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Research on lidar visibility measurement system for airport

Research on lidar visibility measurement system for airport

引用

2011 International Conference on Electric Information and Control Engineering, ICEICE 2011

作者： Xiong, Xinglong Feng, Shuai Jiang, Lihui Zhuang, Zibo Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin China Engineering Technical Training Center Civil Aviation University of China Tianjin China International Flight Institute Civil Aviation University of China Tianjin China

ISBN: (纸本)9781424480395

Aiming at the difficulty in measuring the slant visibility in civil aviation airport, a solution of lidar visibility measurement system is proposed. Semiconductor laser with low pulse energy and high pulse repeat frequency while photodiode detector with the characteristics of low noise and high quanta efficiency have been adopted, which ensure the stability of system works. By using two scanning modes, the flexibility and the measurement accuracy of the system are improved. Experimental results show that the measurement accuracy of the system is better than 20%, which satisfy the requirements of International Civil Aviation Organization. © 2011 IEEE.

关键词： Optical radar

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Wind shear signal simulation of the airborne weather radar

Wind shear signal simulation of the airborne weather radar

引用

IEEE National Conference on Radar

作者： Yi Fan Renbiao Wu Zhichao Meng Zhigang Su Xiaoguang Lu Jingxiong Huang Tianjin Key Laboratory for Advanced Signal Processing Civil Aviation University of China Tianjin P.R. China Intelligent Information Institute of ATR Lab Shenzhen University Shenzhen P.R. China

Wind shear is recognized by a major hazard during takeoff and landing of aircraft, which can be detected by airborne forward-looking weather radar. A high-fidelity wind shear model constructed by the Computational Fluid Dynamics software has been implemented in this study. The model is reasonably representative of the downward wind falling to the ground during the mature phase of the microburst wind shear. The results of the radar echo signal simulation based on the above wind shear model show that the distribution of the velocities has an obvious horizontal "S" shape. The simulated results demonstrate the typical characteristic of the microburst wind shear.

关键词： Wind Atmospheric modeling Numerical models Computational modeling Meteorological radar

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Tracking object using object-strips color feature

Tracking object using object-strips color feature

引用

WASE International Conference on Information Engineering

作者： Zhang, Liang Wu, Rong Tianjin Key Lab. for Advanced Signal Processing Civil Aviation University of China Tianjin 300300 China

ISBN: (纸本)9780769540801

The paper presents a new tracking scheme based on the object-strips color (OSC) feature. Firstly, the images captured by the camera are transformed into a format which is suitable for object tracking. Secondly, background subtraction method is used to detect the moving object. Then the OSC feature is represented by dividing the detected object into several strips and integrating the mean hue of each strip into a one-dimensional vector. Finally, the detected object is tracked by matching the OSC features using correlation coefficient criteria. Since the OSC feature includes both color and spatial distribution information of the detected object, the proposed method is more reliable than traditional color-based tracking algorithms. Furthermore, the OSC feature, which is a one-dimensional vector, is so simple that can satisfy the real-time requirement in video surveillance easily. The experimental results show that the proposed method has a good performance for tracking objects. © 2010 IEEE.

关键词： Object detection

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Fake shadow detection based on SIFT features matching

Fake shadow detection based on SIFT features matching

引用

2010 WASE International Conference on Information Engineering, ICIE 2010

作者： Zhang, Liang He, Xiaomei Tianjin Key Lab. for Advanced Signal Processing Civil Aviation University of China Tianjin 300300 China

ISBN: (纸本)9780769540801

Shadow detection is crucial for robust and reliable visual surveillance system. The shadow detection method based on gray level and color information will fail when object parts have very similar properties with real shadow. In this paper, we present a novel shadow detection scheme which can conveniently verify detected shadows utilizing the extracted SIFT (Scale Invariant Feature Transform) features. After candidate shadow regions are detected by utilizing rgb color model, SIFT algorithm is exploited for local feature detection in two consecutive frames. Then location information of SIFT features in moving object and shadow is analyzed. Finally fake shadow regions are successfully identified. Experiments indicate that the proposed algorithm is fast and exact, and improves the accuracy of the moving object detection. The proposed method can be used for shadow detection in SIFT features tracking and will be highly effective. © 2010 IEEE.

关键词： Object detection

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Efficient finger vein localization and recognition

Efficient finger vein localization and recognition

引用

2010 20th International Conference on Pattern Recognition, ICPR 2010

作者： Yang, Jinfeng Li, Xu Tianjin Key Lab. for Advanced Signal Processing Civil Aviation University of China P.O. Box 9 Tianjin China

ISBN: (纸本)9780769541099

In order to achieve accurate recognition of human finger vein (FV), this paper addresses the problems of finger vein localization and vein feature extraction. An inherent physical property of human fingers is used to localize the region of interest (ROI) of vein images as well as removing uninformative vein imagery based on the inter-phalangeal joint prior. In addition, vein images are characterized as a series of energy features through steerable filters. Experimental results show the promising performance of the proposed algorithm for human vein identification. © 2010 IEEE.

关键词： Palmprint recognition

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Object tracking based on local feature points

Object tracking based on local feature points

引用

International Congress on image and signal processing

作者： Wang, Haili Zhang, Liang Training Center of Engineering Technology Civil Aviation University of China Tianjin China Tianjin Key Lab. for Advanced Signal Processing Civil Aviation University of China Tianjin China

ISBN: (纸本)9781424465149

This paper presents a novel local-feature-based algorithm to track objects through frames. Real-time performance and occlusion are great challenges in object tracking. Local features are more distinctive than global features in dealing with occlusion. SURF (Speeded-Up Robust Feature) can robustly identify objects in clutter scene and occlusion. However, initial SURF algorithm has difficulty in matching accurately. Combined NN/SN (ratio of closest and next closes distances) with RANSAC (Random Sample Consensus) algorithm and location correlation of corresponding features between two frames is proposed to reduce false match and speed up the matching procedure. This method exhibits very good performance in high reliable applications, for its effectiveness and reduced complexity. Simulation on PETS database proves it effective. ©2010 IEEE.

关键词： Tracking (position)

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STAP compensation technique based on homomorphic filtering in GPS

STAP compensation technique based on homomorphic filtering i...

引用

4th IEEE International Symposium on Phased Array Systems and Technology, Array 2010

作者： Wu, Renbiao Xu, Rulan Rulan, Dan Yu, Jianpin ATR Lab Intelligent Information Institute Shenzhen University Shenzhen 518060 China Tianjin Key Laboratory for Advanced Signal Processing Civil Aviation University of China Tianjin 300300 China

ISBN: (纸本)9781424451272

Space time adaptive processing (STAP) can be used to remove hostile jammers interfering for Global Positioning System (GPS) receivers, especially in the presence of jammer multipath. However, the STAP filter can bring in distortion to the GPS signal because it does not have a uniform frequency response across the operating band, which would dramatically reduce the accuracy of the users' position. Based on the homomorphic filtering a new method is proposed to compensate the distortion caused by the STAP filter. Finally, simulation results show the proposed method is effective. © 2010 IEEE.

关键词： Jamming

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Parameter estimation of moving target based on linearly constrained space-time adaptive monopulse technique

Parameter estimation of moving target based on linearly cons...

引用

4th IEEE International Symposium on Phased Array Systems and Technology, Array 2010

作者： Wu, Renbiao Wang, Lu Su, Zhigang Huang, Jingxiong Tianjin Key Laboratory for Advanced Signal Processing Civil Aviation University of China Tianjin 300300 China ATR Lab Intelligent Information Institute ShenZhen University Shenzhen 518060 China

ISBN: (纸本)9781424451272

Technique of space-time adaptive processing (STAP), which is usually employed by airborne radar to reject the ground clutter and jamming and at the same time, detect the ground moving targets, can not estimate the spatial-temporal parameters of the corresponding targets. Monopulse technique, as a mature method for parameter estimation can be used on airborne radar, however, the estimation performance of this method is dramatically effected by the ground clutter and jamming components present, even when these components falls into the mainbeam interval. By combining the STAP technique with the monopulse technique, a new method for estimating the spatial-temporal parameters of moving targets is proposed and referred as to LC-STAM in this paper. Additionally, the proposed method utilizes the beam null, monopulse slope, and decoupling constraints to remove the worse influence on the beam shape from the mainbeam clutter, maintain the characteristic of the monopulse ratio, and increase the veracity of parameter estimation. Simulation results illustrated that the LC-STAM method possesses the excellent estimation performance of the spatail-temporal parameters by comparing with the other similar methods. © 2010 IEEE.

关键词： Space time adaptive processing

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A robust estimation method to coregistration error for InSAR interferometric phase

A robust estimation method to coregistration error for InSAR...

引用

IEEE National Conference on Radar

作者： Hai Li Renbiao Wu Ping Han Guisheng Liao Tianjin Key Lab of Advanced Signal Processing Civil Aviation University of China Tianjin China National Laboratory of Radar Signal Processing Xidian University Xi'an China

ISBN: (纸本)9781424458110;9781424458127

In this paper, we propose a robust estimation method to coregistration error for synthetic aperture radar interferometry (InSAR) interferometric phase. In the method, the optimal joint data vector is determined, the true steering vector is computed according to the data vector, and then the beamforming technique with the steering vector is used to estimate the InSAR interferometric phase. The method can carry out image coregistration and interferometric phase estimation simultaneously. Theoretical analysis and computer simulation results show that the method can provide accurate estimate of the terrain interferometric phase (interferogram) even when the coregistration error reaches one pixel.

关键词： Robustness Phase estimation Synthetic aperture radar interferometry Covariance matrix Phase noise Adaptive filters Pixel Radar signal processing Computer errors Filtering

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Modified Range-Doppler Imaging Method for the High Squint SAR

Modified Range-Doppler Imaging Method for the High Squint SA...

引用

IEEE Radar Conference

作者： Shuyan Wang Zhigang Su Renbiao Wu Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin Key Lab for Advanced Signal Processing Civil Aviation Universityof China

ISBN: (纸本)9781424458110

In this paper, a modified Range-Doppler (RD) algorithm with the keystone Transform and the rank-deficient Capon is proposed for the shorter Synthetic Aperture Radar (SAR) imaging in the high squint mode. With the decrease of the aperture time under the squint mode, the linear range-walk becomes the dominant part of the range migration. The keystone Transform is well suitable for removal of the range walk. In order to achieve higher resolution in the azimuth domain with the shorter SAR, the rank-deficient Capon which is an efficient non-diagonal loading spectral estimation based on rank-deficient sample covariance matrix is adopted. Simulation results can obtain the finer SAR images of the proposed approaches.

关键词： Synthetic aperture radar Radar scattering Azimuth signal processing algorithms Radar polarimetry Covariance matrix Brain modeling Geometry Radar imaging signal resolution

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