Rectennas are a specific class of antennas in which a received signal drives a nonlinear junction and is retransmitted at either a harmonic frequency or a demodulated frequency. Applications include tagging and tracking objects with a uniquely-responding antenna. It is of interest to consider fractal rectenna because the self-similarity of fractal antennas tends to make them have similar resonance behavior at multiples of the primary resonance. Thus, fractal antennas can be suited for applications in which a signal is reradiated at a harmonic frequency. Simulations will be discussed with this application in mind.","PeriodicalId":133868,"journal":{"name":"SPIE Defense + Commercial Sensing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131795352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The monitoring of critical infrastructures using microwave radiometers 利用微波辐射计对关键基础设施进行监测

SPIE Defense + Commercial Sensing Pub Date : 2008-04-18 DOI: 10.1117/12.777631

M. Peichl, S. Dill, M. Jirousek, H. Süß

引用次数: 9

Three dimensional imaging laser radar system for short-range target detection and identification 用于近距离目标探测与识别的三维成像激光雷达系统

SPIE Defense + Commercial Sensing Pub Date : 2008-04-18 DOI: 10.1117/12.777279

Ping Li, Kun Li, H. Chen, W. Gou

引用次数: 0

Rapid screening and species identification of E. coli, Listeria, and Salmonella by SERS technique 利用SERS技术快速筛选大肠杆菌、李斯特菌和沙门氏菌

SPIE Defense + Commercial Sensing Pub Date : 2008-04-18 DOI: 10.1117/12.786881

Yongliang Liu, K. Chao, M. Kim, X. Nou

引用次数: 2

Design, fabrication, and characterization of LiNbO3 optical modulator for high-sensitivity mmW imaging system 用于高灵敏度毫米波成像系统的LiNbO3光调制器的设计、制造和表征

SPIE Defense + Commercial Sensing Pub Date : 2008-04-18 DOI: 10.1117/12.777571

P. Yao, R. Shireen, J. Macario, C. Schuetz, S. Shi, D. Prather

引用次数: 3

FSO communications: atmospheric effects for an airborne backbone FSO通信:机载主干网的大气效应

SPIE Defense + Commercial Sensing Pub Date : 2008-04-18 DOI: 10.1117/12.785861

R. Phillips, L. Andrews

引用次数: 9

Automatic sensor management: challenges and solutions 自动传感器管理:挑战和解决方案

SPIE Defense + Commercial Sensing Pub Date : 2008-04-17 DOI: 10.1117/12.777607

Tanja Y. C. van Valkenburg-van Haarst, Wilbert van Norden, F. Bolderheij

引用次数: 11

An RSSI-based filter for mobility control of mobile wireless ad hoc-based unmanned ground vehicles 一种基于rssi的移动无线自组网无人地面车辆机动控制滤波器

SPIE Defense + Commercial Sensing Pub Date : 2008-04-17 DOI: 10.1117/12.776958

P. Wightman, D. Jabba, M. Labrador

{"title":"An RSSI-based filter for mobility control of mobile wireless ad hoc-based unmanned ground vehicles","authors":"P. Wightman, D. Jabba, M. Labrador","doi":"10.1117/12.776958","DOIUrl":"https://doi.org/10.1117/12.776958","url":null,"abstract":"The number of missions in which unmanned vehicles are required to work collaboratively is increasing. In these applications, maintaining continuous communication among the vehicles is crucial. Wireless Mobile Ad Hoc Networks are being used in swarming platforms of unmanned vehicles given the increased range of coverage and the extra reliability that they provide. However, autonomous navigation includes the possibility of vehicles going out of communication range, producing network partitions and hindering the mission's success. In this paper, a new algorithm is proposed that uses the Received Signal Strength (RSSI) to determine when the vehicle has to modify its mobility pattern to remain in contact with the rest of the group. The algorithm, implemented in a platform of unmanned ground vehicles, was tested in indoor and outdoor environments. The results show that the proposed algorithm can effectively filter out unexpected propagation effects and provide a smooth estimate of the signal strength that the vehicles can use to control their mobility and maintain their connectivity at all times. In addition, the algorithm is simple to implement and has low computational requirements.","PeriodicalId":133868,"journal":{"name":"SPIE Defense + Commercial Sensing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114604261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

An initial investigation into incorporating human reports into a road-constrained random set tracker 将人类报告纳入道路约束随机集跟踪器的初步调查

SPIE Defense + Commercial Sensing Pub Date : 2008-04-17 DOI: 10.1117/12.777142

D. W. Winters, James Witkoskie, W. Kuklinski

{"title":"An initial investigation into incorporating human reports into a road-constrained random set tracker","authors":"D. W. Winters, James Witkoskie, W. Kuklinski","doi":"10.1117/12.777142","DOIUrl":"https://doi.org/10.1117/12.777142","url":null,"abstract":"Road-constrained tracking of multiple targets poses a challenge for standard tracking algorithms due to possible target/road ambiguities. The random set approach accepts the existence of ambiguity and tracks the probability density associated with each target/road hypothesis. Measurements from multiple sensors are used to update these densities via random set analogues of the Bayesian filtering equations. Reports from humans have the potential to complement and augment data provided by sensors. A challenge with incorporating human reports is that the reports' vagueness and ambiguity lead to many possible interpretations. We propose a method for incorporating human reports into a road-constrained random set tracker (RST). Our proposed approach involves mapping a human report into multiple plausible precise measurements. These precise measurements are used to update the global density in a manner similar to the sensor measurement case. We validated our approach using a simulated road network scenario, consisting of multiple sensors and targets and a simple human observer model. The human observer's reports contained coarse information about the number and relative location of the targets within a field of view. These human reports are mapped to multiple groups of plausible measurements consisting of ranges and bearing angles with large errors. The performance of the RST with and without the human reports is compared. A quantitative metric indicates that the inclusion of the human reports increases the belief of the RST in the correct target/road hypothesis.","PeriodicalId":133868,"journal":{"name":"SPIE Defense + Commercial Sensing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129476668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0