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

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Design and integration of a compact common miniature environment-insensitive navigation module for unmanned vehicles

Design and integration of a compact common miniature environ...

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conference on unmanned/unattended sensors and sensor networks VII

作者： Dai, Gang Su, Wei Li, Mei China Acad Engn Phys Inst Elect Engn Mianyang 621900 Sichuan Peoples R China

ISBN: (纸本)9780819483515

A common miniature environment-insensitive navigation module which not only can provide the accurate position through different environment but also can easily be configured to adapt to the different type of unmanned vehicles is proposed in this paper. The module prototype is composed of a integrated MEMS inertial navigation unit using MEMS accelerometers and gyroscopes, a hard aluminum module structure with rubber isolator, a series of sensor interface of magnetometer, embedded GPS receiver, infrared sensor, vision camera, radio frequency communication etc and a FPGA based central control and navigation calculation circuit. The fabricated MEMS accelerometers and gyroscopes can resist high-g shock and have temperature drift compensation. The structure of the module uses hard aluminum with finite element analysis to find the appropriate position for sensors. All sensors without antenna are packaged in the structure with moisture, heat isolation and rubber isolator. The navigation computation scheme use the status of connected sensors to choose appropriate algorithm function to compute the navigation output. FPGA is used to be the main control and process unit of this module. Algorithms are embedded in the FPGA using the DSP core. The multiply interfaces to other sensor are implemented using the flexible configuration of the FPGA and peripheral. The conclusions are reached at last.

关键词： environment insensitive navigation GPS microaccelerometer microgyroscope temperature compensation

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Distributed, Collaborative Human-Robotic networks for Outdoor Experiments in Search, Identify and Track

Distributed, Collaborative Human-Robotic Networks for Outdoo...

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conference on unmanned/unattended sensors and sensor networks VII

作者： Lee, Daniel McClelland, Mark Schneider, Joseph Yang, Tsung-Lin Gallagher, Dan Wang, John Shah, Danelle Ahmed, Nisar Moran, Pete Jones, Brandon Leung, Tung-Sing Nathan, Aaron Kress-Gazit, Hadas Campbell, Mark Cornell Univ Sibley Sch Mech & Aerosp Engn Ithaca NY 14853 USA

ISBN: (纸本)9780819483515

This paper presents an overview of a human-robotic system under development at Cornell which is capable of mapping an unknown environment, as well as discovering, tracking, and neutralizing several static and dynamic objects of interest. In addition, the robots can coordinate their individual tasks with one another without overly burdening a human operator. The testbed utilizes the Segway RMP platform, with lidar, vision, IMU and GPS sensors. The software draws from autonomous systems research, specifically in the areas of pose estimation, target detection and tracking, motion and behavioral planning, and human robot interaction. This paper also details experimental scenarios of mapping, tracking, and neutralization presented by way of pictures, data, and movies.

关键词： cooperative robots mapping tracking human-robotic interaction

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Seismic-acoustic communication for UGS

Seismic-acoustic communication for UGS

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conference on unattended Ground, Sea, and Air sensor Technologies and Applications xii

作者： Cechak, Jaroslav Univ Def Fac Mil Technol Brno 66210 Czech Republic

ISBN: (纸本)9780819481573

The paper deals with unattended Ground sensors (UGS) and takes into consideration both present and future aspects of the practical deployment of this equipment under conditions of Electronic Warfare (EW), including the integration of UGS into a joint system using the unmanned Aircraft System (UAS). The first part of the paper deals with the possibilities, characteristics and useable properties of seismic-acoustic communication in the group of nodes, supplementing the information coverage of existing UGS, including the selection of a suitable working frequency band for seismic communication. The second part of the paper then describes an alternative method of communication between nodes and UGS using LF radio communication, and analyses the design and real properties of a proposed communication channel in LF band, the design of a loop antenna and its mechanical construction. The interim conclusions of each section generalize the results of seismic-acoustic and radio LF communications as verified in practice, and describe both the advantages and disadvantages of communication channels defined in this way. The third part of the paper deals with the possibility of integrating the nodes-UGS to a central system consisting of a UAS device. It covers the design and an energy evaluation of a system operating on the principle of data selection from UGS. In addition, the paper includes illustrative photographs of the practical design and graphic results of real measurements.

关键词： unattended ground sensor Intruder detection LF communication Seismic communication Remote sensing UAV equipment

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Effects of atmosphere on free-space optical transmission at 1.55 μm

Effects of atmosphere on free-space optical transmission at ...

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conference on unmanned/unattended sensors and sensor networks VII

作者： Zeller, John Manzur, Tariq USN Undersea Warfare Ctr Newport RI 02841 USA

ISBN: (纸本)9780819483515

Free-space optics (FSO) holds the potential for high bandwidth communication, but atmospheric conditions can significantly affect the capability of this type of communication system to transfer information consistently and operate effectively. The effects of atmosphere on FSO communication and consequent optimal wavelength range for transmission are investigated through MODTRAN-based modeling of 1.55 mu m transmission for multiple elevation angles in atmospheric weather conditions including clear maritime, desert extinction, and various levels of rain and fog, to simulate surface-to-surface and surface-to-air FSO communication networks. Furthermore, atmospheric, free-space, and scintillation losses are analyzed for optical path lengths of 2 km to determine minimum transmit power required for successful data reception. In addition, FSO transmitter and receiver circuits were designed to optically relay analog video signals and their operation verified at path distances of up to 130 m. Using advanced laser sources to provide illumination at infrared wavelengths, particularly around the eye-safe 1.55 mu m wavelength, it should be possible to overcome many transmission limitations associated with atmospheric conditions such as adverse weather and turbulence.

关键词： Free-space optics MODTRAN communication networks infrared lasers

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Edge Systems in the Deep Ocean

Edge Systems in the Deep Ocean

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conference on unattended Ground, Sea, and Air sensor Technologies and Applications xii

作者： Coon, Andrew Earp, Samuel L. Def Adv Res Projects Agcy 3701 N Fairfax Dr Arlington VA 22203 USA Multisensor Sci LLC Ellicott City MD 21042 USA

ISBN: (纸本)9780819481573

DARPA has initiated a program to explore persistent presence in the deep ocean. The deep ocean is difficult to access and presents a hostile environment. Persistent operations in the deep ocean will require new technology for energy, communications and autonomous operations. Several fundamental characteristics of the deep ocean shape any potential system architecture. The deep sea presents acoustic sensing opportunities that may provide significantly enhanced sensing footprints relative to sensors deployed at traditional depths. Communication limitations drive solutions towards autonomous operation of the platforms and automation of data collection and processing. Access to the seabed presents an opportunity for fixed infrastructure with no important limitations on size and weight. Difficult access and persistence impose requirements for long-life energy sources and potentially energy harvesting. The ocean is immense, so there is a need to scale the system footprint for presence over tens of thousands and perhaps hundreds of thousands of square nautical miles. This paper focuses on the aspect of distributed sensing, and the engineering of networks of sensors to cover the required footprint.

关键词： Deep Ocean Distributed sensors Autonomous Operations

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Image Processing Algorithm for Integrated Sense And Avoid Systems

Image Processing Algorithm for Integrated Sense And Avoid Sy...

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conference on unmanned/unattended sensors and sensor networks VII

作者： Forlenza, Lidia Fasano, Giancarmine Accardo, Domenico Moccia, Antonio Rispoli, Attilio Univ Naples Federico II Dept Aerosp Engn DIAS I-80125 Naples NA Italy Italian Aerosp Res Ctr CIRA I-81043 Capua CE Italy

ISBN: (纸本)9780819483515

To allow unmanned Aircraft Systems (UAS) accessing National Airspace System (NAS) "Equivalent levels of safety" to the ones of human vision must be guaranteed. Therefore, an appropriate "Sense and Avoid" technology must be developed that is capable of detecting, tracking, and avoiding obstacles. The Department of Aerospace Engineering at University of Naples has been involved in a project funded by the Italian Aerospace Research Centre (CIRA) for the realization of a prototypical "Obstacle Detection & Identification" (ODID) System. It is installed onboard a Very Light Aircraft (VLA) and it is characterized by a hierarchical sensor configuration in which the radar is the main sensor while EO cameras are the auxiliary ones in order to increase accuracy and data rate so that anti-collision requirements are fulfilled. This paper focuses on the Image Processing algorithm for the panchromatic camera. Among the several techniques listed in literature the edge detection - labeling one resulted as the best compromise in terms of computational load, detection range, false alarm rate, miss detection rate and adaptability at different background luminosity conditions. Moreover it has been customized in order to allow for reliable operation in a wide range of flight and luminance configurations and it has been tested and run on a sequence of real images taken during flight tests. At the end, a table that summarizes those results is presented. Indeed, the output tracking measurements accuracy increases by an order of magnitude with respect to standalone radar one.

关键词： Detect Sense and Avoid (DS&A) unmanned Aerial Systems (UAS) unmanned Aerial Vehicles (UAV) Multisensor data fusion Airborne Image Tracking Real-Time Image Processing Autonomous Anti Collision Systems

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Keeping our waterways safe by equipping commercial vessels with appropriate sensor suites to enable pervasive surveillance of coastal and inland waterborne commercial traffic

Keeping our waterways safe by equipping commercial vessels w...

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conference on unattended Ground, Sea, and Air sensor Technologies and Applications xii

作者： Feeley, Terry Lavoie, James Rite Solut Middletown RI 02842 USA

ISBN: (纸本)9780819481573

The US has over 58,000 miles of ocean shoreline, over 5500 hundred miles of Great Lakes shoreline, and over 3,500,000 miles of river and small lake shoreline. These waterways are critical to the nation's strategic, economic and societal well being. These assets must be protected from potential terrorist attacks. It is a daunting task for an open society to protect such a large and distributed area while still preserving the freedoms for its citizens to enjoy the natural beauty of our waterways. The US has a well developed fleet of merchant tugs and barges that engage in day to day commercial activity around the coasts, rivers and lakes of the country. This paper will discuss the notion of developing a nationwide mobile sensor network by equipping these barges and tugs with sensor suites that would feed data into a common operations' center. The data will be displayed to the first responder community and the vessel operators via data streams from Rite-View (a robust 3D modeling and simulation tool).

关键词： sensors Homeland security Surveillance 3D modeling Data centers Data modeling Computer security sensor networks Situational awareness sensors Warfare

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VIGILANT: "Situation-Aware" Quality of Information Interest Groups for Wireless sensor Network Surveillance Applications

VIGILANT: "Situation-Aware" Quality of Information Interest ...

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conference on unmanned/unattended sensors and sensor networks VII

作者： Ghataoura, D. S. Mitchell, J. E. Matich, G. E. UCL Gower StTorrington Pl London WC1E 7JE England Selex Galileo Ltd Basildon SS14 3EL Essex England

ISBN: (纸本)9780819483515

Effective situation awareness is a critical element for decision support in a wide range of military and para-military operational surveillance scenarios. Effective situation awareness in a surveillance scenario can greatly increase operational effectiveness, by improving the quality and timeliness of decisions. In this paper we outline a three level integrated design approach to promote situation awareness. Our approach allows deployed wireless sensor nodes to efficiently self-organise into dynamic clusters, based on a current common perceived threat situation ( context). Firstly our distributed predator aware situation assessment system ( PORTENT) models, detects and presents, in terms of quality of information (QoI), potential situations occurring within an uncertain environment. Secondly, we utilise a Bayesian belief network to understand the significance associated with the potential situation. Finally in order to obtain a better shared awareness we have developed a "context aware" service protocol that supports group formation and efficient management of sensor network assets. By combining this three level approach, we present our VIGILANT "situation aware" QoI interest group system. Extensive simulations have been undertaken to verify the VIGILANT concept, to demonstrate the effectiveness of our approach, in improving performance for network management efficiency, through utilisation of a shared "context" service provision time and QoI surveillance presentation.

关键词： Wireless sensor networks Quality of information Context aware applications Network management Distributed situation awareness Bayesian belief networks Certainty factor model Surveillance Geo-localisation

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Heterogeneous sensor networks: A Bio-Inspired Overlay Architecture

Heterogeneous Sensor Networks: A Bio-Inspired Overlay Archit...

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conference on Ground/Air Multi-sensor Interoperability, Integration, and Networking for Persistent ISR

作者： Burman, Jerry Hespanha, Joao Madhow, Upamanyu Klein, Daniel Isaacs, Jason Venkateswaran, Sriram Pham, Tien Teledyne Sci Co 1049 Camino Dos Rios Thousand Oaks CA 91360 USA Univ Calif Santa Barbara Dept Elect & Comp Engn Santa Barbara CA 93106 USA US Army Res Lab Adelphi MD 20783 USA

ISBN: (纸本)9780819481580

Teledyne Scientific Company, the University of California at Santa Barbara (UCSB) and the Army Research Lab are developing technologies for automated data exfiltration from heterogeneous sensor networks through the Institute for Collaborative Biotechnologies (ICB). unmanned air vehicles (UAV) provide an effective means to autonomously collect data from unattended ground sensors (UGSs) that cannot communicate with each other. UAVs are used to reduce the system reaction time by generating autonomous data-driven collection routes. Bio-inspired techniques for search provide a novel strategy to detect, capture and fuse data across heterogeneous sensors. A fast and accurate method has been developed for routing UAVs and localizing an event by fusing data from a sparse number of UGSs;it leverages a bio-inspired technique based on chemotaxis or the motion of bacteria seeking nutrients in their environment. The system was implemented and successfully tested using a high level simulation environment using a flight simulator to emulate a UAV. A field test was also conducted in November 2009 at Camp Roberts, CA using a UAV provided by AeroMech Engineering. The field test results showed that the system can detect and locate the source of an acoustic event with an accuracy of about 3 meters average circular error.

关键词： unattended Ground sensor unmanned Air Vehicle Data Exfiltration Autonomous Operations Bio-Inspired Algorithms Chemotaxis Likelihood Function Data Fusion Route Planning Source Localization Acoustic Event Classification Particle Swarm Optimization Quadratically Constrained Least Squares Minimization

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MWIR room temperature photodetector based on laser-doped silicon carbide

MWIR room temperature photodetector based on laser-doped sil...

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conference on unmanned/unattended sensors and sensor networks VII

作者： Lim, Geunsik Manzur, Tariq Kar, Aravinda Univ Cent Florida CREOL Coll Opt & Photon Laser Adv Mat Proc LabDept Mech Mat & Aerosp Eng Orlando FL 32816 USA Undersea Warfare Electromagnet Syst Dev I&EW S&T Lead Newport RI 02841 USA

ISBN: (纸本)9780819483515

MWIR photon detector in the mid-infrared wavelength (2-5 mu m) range is developed using crystalline silicon carbide substrates. SiC, which is a wideband gap semiconductor, is laser-doped to create a dopant energy level corresponding to a quantum of energy for the required operating wavelength of the detector. The photons of the objects in the field of view excite the electrons of the detector, leading to changes in the refractive index. This change in the optical property of the detector can be measured remotely with a laser beam, such as a He-Ne laser beam of wavelength 632.8 nm, which makes it a wireless detector. While many IR detectors require cryogenic cooling ( 77 K) to suppress thermal generation-recombination processes in order to operate with good detectivity, the SiC-based detector can operate at room temperature with excellent performance. An n-type 4H-SiC substrate has been doped with Ga by a laser doping technique to create a detector element for the MWIR wavelength of 4.21 mu m corresponding to the photon energy 0.30 eV. The dopant energy level is confirmed by optical absorption measurements. The change in the refractive index is studied as a function of absorbed irradiance on the detector. The experimental result shows that the Ga-doped 4H-SiC sample can be used for MWIR detectors.

关键词： sensors Silicon carbide Mid-IR Refractive index Photodetectors Reflectivity Silicon Absorption Infrared sensors Semiconductors

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