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检索条件"主题词=Localization algorithm"

共 223 条记录，以下是171-180 订阅

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On Computation of Distributed Supervisory Controllers in Discrete-Event Systems

On Computation of Distributed Supervisory Controllers in Dis...

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24th Chinese Control and Decision Conference (CCDC)

作者： Zhang Renyuan Gan Yongmei Wang Zhaoan Wonham, W. M. Xi An Jiao Tong Univ Sch Elect Engn Xian 710049 Shaanxi Peoples R China Univ Toronto Dept Elect & Comp Engn Toronto ON M5S3G4 Canada

ISBN: (纸本)9781457720727

This paper refines an earlier localization procedure used to design optimal nonblocking distributed supervisory controllers in discrete-event systems (DES). The earlier algorithm needed a control consistency relation involving two conditions, and introduced superfluous selfloops. We propose a refined procedure, including a newly defined weak control consistency relation, and a cleanup algorithm, which results in simpler and cleaner controllers. It is proved to be correct, and illustrated by a Transfer Line plant.

关键词： Distributed supervisory controller localization algorithm discrete-event system

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An Improved DV-Hop algorithm Based on Average Hop Distance and Estimated Coordinates 29

An Improved DV-Hop Algorithm Based on Average Hop Distance a...

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第29届中国控制与决策会议

作者： Wei Gao Yue Sun Wenjun Li Wenqiang Wang College of Communication Engineering Jilin University

ISBN: (纸本)9781509046584

There is a big error in the classic DV-Hop localization algorithm in average hop distance and unknown point *** propose an improved DV-Hop location algorithm,by improving the average hop distance and introducing a checkout algorithm in the second and third stages of the classic DV-Hop localization algorithm,to improve the position *** MATLAB simulation shows that in the same test situation,without significantly increasing calculating complexity and requiring additional hardware,the performance of the improved DV-Hop algorithm in wireless sensor network is better compared with the classic algorithm.

关键词： Wireless sensor network DV-Hop localization algorithm Average hop distance Checkout algorithm

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Autonomous Energy Harvesting in Swarm of Biosensors for Precision Medicine 7

Autonomous Energy Harvesting in Swarm of Biosensors for Prec...

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7th Iranian Joint Congress on Fuzzy and Intelligent Systems (CFIS)

作者： Raz, Nasibeh Rady Akbarzadeh-T, Mohammad-R. Ferdowsi Univ Mashhad Dept Comp & Elect Engn Ctr Excellence Soft Comp & Intelligent Informat P Mashhad Razavi Khorasan Iran

ISBN: (纸本)9781728106731

Precision Medicine (PM) employs varieties of smart equipment for customizing the therapy using molecular level analysis. Biosensors are considered among the main smart equipment in the PM. There are different challenges in biosensor application that among them energy harvesting is selected to be the focus of this paper through oxidation of blood sugars by enzymatic implanted biobatteries. Here, the used biobatteries are applied to recharge the biosensors which are in the powered-down state. The place of each biobattery is known and considered as an anchor point. However, the place of each powered-down biosensor is estimated using localization algorithms such as distance-based localization and Extended Kalman Filter (EKF). The biosensors will be recharged if they are in the area of biobatteries. The proposed approach outperforms the rest by using autonomous energy harvesting, precise location estimation and no need for external energy or invasive methods for biosensors recharging.

关键词： localization algorithm biosensor precision medicine energy harvesting

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Optimized Super-Resolution Ranging over ToA Measurements

Optimized Super-Resolution Ranging over ToA Measurements

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IEEE Wireless Communications and Networking Conference (WCNC)

作者： Oshiga, Omotayo Severi, Stefano Abreu, Giuseppe Jacobs Univ Bremen Campus Ring 1 D-28759 Bremen Germany

ISBN: (纸本)9781479930838

We propose a new accurate ranging algorithm for Time of arrival (ToA)-based wireless network localization. Although many works have been done in the current literature to optimize localization and tracking algorithms, the mitigation of ranging errors is still a very challenging problem. To this end, we combine and optimize two well-known super-resolution algorithms such as Music and Root-Music, commonly used in the estimation of the direction of arrival of incoming signal sources of a linear antenna array, with the powerful mathematical notion of a Golomb Ruler. The results are proved to be tremendously efficient and to almost reach the fundamental localization limits depicted by the Cramer-Rao lower bound (CRLB).

关键词： direction-of-arrival estimation linear antenna arrays radio networks signal sources time-of-arrival estimation CRLB Cramε?r-Rao lower bound Golomb Ruler ToA measurement direction of arrival estimation linear antenna array localization algorithm ranging error mitigation superresolution ranging algorithm time of arrival-based wireless network localization tracking algorithm Arrays Covariance matrices Distance measurement Multiple signal classification Signal resolution Vectors Wireless networks

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Touchless 3D gestural interface using coded ultrasounds

Touchless 3D gestural interface using coded ultrasounds

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IEEE International Ultrasonics Symposium (IUS)

作者： Carotenuto, Riccardo Tripodi, Pietro Univ Mediterranea Reggio Calabria DIMET I-89122 Reggio Di Calabria Italy

ISBN: (纸本)9781467345620;9781467345613

Touchless human-computer interfaces are possible using wireless position sensors with sufficient positioning accuracy. The proposed locating system is composed of a set of beacons that emit a sequence of ultra-acoustic pulses in the space region containing a number of wireless position sensors. The prototype has four coplanar beacons, placed at the corners of a PC screen, which are forced to emit chirp signals in the 20-48 kHz band. Each battery-supplied sensor is equipped with a wideband miniature microphone, a conditioning circuitry and an infrared transmitter. When impinged by the sequence of acoustic wavefronts, each sensor sends back a signal to a central unit through an infrared optical transmission channel. The central unit preprocesses the received signals using the correlation technique, and obtains the times of arrival of the sensors' signals. Knowing the position of the acoustic beacons, the central unit computes the coordinates of the sensors, identifying and discarding possible false signals due to echoes and environmental noise. All the computations, including signal filtering, time of arrival detection, localization and results display, are carried out by a notebook PC at 25 Hz.

关键词： localization sensors localization algorithm touchless gestural interface airborne ultrasounds

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An Improved Amorphous algorithm in Wireless Sensor Network Based On Approximate Equilateral Triangle Beacon Selection

An Improved Amorphous Algorithm in Wireless Sensor Network B...

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2017 International Conference on Networking and Network Applications (NaNA)

作者： Shen, Shikai Qian, Kaiguo Yang, Bin She, Yumei Wang, Wu Wang, Yujian Future Univ Hakodate Sch Syst Informat Sci Hakodate Hokkaido 0418655 Japan Kunming Univ Sch Informat & Technol Kunming 650214 Yunnan Peoples R China Kunming Univ Dept Phys Sci & Technol Kunming 650214 Yunnan Peoples R China Chuzhou Univ Sch Comp & Informat Engn Chuzhou 239000 Peoples R China Yunnan Minzu Univ Sch Math & Comp Sci Kunming 650031 Yunnan Peoples R China

ISBN: (纸本)9781538606049

Node localization is significant importance for supporting many critical applications in wireless sensor networks. However, traditional Amorphous localization algorithm and its variants still cannot provide sufficient localization accuracy. We propose an improved amorphous algorithm in wireless sensor network based on approximate equilateral triangle beacon selection(AET-Amorphous), which first employs hops threshold design and approximate equilateral triangle function to select the three beacons as reference nodes, and then two-dimensional hyperbolic calculation method is adopted instead the classic trilateration/least square method to determine the locations of unknown nodes, which can eliminate error and improve the node location accuracy. Simulations are conducted to validate the accuracy of our proposed localization algorithm in wireless sensor networks. Remarkably, the average localization error of our proposed localization algorithm is lower than those of Amorphous and its improved algorithms, under both Square-shaped and C-shaped random uniformly node distributions.

关键词： Wireless Sensor Network (WSN) localization algorithm Approximate Equilateral Triangle Average Relative Positioning Error

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802.11 Protocol Based Indoor Geolocation

802.11 Protocol Based Indoor Geolocation

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International Conference on MultiMedia and Information Technology

作者： Gao, Xiaoxing Wang, Fei Liu, Jian Wang, Yimo NEU Software Coll Shenyang Liaoning Prov Peoples R China Dalian Univ Technol Dept Comp Sci & Engn Dalian Peoples R China

ISBN: (纸本)9780769535562

localization is always a critical technology of wireless network. This paper introduces the theory of RSS-base localization, sets up a new localization algorithm and analyzes excellence of this algorithm. This paper compares it with other algorithms and copares their localization accuracy and directional judgement accuracy by indoor experiments. The result indicates that analysis of the noises and circumstance will help direction and improving the localization accuracy.

关键词： Wireless network RSS localization algorithm Wi-Fi Noise Division

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Landscape: A high performance distributed positioning scheme for outdoor sensor networks

Landscape: A high performance distributed positioning scheme...

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IEEE International Conference on Wireless and Mobile Computing, Networking and Communications

作者： Zhang, LQ Cheng, Q Wang, YG Zeadally, S

ISBN: (纸本)0780391829

In this work, we consider the sensor localization problem from a novel perspective by treating it as a functional dual of target tracking. In traditional tracking problems, static location-aware sensors track and predict the position/speed of a moving target. As a dual, we utilize a moving location-assistant (LA) (with global positioning system (GPS) or pre-defined moving path) to help location-unaware sensors to accurately discover their positions. We call our proposed system Landscape. In Landscape, an LA (an aircraft, for example) periodically broadcasts its current location while it moves around or through a sensor field. Each sensor collects the location beacons, measures the distance between itself and the LA based on received signal strength (RSS), and individually calculates their locations via an Unscented Kalman Filter (UKF) based algorithm. Our contributions are at least twofold. (1) Landscape is a distributed scheme, it does not rely on measured distances among neighbors (as used by most current proposals), which makes it robust to topology and density;Landscape involves zero sensor-to-sensor communication overhead, and is highly scalable to network size. (2) By introducing UKF in sensor localization problem, we reap multiple benefits: our UKF-based algorithm nicely exploits the constraints increasingly added by the beacons;it elegantly solves the nonlinear problem with low computation cost and complexity;and most importantly, it efficiently reduces the effects of measurement errors, making Landscape robust to ranging errors. Extensive simulations and evaluations against the state-of-the-art systems show that Landscape is a high-performance sensor positioning scheme for outdoor sensor networks.

关键词： wireless sensor networks localization algorithm unscented Kalman filter

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An ubiquitous positioning system based on IEEE 802.15.4 radio signals

An ubiquitous positioning system based on IEEE 802.15.4 radi...

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International Conference on Indoor Positioning and Indoor Navigation (IPIN)

作者： Rolando, Alberto Amoruso, Emanuele Politecn Milan Dept Aerosp Sci & Technol I-20133 Milan Italy

ISBN: (纸本)9781479940431

This work presents a theoretical and experimental study of methods and strategies to implement an ubiquitous positioning system based on IEEE 802.15.4 radio signals. Ranging phase is first analyzed. An empirical method, for a combined use of both Received Signal Strength Indicator (RSSI) and Time Of Flight (TOF) measures, is proposed. Distance measurements performed in different scenarios highlight that RSSI measures provide lower errors on short distance while TOF measures are more suitable for longer distances. The RSSI threshold in use can be different for every scenario but our measurements show that it can be well identified by observing the relevant RSSI calibration curve. Once this threshold is identified, a complementary use of RSSI and TOF measures is then possible. Subsequently the positioning phase is analyzed. The main range-based and centralized localization algorithms are at first compared using simulated localizations, both in their cooperative and non cooperative version, in order to have a complete overview of their performances. However, the considered driving case study (the position monitoring of vehicles/assets in a typical airport area) puts in evidence the requirement for a non cooperative localization strategy. In this condition simulations show that the optimization approach outperforms the other localization algorithms. The deterministic optimization has been also preferred to the stochastic one: position accuracy being equal, the stochastic optimization methods also need the preliminary set up of different parameters through several simulations and trials. Real-world positioning tests, considering indoor and outdoor scenarios of different sizes (from ten to some hundreds of meters) confirm the validity of this choice, the effectiveness of the proposed ranging method and also the importance of exploiting anchors' redundancy. However, position accuracy is still poor for the most noisy scenarios. Future works should focus on the development o

关键词： ubiquitous localization IEEE 802.15.4 RSSI time of flight localization algorithm real-world positioning tests

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Optimization algorithm for Seismic Location of Underground Objects 15

Optimization Algorithm for Seismic Location of Underground O...

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15th International Asian School-Seminar on Optimization Problems of Complex Systems (OPCS)

作者： Pinigina, Daria Yakimenko, Alexander Novosibirsk State Tech Univ Dept Comp Engn Novosibirsk Russia Novosibirsk State Tech Univ Inst Computat Math & Math Geophys SB RAS Lab Geophys InformatDept Comp Engn Novosibirsk Russia

The paper considers the possibility of using the seismic event localization algorithm for localizing objects of the geophysical model of the environment. When adapting this algorithm the localization algorithm for poi... 详细信息

ISBN: (纸本)9781728129860

关键词： localization algorithm objects of the geophysical model of the environment seismic

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