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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411-420 订阅

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A Clutter Suppression Method for Shallow Surface Penetrating Imaging Radar

A Clutter Suppression Method for Shallow Surface Penetrating...

引用

International Congress on Image and Signal processing, BioMedical Engineering and Informatics

作者： Jinbing Li Haibo Liu Guowen Min Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology China

ISBN: (纸本)9781509037117

The suppression of antenna direct coupled wave and medium surface wave is an very important step in the signal processing of the shallow surface penetrating imaging radar. For shallow buried targets, due to its buried depth is less than the depth resolution, the traditional clutter inhibition method based on the mean cancellation and distance gating is not applicable. In addition, in order to improve the scanning efficiency, array antennas are usually used to realize the simultaneous sampling to multiple spatial position echoes. The discordance of amplitude and phase between the multi-channel of the antenna array also makes the clutter suppression effect of the mean cancellation algorithm not ideal. In this paper, an adaptive suppression method for array antenna based on the maximum entropy gradient is proposed. Experimental results prove that this method can effectively repress the two kinds of clutter and improve the image quality effectively. The processing results using measured data prove this method effective in clutter suppression.

关键词： compensation phase penetrating imaging radar shallow buried clutter suppression entropy theory

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Radar HRRP target recognition based on Gradient Boosting Decision Tree

Radar HRRP target recognition based on Gradient Boosting Dec...

引用

International Congress on Image and Signal processing, BioMedical Engineering and Informatics (CISP-BMEI)

作者： Suixue Wang Jinbing Li Yanhua Wang Yang Li Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China

ISBN: (纸本)9781509037117

Radar High Resolution Range Profile (HRRP) represents the radial distribution of target scattering centers on radar line of sight, which infers something about target structure signatures. In this paper, the method of HRRP target recognition based on Gradient Boosting Decision Tree (GBDT) is proposed and the method how to choose model parameters is investigated. The experimental results from measurement data have shown that GBDT can achieve better recognition results and high calculation efficiency than SVM and Naive Bayes classifier.

关键词： Boosting Decision trees Training Predictive models Support vector machines Scattering Niobium

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Remote communication interface of embedded system based on 10Gigabit Ethernet

Remote communication interface of embedded system based on 1...

引用

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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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...

引用

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

Fresnel based frequency domain adaptive beamforming for larg...

引用

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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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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Task Scheduling of Improved time Shifting Based on Genetic Algorithm for Phased Array Radar

Task Scheduling of Improved Time Shifting Based on Genetic A...

引用

2016 IEEE 13th International Conference on Signal processing（ICSP2016）

作者： Lu Hao Xiaopeng Yang Shangkun Hu Beijing Key Laboratory of Embedded Real-time Information Processing Technology School of Information and Electronics Beijing Institute of Technology

Task scheduling is an important problem of radar resource management. Because of the limited resources constraints, an effective scheduling algorithm is necessary to allocate the resources of radar system. Traditional genetic algorithm(GA) can improve the time utilization rate(TUR) and scheduling success rate(SSR), but the time shifting rate(TSR) will increase at the same time, which goes against the desired time principle and influences timeliness of radar system. In order to decrease the TSR, a genetic algorithm of improved task model is proposed. In this improved GA, the time shifting function is created, and added to the scheduling gain function, which can control the TSR. The simulation results prove that improved GA not only decreases time TSR, but also stabilizes the TUR and SSR of the system, compared with traditional GA.

关键词： component task scheduling genetic algorithm scheduling gain task model

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DRFM Range False Target Cancellation Method Based on Slope-Varying LFM Chirp Signal

DRFM Range False Target Cancellation Method Based on Slope-V...

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2016 IEEE 13th International Conference on Signal processing（ICSP2016）

作者： Li Wei Yang Xiaopeng Zhou Chao Li Shuai Ning Liyue Beijing Key Laboratory of Embedded Real-time Information Processing Technology School of Information and ElectronicsBeijing Institute of Technology

Range false target created by Digital Radio Frequency Memory(DRFM) repeat jammer is a very common deception jamming in Electronic Counter Measures(ECM). In this paper, a jamming cancellation method based on Slope-Varying Linear Frequency Modulation(LFM) chirp signal is proposed to suppress this kind of jamming signal. In the proposed method,the radar firstly transmits LFM chirp signal with varying slope at each pulse repletion intervals(PRIs). In the following, the jamming signal is reconstructed by using the parameters of range false target, which are estimated from marched-filter ***, DRFM range false target can be cancelled out by subtracting received signal from reconstructed jamming *** effectiveness of the proposed method is verified by simulations

关键词： electronic counter-countermeasures range false target digital radio frequency memory Slope-Varying

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Modified Omega-K Algorithm for Ground-Based FMCW SAR Imaging

Modified Omega-K Algorithm for Ground-Based FMCW SAR Imaging

引用

2016 IEEE 13th International Conference on Signal processing（ICSP2016）

作者： Guo,Shouchang Dong,Xichao Beijing Key Laboratory of Embedded Real-time Information Processing Technology School of Information and ElectronicsBeijing Institute of Technology

The combination of ground-based synthetic aperture radar(GB-SAR) and frequency-modulated continuouswave(FMCW) technology produces a high-resolution remote sensing system that is superior in deformation measurement. However, conventional focusing algorithms should be modified for GB-SAR geometry and FMCW signals. In this paper, an accurate GB FMCW SAR signal model is constructed, and a modified Omega-K algorithm is proposed to achieve optimal imaging. The algorithm is validated by simulation results.

关键词： GB-SAR FMCW signal model modified OmegaK algorithm

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Demonstration experiments of geosynchronous SAR focusing and interferometry using GNSS satellites

Demonstration experiments of geosynchronous SAR focusing and...

引用

2016 IEEE 13th International Conference on Signal processing（ICSP2016）

作者： Xichao Dong Cheng Hu Yuanhao Li Ye Tian School of Information and Electronics Beijing Institute of Technology Beijing Key Laboratory of Embedded Real-time Information Processing Technology

Geosynchronous SAR(GEO SAR) has great potentials in Earth observation as its wide swath coverage and fine resolution. But the long integration time is a double-edged sword which will lead to the error accumulations and the resultant performance degradation. In this paper, 3demonstration experiments are presented for validating GEO SAR focusing feasibility and interferometry under long integration time, and the ionospheric influences. The GNSS satellites, including the Beidou IGSO and GPS satellites, are employed as illuminators. The principles, configurations, data processing and analysis are given for the 3 experiments separately. The experiment results validate well that GEO SAR can focus well and measure surface height with a good accuracy.

关键词： Geosynchronous SAR GNSS satellites Validation experiment

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