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检索条件"主题词=processing algorithm"

共 80 条记录，以下是71-80 订阅

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Design and implementation of matrix transpose based on SMP system

Design and implementation of matrix transpose based on SMP s...

引用

IET International Radar Conference 2015

作者： Ke Lei Ge Wei Panzhihua University Sichuan 617000 China State Nuclear Power Research Institute Beijing 102209 China

The paper studies the processing method of matrix transpose in symmetric multiprocessor (SMP) parallel processing system. It proposes a two-dimensional equilibrium interleaving matrix transposition algorithm which is suitable for SMP systems by analysing two factors that influence the access efficiency of DDR. The total number of active pages in processing of accessing matrix is reduced by the processing algorithm through dividing the matrix into many small matrixes which also saves a lot of expenditure of time. It is made according with the burst character of DDR by adopting the way of interleaving storage of rows and columns in pages which increases the efficiency of accessing pages' data. Test results show that the rows and columns have almost the same access bandwidth and two-dimensional average bandwidth can reach 86.7% of the theoretical bandwidth. The algorithm can solve the problem of matrix transpose in synthetic aperture radar system.

关键词： Matrix transpose SDRAM burst length SMP system Synthetic aperture radar matrix transpose Synthetic aperture radar switched mode power supplies processing algorithm Bandwidth Parallel processing systems

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Novel Time-Frequency-Eigen Filter for Intraoperative Neurophysiologic Monitoring in Spinal Surgeries

Novel Time-Frequency-Eigen Filter for Intraoperative Neuroph...

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International IEEE/EMBS Conference on Neural Engineering

作者： Krishnatej Vedala S. M. Amin Motahari Mohammed Goryawala Mercedes Cabrerizo Ilker Yaylali Malek Adjouadi Center for Advanced Technology and Education FIU College of Engineering and Computing Department of Clinical Neurophysiology Oregon Health and Science University

ISBN: (纸本)9781467319676

We present a novel signal-processing algorithm to extract the posterior tibial somatosensory evoked potentials (tSSEP) using a minimum number of trials. We analyze the proposed algorithm and compare it with the clinically used conventional signal averaging method for 12 surgical procedures. The tSSEP trials are continuously fed to our processing algorithm that displays the extracted SSEP after processing 12 successive unrejected sweeps. A unique filtering process employing time, frequency and eigen systems, in that order, was used to extract the SSEP from this set of 12 trials. The algorithm then detects, marks and records the P37 and N45 peaks using the first order differentials obtained through Walsh transformation. The monitoring using the algorithm was successful and proved conclusive to the clinical information through the different surgical procedures. Higher accuracy and faster execution time in determining the SSEP signals provides for a much improved and effective neurophysiological monitoring process.

关键词： execution time processing algorithm experimentation Surgery Operative Surgical Procedures Cyclin H Trials algorithms Signal averaging Filters signal processing

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Practical Considerations in Unsupervised Change Detection Using SAR Images

Practical Considerations in Unsupervised Change Detection Us...

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IEEE Annual Ubiquitous Computing, Electronics & Mobile Communication Conference (UEMCON)

作者： Bulent Ayhan Chiman Kwan Applied Research LLC Rockville USA

ISBN: (纸本)9781728138862

Change detection has a wide range of applications in hurricane damage assessment, urban growth monitoring, etc. It is well-known that synthetic aperture radar (SAR) can penetrate clouds and can work well under all weather conditions. However, SAR images also contain a lot of speckle noise that seriously affects change detection performance. In this paper, we focus on change detection using SAR images. In particular, we propose a new change detection algorithm that is applicable to both optical and SAR images. The detection performance of the algorithm was compared with a number of existing algorithms in the literature. Preliminary results using actual SAR images are encouraging. Most importantly, it was observed that effective change detection using SAR images require good denoising and post-processing algorithms in order to achieve decent performance.

关键词： geophysical image processing image denoising radar imaging remote sensing by radar speckle storms synthetic aperture radar Synthetic aperture radar Radar remote sensing Radar polarimetry Radar imaging Rescue image denoising Specific absorption rate SAFETY ANALYSIS REPORTS Speckle storms images processing algorithm Change detection algorithms

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THE SENTINEL-1 DATA PROCESSOR AND OPERATIONAL PRODUCTS

THE SENTINEL-1 DATA PROCESSOR AND OPERATIONAL PRODUCTS

引用

IEEE International Geoscience and Remote Sensing Symposium

作者： Nuno Miranda Betlem Rosich Cosimo Putignano ESA/ESRIN Serco

The Sentinel-1 Instrument processing Facility (IPF) is the sub-system of the Sentinel-1 Payload Data Ground Segment (PDGS) [ 1] responsible for the generation of the Level-1 and Level-2 products. This paper provides a... 详细信息

ISBN: (纸本)9781467311601

关键词： Sentinel-1 SAR Products Processor PROCESSOR Idiopathic Pulmonary Fibrosis SUB-SYSTEM processing algorithm Tea Payload

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A fully autonomous docking strategy for Intervention AUVs

A fully autonomous docking strategy for Intervention AUVs

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Oceans 2007 - Europe, vol.2

作者： L. Brignone M. Perrier C. Viala Underwater Systems Department IFREMER France Positioning Acoustics Vision and Robotics division of IFREMER's Underwater Department France CTO French SME Semantic TS sonar signal processing. e-mail: viala@semantic-ts.fr

ISBN: (纸本)9781424406340;142440634X

The development of effective control architectures for Intervention AUVs (I-AUV) is a very challenging task due to the inherent complexities of the environment and the necessity of the vehicle to come into contact with underwater structures without closed-loop supervision. Despite this, both the scientific and industrial communities are keen supporters of the development of I-AUV technology owing to the relevant cost saying opportunities they are potentially able to offer in a number of applications. In this article we describe a comprehensive control architecture designed to dock an I-AUV on a receiving structure, using sonar and video image processing alongside navigation data from conventional sensors. The approach is based on custom developed sonar and video processing algorithms and the results are validated in real-time conditions by means of Ifremer's experimental underwater vehicle VORTEX.

关键词： Control Architecture sonar Underwater structures Navigation data processing algorithm vehicle Intervention VIDEO IMAGES vortices dock Rumex obtusifolius Rumex acetosa

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A GPU-based ultrasound Phased-Array research system for non-destructive testing

A GPU-based ultrasound Phased-Array research system for non-...

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IEEE International Ultrasonics Symposium

作者： Marcin Lewandowski Mateusz Walczak Beata Witek Tomasz Steifer Department of Strength of Materials Institute of Fundamental Technological Research PAS Warsaw Poland

ISBN: (纸本)9781467398985

ultrasound Phased-Array (PA) systems for non-destructive testing (NDT) use standard beamforming for line-by-line image creation. New methods utilizing full-matrix capture (FMC) enable the application of advance processing algorithms, such as the total focusing method and multi-pass adaptive techniques for enhanced flaw visualization. The effective FMC data acquisition and its real-time processing require a very high data throughput and powerful computational resources. Most commercial PA systems support some form of FMC acquisition, but the limited external data bandwidth prevents this mode of operation from being useful. We have developed a fully programmable ultrasound research system capable of performing FMC data acquisition and image reconstruction with a high framerate. The ultrasound platform is supporting up to 192 parallel TX/RX electronics channels integrated with an embedded control PC and a GPU cluster for parallel processing. The implemented software libraries give the end-user control over TX/RX schemes, the acquisition process and signal processing algorithms. This all-in-one system is a fully flexible tool for the research and evaluation of novel Phased-Array FMC imaging methods and complex signal processing algorithms.

关键词： Ultrasonic imaging Graphics processing units Imaging Probes Real-time systems Firing Image reconstruction image reconstruction Ultrasonography real-time systems Nondestructive Testing FIRING Fixed Mobile Convergence Graphics processing Unit Probes PUBLIC ADDRESS SYSTEM Imaging Signal processing algorithms data throughput Ultrasonic Waves Software libraries processing algorithm

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A High-Accuracy Visual Marker Based on a Microlens Array

A High-Accuracy Visual Marker Based on a Microlens Array

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IEEE/RSJ International Conference on Intelligent Robotics and Systems

作者： Hideyuki Tanaka Yasushi Sumi Yoshio Matsumoto Intelligent Systems Research Institute National Institute of Advanced Industrial Science and Technology Tsukuba Ibaraki JAPAN

ISBN: (纸本)9781467317375

Visual markers are useful assistive tool for service robots. Existing planar visual markers have poor accuracy in pose estimation, especially in frontal direction. We solved this problem by a novel principle using a microlens array. The marker displays a changing moire pattern according to the visual-line direction. We can extract the pose information from the pattern by image processing using a single camera. The developed marker and the processing algorithm enable high-accuracy pose estimation even by observation from frontal direction. We verified its superiority to the conventional method by some validation tests. The marker is an extension of a marker we previously developed, and is more easily fabricated.

关键词： fabricated extension algorithm fabrication Microlenses Moire Patterns processing algorithm Service robots pose estimation Visualization algorithms Image processing

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A cost-effective solution for HD Maps creation

A cost-effective solution for HD Maps creation

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AmE 2017 - Automotive meets Electronics;8th GMM-Symposium

作者： Clemens Dannheim Markus Maeder Alexander Dratva Mattia Raffero Stefan Neumeier Christian Icking Objective Software GmbH Technische Hochschule Ingolstadt Research Centre FernUniversitat in Hagen

In the following paper, the authors propose an effective and reliable solution to the HD mapping problem. The solution is composed of relatively low-cost hardware components, if compared to the most advanced HD mapping solutions available on the market. The core of the solution is a robust post-processing algorithm that processes the point-cloud generated by a LiDAR, the frames collected by three cameras, the data coming from a GNSS receiver and an IMU, and the odometry data available on the car's CAN BUS. After the generation of the georeferenced point-cloud, the post processing algorithm extracts road geometries, objects and features to build HD maps. Such solution was developed and tested on our research car, and tested in Garching, near Munich, Germany. The results of the 3D mapping system are presented later, showing how the combination of low-cost technologies with a strong data fusion algorithm can provide exceptional performance.

关键词： HD Solutions processing algorithm Cars Motor buses Solution Data fusion maps creation MAPPING(MATHEMATICAL) mapping Road Geometry

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Adaptive MSER Reduced-Rank Decision Feedback Receiver for Large-Scale Multiple-Antenna Systems

Adaptive MSER Reduced-Rank Decision Feedback Receiver for La...

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WSA 2015;19th International ITG Workshop on Smart Antennas

作者： Boya Qin Yunlong Cai Rodrigo C. de Lamare Minjian Zhao Department of Information Science and Electronic Engineering Zhejiang University CETUC-PUC-Rio

In this paper, we propose a novel adaptive reducedrank decision feedback (DF) receiver strategy based on the minimization symbol-error-rate (MSER) criterion for largescale multiple-antenna systems. In this strategy, a reduced-rank method for general parameter estimation using an adaptive joint and iterative preprocessing, decimation and filtering (JPDF) scheme is proposed for DF receive processing. We design a pre-stored decimation matrix and develop conjugate gradient (CG) and modified conjugate gradient (MCG) algorithms for computing the parameters of the preprocessor and reduced-rank filter. A computational complexity analysis is carried out for the existing and proposed adaptive DF algorithms. Simulation results are provided and show that the proposed adaptive MSER-JPDF reduced-rank DF receive processing strategy can achieve a superior performance to conventional adaptive linear and DF receive processing algorithms.

关键词： Adaptive filtering Minimum-SER Reduced-rank techniques DF receiver Large-scale multiple-antenna adaptive filters DEUTERIUM FLUORIDES Self tuning decision feedback ANTENNA SYSTEM processing algorithm Program processors conjugate gradient Receivers

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A Dual Polarized UHF/VHF Honeycomb Stacked-Patch Array Antenna: Overview of An Enabling Technology for the MOSS Mission

A Dual Polarized UHF/VHF Honeycomb Stacked-Patch Array Anten...

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2008 IEEE Antennas and Propagation Society International Symposium (APSURSI 2008), vol.2

作者： Preston Partridge Mahta Moghaddam Yahya Rahmat-Samii Mark Haynes Line van Nieuwstadt Jacqueline Vitaz John Huang Vaughn Cable Aerospace Corporation Redondo Beach CA USA University of Michigan Ann Arbor MI USA University of California Los Angeles CA USA Jet Propulsion Laboratory Pasadena CA USA

ISBN: (纸本)9781424420414

The Microwave Observatory of Subcanopy and Subsurface (MOSS) is a conceptual mission addressing observations of soil moisture in the root zone and under substantial vegetation canopies [1]. As penetration depth through vegetation and ground is paramount in meeting the objectives of this mission, there is a need for using lower frequencies. In particular, the instrument proposed for this mission is a dual-band synthetic aperture radar (SAR) operating at VHF and UHF bands. To meet the 7-10 day temporal coverage requirement for this mission, a large (340-430 km) swath is required. To meet the additional requirement that the incidence angle be small and vary moderately over the swath implies that the platform altitude must be large enough so that a relatively small range beam-width fully covers the entire swath. To achieve the beam-widths resulting from these requirements, the width of the VHF aperture must be 11 m, while the width of the UHF aperture must be 3 m. The length of the antenna for both frequencies must be 30m. These simultaneous requirements dictate a mechanical implementation, which can only be practically deployed in space if the antenna aperture is shared by both of the frequencies. Among various potential concepts, application of a center-fed parabolic reflector antenna fed by a linear array feed is the most promising one [2]. The technology of the mesh reflector antennas with dimensions of up to 25-30m is developing steadily, as evidenced by the demonstrated Thuraya antenna [3]. Parametric studies on this 12-m antenna design have proven the same design to be scalable to 30m. The key challenge in our design lies in achieving the highly elliptical (30m×3m UHF, and 30m×11m VHF) illumination ratios required to form the SAR aperture using a center-fed reflector antenna. The achievable cross-pol isolation needs to be considered in the mission and processing algorithm design. Our "shared-aperture" design entails the illuminate of a 30-m reflector antenna such

关键词： Synthetic aperture radar Reflector antennas swath aperture antennas Very High Frequency Musci illumination UHF band angle of incidence apertures Ultrahigh frequencies Religious Missions Rhizosphere Root Zone processing algorithm

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