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

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Remote detection of riverine traffic using an ad hoc wireless sensor network

Remote detection of riverine traffic using an ad hoc wireles...

引用

conference on unattended Ground sensor Technologies and Applications vii

作者： Athan, SP Custom Mfg & Engn Inc St Petersburg FL USA

ISBN: (纸本)0819457817

Trafficking of illegal drugs on riverine and inland waterways continues to proliferate in South America. While there has been a successful joint effort to cut off overland and air trafficking routes, there exists a vast river network and Amazon region consisting of over 13,000 water miles that remains difficult to adequately monitor, increasing the likelihood of narcotics moving along this extensive river system. Hence, an effort is underway to provide remote unattended riverine detection in lieu of manned or attended detection measures.

关键词： sensors Target detection sensor networks Telecommunications Satellite communications Satellites Radar unattended sensors Data fusion Wireless communications

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Sequential collaborative processing for energy efficiency and fault tolerance in unattended ground sensor networks

Sequential collaborative processing for energy efficiency an...

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conference on unattended Ground sensor Technologies and Applications vii

作者： Wang, XL Qi, HR Univ Tennessee Knoxville TN 37996 USA

ISBN: (纸本)0819457817

Multiple target detection in sensor networks is a. challenging problem since the signal captured by individual sensor nodes is normally a linear/nonlinear weighted mixture of geometrically diverse source signals. Independent component analysis (ICA) has been widely used to solve the source estimation problem, but most of the algorithms assume the number of sources is fixed and is equal to the number of observations, which generally is not the case in sensor networks. Even though several methods are put forward for source number estimation, traditional centralized schemes hinder their application in sensor networks due to extremely constrained resource and scalability issues. In this paper, a sequential source number estimation framework is developed, where we assume the sensor network has been self-organized into clusters. The determination of possible number of targets at a sensor is only based on its local observation and the estimation result received from its previous sensor. Therefore, raw data transmission is avoided and only small packets of partial estimation results are transmitted through the networks. Based on the local estimation generated within each cluster, a posterior probability fusion method based on the Bayes' theorem is derived. Experimental results show that using the sequential processing approach with probability fusion, the detection probability and reliability are improved over the centralized scheme while significantly reducing network traffic and conserving resources.

关键词： sensors sensor networks Target detection Signal detection unattended ground sensors Detection and tracking algorithms Error analysis Independent component analysis Fusion energy Signal processing

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Geolocation of wireless sensors with nonuniform GPS availability

Geolocation of wireless sensors with nonuniform GPS availabi...

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conference on unattended Ground sensor Technologies and Applications vii

作者： Wilden, J Agniel, J Moses, R Nova Syst Solut W Chester OH 45069 USA

ISBN: (纸本)0819457817

In order for the information provided by networks of unattended ground sensors (UGS) to be of use to the tactical planner, the location of each sensor must often be known. sensor localization is typically achieved by careful hand emplacement, or facilitated by anchor nodes whose position is precisely known. Nova Engineering and Army Research Laboratory are currently designing a new sensor network architecture to meet the growing need for UGS networks that can self-localize using anchor nodes with imprecise prior location information. In this paper we present an overview of a prototype sensor network and an analysis of its capability. We also present new results on the effects of network deployment parameters on sensor localization error, such as the level of network connectivity and the number of GPS-enabled nodes on the network. We compare time of arrival (TOA) and time difference of arrival (TDOA) ranging algorithms for sensor localization, and we consider the benefits of including available direction of arrival (DOA) estimates. Selected scenarios of UGS deployments are provided for comparison.

关键词： PODIS UGS volcano TDOA TOA DOA ranging sensor networks self-localization geolocation

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Achieving miniature sensor systems via advanced packaging techniques

Achieving miniature sensor systems via advanced packaging te...

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conference on unattended Ground sensor Technologies and Applications vii

作者： Hartup, DC Bobier, K Demmin, J Nova Engn Cincinnati OH 45246 USA

ISBN: (纸本)0819457817

Demands for miniaturized networked sensors that can be deployed in large quantities dictate that the packages be small and cost effective. In order to accomplish these objectives, system developers generally apply advanced packaging techniques to proven systems. A partnership of Nova Engineering and Tessera begins with a baseline of Nova's unattended Ground sensors (UGS) technology and utilizes Tessera's three-dimensional (3D) Chip-Scale Packaging (CSP), Multi-Chip Packaging (MCP), and System-in-Package (SIP) innovations to enable novel methods for fabricating compact, vertically integrated sensors utilizing digital, RF, and micro-electromechanical systems (MEMS) devices. These technologies, applied to a variety of sensors and integrated radio architectures, enable diverse multi-modal sensing networks with wireless communication capabilities. sensors including imaging, accelerometers, acoustical, inertial measurement units, and gas and pressure sensors can be utilized. The greatest challenge to high density, multimodal sensor networks is the ability to test each component prior to integration, commonly called Known Good Die (KGD) testing. In addition, the mix of multi-sourcing and high technology magnifies the challenge of testing at the die level. Utilizing Tessera proprietary CSP, MCP, and SIP interconnection methods enables fully testable, low profile stacking to create multi-modal sensor radios with high yield.

关键词： sensor systems miniaturization packaging system-in-package SIP

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Biometric tracking with coded pyroelectric sensor clusters

Biometric tracking with coded pyroelectric sensor clusters

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conference on unattended Ground sensor Technologies and Applications vii

作者： Shankar, M Burchett, J Feller, SD Jones, B Swagart, R Guenther, BD Brady, DJ Duke Univ Fitzpatrick Ctr Photon & Commun Durham NC 27706 USA

ISBN: (纸本)0819457817

Human bodies are very good heat sources with peak emission wavelength of about 9 mu m. We use pyroelectric detectors that are differential in nature to detect human motion by their heat emissions. Coded Fresnel lens arrays create boundaries in space which helps to localize the human motion as well as classification. We design and implement a low-cost biometric tracking system using off-the-shelf components. We demonstrate tracking and classification using sensor clusters of dual-element pyroelectric detectors with coded Fresnel lens arrays.

关键词： sensors Biometrics Fresnel lenses Infrared sensors pyroelectric detectors Visibility Computer aided design Infrared radiation Modulation sensor networks

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Environmentally adaptive acoustic transmission loss prediction with neural networks

Environmentally adaptive acoustic transmission loss predicti...

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conference on unattended Ground sensor Technologies and Applications vii

作者： Wichern, G Azimi-Sadjadi, MR Mungiole, M Colorado State Univ Ft Collins CO 80523 USA

ISBN: (纸本)0819457817

Prediction of acoustic transmission loss (TL), or the attenuation of sound pressure level (SPL) is a complex problem dependent on a variety of physical parameters. Prediction of the TL using a numeric parabolic equation (PE) method is often accepted as a method of providing accurate TL prediction, but the large computational time is a hinderance in applications requiring real-time situation awareness. In order to overcome these extreme computational requirements a neural network-based environmentally adaptive TL prediction method is proposed and developed in this paper. This method uses multiple back-propagation neural network (BPNN) predictors, each trained on specific environmental conditions., and then probabilistically combines the outputs of these predictors in a fusion center to obtain a final TL estimate. This method is implemented on a data set generated using a PE model for a wide range of geometric and environmental parameters. The results are then benchmarked against a single neural network-based prediction scheme.

关键词： acoustic propagation neural networks acoustic parabolic equation unattended acoustic sensors

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Disposable sensors: technical and operational challenges facing military employment

Disposable sensors: technical and operational challenges fac...

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conference on unattended Ground sensor Technologies and Applications vii

作者： Nocita, SK Bales, JM USA RDECOM CERDEC NVESD Ft Belvoir VA 22060 USA

ISBN: (纸本)0819457817

Advances in technologies are providing opportunities to increase situational awareness in military operations. One application of these technologies is small disposable sensor systems that have the potential to enhance the war-fighter's lethality and survivability. Considering that the sensors must be disposable, cost constraints increase the complexity of solving the technical and operational challenges. This paper will address two areas of consideration when designing disposable sensor systems: technical and operational. Technical design considerations: sensor communication networks are a hot area of development, with a multitude of standards and protocols to choose from. Miniaturization is providing a multitude of sensor modalities that can be considered for a disposable sensor. Decisions must be made between factors such as cost, size, and power requirements. Power management through hardware and software, coupled with more efficient batteries, is giving extended life to sensor systems. Environmental issues must be addressed in a disposable system. Operational design considerations: For systems monitored and managed directly by soldiers, one of the most important elements is the user interface, and its affect on overall system ease-of-use. System usefulness is also affected by the capability to autonomously monitor the area where sensors are deployed without a soldier present. The packaging of sensors will be affected by the current state of technology integrated into the sensors, as well as requirements for emplacement. These emplacement requirements and constraints will impact the operational effectiveness of the overall system.

关键词： disposable sensor soldier ease-of-use communications network protocols wireless emplacement

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Acoustic sensors on small robots for the urban environment

Acoustic sensors on small robots for the urban environment

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conference on unmanned Ground Vehicle Technology vii

作者： Young, SH Scanlon, MV USA Res Lab AMSRD ARLCICB Adelphi MD 20783 USA

ISBN: (纸本)0819457892

As the Army transforms to the Future Force, particular attention must be paid to operations in Complex and Urban Terrain. Because our adversaries realize that we don't have battlefield dominance in the urban environment, and because population growth and migration to urban environments is still on the increase, our adversaries will continue to draw us into operations in the urban environment. The Army Research Laboratory (ARL) is developing technology to equip our soldiers for the urban operations of the future. Sophisticated small robotic platforms with diverse sensor suites will be an integral part of the Future Force, and must be able to collaborate not only amongst themselves but also with their manned partners. The use of acoustic sensors on robotic platforms, as shown in this paper, will greatly aid the soldiers of the future force in performing numerous types of missions including Reconnaissance, Surveillance, and Target Acquisition (RSTA) by providing situational awareness, particularly to the dismounted soldier operating in the urban environment. The work conducted by the Army Research Laboratory, discussed in this paper will be transitioned to the FCS-Small unattended Ground Vehicle (SUGV) program and FFW. The Army Research Laboratory is already working with these programs to ensure a feasible migration path. This paper focuses on four areas relating to acoustic sensing on robots for the urban environment as demonstrated at the DoD Horizontal Fusion Portfolio's Warriors Edge (WE) Quantum Leap II (QL II) demonstration at Ft Benning, GA in August, 2004: small (man-portable) robot detection, mule-sized robot detection, sensor fusion across multiple platforms, and soldier/robot team interaction.

关键词： robot acoustic urban soldier FFW FCS-SUGV

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sensor deployment planning for unattended Ground sensor networks

Sensor deployment planning for Unattended Ground Sensor netw...

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

作者： McKitterick, JB Honey Int Columbia MD USA

ISBN: (纸本)0819453404

networks of unattended ground sensors are fast becoming a reality, but little attention has been paid to date to the problem of how to plan an effective deployment of these sensors. Since the performance of the networked sensors depends on weather, target type, communications, terrain. and on how the sensors cooperate, the problem of planning a deployment is a very complex one. We will show how these factors can be included in a deployment planning tool that allows the warfighter to plan a deployment of acoustic sensors in near-real time. This tool can also be used as a health-monitor for the network of sensors, allowing the warfighter to maintain the network of sensors at a level of effectiveness needed to meet the mission goals.

关键词： unattended Ground sensors deployment planning

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Automatic target detection and recognition approaches for unattended electro-optical sensors

Automatic target detection and recognition approaches for un...

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conference on unmanned and unattended sensors and sensors networks

作者： Mahalanobis, A Shah, M Lockheed Martin Missiles & Fire Control Orlando FL 32819 USA

ISBN: (纸本)0819455644

Automatic target detection and recognition (ATD/R) remains a challenging problem for unmanned and unattended systems. Promising solutions using Electro-Optical sensors such as LADARs, FLIRs, and TVs are evolving. The key issues are not only the performance of the individual sensors, but also the mutual calibration of the sensors and their collective behavior. This paper presents an overview of the challenges encountered in two separate ATD/R scenarios, and the methods that have been proposed for addressing them. Specifically, advanced techniques that exploit multiple views, collaborative sensor behavior and new sensing paradigms are reviewed and the concepts are illustrated by means of several examples.

关键词： sensors Cameras Target detection Detection and tracking algorithms Automatic target recognition Target recognition Algorithm development Image filtering Calibration Image processing

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