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检索条件"任意字段=Conference on Unmanned/Unattended Sensors and Sensor Networks IV"

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Simple fiber optic sensor for applications in security systems 10

Simple fiber optic sensor for applications in security syste...

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conference on unmanned/unattended sensors and sensor networks X

作者： Zyczkowski, M. Karol, M. Markowski, P. Napierala, M. S. Mil Univ Technol Inst Optoelect PL-00908 Warsaw Poland

ISBN: (纸本)9781628413113

In this paper we demonstrate measurement results of the modalmetric fiber optic sensor used for the monitoring of the fiber optic link integrity to protect it against unauthorized access to classified information. The presented construction is based on the detection of changes of the modes distribution in a multimode fiber. Any mechanical stress on the multimode fiber causes changes of polarization and distribution of propagating modes, hence it changes the distribution of modes at the end of the multimode fiber. Observation of these changes using a narrow core single-mode fiber allows to use the structure as an optical fiber sensor. We used several kilometers long optical links to conduct field tests of laboratory sensor. On this basis the prototype module of modalmetric fiber optic sensor wasbuilt. The modification of optoelectronic part, the variation of sensor length and the change of the method of light reflection at the end of the fiber enable the use of the modalmetric fiber optic sensor in many applications. The sensor finds wide range of applications in security systems. It can be applied to protect the museum's collection, transmission lines and to protect objects of critical infrastructure.

关键词： fiber optic sensor security system

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Bi-material resonant infrared thermal detector and array 10

Bi-material resonant infrared thermal detector and array

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conference on unmanned/unattended sensors and sensor networks X

作者： Zhang, Xia Zhang, Dacheng Commun Univ China Dept Photo Elect Beijing 100024 Peoples R China Peking Univ BInstitute Microelectron Beijing 100871 Peoples R China

ISBN: (纸本)9781628413113

A resonant infrared thermal sensor with high sensitivity, whose sensing element is a bi-material structure with thermal expansion mismatch effect, is presented in this paper. The sensor detects infrared radiation by means of tracking the change in resonance frequency of the bi-material structure with temperature change attributed to the infrared radiation from targets. The bi-material structure can amplify the change in resonance frequency compared to a single material sensing structure. In accordance with the theory of vibration mechanics and design principle of infrared thermal detector, the bi-material resonant sensor by means of which an array can be achieved is designed. The simulation results, by ANSYS software analysis based on multi-layer shell finite element, demonstrate that the dependence of resonance frequency on temperature of the designed sensing structure achieves 1Hz/0.01 degrees C. A microarray with 6x6 resonant infrared sensors is fabricated based on microelectronics processes being compatible with integrated circuit fabrication technology. The frequency variation corresponding to the temperature shift can be obtained by electrical measurement.

关键词： Bi-material mismatch in thermal expansion resonance infrared thermal sensor microarray

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Improvement of optical and acoustical technologies for the protection: Project IMOTEP. Network of heterogeneous sensor types for the protection of camps or mobile troops 10

Improvement of optical and acoustical technologies for the p...

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conference on unmanned/unattended sensors and sensor networks X

作者： Hengy, Sebastien Laurenzis, Martin Zimpfer, Veronique Schneider, Armin French German Res Inst St Louis F-68301 St Louis France

ISBN: (纸本)9781628413113

Snipers have emerged as a major threat to troops in recent conflicts. To reduce this menace, the objective of the French-German Research Institute of Saint Louis (ISL) research project "IMOTEP" is to improve the detection of snipers on the battlefield. Our basic approach is to combine several sources of information for a fast and appropriate reaction when an unusual signal (e.g. a flash or a shot) is detected. The project includes several technologies developed at ISL: acoustical detection, fusion of distributed sensor network data, active imaging and 3D audio communication. The protection of camps, convoys or dismounted soldiers rests on a distributed acoustical sensor network that detects and localizes sniper attacks. An early estimation of the threat position is transmitted through a network to an active imaging system in order to confirm and refine this position by 3D imaging. The refined position is then sent to the control center which generates an alert message that displays the threat position using two formats: a tactical map and a 3D audio signal. In addition, the camp is protected by an ad-hoc sensor network used for intruder detection.

关键词： acoustical detection distributed sensors active imaging 3D audio communication

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DAZZLE project: UAV to ground communication system using a laser and a modulated retro-reflector 10

DAZZLE project: UAV to ground communication system using a l...

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conference on unmanned/unattended sensors and sensor networks X

作者： Thueux, Yoann Avlonitis, Nicholas Erry, Gavin Airbus Grp Innovat Newport Gwent Wales

ISBN: (纸本)9781628413113

The advent of the unmanned Aerial Vehicle (UAV) has generated the need for reduced size, weight and power (SWaP) requirements for communications systems with a high data rate, enhanced security and quality of service. This paper presents the current results of the DAZZLE project run by Airbus Group Innovations. The specifications, integration steps and initial performance of a UAV to ground communication system using a laser and a modulated retro-reflector are detailed. The laser operates at the wavelength of 1550nm and at power levels that keep it eye safe. It is directed using a FLIR pan and tilt unit driven by an image processing-based system that tracks the UAV in flight at a range of a few kilometers. The modulated retro-reflector is capable of a data rate of 20Mbps over short distances, using 200mW of electrical power. The communication system was tested at the Pershore Laser Range in July 2014. Video data from a flying Octocopter was successfully transmitted over 1200m. During the next phase of the DAZZLE project, the team will attempt to produce a modulated retro-reflector capable of 1Gbps in partnership with the research institute Acreo(1) based in Sweden. A high speed laser beam steering capability based on a Spatial Light Modulator will also be added to the system to improve beam pointing accuracy.

关键词： unmanned aerial vehicle octocopter modulated retro reflector laser communications spatial light modulator

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Adaptive multi-sensor biomimetics for unsupervised submarine hunt (AMBUSH): Early results 10

Adaptive multi-sensor biomimetics for unsupervised submarine...

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conference on unmanned/unattended sensors and sensor networks X

作者： Blouin, Stephane Def R&D Canada Atlantic Res Ctr Dartmouth NS Canada

ISBN: (纸本)9781628413113

Underwater surveillance is inherently difficult because acoustic wave propagation and transmission arc limited and unpredictable when targets and sensors move around in the communication-opaque undersea environment. Today's Navy underwater sensors enable the collechon of a massive amount of data, often analyzed offline. The Navy of tomorrow will dominate by making sense of that data in real-time, DRDCS AMBUSH project proposes a new undersea surveillance network paradigm that will enable such a real-time operation, Nature abounds with examples of collaborative tasks taking place despite limited communication and computational capabilities. This publication describes a year's worth of research efforts finding inspiration in Nature's collaborative tasks such as wolves hunting in packs. This project proposes the utilization of a he network combining both static and mobile network nodes. The military objective is to enable an unsupervised surveillance capability while maximizing target localization performance and endurance. The scientific objective is to develop the necessary technology to acoustically and passively localize a noise-source of interest in shallow waters, The project fulfills these objectives via distributed computing and adaptation to charging undersea conditions. Specific research interests discussed here relate to approaches for performing: (a) network self-discovery, (b) network connectivity self assessment, (c) opportunistic network routing, (d) distributed data-aggregation, and (c) simulation of underwater acoustic propagation, We present early results then followed by a discussion about future work.

关键词： Underwater surveillance sensor network distributed computing. adaptation

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Aerial Networking Communication solutions using Micro Air Vehicle (MAV) 10

Aerial Networking Communication solutions using Micro Air Ve...

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conference on unmanned/unattended sensors and sensor networks X

作者： Balasubramanian, Shyam de Graaf, Maurits Hoekstra, Gerard Corporaal, Henk Wijtvliet, Mark Linde, Javier Cuadros Thales Nederland BV Bestevaer 46 NL-1271 ZA Huizen Netherlands Techn Univ Eindhoven NL-5612 AZ Eindhoven Netherlands

ISBN: (纸本)9781628413113

The application of a Micro Air Vehicle (MAV) for wireless networking is slowly gaining significance in the field of network robotics. Aerial transport of data requires efficient network protocols along with accurate positional adjustment of the MAV to minimize transaction times. In our proof of concept, we develop an Aerial networking protocol for data transfer using the technology of Disruption Tolerant networks (DTN), a store-and-forward approach for environments that deals with disrupted connectivity. Our results show that close interaction between networking and flight behavior helps in efficient data exchange. Potential applications are in areas where network infrastructure is minimal or unavailable and distances may be large. For example, forwarding video recordings during search and rescue, agriculture, swarm communication, among several others. A practical implementation and validation, as described in this paper, presents the complex dynamics of wireless environments and poses new challenges that are not addressed in earlier work on this topic. Several tests are evaluated in a practical setup to display the networking MAV behavior during such an operation.

关键词： Disruption Tolerant Networking (DTN) Mobile Ad-Hoc networks (MANET) Micro-Aerial Vehicles (MAV) aerial vehicle or multirotor

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Channel Modelling for Free-Space Optical Inter-HAP Links Using Adaptive ARQ Transmission 10

Channel Modelling for Free-Space Optical Inter-HAP Links Usi...

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conference on unmanned/unattended sensors and sensor networks X

作者： Parthasarathy, S. Giggenbach, D. Kirstaedter, A. German Aerosp Ctr DLR Inst Commun & Nav D-82234 Wessling Germany Univ Stuttgart Inst Commun Networks & Comp Engn D-70569 Stuttgart Germany

ISBN: (纸本)9781628413113

Free-space optical (FSO) communication systems have seen significant developments in recent years due to growing need for very high data rates and tap-proof communication. The operation of an FSO link is suited to diverse variety of applications such as satellites, High Altitude Platforms (HAPs), unmanned Aerial Vehicles (UAVs), aircrafts, ground stations and other areas involving both civil and military situations. FSO communication systems face challenges due to different effects of the atmospheric channel. FSO channel primarily suffers from scintillation effects due to Index of Refraction Turbulence (IRT). In addition, acquisition and pointing becomes more difficult because of the high directivity of the transmitted beam: Miss-pointing of the transmitted beam and tracking errors at the receiver generate additional fading of the optical signal. High Altitude Platforms (HAPs) are quasi-stationary vehicles operating in the stratosphere. The slowly varying but precisely determined time-of-flight of the Inter-HAP channel adds to its characteristics. To propose a suitable ARQ scheme, proper theoretical understanding of the optical atmospheric propagation and modeling of a specific scenario FSO channel is required. In this paper, a bi-directional symmetrical Inter-HAP link has been selected and modeled. The Inter-HAP channel model is then investigated via simulations in terms of optical scintillation induced by IRT and in presence of pointing error. The performance characteristic of the model is then quantified in terms of fading statistics from which the Packet Error Probability (PEP) is calculated. Based on the PEP characteristics, we propose suitable ARQ schemes.

关键词： FSO Index of Refraction Turbulence Scintillation Pointing Error Bit Error Probability Packet Error Probability Transmission Efficiency Error Detection and Correction

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An Object-Oriented Modeling and Simulation Framework for Bearings-Only Multi-Target Tracking using an unattended Acoustic sensor Network

An Object-Oriented Modeling and Simulation Framework for Bea...

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conference on Emerging Technologies in Security and Defence;and Quantum Security II;and unmanned sensor Systems X

作者： Aslan, Murat Samil Tubitak Bilgem Iltaren Adv Technol Res Inst TR-06800 Ankara Turkey

ISBN: (纸本)9780819497680

Tracking ground targets using low cost ground-based sensors is a challenging field because of the limited capabilities of such sensors. Among the several candidates, including seismic and magnetic sensors, the acoustic sensors based on microphone arrays have a potential of being useful: They can provide a direction to the sound source, they can have a relatively better range, and the sound characteristics can provide a basis for target classification. However, there are still many problems. One of them is the difficulty to resolve multiple sound sources, another is that they do not provide distance, a third is the presence of background noise from wind, sea, rain, distant air and land traffic, people, etc., and a fourth is that the same target can sound very differently depending on factors like terrain type, topography, speed, gear, distance, etc. Use of sophisticated signal processing and data fusion algorithms is the key for compensating (to an extend) the limited capabilities and mentioned problems of these sensors. It is hard, if not impossible, to evaluate the performance of such complex algorithms analytically. For an effective evaluation, before performing expensive field trials, well-designed laboratory experiments and computer simulations are necessary. Along this line, in this paper, we present an object-oriented modeling and simulation framework which can be used to generate simulated data for the data fusion algorithms for tracking multiple on-road targets in an unattended acoustic sensor network. Each sensor node in the network is a circular microphone array which produces the direction of arrival (DOA) (or bearing) measurements of the targets and sends this information to a fusion center. We present the models for road networks, targets (motion and acoustic power) and acoustic sensors in an object-oriented fashion where different and possibly time-varying sampling periods for each sensor node is possible. Moreover, the sensor's signal processing and d

关键词： Ground target tracking acoustic sensor network bearings-only multiple target tracking road network modeling receiver operating characteristic (ROC) curve unattended ground sensor (UGS) network direction of arrival (DOA) estimation object-oriented programming

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Acoustic Network Event Classification Using Swarm Optimization

Acoustic Network Event Classification Using Swarm Optimizati...

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conference on Ground/Air Multisensor Interoperability, Integration, and Networking for Persistent ISR iv

作者： Burman, Jerry Intelligent Recognit Syst Inc Westlake Village CA 91362 USA

ISBN: (纸本)9780819495334

Classifying acoustic signals detected by distributed sensor networks is a difficult problem due to the wide variations that can occur in the transmission of terrestrial, subterranean, seismic and aerial events. An acoustic event classifier was developed that uses particle swarm optimization to perform a flexible time correlation of a sensed acoustic signature to reference data. In order to mitigate the effects from interference such as multipath, the classifier fuses signatures from multiple sensors to form a composite sensed acoustic signature and then automatically matches the composite signature with reference data. The approach can classify all types of acoustic events but is particularly well suited to explosive events such as gun shots, mortar blasts and improvised explosive devices that produce an acoustic signature having a shock wave component that is aperiodic and non-linear. The classifier was applied to field data and yielded excellent results in terms of reconstructing degraded acoustic signatures from multiple sensors and in classifying disparate acoustic events.

关键词： Acoustic sensors unattended Ground sensor networks Data Exfiltration Source Localization Acoustic Event Classification Swarm Optimization sensor Network Fabric and Acoustic Phenomenology

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Modelling systems of weakly characterised sensors

Modelling systems of weakly characterised sensors

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conference on unmanned/unattended sensors and sensor networks IX

作者： Willis, Chris J. BAE SYST Adv Technol Ctr Chelmsford CM2 8HN Essex England

ISBN: (纸本)9780819492814

The modelling of the Automatic Target Detection, Recognition and Identification performance in systems of multiple sensors and/or platforms is important in several respects. For example, in the selection of sensors or sensor combinations of sufficient performance to achieve operational requirements or;for understanding how the system might be best exploited. To this end a simulation framework has been developed examining sensor options across different sensor types, parameterisations, search strategies, and applications. It uses Bayesian Decision Theoretic principles, along with simple sensor models and Monte-Carlo simulation, to derive the expected performance of single deployed sensors and of sensor combinations. The basic framework has been significantly extended to include recognition and identification problems along with the detection problem for which it was originally designed. The framework has also been expanded to treat cases in which the sensors are poorly characterised, and recommendations for parameterisation in this mode are made. The sensor system modelling framework has been applied to a number of illustrative problems. These range from simple target detection problems using sensors of differing performance or of different regional search schemes, through to examinations of: the number of measurements required to reach threshold performance;the effects of sensor measurement cost;issues relating to the poor characterisation of sensors within the system, and;the performance of a more elaborate combined detection and recognition sensor system. Generally, these results tend to show that the method is able to quantify qualitative expectations of performance, and is sufficiently powerful to highlight some unexpected aspects of operation.

关键词： performance modelling surveillance/reconnaissance ISTAR target detection/recognition/identification sensor management sensor system Monte-Carlo simulation weak characterisation

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