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4th IEEE Sensor Array and Multichannel Signal Processing Workshop

作者： Gieron, Roman Siatchoua, Patrice IMST GmbH Carl Friedrich Gauss Str 2 D-47475 Kamp Lintfort Germany

ISBN: (纸本)1424403081

Mobile satellite terminals especially with high-gain antenna require fast and accurate beam tracking algorithms for communication. The main topic of this paper is the extension of a tracking algorithm to mobile satellite communications, its implementation and performance. The presented considerations and simulation results concern low SNR condition and narrow antenna beam configuration as existing in satellite communications. The assumed satellite is geostationary. The work is presented in context of SANTANA-2 project, (Smart Antenna Terminal), founded and supported by the German DLR on behalf of BMBF. The realized terminal uses an antenna array in Ka-band and fully implements Digital BeamForming (DBF) to control the beam pointing direction and the antenna beam shape.

关键词： tracking algorithm antenna array array signal processing mobile satellite communications digital beamforming Ka-band

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tracking the Warhead Among Objects Separation from the Reentry Vehicle in a Clear Environment

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DEFENCE SCIENCE JOURNAL 2009年第2期59卷 113-125页

作者： Liu, Cheng-Yu Chen, Chi-Teh Lee Ming Inst Technol Dept Elect Engn Taipei Taiwan

Separating a reentry vehicle into warhead, main body, and debris is a conventional and efficient means of producing a huge decoy and increasing the kinetic energy of the warhead. This procedure Causes the radar to track the main body and debris, which radar cross section are large. and ignore the warhead, is the most important part of the reentry vehicle. The warhead is difficult to identify after separation using standard tracking criteria. This study presents a novel tracking algorithm by integrating input estimation and modified probabilistic data association filter to identity warhead among objects separation from the reentry vehicle in a clear environment. The proposed algorithm provides a good tracking capability tor the warhead ignoring the radar cross sec(ion. Simulation results reveal that the errors between the Updated and warhead trajectorics are reduced to a small interval in a short time. Therefore, the radar can generate it beam to illuminate the right area and keep tracking the warhead all the time. This algorithm is Worthy of further Study and application.

关键词： Input estimation probabilistic data assocition filter extended Kalman filter tracking algorithm trajectory estimation

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Fusion of Radar and IRST Sensor Measurements for 3D Target tracking using Extended Kalman Filter

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DEFENCE SCIENCE JOURNAL 2009年第2期59卷 175-182页

作者： Naidu, V. P. S. Natl Aerosp Labs Bangalore 17 Karnataka India

tracking algorithms for IRST and radar are implemented and their performance is checked with simulated data. Detailed mathematical expressions given Could be useful for implementation. Performance evaluation metrics have been presented to check the tracking algorithm performance. Two fusion schemes have been presented and their performances evaluated with simulated data. It is concluded that both fusion schemes performed alike with the second fusion scheme giving slightly better results. From the results, it is also concluded that fusion of IRST and radar would improve the tracking performance and reduce the positional uncertainty compared to individual trackers.

关键词： IRST sensor measurements 3-D target tracking Kalman filter tracking algorithm performance evaluation fusion schemes target tracking

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Beacon Recognition and tracking Based on Omni-vision

Beacon Recognition and Tracking Based on Omni-vision

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International Conference on Optical Instruments and Technology - Optical Systems and Optoelectronic Instruments

作者： Zhang, Baofeng Liu, Yuli Cao, Zuoliang Tianjin Key Lab Control Theory & Applicat Complic Tianjin Peoples R China Tianjin Univ Technol Tianjin Peoples R China

ISBN: (纸本)9780819474001

Omnidirectional vision (Omni-vision) has the feature that an extremely wide view can be achieved simultaneously. The omni-image brings a highly unavoidable inherent distortion while it provides hemispherical field of views. In this paper, a method called Spherical Perspective Projection is used for correction of such distorted image. Omni-vision target recognition and tracking with fisheye lens for AGVs appears definite significant since its advantage of acquiring all vision information of the three-dimensional space once. A novel Beacon Model and Omni-vision tracker for mobile robots is described. At present, the research of target model has many different problems, such as outdoor illumination, target veiling, target losing. Specially, outdoor illumination and beacon veiling are the key problems which need an effective method to solve. The new beacon model which features particular topology shape can be recognized in the outdoors with part veiled of the object. In this paper an improved omni-vision object tracking method based on mean shift algorithm is proposed. The mean shift algorithm which is a powerful technique for tracking objects in image sequences with complex background has been proved to be successful for the fast computation and effective tracking problems. The recognition and tracking functions have been demonstrated on experimental platform.

关键词： omni-vision beacon recognition tracking algorithm

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Design and Implementation a real-time TV tracking System Based on TMS320DM642

Design and Implementation a real-time TV Tracking System Bas...

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IEEE International Conference on Robotics and Biomimetics (ROBIO)

作者： Li, Shiqiang Chen, Tianding Yu, Changhong Zhejiang Gongshang Univ Coll Informat & Elect Engn Hangzhou Zhejiang Peoples R China

ISBN: (纸本)9781424447749

This paper introduces a real-time TV tracking system which is based on DSP(DM642). It narrates the principle of hardware design and the structure of the hardware in detail. A fast median filter algorithm, which is the most novelty in the system, is used to achieve the image pre-processed. And the algorithm of centroid calculated and Gaussian-fitting predicting approach are used to track the target. The experiment proves that this system can obtain continuous and stable tracking effect when the target is moving and covered up.

关键词： DM642 TV tracking tracking algorithm Gaussian-fitting

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Graph Based Visual Object tracking

Graph Based Visual Object Tracking

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2nd ISECS International Colloquium on Computing, Communication, Control and Management (CCCM 2009)

作者： Zhou Guanling Wang Yuping Dong Nanping Beijing Union Univ Coll Automat Beijing Peoples R China

ISBN: (纸本)9781424442461

Object tracking is viewed as a two-class "one-versus-rest" classification problem, in which the sample distribution of the target is approximately Gaussian while the background samples are often multi-modal. Based on these special properties, we model the visual appearance via graph approach, which is a semi-supervised approach. The topology structure of graph is carefully designed to reflect the properties of the sample's distribution. The confidence of sample's label is computed via random walk with restart (RWR). The primary advantage of our algorithm is that it keeps the appearance of object via semi-supervised method. Experimental results demonstrate that, compared with two state of the art methods, the proposed tracking algorithm is more effective, especially in dynamically changing and clutter scenes.

关键词： visual object tracking algorithm send-supervised method multi-modal

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Improving MIMO-OFDM decision-directed channel estimation by utilizing error-correcting codes

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ADVANCES IN RADIO SCIENCE 2009年 7卷 83-88页

作者： Beinschob, P. Lieberei, M. Zoelzer, U. Univ Fed Armed Forces Hamburg Dept Signal Proc & Commun Helmut Schmidt Univ Hamburg Germany

In this paper a decision-directed Multiple-Input Multiple-Output (MIMO) channel tracking algorithm is enhanced to raise the channel estimate accuracy. While DDCE is prone to error propagation the enhancement employs channel decoding in the tracking process. Therefore, a quantized block of symbols is checked on consistency via the channel decoder, possibly corrected and then used. This yields a more robust tracking of the channel in terms of bit error rate and improves the channel estimate under certain conditions. Equalization is performed to prove the feasibility of the obtained channel estimate. Therefore a combined signal consisting of data and pilot symbols is sent. Adaptive filters are applied to exploit correlations in time, frequency and spatial domain. By using good error-correcting coding schemes like Turbo Codes or Low Density Parity Check (LDPC) codes, adequate channel estimates can be acquired even at low signal to noise ratios (SNR). The proposed algorithm among two others is applied for channel estimation and equalization and results are compared.

关键词： .Parity error-correcting tracking algorithm channel estimate DDCE Improving MIMO-OFDM decision-directed

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A Low Cost 1K Elements Phased Array Antenna

A Low Cost 1K Elements Phased Array Antenna

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IEEE/MTT-S International Microwave Symposium

作者： Mousavi, Pedram Fakharzadeh, Mohammad Safavi-Naeini, Safieddin Intelwaves Technol Waterloo ON Canada Univ Waterloo Waterloo ON N2L 3G1 Canada

ISBN: (纸本)9781424428038

In this paper, a low cost phased array antenna system with nearly 1K microstrip antenna patches for mobile broadcast satellite reception in Ku-band will be introduced. The height of the antenna is only 6 cm and the system has two-dimensional electronic scanning capability. The main objective of this design is to develop phased array system with very low cost components and a minimum number of tracking sensors. A novel beamforming algorithm compensates for the fabrication inaccuracies of the microwave components and variations in their characteristics due to ambient changes.

关键词： Phased array antenna tracking algorithm array signal processing satellite tracking

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Study of APT System for Laser Atmosphere Communication

Study of APT System for Laser Atmosphere Communication

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Asia-Pacific Conference on Information Processing (APCIP 2009)

作者： Li Da-she Nai Chang-xin Hua Zhen China Univ Min & Technol Coll Comp Sci & Technol Shandong Inst Econ & Technol Beijing Peoples R China Shandong Inst Econ & Technol Sch Informat & Elect Engn Beijing Peoples R China

ISBN: (纸本)9780769536996

Using the laser transmission characteristic in atmosphere channel and request for APT. a new type of APT system is designed for real time communication. Work principles of each part are discussed in details. On the basis of a new idea of target location and tracking algorithm, specifically flow and corresponding tracking algorithms is designed in order to accomplish the beam acquistition, pointing and tracking QD model is built for treatment method of error. So the system is viable.

关键词： laser atmosphere tracking algorithm

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On local tracking algorithms for the simulation of three-dimensional discontinuities

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COMPUTATIONAL MECHANICS 2008年第3期42卷 395-406页

作者： Jaeger, Philippe Steinmann, Paul Kuhl, Ellen Univ Erlangen Nurnberg Dept Mech Engn D-91058 Erlangen Germany Univ Kaiserslautern Dept Mech Engn D-67653 Kaiserslautern Germany Stanford Univ Dept Mech Engn Stanford CA 94305 USA Stanford Univ Dept Bioengn Stanford CA 94305 USA

The present manuscript focuses on the algorithmic treatment of three-dimensional discontinuities within a purely displacement based finite element setting. In contrast to two-dimensional cracks, the local element based geometric representation of three-dimensional crack surfaces is non-unique and thus not straightforward. Accordingly, we compare different crack tracking strategies, one being algorithmically extremely efficient but yet somehow restrictive, the other one being more complex but rather general in nature. While the first method is able to represent entirely smooth discontinuity surfaces, the second approach introduces inter-element discontinuities in the overall crack surface representation. Both methods are compared systematically and additional comments about the algorithmic realization are provided. From the numerical results we conclude that neither of the two algorithms is able to solve all defined quality criteria satisfactorily, although both are mesh independent, computationally cheap and rather efficient. The ultimate solution might be an overall global crack surface representation that a priori circumvents a number of algorithmic deficiencies and at the same time provides a unique and smooth three-dimensional crack surface representation.

关键词： strong discontinuities 3D crack propagation tracking algorithm cohesive law

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