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IEEE International Conference on Signal processing, Communications and Computing (ICSPCC)

作者： Fei Wang Xingming Li Shanqing Hu Jie Wang Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China

ISBN: (纸本)9781509027095

The embedded high-speed and real-time signal processing systems are used widely in communication, navigation, sensing, measurement and control, etc. However, a high-bandwidth and high-flexibility remote communication interface is important when it comes to scenarios such as the mass data exchange between industrial computers and embedded systems. The 10Gigabit Ethernet (10GE) has been widely used as high-speed data transmission channel within/between systems in both embedded systems and industrial computer fields, because of its high transmission speed, low power consumption, reliable stability and good compatibility and other aspects of performance. In this paper, we designed a high-bandwidth remote communication interface between industrial computers and the core processors of the embedded signal processing system by adopting 10GE. As is verified by the experiments, the effective read/write bandwidth of the interface can reach up to 4216Mbps/6640Mbps, and it can support functions such as remote control, data interaction, program loading and remote debugging. Moreover, the paper provides promising references for the interactive communication among different kinds of systems and the flexible networking of embedded systems.

关键词： Bandwidth real-time systems Instruction sets Signal processing Field programmable gate arrays Ports (Computers) Computers

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Fresnel based frequency domain adaptive beamforming for large aperture distributed array radar

Fresnel based frequency domain adaptive beamforming for larg...

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IEEE International Conference on Signal processing, Communications and Computing (ICSPCC)

作者： Honggang Zhang Jian Luo Xinliang Chen Quanhua Liu Tao Zeng Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China

ISBN: (纸本)9781509027095

Distributed array radar is a significant radar system, which can not only improve radar detection capability and measurement accuracy, but also suppress mainlobe interference effectively. However, due to its equivalent large aperture, the plane wave assumption fails. What's worse, target signals arriving at each array may have the envelope migration problem, thus the traditional adaptive beamforming method becomes invalid. This paper proposes a Fresnel based frequency domain adaptive beamforming method for large aperture distributed array radar. Instead of plane wave model, it uses the Fresnel model based steering vector to improve accuracy. Meanwhile, it transforms the time domain signal to frequency domain, and using the traditional adaptive beamforming method for each frequency point respectively. Finally, it accomplishes the frequency domain adaptive beamforming by an inverse Fourier transform (IFFT). In result, this method could eliminate the envelope migration problem effectively. Simulations illustrate the effectiveness of the proposed method.

关键词： Frequency-domain analysis Radar Apertures Adaptation models Array signal processing Interference Adaptive arrays

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Permanent scatterers in space-surface bistatic SAR using Beidou-2/Compass-2 as illuminators: Preliminary experiment results and analysis

Permanent scatterers in space-surface bistatic SAR using Bei...

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European Radar Conference (EURAD)

作者： Tao Zeng Tian Zhang Weiming Tian Cheng Hu Feifeng Liu Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China

ISBN: (纸本)9781509015139

Beidou-2/Compass-2 inclined geosynchronous orbit satellites have short revisit time, which provides possibility for bistatic SAR differential interferometry application. But the orbit is not accurately repeated and the baseline grows with the time, which can result in deteriorating spatial coherence coefficient and may invalidate the tradition differential interferometry method. In order to implement accurate deformation monitoring, permanent scatterer technique could be utilized. However, the existence of permanent scatterers in this kind of system has not been demonstrated so far. In this paper, validation experiments are presented to validate the feasibility for SS-BiSAR differential interferometry using permanent scatterers. The echoes of urban region in 10 different days with time span of 12 days are collected and processed. The coherences coefficients between different days and the amplitude dispersion are analyzed. The result shows that under the amplitude dispersion threshold of 0.25 many pixels can be identified as permanent scatters. Thus the existence of permanent scatterers in this kind of system is demonstrated, showing its potential to implement local area deformation monitoring.

关键词： Satellites Interferometry Synthetic aperture radar Coherence Dispersion Imaging

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A method for moving target detection based on airborne multi-aspect SAR system

A method for moving target detection based on airborne multi...

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IEEE International Conference on Signal processing, Communications and Computing (ICSPCC)

作者： Xin Zhao Xin Liao Zegang Ding Wenbin Gao Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China

ISBN: (纸本)9781509027095

Conventional methods of moving target detection, such as DPCA, GMTI have difficulties in detecting low speed target and showing the movement route. Multi-aspect airborne SAR can illuminate the same scene from different directions to get all-round scattering features of scene. In this paper, a method of moving target detection based on multi-aspect SAR images is proposed. This method can extract the change part from multi-aspect images to estimate the velocity and show the movement route. There is geometric correction, image registration and change detection along the process. As the key part of the detection, an improved image registration method named WT-SIFT is proposed, which combines Wavelet Transform (WT) with Scale-Invariant Feature Transform(SIFT). Finally, the validity of this method of moving target detection is demonstrated by an airborne multi-aspect SAR experiment.

关键词： Synthetic aperture radar Image registration Object detection Wavelet transforms Speckle Image resolution

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A novel TOA estimation method for unknown signal based on intra-pulse correlation accumulation

A novel TOA estimation method for unknown signal based on in...

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IEEE International Conference on Signal processing, Communications and Computing (ICSPCC)

作者： Jiacen Xu Zhongyi Wang Quanhua Liu Lixiang Ren Beijing Key Laboratory of Embedded Real-time Information Processing Technology School of Information and Electronics Beijing Institute of Technology Beijing China

ISBN: (纸本)9781509027095

This paper presents a novel low complexity time-of arrival (TOA) estimation method for unknown intra-pulse modulated signal under low SNR condition. The received signal is firstly pre-processed by delayed conjugate multiplication to reduce the intra-pulse modulation and get a rough range of the signal. Then a novel intra-pulse correlation accumulation method is applied to achieve a precise estimation of rising and falling edge. Simulations are conducted to show the feasibility of the method and evaluate the performance of estimation. Compared with existing methods, this novel method can achieve a better estimation result.

关键词： Estimation Signal to noise ratio Correlation time of arrival estimation Smoothing methods Frequency modulation

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Dem-assisted back-projection algorithm in high resolution geosynchronous SAR imaging

Dem-assisted back-projection algorithm in high resolution ge...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： YuanHao Li XiChao Dong Kai Cui Cheng Hu DongYang Ao Teng Long School of Information and Electronics Beijing Institute of Technology Beijing Beijing Key Laboratory of Embedded Real-time information Processing Technology Beijing

Since geosynchronous synthetic aperture radar (GEO SAR) has curved trajectories, back-projection algorithm (BPA) greatly fits for its imaging. However, for a scene with height variation, the reference range based on the fixed-height imaging grid under curved trajectories is inaccurate in azimuth back-projection. Resultantly, the GEO SAR image quality will be obviously deteriorated in high resolution imaging. To address the issue, this paper proposed the digital elevation model (DEM)-assisted BPA to realize the accurate high resolution GEO SAR imaging for the scene with height variation. DEM information is utilized to construct the imaging grid in the new method for generating the accurate reference range. Simulation results validate that the proposed method achieves good imaging performance for the scene with height variation.

关键词： Imaging Azimuth Image resolution Synthetic aperture radar Trajectory Radar polarimetry Orbits

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MICRO-DOPPLER EXTRACTION FROM ISAR IMAGE

MICRO-DOPPLER EXTRACTION FROM ISAR IMAGE

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IEEE International Conference on Acoustics, Speech and Signal processing

作者： Feng Li Jun Cao Lixiang Ren Teng Long Beijing Key Laboratory of Embedded Real-Time Information Processing Technology School of Information and Electronics Beijing Institute of Technology Beijing China

ISBN: (纸本)9781479999897

The micro-Doppler is an effective tool for target recognition. It is hard to detect micro-Doppler induced by vibration for its small value. In our system, phase-modulated stepped-frequency waveform is used. The method of matching pursuit (MP) is introduced to compensate translation. Translation trajectory is approximated by Chebyshev polynomial to improve approximation accuracy under low signal-to-noise ratio. The parameters in the polynomial are estimated by MP. To improve the performance of MP, simulated annealing is used. The operation of translation parameters estimation is performed in frequency domain before pulse compression. After translation compensation and pulse compression, Doppler component induced by rotation is mitigated by phase fitting. After compensation of translation and rotation, micro-Doppler is extracted from the result of motion compensation based on vibration model. Simulation and experiment data are used to testify our method.

关键词： Chebyshev polynomial matching pursuit micro-Doppler simulated annealing stepped-frequency waveform

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Future Development Trend of Multimedia Network

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IOP Conference Series: Materials Science and Engineering 2018年第1期466卷

作者： Li Huang Kai Zhang Wei Hu Chengcheng Li College of Computer Science and Technology Wuhan University of Science and Technology Hubei Wuhan 430081 China Hubei Province Key Laboratory of Intelligent Information Processing and Real-time Industrial System Wuhan University of Science and Technology Hubei Wuhan 430081 China Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan University of Science and Technology Hubei Wuhan 430081 China

With the rapid development of computer network, multimedia technology has gradually spread throughout all aspects of people's life. This article, based on the concept and characteristics of multimedia, expounds the application of multimedia technology and the trend of future development. It makes a heavy analysis of multimedia teaching and analyses the meaning and advantage of multimedia teaching.

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Author Correction: Micro-Doppler measurement of insect wing-beat frequencies with W-band coherent radar

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Scientific reports 2018年第1期8卷 4050页

作者： Rui Wang Cheng Hu Xiaowei Fu Teng Long Tao Zeng School of Information and Electronics Beijing Institute of Technology Beijing 100081 China. Department of Electronic Engineering Tsinghua University Beijing 100084 China. School of Information and Electronics Beijing Institute of Technology Beijing 100081 China. hucheng.bit@***. State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant Protection Chinese Academe of Agricultural Sciences Beijing 100193 China. Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing 100081 China.

A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has not been fixed in the paper.

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GNSS-based BiSAR imaging using modified range migration algorithm

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Science China(information Sciences) 2015年第8期58卷 144-156页

作者： ZENG Tao LIU FeiFeng ANTONIOU Michail CHERNIAKOV Mikhail Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology School of Electronic Electrical and Systems Engineering University of Birmingham

This paper proposed a new focusing approach for the bistatic SAR systems with a GNSS(Global Navigation Satellite System) satellite as the transmitter. Because of the long integration time the inherited curvature of the transmitter’s trajectory was adopted and the spatial variance of the equivalent velocity was derived under the principal of equivalent slant range model in the system signal model. The proposed focusing approach consists of two-step processing. Firstly, the general Doppler phase from constant velocity of the echo data is focused by modified Stolt mapping. Secondly, the residual nonlinear Doppler phase due to velocity variation is compensated by means of block-processing-based adaptive phase compensation to achieve large scene focusing. The simulation and experimental results validate the proposed algorithm in GNSS-based Bi SAR systems.

关键词： GNSS-based Bi SAR equivalent slant range model curvature of trajectory two-step processing modified Stolt mapping

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