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Wireless sensor networks: An energy-aware adaptive modulation scheme

Wireless sensor networks: An energy-aware adaptive modulatio...

引用

conference on unmanned and unattended sensors and sensors networks

作者： Bravos, G Kanatas, AG Univ Piraeus Dept Technol Educ & Digital Syst GR-18534 Piraeus Greece

ISBN: (纸本)0819455644

Digital modulation schemes have been thoroughly examined over the last decades in order to improve the performance over wireless channels in terms of capacity or BER vs SNR. sensor networks belong to a special category of wireless networks where energy awareness may be more important than any other aspect such us bandwidth efficiency or Quality of Service. Hence, the criteria in order to choose the appropriate modulation scheme are quite different from any other application. In this paper we examine the available modulation schemes taking into account energy constraints, and based on an existing model, we propose an adaptive modulation scheme as a means to achieve better performance in terms of energy consumption.

关键词： sensor networks adaptive modulation schemes energy-aware networks

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Unique properties of solar blind ultraviolet communication systems for unattended ground sensor networks

Unique properties of solar blind ultraviolet communication s...

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conference on unmanned and unattended sensors and sensors networks

作者： Reilly, DM Moriarty, DT Maynard, JA BAE Systems North America (United States)

ISBN: (纸本)0819455644

Solar blind ultraviolet communication systems can provide short to medium range non line-of-sight and line-of-sight links which are covert and insensitive to meteorological conditions. Operation in the solar blind region provides zero background conditions and strong scattering interactions. Scattering provides the basis for transferring information when non line-of-sight conditions exist. Zero background conditions are a result of strong absorption of solar radiation in the upper atmosphere. These conditions make it possible to operate very sensitive wide field-of-view quantum noise limited photon counting receivers, and provide communication systems that perform very differently than free space optical systems that operate in other spectral regions. These systems may be compact and require very low primary power for operation. Non line-of-sight ultraviolet communication systems can provide reliable inter-nodal communications for unattended ground sensor networks. This type of system is particularly attractive when non line-of-sight conditions exist between nodes, covert operation is required, and insensitivity to positioning and ground proximity are desired. Light emitting diode technology being developed under the DARPA SUVOS program represents an enabling technology for these systems. Small, low power and low cost systems compatible with unattended ground sensor networks will be available as a result of this program. Data rates of hundreds of kbps with bit error rates (BER) of 10(-7) and inter-nodal ranges of hundreds of meters are consistent with phenomenology and technology. Line-of-sight ultraviolet communication systems also offer some unique characteristics for exfiltration of data from an unattended ground sensor network. The absence of background radiation makes it possible to operate with wide field-of-view receivers and large transmitter cone angles. This capability significantly reduces acquisition/pointing/tracking requirements that are traditionally

关键词： solar blind ultraviolet communications unattended ground sensors non line-of-sight communications ultraviolet light emitting diodes (UVLEDs) covert optical communications

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Modal Interference Fibre Optic sensor

Modal Interference Fibre Optic Sensor

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conference on unmanned and unattended sensors and sensors networks

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

ISBN: (纸本)0819455644

Modal Interference Fibre Optic sensor (MIFOS) for permanent monitoring of the network is presented. A mechanical disturbance of a fibre cable influences on intensity distribution at the end-face of a multimode fibre. Variations in interfering images are analysed by means of a digital processing unit that determines the alarm in case of unauthorised access along the whole length of the fibre. A contrast of an interference pattern and a procedure of fibre optic selection for the sensor are shown. A simple criterion that bases on changes of local maximums positions of the interference patterns is applied. A laboratory arrangement of the sensor and its experimental research are shown.

关键词： fibre optic sensor interference security data transfer

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Autonomous magnetic node for wireless sensor networks

Autonomous magnetic node for wireless sensor networks

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conference on unmanned and unattended sensors and sensors networks

作者： Dalichaouch, Y Shelby, R Trammell, H Mathis, K Quantum Magnet Inc San Diego CA 92128 USA

ISBN: (纸本)0819455644

Quantum Magnetics has developed an autonomous battery-powered magnetic sensor node for distributed wireless sensor networks. The device digitizes the sensor output signals and transmits data over an RF link using a ZigBee 802.15.4 protocol. The prototype node incorporates Magneto-Resistive (MR) chips configured to measure all three components of the magnetic field, a logic device, analog-to-digital converters, a two-axis tilt sensor, a wireless transceiver, and a set of batteries, For use in outdoor environments, the sensor node is also GPS-ready. At present, the unit measures approximately 4 inches on a side, with about 40% of the volume occupied by the batteries. Using battery power, the node can operate for about 10 hours in a continuous mode and up to 40 hours with a 10% duty cycle. Efforts are underway to develop the next-generation magnetic node with significant reduction in size and part count.

关键词： magnetic node magnetoresistive sensor wireless intrusion detection range

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Optimal topologies for wireless sensor networks

Optimal topologies for wireless sensor networks

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conference on unmanned and unattended sensors and sensors networks

作者： Tillett, J Yang, SJ Rao, R Sahin, F Rochester Inst Technol Rochester NY 14623 USA

ISBN: (纸本)0819455644

Since untethered sensor nodes operate on battery, and because they must communicate through a multi-hop network, it is vital to optimally configure the transmit power of the nodes both to conserve power and optimize spatial reuse of a shared channel. Current topology control algorithms try to minimize radio power while ensuring connectivity of the network. We propose that another important metric for a sensor network topology will involve consideration of hidden nodes and asymmetric links. Mnimizing the number of hidden nodes and asymmetric links at the expense of increasing the transmit power of a subset of the nodes may in fact increase the longevity of the sensor network. In this paper we explore a distributed evolutionary approach to optimizing this new metric. Inspiration from the Particle Swarm Optimization technique motivates a distributed version of the algorithm. We generate topologies with fewer hidden nodes and asymmetric links than a comparable algorithm and present some results that indicate that our topologies deliver more data and last longer.

关键词： particle swarm optimization topology control wireless sensor networks

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Defence applications of Disposable Organic sensor networks

Defence applications of Disposable Organic Sensor Networks

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conference on unmanned and unattended sensors and sensors networks

作者： Beale, DAR Hume, AL Hodges, RN Calloway, VP Kimber, SD QinetiQ Malvern WR14 3PS Worcs England

ISBN: (纸本)0819455644

The nature of many current Intelligence, Surveillance, Target Acquisition and Reconnaissance (ISTAR) sensor systems requires that they are controlled at an operational or strategic level. The trend towards asymmetric/urban warfare has created the necessity for tactical commanders;to be empowered with a similar ISTAR capability but over a reduced area. The variable temporal, spatial and cost constraints imposed by each scenario requires an adaptable organic sensory system to be developed to support the tactical commander. unmanned Disposable Organic sensor networks (DOSNs) are promising to provide sensory solutions in many tactical situations. However in order to develop a suitable DOSN it is necessary to identify the optimum realisation to meet the tactical commanders requirements. In this paper the work conducted by QinetiQ for elements of the UK MOD is discussed. This includes: 1) A method for assessing the value of each specific realisation of a DOSN against a range of scenarios. 2) Description of models used to generate an understanding of the capability of DOSN systems. 3) Description of an experimental DOSN system with associated trial results and plans to validate the models discussed above. The technical approach employed could also be used to assess the applicability of DOSN systems across a range of other military ISTAR requirements.

关键词： netted sensors UAV UGS disposable organic acoustic tactical

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Networked enabled sensors for the future soldier in urban warfare

Networked enabled sensors for the future soldier in urban wa...

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conference on unmanned and unattended sensors and sensors networks

作者： Edwards, C Robinson, C Thales Def Ltd Land & Joint Div Reading RG2 0SB Berks England

ISBN: (纸本)0819455644

In Urban Warfare the enemy is at close range;snipers are almost always present;stress is extremely high;and the opposing force is frequently indistinguishable from the civilian population. On-going events in the Middle East and the general rise in world-wide terrorism has shown that small cells of "terrorist" forces are able to inflict severe disproportional damage on conventional land forces (moral, attrition and political damage). This paper discusses the developments in Urban Warfare sensors and their possible role.

关键词： acoustic BIFF PIR MEMS network enabled seismic RGS RWS UGS UAV UGV and UWB

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Tactical unmanned aerial vehicle localization using ground-based acoustic sensors

Tactical unmanned aerial vehicle localization using ground-b...

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2004 Intelligent sensors, sensor networks and Information Processing conference, ISSNIP '04

作者： Lo, Kam W. Ferguson, Brian G. PO Box 44 Pyrmont NSW 2009 Australia

ISBN: (纸本)0780388933

Tactical unmanned aerial vehicles (TUAVs) are low observable aircraft that are susceptible to acoustic detection by unattended ground sensors because of the high levels of radiated noise generated by the propulsion mechanism (engine and propeller). This paper presents an acoustic signature analysis of a typical TUAV and demonstrates, using real data, the potential of both narrowband and broadband single-sensor based methods for estimating the flight parameters of a TUAV. Also, a broadband cross-correlation technique is applied to the sensor signals of a 3-element circular array to estimate the angular trajectory of a transiting TUAV. © 2004 IEEE.

关键词： unmanned vehicles

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Microsensors Systems: Detection of a dismounted threat

MicroSensors Systems: Detection of a dismounted threat

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conference on unmanned and unattended sensors and sensors networks

作者： Shimazu, R Berglund, V Falkofske, D Krantz, B Def Microelect Act Mcclellan CA 92652 USA

ISBN: (纸本)0819455644

The Microsensors Systems (MSS) Program is developing a layered sensor network to detect dismounted threats approaching high value assets. The MSS subsystem elements include sensitive receivers (capable of detecting << 1 Watt emissions in dense signal or degraded signal environments) and low power, miniature, disposable sensors (acoustic, magnetic, and infrared). A novel network protocol has been developed to reduce the network traffic resulting in conservation of system power and lower probability of detection and interception. The MSS program will provide unprecedented levels of real-time battlefield information, greatly enhancing combat situational awareness when integrated with the existing Command, Control, Communications, Computers, Intelligence, Surveillance and Reconnaissance (C4ISR) infrastructure. This system will provide an important boost to realizing the information dominant, network-centric objective of Joint Vision 2020. The program has established two Centers of Excellence for sensor Technology each of which is capable of designing and building next generation, networked microsensor systems. The Defense Microelectronics Activity has teamed with the Centers of Excellence and industry to preserve long-term Department of Defense access to key next generation manufacturing technologies.

关键词： microsensor sensor network wireless detector unattended military defense UGS dismount

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Monitoring of diffusion processes with PDE models in wireless sensor networks

Monitoring of diffusion processes with PDE models in wireles...

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conference on unattended/unmanned Ground, Ocean and Air sensor Technologies and Applications VI

作者： Rossi, LA Krishnamachari, B Kuo, CCJ Univ So Calif Dept Elect Engn Los Angeles CA 90089 USA

ISBN: (纸本)0819453404

The monitoring of a diffuse process, such as the propagation of a toxic gas in an area, using the partial differential equation (PED) model via autonomous wireless sensor networks is studied in this research. sensor nodes update the base station with their estimates of PDE model parameters rather than raw sensor measurements. Then, the base station can reconstruct the phenomenon through model parameters and initial and boundary conditions. In-network processing techniques to estimate the PDE coefficients are presented. A scheme is presented to provide a hybrid combination of decision and data fusion to find a proper tradeoff between estimate accuracy and energy efficiency. Besides, several open issues in this research context, such as identifiability of parameters, monitoring of time varying boundary conditions and unknown sources, are discussed.

关键词： sensors Diffusion sensor networks Data fusion Head Data modeling Filtering (signal processing) Process modeling Fusion energy Signal to noise ratio

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