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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521-530 订阅

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An optimized water detection algorithm for SAR images utilizing SOPC technologies

An optimized water detection algorithm for SAR images utiliz...

引用

IET International Radar Conference 2015

作者： Liu, Yan Li, Lin Xie, Yizhuang Chen, Liang Deng, Yi Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing Institute of Technology Beijing100081 China ECE Department of Virginia Polytechnic Institute State University Falls ChurchVA22124 United States Beijing Institute of Remote Sensing China

ISBN: (纸本)9781849199940

This paper investigates a water detection algorithm of region-of-interest extraction based on the combination of sobel edge detection and contrast stretching transformation. The implementation of the proposed method is utilized for SAR (Synthetic Aperture Radar) imaging with SOPC (Systems on a Programmable Chip) embedded technology. It also puts forward an effective and realizable approach for the parallel processing data. The water detection algorithm is first optimized for SOPC system and is implemented on Xilinx Zynq-7020 chip with dual cortex-A9 ARM processors. As a result, the average consumption time of water detection algorithm reduces over 38 percent, which ensures the real-time requirement in the real-time object detection system.

关键词： Synthetic aperture radar

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Pulse repetition frequency design for geosynchronous SAR in ellipcial orbit

Pulse repetition frequency design for geosynchronous SAR in ...

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IET International Radar Conference 2015

作者： Yin, Wei Yang, Wenfu Ding, Zegang Liu, Wei Zhang, Qingjun Ren, Jingjing Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Radar Research Lab. Beijing Institute of Technology Beijing100081 China China Academy of Launch Vehicle Technology Beijing100076 China Beijing Institute of Spacecraft System Engineering CAST Beijing100094 China

ISBN: (纸本)9781849199940

Elliptical orbit and squint mode are widely used in the system design of geosynchronous synthetics aperture radar (GEO SAR) to improve the coverage performance. In this paper, the effects of orbit height variation and squint mode to pulse repetition frequency (PRF) design are analyzed. The orbit height variation causes the variation of nadir interference and beam illumination region, and squint mode produces large range cell migration (RCM). These can induce invalidations of the designed PRF. Based on this, the constraints of nadir interference and transmit interference are updated for GEO SAR, and the effective time for the designed PRF is derived. PRF number required for imaging in one orbital period is analyzed.

关键词： Synthetic aperture radar

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Impact of the time-spatial background ionosphere variation on geosynchronous SAR interferometric phase screen

Impact of the time-spatial background ionosphere variation o...

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IET International Radar Conference 2015

作者： Yuanhao Li Cheng Hu Shaoyang Kong Xichao Dong Dongyang Ao Teng Long Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing 100081

ISBN: (纸本)9781510822023

Because of working in L band, geosynchronous synthetic aperture radar interferometry (GEO InSAR) and differential interferometry (GEO D-InSAR) system is sensitive to the interferometric phase screen errors introduced by ionosphere. However, conventional ionosphere time-spatial freezing model used in Low Earth Orbit (LEO) SAR is no longer valid due to the long integration time and large imaging width of GEO SAR. In this paper, especially aimed at the time-spatial background ionosphere variation, we firstly theoretically analyzed its impacts on GEO InSAR phase screen. Then, some simulations were conducted by virtue of the real Total Electron Content (TEC) data to study the impacts. The results suggest the serious errors will be brought in the GEO InSAR phase screen by the time-spatial background ionosphere variation.

关键词： Background ionosphere Geosynchronous SAR (GEO SAR) InSAR Interferometric phase screen

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Ground-based SAR imaging algorithm based on keystone formatting

Ground-based SAR imaging algorithm based on keystone formatt...

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IET International Radar Conference 2015

作者： Cong Mao Qian He Weiming Tian Cheng Hu Tao Zeng Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China

ISBN: (纸本)9781510822023

In this paper, a novel imaging algorithm tailored for GBSAR data is proposed. The characteristics of GB-SAR data are firstly analyzed, and then a signal model (after range compression) is analytically built up. According to this model, our imaging algorithm, based on keystone formatting and range-Doppler domain subblock division, is then put forward, its azimuth focusing is essentially achieved through a space-variant dechirp operation. This algorithm can be widely applied to near-field and far-field as well as wide view angle GB-SAR data sets. Moreover, the computational cost of this algorithm is quite low. The image is formatted in a polar-like coordinate which is well fit for GB-SAR data. The algorithm is extensively validated both with numerical simulations and real GB-SAR data.

关键词： Ground-based synthetic aperture radar SAR imaging algorithm

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A selection method of frequency combination in MF-InSAR system

A selection method of frequency combination in MF-InSAR syst...

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IET International Radar Conference 2015

作者： Qi, Yalin Zhang, Qi Yang, Wenfu Yang, Shuangjing Liu, Tiandong Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Radar Research Lab. School of Information and Electronics Beijing Institute of Technology Beijing100081 China China Academy of Launch Vehicle Technology Beijing100076 China Beijing Institute of Spacecraft System Engineering CAST Beijing100094 China

ISBN: (纸本)9781849199940

As an extension of the Interferometric Synthetic aperture radar (InSAR), the multi-frequency InSAR can realize high-accuracy elevation extraction of the steep terrain. Though the maximum likelihood estimation (MLE) is widely used in the signal processing of multi-frequency InSAR, the performance of this method can be influenced by the selection of frequency combination. At the beginning, this paper analyses the elevation estimated effectiveness of different frequency combinations from the aspect of Cramer-Rao Lower Bound (CRLB). Then, it calculates the ambiguity cycle as a further filter for the optimal frequency combination. Finally, this paper discusses the adaptability to the phase noise with the help of Monte Carlo simulation strategy. In consideration of these three aspects, a selection method of frequency combination is proposed, and further simulation results are provided in quantity. Relevant researches can be used in the design of multi-frequency InSAR system.

关键词： Phase noise

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Multi-static MIMO-SAR three dimensional deformation measurement system

Multi-static MIMO-SAR three dimensional deformation measurem...

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Asian and Pacific Conference on Synthetic Aperture Radar (APSAR)

作者： Tao Zeng Cong Mao Cheng Hu Xiaopeng Yang Weiming Tian School of Information and Electronics Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing China

ISBN: (纸本)9781467372985

Herein is proposed a novel high-steep rock slope landslide monitoring system based on the configuration of multi-static multiple-input multiple-output synthetic aperture radar (MIMO-SAR). In this system, three spastically distributed radars are employed. Each is a Ku-band MIMO-SAR, transmitting mutually orthogonal waveforms and sensing the slope movement from different view angles. The three radars can then achieve the deform measurements in the three line of sight (LOS) directions. After an effective fusion of these measurements, the deform vector, with direction and amount, can be resolved. This vector is particularly important for risk warning as well as for understanding the motion mechanism of landslide. Moreover, the data acquisition period can be largely reduced, since the use of MIMO radar allows a simultaneous sampling of the scene echo. The time decorrelation is therefore very small, and hence high measurement accuracy can be expected. It can be proved that, using this system, the three-dimensional accuracy can reach 0.1 ~ 1 mm. Simulations and experimental datasets are used to validate this proposal.

关键词： Accuracy Arrays Synthetic aperture radar Monitoring Geologic measurements Terrain factors Imaging

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Moving object detection and tracking based on ZYNQ FPGA and ARM SOC

Moving object detection and tracking based on ZYNQ FPGA and ...

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IET International Radar Conference 2015

作者： Wenchao Liu He Chen Long Ma Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing 100081 China

In this paper, an FPGA-based moving object detection and tracking system is introduced for image processing application. The algorithms presented include object detection based on dynamic background difference, kalman filter for object tracking. The target device for the implementation is a Xilinx Zynq-7000 FPGA. The use of ARM dual core processor, NEON vector coprocessor unit and coprocessing IP peripherals generated by vivado HLS aim to improve the data processing ability of the system. In the dynamic background, the system realized accurate detection and tracking of moving objects in real-time.

关键词： FPGA Kalman filter Object detection and tracking dynamic background difference image processing Object detection Field programmable gate arrays moving target detection Kalman filters Image processing target device tracking TRACKING SYSTEM

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Methods to improve system verification efficiency in FPGA-based spaceborne SAR image processing system

Methods to improve system verification efficiency in FPGA-ba...

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IET International Radar Conference 2015

作者： Zhu Yang Teng Long Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing 100081 China

ISBN: (纸本)9781510822023

With the rapid development of satellite-based signal processing technologies comes the widespread deployment of SAR image processing systems in spaceborne applications, many of which are implemented as FPGAbased systems thanks to the introduction of modern programmable devices with high capacity and complexity. However, as raw data of SAR satellites grow in size and bandwidth the effective implementation and especially the efficient system verification are emerging as the bottleneck in the development of FPGA-based SAR image processing systems. This paper proposes methods in the verification phase of FPGA-based SAR processing system development which on one hand increases the verification speed during simulations and on the other addresses the hardware/Matlab mismatch issue through comparison of floating point numbers on grounds of error analysis from a mathematical approach. Actual development process indicate that the proposed methods guarantee quick design convergence, and test results on real hardware confirm that the SAR image processing system offers acceptable quality of image output.

关键词： SAR imaging systems System-level verification Spaceborne SAR Image processing system FPGA implementation Image processing systems Synthetic aperture radar Specific absorption rate Rescue SAFETY ANALYSIS REPORTS Radar polarimetry System testing Verification Image processing FLOATING POINTS Systems development

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Design and implementation of ASIC verification platform for the SAR algorithm

Design and implementation of ASIC verification platform for ...

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IET International Radar Conference 2015

作者： Zhubin Wang Chen Yang He Chen Yu Xie Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing 100081 China

This paper presents a method of the implementation of a verification platform. The platform is applied to an ASIC chip designed for the key algorithm of SAR signal processing. The design is a complicated process and the chip function is computationally burdensome, thus the verification is difficult. Balancing the competing demands for efficiency, quality, time and cost, the verification platform is carefully designed using the Verilog language, with Synopsys VCS-MX2009 adopted. The experimental results show that the design errors of timing and anti-protocols have been exactly checked out and the verification coverage reaches 100% at last. The platform possesses satisfying characteristics such as high performance, fine configurability, flexibility and expansibility.

关键词： ASIC Chirp Scaling Algorithm Synthetic Aperture Radar Verification platform ASIC application specific integrated circuits Synthetic aperture radar design error Verification Platform EXPANSIVITY Rescue Specific absorption rate SAFETY ANALYSIS REPORTS

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Implementation on FPGA for CORDIC-based computation of arcsine and arccosine

Implementation on FPGA for CORDIC-based computation of arcsi...

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IET International Radar Conference 2015

作者： Xiaoning Liu Yizhuang Xie He Chen Bingyi Li Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing 100081 China

ISBN: (纸本)9781510822023

This paper concentrates on the hardware implementation of CORDIC algorithm for computing inverse trigonometric functions like arcsine and arccosine. We improve the existing algorithm by changing the initial rotating vector of the iterations and modifying the judging condition of rotation direction. Due to the improvement, two iterations are saved and the drawback of the previous algorithm is corrected. In contrasting with the previous implementation, the improved algorithm consumes less hardware resources and its computing results are more accuracy.

关键词： CORDIC Double Iteration Algorithm Arcsine Arccosine Digital arithmetic Field programmable gate arrays direction of rotation iterative methods algorithms rotation vector

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