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检索条件"机构=Beijing Key Laboratory of Embedded•Real-Time Information: Processing Technology"

共 577 条记录，以下是541-550 订阅

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Bistatic SAR imaging processing and experiment results using BeiDou-2/Compass-2 as illuminator of opportunity and a fixed receiver

Bistatic SAR imaging processing and experiment results using...

引用

Asian and Pacific Conference on Synthetic Aperture Radar (APSAR)

作者： Tao Zeng Tian Zhang Weiming Tian Cheng Hu Xiaopeng Yang Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing P.R. China

ISBN: (纸本)9781467372985

Global Navigation Satellite System (GNSS) provides opportunities for passive radar applications. This paper reports progress in space-surface bistatic synthetic aperture radar (SS-BiSAR) using Beidou-2 as transmitters of opportunity and a fixed ground-based receiver. Experiment is described and the obtained SAR image is presented and interpreted in detail. Results show that BiSAR using beidou-2 as illuminator is able to reflect different types of targets and SS-BiSAR using GNSS as illuminator of opportunity is potential to realize local area monitoring.

关键词： Synthetic aperture radar Global Positioning System Receivers Satellites Synchronization Radar imaging Spaceborne radar

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The method of multi-channel phased array radar squint SAR system design

The method of multi-channel phased array radar squint SAR sy...

引用

IET International Radar Conference 2015

作者： Lei Cui Jing Gao Zixiao Wang Di Yao Department of Electronic Engineering Beijing Institute of Technology Beijing China Beijing key Laboratory of Embedded Real-time Information Processing Technology

ISBN: (纸本)9781510822023

Multi-channel phased array radar has the following advantages: detection multiple target, far work distance, anti-interference capability, and sensitive response, etc. The squint SAR (Synthetic Aperture Radar) is an effective means of detection in complex background in all-weather and all-day. Multi-channel phased array radar needs the consistency of amplitude and phase. The design of the system parameter should focus on the problem of spatial variability properties of PRF and resolution design. This paper introduces the composition analysis of multi-channel phased array radar, consistency of amplitude and phase, and the design of radar system parameters. The result of flight experimentation verifies the method of system design.

关键词： Consistency of amplitude and phase Flight experimental Multi-channel phased array radar SAR System design

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Improved two-probe approach for in-circuit measurement based on three-port network pre-calibration

Improved two-probe approach for in-circuit measurement based...

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Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

作者： Xing-Ming Li Shan-Qing Hu Kye-Yak See Kang-Rong Li Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing Institute of Technology China Nanyang Technological University Singapore

In high-speed electrical designs, the in-circuit characteristics of the components are usually obtained from in-circuit measurements as the references for designers. The two-probe approach (TPA) is one of in-circuit measurement approaches by adopting the inductive coupling effects of the current probes, and it gains good accuracy below 30MHz. In this paper, we propose an improved two-probe approach (ITPA) by introducing network parameters. Rather than modeling the measurement setup using equivalent circuits in the TPA, the proposed ITPA models it by using a three-port network, and pre-calibrates it before real measurements. By comparing the results measured from ITPA with those from the impedance analyzer (IA), it is proven that, the ITPA extends the highest measurement frequency to 100MHz from 30MHz (with the TPA), while maintaining allowable accuracy; besides, the ITPA avoids the trial-error pre-calibrations required in the TPA.

关键词： Impedance measurement Probes Ports (Computers) Impedance Current measurement Frequency measurement Resistors

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Design of a large point FFT processor with configurable transform length

Design of a large point FFT processor with configurable tran...

引用

IET International Radar Conference 2015

作者： Yu Xie Yang-kai Feng Chen Yang Yi-zhuang Xie He Chen Beijing Key laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China Shanghai institute of satellite engineering

ISBN: (纸本)9781510822023

In this paper, a scheme of a large point FFT processor with configurable transform length is proposed. To achieve a pipelined structure, the proposed scheme is designed by Radix-2 decimation-in-frequency (DIF) FFT algorithm with Single-path Delay Feedback (SDF) architecture. A prototype is implemented on Xilinx Virtex-7 XC7VX690T FPGA, which can compute 16~128K FFT at a speed as high as *** scheme is superior to existing technologies, due to its ability to process a continuous-flow input sequence and its prospect for real-time, configurable transform length applications.

关键词： FFT configurable large point real-time FPGA

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A 3-D robust detail preserving anisotropic diffusion for speckle reduction in 3-D cattle follicle ultrasound image

A 3-D robust detail preserving anisotropic diffusion for spe...

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作者： Liu, Jun Jiang, Hongwei Liu, Xiaoming School of Computer Science and Technology Wuhan University of Science and Technology Wuhan China Hubei Province Key Laboratory of Intelligent Information Processing and Real-time Industrial System Wuhan China

In this paper, an anisotropic diffusion filtering algorithm is proposed by modifying the diffusion coefficient and the instantaneous coefficient of variation (ICOV). This algorithm can reduce the speckle in the ultrasound image effectively and well preserve an image's edges and details compared with the 3-D speckle reducing anisotropic diffusion filtering (3DSRAD). We applied this algorithm on a real 3-D ultrasound image and the result shows that the modified algorithm is less sensitive to the number of iterations than conventional 3D speckle, thus reducing anisotropic diffusion filtering. Copyright © 2015 Inderscience Enterprises Ltd.

关键词： Speckle

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Strategy of spectrum reconstruction in stepped-frequency SAR imaging

Strategy of spectrum reconstruction in stepped-frequency SAR...

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IET International Radar Conference 2015

作者： Wenbin Gao Yansu Guo Luosi. Liu Zegang Ding Beijing Key Laboratory of Embedded Real-time Information Processing Technology Laboratory of Radar Technology School of Information and Electronics Beijing Institute of Technology Beijng 100081 Beijing Institute of Remote Sensing Information Beijng 100081

High range resolution of synthetic aperture radar (SAR) can be obtained by using the stepped-frequency technique, but it is still a problem how spectrum reconstruction methods can be combined correctly and effectively with SAR imaging algorithms. This paper analyzes the feasibilities of all the potential combinations between spectrum reconstruction methods and SAR imaging algorithms, and the optimal combinations are proposed. The simulation results verify the analysis in this paper.

关键词： Imaging algorithms optimal combination method spectrum reconstruction stepped-frequency synthetic aperture radar (SAR) Radar polarimetry Synthetic aperture radar Distance resolution Reconstruction algorithm Spectra

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The guided image filtering for speckle reduction in SAR images

The guided image filtering for speckle reduction in SAR imag...

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IET International Radar Conference 2015

作者： Hao Shi Liang Chen Zhi-hong Mai He Chen Fu-kun Bi Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing 100081 China College of Information Engineering North China University of Technology Beijing 100144 China

ISBN: (纸本)9781510822023

The reduction of SAR image speckle noise is an important issue. However, the existing denoising methods may cause the resolution and details loss. This paper proposes a SAR image speckle reduction method based on the guided image filtering. This method combines the edge-preserving property of guided filtering and can maintain the detail information meanwhile suppressing the speckle. Experimental results show that the proposed method can effectively reduce speckle and keep the polarization information, point targets and texture structure. Meanwhile, it is able to handle large SAR images simply and effectively.

关键词： SAR image guided image filtering remote sensing speckle reduction

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A novel watershed segmentation method for SAR image

A novel watershed segmentation method for SAR image

引用

IET International Radar Conference 2015

作者： Jinjing Shen Long Ma Liang Chen He Chen Ying Yu Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing 100081 China School of Information Science and Engineering Yunnan University Kunming 650091 China

ISBN: (纸本)9781510822023

This paper proposes a new SAR (Synthetic Aperture Radar image watershed segmentation method based on contextual statistical features analysis. This method firstly homogenizes all the sub-blocks of image by analysing statistical features, and then extracts the feature of each homogenized sub-block. Finally, the watershed area of this image can be segmented by means of Otsu algorithm. The experimental results show that our proposed method outperforms the conventional methods in both accuracy and time consuming.

关键词： Context analysis Otsu method SAR image Statistical characteristic Watershed segmentation

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Segmentation of oil spills in SAR image based on improved CV model

Segmentation of oil spills in SAR image based on improved CV...

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IET International Radar Conference 2015

作者： Wenjie Tie Chonglei Wang Fukun Bi Hao Shi Xu Zhang He Chen Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing 100081 China School of Electronic Information Engineering North China University of Technology Beijing 100144 China

Extracting the oil spills in SAR images has been challenged by the spatial heterogeneity caused by the speckles. In this paper, we present a novel variational formulation based on the local characteristics of SAR images for CV mode. The proposed method is aimed to solve the segmentation problem caused by SAR image speckles. Compared with the traditional CV model, the performance of the improved CV model is verified by plenty of real airborne SAR images and the experimental results on the real data show its efficiency and accuracy. By presenting various results in the classical threshold segmentation method and Markov random field method respectively, we conclude that the improved CV model is effective and accurate.

关键词： CV model SAR image local characteristics oil spills segmentation speckles oil spill Radar polarimetry Rescue Synthetic aperture radar Specific absorption rate SAFETY ANALYSIS REPORTS CATACLYSMIC VARIABLE STARS images Speckle

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Context segmentation of oceanic SAR images: Application to oil spill detection

Context segmentation of oceanic SAR images: Application to o...

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IET International Radar Conference 2015

作者： Yin Zhuang He Chen Fukun Bi Long Ma Beijing Key laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing 100081 China School of Electronic Information Engineering North China University of Technology Beijing 100144 China

ISBN: (纸本)9781510822023

This paper introduces an algorithm based on the context of MRF (Markov random field) model, and this method achieved oil spilling detection and segmentation. In this paper, the two important elements are initial labelling field and potential parameter estimation. The algorithm model chooses optical pyramid of saliency map as initial label field and Ising model as segmentation function. Using the GMM (Gaussian Mixture Model) and MAP (Maximum a Posterior) get local optimal result by ICM (Iteration Condition Model) method. This paper is also deeply researching the potential parameter which is the impact factor in segmentation function. Through studying the relationship between potential function and every scale-levels of saliency pyramid, the paper gets the better result which is more accuracy segmentations and keeping more texture information. The series experiments prove this method having false alarming rejection and noise suppression function in Oceanic SAR images.

关键词： feature field labelling field optical pyramid of saliency map potential parameter segmentation function

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