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Fibre optic perimeter protection sensor with intruder localization

Fibre optic perimeter protection sensor with intruder locali...

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conference on unmanned and unattended sensors and sensors networks

作者： Zyczkowski, M Szustakowski, N Palka, N Kondrat, M Mil Univ Technol Inst Optoelect PL-00908 Warsaw Poland

ISBN: (纸本)0819455644

This paper presents investigation results of a new generation of the fibre optic perimeter sensor in a two Sagnac interferometers configuration. This system can detect a potential intruder and determine its position along a protected zone. A multiresolution wavelet analyses of the signal is used to determine its start point. First, we made use of decomposition, thresholding and reconstruction of the signal by means of a Daubechies wavelet. Consequently, high-frequency noise was removed from the signal. Next, the signal was exposed to an approximation process by means of a multiresolution Haar wavelet. Statistical analysis of this signal enabled us to determine an amplitude criterion for calculation of a start point for slowly-changeable signals. The criterion was a standard deviation of the amplitude increase of the signal after approximation. Arrangement of a laboratory model of the sensor and its signal processing scheme is presented. During research of a laboratory model, it was possible to detect the position of the disturbance with resolution of about 20 in along a 6-km long section.

关键词： fibre optic sensor Sagnac interferometer signal processing localization

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Lab testing of new seismic sensor for defense and security applications

Lab testing of new seismic sensor for defense and security a...

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conference on unmanned and unattended sensors and sensors networks

作者： Pakhomov, A Sicignano, A Goldburt, T Gen Sensing Syst LLC Ardsley NY 10502 USA

ISBN: (纸本)0819455644

General Sensing Systems (GSS) has developed a sensor based on electret material. Herein we describe the creation and lab testing of this very small and high performance seismic sensor intended for up-to-date security and military systems. This article delivers the first results of laboratory tests of this small size and extremely low cost new sensor. This new sensor was compared with the most popular geophones, the GS-14-L3 and GS-20DX geophones produced by Geo Space Corporation. The results show that the new, GSS sensor has an expanding frequency response range in both the low and high frequency areas. This is crucial for increased detection range of seismic-acoustic and hydro acoustic reconnaissance systems. The new, GSS sensor also has the highest sensitivity among all the compared geophones as well as a lower sensitivity threshold. When the amplitude of vibrations is very small, the GS-14-L3 and GS-20DX geophones, for example, miss signals-whereas the new sensor has a good response. Specifically, this performance characteristic of the new GSS sensor also allows the development of reconnaissance systems with a high detection range. Test results also show that the new sensor demonstrates good signal discrimination, ensuring efficient signal interpretation. In general, the results reported here show that the use of electret materials enables the manufacture of very small and inexpensive seismic-acoustic and hydro acoustic sensors with improved performance characteristics.

关键词： seismic-acoustic sensors electret-based devices

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A sensor array is the solution to the CBRNE problem

A sensor array is the solution to the CBRNE problem

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conference on unmanned and unattended sensors and sensors networks

作者： Swaby, J USAF Inst Operat Hlth Brooks City Base TX 78235 USA

ISBN: (纸本)0819455644

Chemical/Biological/Radiological/Nuclear/Explosives (CBRNE) is a threat to all forces that deploy to any part of the globe. Lightweight expeditionary forces are especially vulnerable because they operate with minimum force structure in or near enemy forces and may become indirect targets due to the proximity of opposing forces. There is currently no integrated tactical, agile CBRNE detect-to-warn and detect-to-treat detection system suitable for lightweight expeditionary forces. The current solutions are often outside the deployment and support constraints of expeditionary forces. Expeditionary forces, typically, require a 30-day capability without re-supply and must maximize resources. Situational awareness is limited with little or no automation. Due to the limitations in existing detectors, no detector has been found to be the magic bullet for all types of agents. An array of sensors that are redundant and overlap the capabilities of each and the limitations of each technology, on the other hand, would provide a level of security that is progressively more acceptable to the warfighter. Intially, the array will be composed of integrated commercial-off-the-shelf (COTS) and government-off-the-shelf (GOTS) CBRNE samplers, identification devices, tamper sensors, and communications and alert equipment. The sensor array will plug-and-play new technologies as they become available.

关键词： sensor array expeditionary forces cyclic development

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Optical bistable devices as sensing elements

Optical bistable devices as sensing elements

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conference on unmanned and unattended sensors and sensors networks

作者： Gonzalez-Marcos, AP Hurtado, A Martin-Pereda, JA Univ Politecn Madrid ETS Ingenieros Telecomunicac E-28040 Madrid Spain

ISBN: (纸本)0819455644

The nonlinear optical properties of many materials and devices have been the main object of research as potential candidates for sensing in different places. Just one of these properties has been, in most of the cases, the basis for the sensing operation. As a consequence, just one parameter can be detected. In this paper, although just one property will be employed too, we will show the possibility to sense different parameters with just one type of sensor. The way adopted in this work is the use of the optical bistability obtained from different photonic structures. Because this optical bistability has a strong dependence on many different parameters the possibility to sense different inputs appears. In our case, we will report the use of some non-linear optical devices, mainly Semiconductor Optical Amplifiers, as sensing elements. Because their outputs depend on many parameters, as the incident light wavelength, polarization, intensity and direction, applied voltage and feedback characteristics, they can be employed to detect, at the same time, different type of signals. This is because the way these different signals affect to the sensor response is very different too and appears under a different set of characteristics.

关键词： optical sensor DFB laser diode sensor FP laser diode sensor

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Minimum Description Length segmentation adapted to different image sensors

Minimum Description Length segmentation adapted to different...

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conference on unmanned and unattended sensors and sensors networks

作者： Réfrégier, P Galland, F Martin, P Delyon, G Bertaux, N Goudail, F Ecol Generaliste Ingenieurs Marseille Fresnel Inst Phys & Image Proc Grp UMR 6133 F-13397 Marseille 20 France

ISBN: (纸本)0819455644

Determining the shape of one or several objects in an image is a fundamental task for many imaging systems. We propose here a general review of new techniques based on the information theory principles which allow one to determine segmentation techniques without parameter to be tuned by the user. These techniques are quite general since they include, polygonal and spline parametric shape descriptions, level set models of contour and homogenous partition of images. This approach can take into account the physical nature of the grey level fluctuations and is thus adapted to different new imaging systems. Furthermore, it can lead to fast algorithms (from a few hundred of ms to a few seconds depending on the complexity of the task to perform on 256 x 256 pixel images).

关键词： image segmentation statistical models information theory Minimum Description Length active contours

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unattended motion detection system based on the mammalian retina

Unattended motion detection system based on the mammalian re...

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conference on unmanned and unattended sensors and sensors networks

作者： Martin-Pereda, JA Gonzalez-Marcos, AP Univ Politecn Madrid ETS Ingenieros Telcomunicac E-28040 Madrid Spain

ISBN: (纸本)0819455644

Sensing systems in living bodies offer a large variety of possible different configurations and philosophies able to be emulated in artificial sensing systems. Motion detection is one of the areas where different animals adopt different solutions and, in most of the cases, these solutions reflect a very sophisticated form. One of them, the mammalian visual system, presents several advantages with respect to the artificial ones. The main objective of this paper is to present a system, based on this biological structure, able to detect motion, its sense and its characteristics. The configuration adopted responds to the internal structure of the mammalian retina, where just five types of cells arranged in five layers are able to differentiate a large number of characteristics of the image impinging onto it. Its main advantage is that the detection of these properties is based purely on its hardware. A simple unit, based in a previous optical logic cell employed in optical computing, is the basis for emulating the different behaviours of the biological neurons. No software is present and, in this way, no possible interference from outside affects to the final behaviour. This type of structure is able to work, once the internal configuration is implemented, without any further attention. Different possibilities are present in the architecture to be presented: detection of motion, of its direction and intensity. Moreover, some other characteristics, as symmetry may be obtained.

关键词： mammalian visual cortex retina image processing motion detection

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Calibration techniques for object tracking using a compound eye image sensor

Calibration techniques for object tracking using a compound ...

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conference on unmanned and unattended sensors and sensors networks

作者： Krishnasamy, R Thomas, P Pepic, S Wong, W Hornsey, R York Univ Dept Comp Sci N York ON M3J 1P3 Canada

ISBN: (纸本)0819455644

Vanishing point and Z-tranform image center calibration techniques are reported for a prototype "compound-eye" camera system which can contain up to 25 "eyelets". One application of this system is to track a fast-moving object, such as a tennis ball, over a wide field of view. Each eyelet comprises a coherent fiber bundle with a small imaging lens at one end. The other ends of the fiber bundles are aligned on a plane, which is re-imaged onto a commercial CMOS camera. The design and implementation of the Dragonfleye prototype is briefly described. Calibration of the image centers of the eyelet lenses is performed using a vanishing point technique, achieving an error of approximately +/-0.2 pixels. An alternative technique, the Z-transform, is shown to be able to achieve similar results. By restricting the application to a two-dimensional surface, it is shown that similar accuracies can be achieved using a simple homography transformation without the need for calibrating individual eyelets. Preliminary results for object tracking between eyelets are presented, showing an error between actual and measured positions of around 3.5 mrad.

关键词： image center compound eye calibration vanishing point object tracking

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Source localization using widely separated special microphone arrays: Study of the applicability of higher order statistics

Source localization using widely separated special microphon...

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conference on unmanned and unattended sensors and sensors networks

作者： Hengy, S Naz, P Gounon, P French German Res Inst St Louis ISL F-68301 St Louis France

ISBN: (纸本)0819455644

This paper presents an application implying higher order statistics in source localization. Such techniques have been first introduced in the early 1990's. Some interesting properties of higher order statistics are exploited in zone survey applications. A large global array constituted by a set of moving sub-arrays (soldiers wearing a Head Equipment (HE) equipped with one or more microphones, a GPS receiver and a magnetometer) allows the localization of the menaces near a survey zone. Studying a large global array, with second order statistics high resolution localization techniques, the local informations are not significant enough in order to have an influence on the estimation of the position of the acoustic sources (for instance, the orientation of the HE has no influence on the estimation of the position of the sources). We expect that the use of higher order statistics and their properties concerning especially the virtual equivalent network (VEN) will improve the significance of these local information and thus, allow to have a better estimation of the source position. A first study has been based on simulations, and then, some results with real data, collected in october 2003, are presented.

关键词： moving network of acoustic sensors special Head Equipment high resolution localization higher order statistics virtual equivalent network (VEN)

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sensors' network and its application in the intelligent storage security

Sensors' network and its application in the intelligent stor...

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conference on unmanned and unattended sensors and sensors networks

作者： Zhang, QY Nicolescu, M Jiang, X Zhang, Y Yue, WH Xiao, WH Wuhan Univ Technol Coll Logist Engn Wuhan 430063 Peoples R China

ISBN: (纸本)0819455644

Intelligent storage systems run on different advanced technologies, such as linear layout, business intelligence and data mining. Security, the basic desire of the storage system, has been focused on with the indraught of multimedia communication technology and sensors' network. Along with the developing of science and the social demands, multifarious alarming system has been designed and improved to be intelligentized, modularized and have network connections. It is of great moment to make the storage, and further more, the logistics system more and more efficient and perfect, with modem science and technology. Diversified information on the spot should be caught by different kinds of sensors. Those signals are treated and communicated to the control center to give the further actions. For fire-proofing, broad-spectrum gas sensors, fume sensors, flame sensors and temperature sensors are used to catch the information in their own ways. Once the fire is taken somewhere, the sensors work by the fume, temperature, and flame as well as gas immediately. Meanwhile the intelligent control system starts. It passes the tidings to the center unit. At the same time, it sets those movable walls on to work quickly to obstruct the fire's spreading. While for guarding the warehouse against theft, cut-off sensors, body sensors, photoelectric sensors, microwave sensors and closed-circuit television as well as electronic clocks are available to monitor the warehouse reasonably. All of those sensors work in a net way. The intelligent control system is made with a digital circuit instead of traditional switch one. This system can work in a better way in many cases. Its reliability is high and the cost is low.

关键词： intelligent storage systems security fire-proof network

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Defending networks against denial of service attacks

Defending networks against denial of service attacks

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conference on unmanned and unattended sensors and sensors networks

作者： Gelenbe, E Gellman, M Loukas, G Univ London Imperial Coll Sci Technol & Med Dept Elect & Elect Engn London SW7 2AZ England

ISBN: (纸本)0819455644

Denial of service attacks, viruses and worms are common tools for malicious adversarial behaviour in networks. Experience shows that over the last few years several of these techniques have probably been used by governments to impair the Internet communications of various entities, and we can expect that these and other information warfare tools will be used increasingly as part of hostile behaviour either independently, or in conjunction with other forms of attack in conventional or asymmetric warfare, as well as in other forms of malicious behaviour. In this paper we concentrate on Distributed Denial of Service Attacks (DDoS) where one or more attackers generate flooding traffic and direct it from multiple sources towards a set of selected nodes or IP addresses in the Internet. We first briefly survey the literature on the subject, and discuss some examples of DDoS incidents. We then present a technique that can be used for DDoS protection based on creating islands of protection around a critical information infrastructure. This technique, that we call the CPN-DoS-DT (Cognitive Packet networks DoS Defence Technique), creates a self-monitoring sub-network surrounding each critical infrastructure node. CPN-DoS-DT is triggered by a DDoS detection scheme, and generates control traffic from the objects of the DDoS attack to the islands of protection where DDOS packet flows are destroyed before they reach the critical infrastructure. We use mathematical modelling, simulation and experiments on our test-bed to show the positive and negative outcomes that may result from both the attack, and the CPN-DoS-DT protection mechanism, due to imperfect detection and false alarms.

关键词： information warfare Internet packet networks denial of service Cognitive Packet networks

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