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Power minimization with derivative constraints for high dynamic GPS interference suppression

Science China(Information Sciences) 2012年第4期55卷 857-866页

作者： WU RenBiao 1,2,LI Chan 1 & LU Dan 1 1 tianjin key laboratory for advanced signal processing,Civil Aviation University of China,tianjin 300300,China 2 Intelligent Information Institute of ATR lab,Shenzhen University,Shenzhen,518060,China 1. Tianjin Key Laboratory for Advanced Signal Processing Civil Aviation University of China Tianjin 300300 China2. Intelligent Information Institute of ATR Lab Shenzhen University Shenzhen 518060 China

In this paper,a novel adaptive interference suppression algorithm is proposed for high dynamic GPS (global positioning system) *** new method incorporates derivative constraints on the inter-ference DOA (direction of arrival) into power minimization approach,which could broaden the width of nulls in the interferences directions and adapt to the rapid change of the interference *** with the traditional wide nulling algorithm based on the derivative constraints,the new method does not have to know or estimate the DOAs of the desired signal and the *** new method is firstly discussed in the context of spatial processing,and then extended to space-time adaptive processing to mitigate wideband diffusive multipath *** of the new method is verified via simulation examples.

关键词： GPS interference cancellation adaptive arrays space-time adaptive processing high dynamic GPS receiver

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A novel STAP method for the detection of fast air moving targets from high speed platform

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Science China(Information Sciences) 2012年第6期55卷 1259-1269页

作者： WU RenBiao 1,2,JIA QiongQiong 1 & LI Hai 1 1 tianjin key laboratory for advanced signal processing,Civil Aviation University of China,tianjin 300300,China 2 Intelligent Information Institute of ATR lab,Shenzhen University,Shenzhen 518060,China 1. Tianjin Key Laboratory for Advanced Signal Processing Civil Aviation University of China Tianjin 300300 China2. Intelligent Information Institute of ATR Lab Shenzhen University Shenzhen 518060 China

Space-time adaptive processing (STAP) is an effective method for detecting moving target in airborne/spaceborne ***,the detection of fast air moving targets from high speed platform is challenged by the range walk of both the clutter and moving *** is well known that keystone formatting can be used to compensate for the range walk of multiple moving targets simultaneously without using the knowledge of the motion ***,in the presence of serious Doppler ambiguity of fast air moving targets,distribution of the clutter will be affected by the keystone formatting matched to the ambiguity number of targets,and as a result the STAP performance will *** this paper,a novel STAP method is proposed for the detection of fast air moving targets from high speed platform,which can deal with the range walk of both clutter and *** of the new method is verified via simulation examples.

关键词： airborne/spaceborne radar keystone formatting space-time adaptive processing (STAP) moving target detection

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Finger-vein matching based on adaptive vector field estimation

Finger-vein matching based on adaptive vector field estimati...

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2012 19th IEEE International Conference on image processing, ICIP 2012

作者： Yang, Jinfeng Wu, Meijing Wang, Wanyin Shi, Yihua Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China P.O. Box 9 Tianjin China

ISBN: (纸本)9781467325332

In this paper, a new finger-vein vector field estimation method is proposed for the primitive finger-vein feature representation. First, a set of spatial curve filters (SCFs) is built based on a variable curve model in curvature and orientation. To make SCFs adaptive to vein-width variations, a curve length field (CLF) estimation method is then proposed. Next, with the CLF constrain, a vein vector field is established for finger-vein feature description. Finally, finger-vein matching performance is evaluated using Phase-Only-Correlation (POC) measure. Experimental results show that the proposed method is highly powerful in improving finger-vein matching accuracy. © 2012 IEEE.

关键词： Vectors

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Crashed Airplane Detection Based on Feature Fusion in POLSAR image

Crashed Airplane Detection Based on Feature Fusion in POLSAR...

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2012 IEEE 11th International Conference on signal processing(ICSP 2012)

作者： Ping Han Xinshuai Zhang Peng Ge Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China China Airport Construction Group Corporation of CAAC

ISBN: (纸本)9781467321969

A new crashed airplane detection algorithm based on feature fusion is proposed in this paper. Considering the dihedral characteristic of the airplane's tail and the strong scattering intensity of airplane's body, airplane target detection feature is constructed by combining the above two polarimetric properties. Then Constant False Alarm Rate (CFAR) is used for target detection. Experimental results with real polarimetric data from NASA/JPL UAVASR system demonstrate the effectiveness of the proposed method.

关键词： crashed airplane detection dehidral structure feature fusion CFAR algorithm

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PolSAR image Speckle Reduction Based on Pixels Classification

PolSAR Image Speckle Reduction Based on Pixels Classificatio...

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2012 IEEE 11th International Conference on signal processing(ICSP 2012)

作者： Ping Han Xiaohong Yu Fei Dong Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Radar Research Laboratory Department of Electronic Engineering Beijing Institute of Technology

ISBN: (纸本)9781467321969

An effective algorithm for PolSAR image speckle reduction is developed in this paper. First, pixels in the image are classified through three steps:i) HH/α plane is used for image initial classification based on the polarization difference;ii) anisotropy A and total backscattering power after PWF are combined for further classification;iii) hierarchical cluster method is applied to get the final classifications. Then, the pixels are selected to be filtered according to their classes by the linear minimize mean square filter. Experimental results with AIRSAR data show that, the new algorithm is more effective than Scattering-Model-Based speckle filter, not only in speckle suppression, but also in polarimetric properties, structure and texture preservation.

关键词： PolSAR image speckle reduction polarization difference pixel structure polarimetric property

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Aircraft Attitude Estimation Based on Central Difference Kalman Filter

Aircraft Attitude Estimation Based on Central Difference Kal...

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2012 IEEE 11th International Conference on signal processing(ICSP 2012)

作者： Ping Han Haoliang Gan Weikun He Daniel Alazard Franois Defay Yves Brire Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China

When the extended Kalman filter (EKF) is applied in the aircraft attitude estimation, two defects exist:one is computational complexity;the other is large linearization error. Aiming at these problems, central difference Kalman filter (CDKF) based on Stirling interpolation formulation is applied to the low-cost aircraft attitude estimation system which is of less accurate and high noisy sensors. First, the nonlinear mathematical model of aircraft attitude based on quaternion is established, then CDKF is applied to attitude estimation. Experimental results with real flying data show that CDKF is superior to the commonly used EKF method and unscented Kalman filter (UKF). The algorithm not only improves the attitude estimation precision and stability effectively, but also avoids the computing burden of Jacobian matrices. In addition, it is more simple and easy to implement, because it has only one adjustable parameter instead of three in the UKF circumstances.

关键词： Attitude estimation Quaternion CDKF UKF EKF SPKF

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Finger-vein image Restoration Based on Skin Optical Property

Finger-vein Image Restoration Based on Skin Optical Property

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2012 IEEE 11th International Conference on signal processing(ICSP 2012)

作者： Jinfeng Yang Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China

In this paper, a new finger-vein image restoration method is proposed to improve the quality of finger-vein images. In finger-vein imaging, light scattering is the main factor causing finger-vein image degradation, so dealing with scattering issue is helpful for finger-vein restoration. Traditionally, to remove the scattering effect, finger-vein restoration was often implemented using either an estimated point spread function （PSF） or an estimated biological optical model （BOM）. However, both PSF and BOM are incapable of representing the light scattering phenomenon in biological tissues. To reliably process the light scattering in finger-vein imaging, the multilayered PSF and BOM are integrated together in this paper considering the real structure of the human skin tissue. Using the proposed method, the finger-vein images can be progressively restored in a layered manner. The experimental results validate that the proposed method has a good performance in implementing finger-vein restoration.

关键词： image restoration finger-vein PSF scattering removal

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Robust widenull anti-jamming algorithm for high dynamic GPS

Robust widenull anti-jamming algorithm for high dynamic GPS

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International Conference on signal processing Proceedings (ICSP)

作者： Dan Lu Renbiao Wu Wenyi Wang Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China China

In this paper, a robust null broadening algorithm is proposed for high dynamic global positioning system (GPS) interference suppression. The new algorithm reconstructs interference subspace by additional discrete sources of interferences, which could broaden the width of nulls and adapt to the rapid change of the interference directions in the high dynamic environment. Also the proposed algorithm would form the robust beam pattern utilizing the diagonal loading technique, which improves the performance of the conventional null broadening beamformer in snapshot deficient. The simulation results show that the feasibility of the proposed algorithm.

关键词： Global Positioning System Interference Heuristic algorithms Covariance matrices Manganese Receivers Array signal processing

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A novel GPS signal acquisition algorithm

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Advances in Information Sciences and Service Sciences 2012年第17期4卷 597-604页

作者： Li, Jie Wu, Renbiao Wang, Wenyi Lu, Dan College of Electronic and Information Engineering Tianjin University Tianjin China Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin China

signal acquisition of Global Positioning System (GPS) is a search process which is used for the detection of satellite signals and providing initial conditions for the tracking program. The conventional two-dimension-search acquisition method finds the frequency and C/A code phase of the satellite simultaneously, and takes advantage of the correlation character of C/A code to complete acquisition. In addition, further accurate frequency estimation is needed because the frequency resolution of the conventional acquisition algorithm is too low to satisfy the requirement of the tracking loop. A new GPS acquisition algorithm, which not only changes the GPS acquisition process to the parameter estimation problem but also estimates signal frequency with Doppler and code phase in turn, is presented in this paper. It can be shown from the simulation results that without affecting the acquisition results, the computation complexity of new algorithm has been obviously decreased compared with the conventional algorithm.

关键词： Global positioning system

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Research on Satellite Navigation Performance Prediction Method in Support of PBN

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Physics Procedia 2012年 33卷 535-541页

作者： Han Yi Shen Xiaoyun Yan Siming Tianjin Substation North China Air Traffic Management Bureau CAACTianjin China Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of ChinaTianjin China

Performance Based Navigation (PBN) will lead a significant change of aviation navigation, and the prediction of satellite navigation performance becomes one of the key elements. Based on the analysis of main guidelines about satellite navigation performance and the relationship among them, simple models of GNSS performance were built, basic method and process of performance method were represented.

关键词： PBN Satellite Navigation Navigation Performance Prediction

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