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

共 968 条记录，以下是901-910 订阅

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Metallographic image segmentation based on ridge detection and region-merger

Metallographic image segmentation based on ridge detection a...

引用

2015 3rd International Conference on Soft Computing in information Communication technology(SCICT 2015)

作者： Yan Chen Jianxun Chen School of Computer Science and Technology Wuhan University of Science and Technology Key Laboratory of Intelligent Information Processing and Real-time Industrial System

Watershed algorithm was widely applied to have a better recognition and segmentation for the grains in metallographic image,due to its fuzziness,discontinuity and incompleteness around the boundary of metallographic *** this paper,in order to solve the defect of traditional watershed algorithm,metallographic image segmentation based on ridge detection and region-merger was *** the method of ridge region growing reconstructed the discontinuous ridge,making the most pseudo-blobs being marked in this ***,a method of similar adjacent region merging was proposed which could merge the pseudo-blobs,increasing merging *** experiments demonstrate that the proposed algorithm was able to solve over-segmentation and under-segmentation to the greatest extent,which could greatly increase the accuracy of segmentation of metallographic image.

关键词： Metallographic image segmentation based on ridge detection and region-merger image

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FM-CW signal phase error analysis and compensation

FM-CW signal phase error analysis and compensation

引用

IET International Radar Conference 2015

作者： Y. Deng X. Guo R. Wang C. Hu T. Zeng Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing P.R. China Army Aviation Institute Beijing P.R. China

ISBN: (纸本)9781510822023

Frequency Modulated Continuous Wave (FM-CW) waveform has been widely used in radar range measuring, speed measuring and imaging. However, the performance of matched filtering for range compression is usually degraded by the nonideal factors in the real radar system, such as the frequency modulation ratio error and the unstable sampling clock. In this paper, an iterative method is proposed to compensate these phase errors induced by the nonideal factors based on the entropy minimum. The principle of the proposed iteration is to construct a series of local quadratic curves to gradually approach the minimum. Finally, both simulated and experimental datasets are used to validate the feasibility and effectiveness of the proposed method.

关键词： De-chirp Entropy minimum FM-CW Phase compensation Phase error analysis

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Design of a configurable fixed-point FFT processor

Design of a configurable fixed-point FFT processor

引用

IET International Radar Conference 2015

作者： Chen Yang Yi-zhuang Xie Liang Chen He Chen Yi Deng Beijing Key laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Arlington VA USA

ISBN: (纸本)9781510822023

In this paper, we focus on the widely-used radix-2 2 Decimation-In-Frequency (DIF) Fast Fourier Transform (FFT) algorithm. A variable-length, controllable-precision FFT processor is proposed. The processor can perform 16, 64, 256 and 1024 point FFT/IFFT and provide flexible wordlength scaling modes for different FFT stages. Thus, the processor is suitable for different precision and FFT length requirements in various applications. Aiming at high throughput performance, single-path delay feedback (SDF) pipeline architecture is adopted. The design is testified on Xilinx Virtex6 xc6vcx240t FPGA. Accordingly, we make a clear comparison between the proposed design and Xilinx FFT v7.1. Our design achieves better signal-to-quantizationnoise ratio (SQNR) property and shorter pipeline latency. Meanwhile, the occupied resource is approximately the same. Moreover, SQNR performance of different FFT length and wordlength scaling modes is analysed.

关键词： FFT Configurable Fixed-point FPGA

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An improved DEM reconstruction method based on shortest sub-interval in MF-InSAR

An improved DEM reconstruction method based on shortest sub-...

引用

IET International Radar Conference 2015

作者： Tiandong Liu Shiqi Ge Zegang Ding Qi Zhang Teng Long Beijing Key Laboratory of Embedded Real-time Information Processing Technology Radar Research Lab. School of Information and Electronics Beijing Institute of Technology Beijing 100081 China Nanjing Research Institute of Electronics Technology Nanjing 210039 China

Interferometric synthetic aperture radar (InSAR) can realize the elevation extraction of the target. Through increasing the degree of freedom (DOF) during the topography calculation, multi-frequency InSAR technology can further achieve high-accuracy elevation reconstruction in steep terrain. Although the maximum likelihood estimation (MLE) method is widely used in the signal processing of multi-frequency InSAR, its performance can be influenced by phase noise. This paper proposes a creative algorithm which combines the maximum likelihood elevation estimation with the shortest sub-interval seeking operator (SSIS-MLE). It statistically averages the elevation estimation results of the MLE with class histogram, so that efficiently excludes the error estimation. Simulation results verify that this method not only maintains the high calculation efficiency of traditional MLE method, but also guarantees the high accuracy of elevation estimation.

关键词： MLE Multi-frequency InSAR efficiency the shortest sub-interval maximum likelihood estimation Synthetic aperture radar signal processing multiple-frequency Phase noise

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The squinted-looking SAR real-time imaging based on multi-core DSP

The squinted-looking SAR real-time imaging based on multi-co...

引用

IET International Radar Conference 2015

作者： Congxin Li Long Jie Lei Cui Di Yao Department of Electronic Engineering Beijing Institute of Technology 100081 Beijing China Science and technology on information system engineering laboratory 100038 Beijing China Beijing Key Laboratory of Embedded Real-time Information Processing 100081 Beijing China Key Laboratory of Electronic and Information Technology in Satellite Navigation 100081 Beijing China

ISBN: (纸本)9781510822023

This paper presents a use of multi-core DSP TMS320C6678 for the squinted-looking synthetic aperture radars (SARs) real-time signal processing method. This paper first briefly introduces the squinted-looking SAR algorithm and analyzes the signal processing by use of spectral analysis (SPECAN). Then, according to the requirement of squinted-looking SAR real-time imaging system, the high performance TI multi-core DSP TMS320C6678 is used for realizing the imaging algorithm through the virtual single-node technology for data transmission and interaction and the parallel approach to data processing. Finally, the flight experiment is carried out and the results show that the virtual processing method meets the requirements of the real-time imaging based on the multi-core DSP hardware platform effectively.

关键词： real-time Squinted-looking SAR TMS320C6678 DSP Virtual single-node

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Fixed-point simulation technology for SAR real-time imaging system

Fixed-point simulation technology for SAR real-time imaging ...

引用

IET International Radar Conference 2015

作者： Xin Zhou Yi-zhuang Xie Chen Yang Qing Du Yi Deng Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing 100081 China Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Arlington VA USA

ISBN: (纸本)9781510822023

In this paper, a fast fixed-point simulation technology is proposed for a multi-channel synthetic aperture radar (SAR) imaging system. The overall computations in the SAR imaging algorithm is explicitly analysed. FFT operations account for most memory consumption in the imaging flow. Accordingly, a fixed-point FFT algorithm is adopted due to the trade-off between precision and memory occupation of the FPGA implementation. Furthermore, this paper describes an optimized word-length configuration method based on theoretical analysis of architecture of Radix-22 FFT. This methodology is verified in a SystemC development environment due to its superiority of fast and bit-accurate system-level simulation capability. Finally, the proposed SystemC based fixed-point imaging algorithm and the Matlab based floating-point imaging algorithm are both conducted to process point array target raw data. Peak side-lobe ratio (PSLR) and integrated side-lobe ratio (ISLR) is evaluated. Experimental results indicate that profiles in the two cases do not differ greatly, which validates that the proposed fixedpoint algorithm with less resources occupation has comparable accuracy and can meet system requirements.

关键词： SAR SystemC fixed-point arithmetic real-time imaging system-level simulation

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An azimuth weighting method of slide-spotlight SAR based on subaperture chirp scaling algorithm

An azimuth weighting method of slide-spotlight SAR based on ...

引用

IET International Radar Conference 2015

作者： Bozheng Shu Yinhui Xu Zegang Ding Yu Zhu Beijing Key Laboratory of Embedded Real-time Information Processing Technology Radar Research Lab. School of Information and Electronics Beijing Institute of Technology Beijing 100081 China Beijing Institute of Spacecraft system Engineering CAST Beijing 100094

Different azimuth targets have different Doppler centroid and different time support domain in slide spotlight synthetic aperture radar. Thus, it is hard to weighting window on the echo in slide spotlight mode. This paper proposed an azimuth weighting method of slide spotlight SAR based on subaperture chirp scaling algorithm. Firstly, the subaperture number of the algorithm is discussed based on the shift of Doppler centroid and the pulse repetition frequency(PRF). Secondly, the range cell migration and the remove of the azimuth phase of each subaperture are processed by chirp scaling algorithm independently. At last, the data of each subaperture is combined together, and the azimuth weighting window is applied after an azimuth de-ramp process of the combined data. The computer simulations verify the validity of the proposed algorithm.

关键词： azimuth weighting window slide spotlight synthetic aperture radar subaperture chirp scaling spotlight synthetic aperture radar azimuth Weighting methods Chirp modulation Cell Migration Cell Locomotion algorithms Echoes Scale formation Computer Simulation Slide Slide

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A new region growing based method for ship detection in high-resolution SAR images

A new region growing based method for ship detection in high...

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IET International Radar Conference 2015

作者： Chonglei Wang Chen Li Fukun Bi Liang Chen Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing 100081 China Institute of Remote Sensing Information Beijing 100192 China School of Electronic Information Engineering North China University of Technology Beijing 100144 China

ISBN: (纸本)9781510822023

High-resolution SAR are of great value in remote sensing nowadays. To make good use of the characteristics of high-resolution SAR images to detect targets, we present here a region growing method. First, we calculate a threshold according to the given PFA to pick up bright pixels as the seeds. Second, we define the criteria which is mainly based on the relationship between pixels in a high -resolution SAR image and then execute the growing process. Finally, we exclude false alarms according to some geometry features. The experiments and results show that it is a constructive and effective way using region growing algorithm to detect ships in high-resolution SAR images.

关键词： Region Growing SAR Target Detection

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A compensated method for GEO SAR attitude trembling based on minimum entropy

A compensated method for GEO SAR attitude trembling based on...

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IET International Radar Conference 2015

作者： Bin Xiong Bozheng Shu Zegang Ding Qingjun Zhang Beijing Key Laboratory of Embedded Real-time Information Processing Technology Radar Research Lab. School of Information and Electronics Beijing Institute of Technology Beijing 100081 China Beijing Institute of Spacecraft system Engineering CAST Beijing 100094

ISBN: (纸本)9781510822023

In this paper, the effect of the satellite yawing, pitching and rotating to the antenna beam pointing is analyzed. At the same time, how the antenna beam pointing error affecting the imaging quality is interpreted. The most significant effect is that the pointing error will lead to paired echo in the SAR image and the paired echo may submerge the weak target. So in this paper we will present a method based on minimum entropy to compensate the beam pointing error and eliminate the paired echo. Finally, we present some simulation to verify the validity of the compensated method.

关键词： attitude trembling back projection minimum entropy paired echo

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Research on BP imaging algorithm parallelization using C6678 DSPS

Research on BP imaging algorithm parallelization using C6678...

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IET International Radar Conference 2015

作者： Jiayun Zhao Yuan Yuan Jinghua Wang Ye Jin Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing China North China Institute of Computing Technology Beijing China Beijing institute of spacecraft system engineering China academy of space technology Beijing China

ISBN: (纸本)9781510822023

Compared to the traditional SAR imaging algorithm, Back Projection(BP) algorithm is an accurate point-by-point imaging radar algorithm based on time-domain, with simple principle and without any approximation error in the imaging process. However, because of intensive computation and low efficiency, it's a new challenge to storage to capacity, throughput and processing ability of DSPs, a single DSP is not enough to meet these demands. So a parallel implementation method of BP algorithm based on TMS320C6678 DSP is proposed in this *** put forward a large point FFT multi-core parallel processing method on 2/4/8 cores what is frequently used in BP algorithm, and a multi-core synchronization method based on distributed memory. Finally using the measured data, we verify the parallel method can greatly enhance the multi-core parallelism, and the real-time performance of BP algorithm has been significantly improved.

关键词： BP imaging algorithm large point FFT multi-core parallel processing multi-core synchronization

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