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The use of composite fence with integrated sensors in security systems 11

The use of composite fence with integrated sensors in securi...

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conference on unmanned/unattended sensors and sensor networks XI;and Advanced Free-Space Optical Communication Techniques and Applications

作者： Szustakowski, M. Markowski, P. Ciurapinski, W. Zyczkowski, M. Karol, M. Mil Univ Technol Inst Optoelect PL-00908 Warsaw Poland

ISBN: (纸本)9781628418576

This paper presents possibilities of using the composite fence in the security systems. The fence made entirely of dielectric materials is neutral for electromagnetic waves. Thus, the fence does not introduce disturbances in propagation of electromagnetic waves. The use of composite fences reduces reflections of electromagnetic waves which cause negative effects on fence sensors, microwave barriers and radars. Additionally, the sensing part of the fence sensors can be integrated in the composite fence structure. Thus, the detecting elements mounted on the fence are invisible for potential intruder. This paper presents the composite fence with integrated fiber for fiber optic sensors. By arranging the fiber into fence grid it is possible not only discreet installation of the sensors, but also better transfer movements of the fence to sensitive optical fiber. By using the fiber as a sensing element the whole fence remain dielectric. Thereby obtaining a fence entirely transparent to electromagnetic waves which is also monitored for forcing attempts. Another way to use the dielectric properties of the composite fence is possibility of use electromagnetic sensors. Installation of the electromagnetic sensor directly on the fence allows to create a monitored zone in the close surroundings on both sides of the fence. The use of two types of sensors based on different physical phenomena provides an improvement in the detection properties of the entire security system by reducing the number of false alarms and increasing level of safety by increasing the probability of detection an attempt to force the fence.

关键词： perimeter protection security systems composite structures fiber optic sensors electromagnetic sensors

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Detection and tracking of drones using advanced acoustic cameras 11

Detection and tracking of drones using advanced acoustic cam...

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conference on unmanned/unattended sensors and sensor networks XI;and Advanced Free-Space Optical Communication Techniques and Applications

作者： Busset, Joel Perrodin, Florian Wellig, Peter Ott, Beat Heutschi, Kurt Ruehl, Torben Nussbaumer, Thomas Distran GmbH CH-8092 Zurich Switzerland Armasuisse Sci & Technol CH-3602 Thun Switzerland EMPA Swiss Fed Labs Mat Sci & Technol CH-8600 Dubendorf Switzerland RUAG CH-3602 Thun Switzerland

ISBN: (纸本)9781628418576

Recent events of drones flying over city centers, official buildings and nuclear installations stressed the growing threat of uncontrolled drone proliferation and the lack of real countermeasure. Indeed, detecting and tracking them can be difficult with traditional techniques. A system to acoustically detect and track small moving objects, such as drones or ground robots, using acoustic cameras is presented. The described sensor, is completely passive, and composed of a 120-element microphone array and a video camera. The acoustic imaging algorithm determines in real-time the sound power level coming from all directions, using the phase of the sound signals. A tracking algorithm is then able to follow the sound sources. Additionally, a beamforming algorithm selectively extracts the sound coming from each tracked sound source. This extracted sound signal can be used to identify sound signatures and determine the type of object. The described techniques can detect and track any object that produces noise (engines, propellers, tires, etc). It is a good complementary approach to more traditional techniques such as (i) optical and infrared cameras, for which the object may only represent few pixels and may be hidden by the blooming of a bright background, and (ii) radar or other echo-localization techniques, suffering from the weakness of the echo signal coming back to the sensor. The distance of detection depends on the type (frequency range) and volume of the noise emitted by the object, and on the background noise of the environment. Detection range and resilience to background noise were tested in both, laboratory environments and outdoor conditions. It was determined that drones can be tracked up to 160 to 250 meters, depending on their type. Speech extraction was also experimentally investigated: the speech signal of a person being 80 to 100 meters away can be captured with acceptable speech intelligibility.

关键词： Cameras Acoustics unmanned aerial vehicles Imaging systems Detection and tracking algorithms Phased arrays sensors Video Spherical lenses Clocks

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Urban Target Search and Tracking Using a UAV and unattended Ground sensors

Urban Target Search and Tracking Using a UAV and Unattended ...

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American Control conference

作者： J.-P. Ramirez-Paredes E. A. Doucette J. W. Curtis N. R. Gans Department of Electrical Engineering The University of Texas at Dallas Richardson TX 75080 USA Munitions Directorate Air Force Research Laboratory Eglin AFB USA

ISBN: (纸本)9781479917730

We present a framework to search for and track a target within an urban environment by fusing data from an unmanned Aerial Vehicle and unattended Ground sensors. The target and UAV are restricted to a road network modeled as a directed graph with the ground sensors deployed along selected edges. The UAV is equipped with an onboard camera capable of detecting the target, and it is guided by an information-theoretic planner that uses a particle filter estimate of the target state as its input. We introduce a method to process out-of-sequence measurements that exploits the time-sparseness of the UGS readings to reduce the computational complexity. Finally, we present simulation results on real road networks that show the target tracking performance and the gains in computation time of our approach.

关键词： unattended Ground sensor road network computational time tracking vehicle urban environment

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Encounter Detection to Improve Navigation in a Group of unattended Vehicles 10

Encounter Detection to Improve Navigation in a Group of Unat...

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conference on unmanned/unattended sensors and sensor networks X

作者： Ruizenaar, M. G. A. TNO Tech Sci The Hague Netherlands

ISBN: (纸本)9781628413113

Research was conducted on groups of unattended vehicles performing some collaborative tasks. Navigation of these vehicles and more specifically, knowing each other's position, is mandatory. In densely built environments, forests, etc., GPS is not always available or accurate. Using information about encounters between the vehicles may significantly improve position information. Detecting encounters can be done very easily with low cost sensors. TNO developed and patented an innovative technology that uses information on encounters to improve the position information. The first promising results show that information on encounters can be used in standard integrated INS/GNSS navigation systems to aid the navigation solution. To increase the number of encounters, a group of unattended vehicles may deliberately try to encounter each other if their navigation solution becomes less certain during GNSS outages.

关键词： Encounter Navigation unattended INS GNSS Kalman Unaided Proximity

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Implementing the Distributed Consensus-based Estimation of Environmental Variables in unattended Wireless sensor networks 10

Implementing the Distributed Consensus-based Estimation of E...

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conference on unmanned/unattended sensors and sensor networks X

作者： Contreras, Rodrigo Restrepo, Silvia Elena Pezoa, Jorge E. Univ Concepcion Dept Ingn Elect Concepcion Chile

ISBN: (纸本)9781628413113

In this paper, the prototype implementation of a scalable, distributed protocol for calculating the global average of sensed environmental variables in unattended wireless sensor networks (WSNs) is presented. The design and implementation of the protocol introduces a communication scheme for discovering the WSN topology. Such scheme uses a synchronous flooding algorithm, which was implemented over an unreliable radiogram-based wireless channel. The topology discovery protocol has been synchronized with sampling time of the WSN and must be executed before the consensus-based estimation of the global averages. An average consensus algorithm, suited for clustered WSNs with static topologies, was selected from the literature. The algorithm was properly modified so that its implementation guarantees that the convergence time is bounded and less than the sampling time of the WSN. Moreover, to implement the consensus algorithm, a reliable packet-passing protocol was designed to exchange the weighting factors among the sensor nodes. Since the amount of data exchanged in each packet is bounded by the degree of the WSN, the scalability of the protocol is guaranteed to be linear. The proposed protocol was implemented in the Sun SPOT hardware/software platform using the Java programming language. All the radio communications were implemented over the IEEE 802.15.4 standard and the sensed environmental variables corresponded to the temperature and luminosity.

关键词： wireless sensor networks consensus theory IEEE 802.15.4

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PADF Electromagnetic Source Localization Using Extremum Seeking Control 10

PADF Electromagnetic Source Localization Using Extremum Seek...

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conference on unmanned/unattended sensors and sensor networks X

作者： Al Issa, Huthaifa A. Ordonez, Raul Jerash Univ Fac Engn Dept Commun & Elect Engn POB 311 Jerash 26150 Jordan Univ Dayton Dept Elect & Comp Engn Dayton OH 45469 USA

ISBN: (纸本)9781628413113

Wireless sensor networks (WSNs) are a significant technology attracting considerable research interest. Recent advances in wireless communications and electronics have enabled the development of low-cost, low-power and multi-functional sensors that are small in size and communicate over short distances. Most WSN applications require knowing or measuring locations of thousands of sensors accurately. For example, sensing data without knowing the sensor location is often meaningless. Locations of sensor nodes are fundamental to providing location stamps, locating and tracking objects, forming clusters, and facilitating routing. This research focused on the modeling and implementation of distributed, mobile radar sensor networks. In particular, we worked on the problem of Position-Adaptive Direction Finding (PADF), to determine the location of a non- collaborative transmitter, possibly hidden within a structure, by using a team of cooperative intelligent sensor networks. Position-Adaptive radar concepts have been formulated and investigated at the Air Force Research Laboratory (AFRL) within the past few years. In this paper, we present the simulation performance analysis on the application aspect. We apply Extremum Seeking Control (ESC) schemes by using the swarm seeking problem, where the goal is to design a control law for each individual sensor that can minimize the error metric by adapting the sensor positions in real-time, thereby minimizing the unknown estimation error. As a result we achieved source seeking and collision avoidance of the entire group of the sensor positions.

关键词： Extremum seeking control swarm source seeking position-adaptive direction finding localization wireless ad-hoc networks unmanned aerial vehicles

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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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