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第七届中国卫星导航学术年会

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

ISBN: (纸本)9789811009334

Because of Global Positioning System(GPS)is easily interferenced by other signal,this paper design an anti-jamming GPS receiver based on the vector tracking loop(or vector lock loop-VLL),which improve its anti-jamming performance on the tracking *** traditional scalar tracking loop(or scalar lock loop-SLL)track the satellite *** is no information exchange between each channel,which ignores the relationship between the receiver’s navigation information(position and velocity)and the tracking loop information(code phase and Doppler frequency).The vector tracking loop take the advantage of this relationship,and combine the navigation filter with tracking loop in a Kalman filter,which improve the receiver’s anti-jamming ability and *** simulation analyses the influence on the tracking loop whether there has an interference,and this paper gives the comparison of position and velocity ***,the weighted least squares method is used to compare the variance of predicted pseudo-range error of the two tracking loop when the power of the interference *** paper concluded that the vector tracking loop has better antijamming ability.

关键词： vector tracking loop weighted least squares anti-jamming

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Anti-jamming Algorithm Analysis Based on UCA for Attitude High-dynamic GNSS

Anti-jamming Algorithm Analysis Based on UCA for Attitude Hi...

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第七届中国卫星导航学术年会

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

ISBN: (纸本)9789811009334

In Global navigation satellite systems(GNSS),when the receiver carrier is in the situation of attitude high dynamic,the directions of arrival(DOA)of signal and interference will change rapidly over *** this point,conventional adaptive anti-jamming algorithms become *** this paper,According to the structure shape of practical attitude high dynamic carrier,the DOAs changes of signal and interference in the case of uniform circular array are analyzed,and the Capon-Laplace algorithm based on uniform circular array(UCA)was provided to suppress the *** effectiveness of the algorithm is verified by simulation *** the analysis of attitude high-dynamic parameter,the paper compared the feasibility of the algorithm in different degrees’attitude highdynamic circumstances,giving a further verification on the effectiveness of the algorithm.

关键词： GNSS attitude high dynamic Capon-Laplace jamming suppression

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Low complexity spectral moments estimator under low SNR condition

Low complexity spectral moments estimator under low SNR cond...

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Integrated Communications, Navigation and Surveillance Conference, ICNS

作者： Xiaoguang Lu Zhe Zhang Ping Han Tianjin Key Lab of Advanced Signal Processing Civil Aviation University of China Tianjin China

ISBN: (纸本)9781509021505

Airborne weather radars are used by pilots to identify areas containing significant precipitation, turbulence, and wind shear on the flight path. The different atmospheric hazards can be determined by airborne weather radar using the spectral moments of radar echoes. The pulse pair processing method and the FFT based method are the most widely used spectral moments estimators. However, the performance of these method is poor under low SNR conditions as it is a nonparametric method. A parametric spectral moments estimation method is proposed based on subspace analysis of the covariance matrix of the echoes with Gaussian-shaped spectrum. A fast algorithm for this method is also implemented for demonstration, in which the 2D-search problem is decomposed into two 1D-search routines. The numerical analysis verifies that the presented method functions effectively in low SNR scenario.

关键词： Eigenvalues and eigenfunctions Wind Covariance matrices signal to noise ratio Airborne radar

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A two-stage approach for managing actuators redundancy and its application to fault tolerant flight control

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Chinese Journal of Aeronautics 2015年第2期28卷 469-477页

作者： Zhong Lunlong Félix Mora-Camino Tianjin Key Laboratory for Advanced Signal and Image Processing Civil Aviation University of China Automation Research Group of MAIAA ENAC Toulouse University

In safety-critical systems such as transportation aircraft, redundancy of actuators is introduced to improve fault tolerance. How to make the best use of remaining actuators to allow the system to continue achieving a desired operation in the presence of some actuators failures is the main subject of this paper. Considering that many dynamical systems, including flight dynamics of a transportation aircraft, can be expressed as an input affine nonlinear system, a new state repre- sentation is adopted here where the output dynamics are related with virtual inputs associated with the intended operation. This representation, as well as the distribution matrix associated with the effectiveness of the remaining operational actuators, allows us to define different levels of fault tol- erant governability with respect to actuators＇ failures. Then, a two-stage control approach is devel- oped, leading frst to the inversion of the output dynamics to get nominal values for the virtual inputs and then to the solution of a linear quadratic （LQ） problem to compute the solicitation of each operational actuator. The proposed approach is applied to the control of a transportation air- craft which performs a stabilized roll maneuver while a partial failure appears. Two fault scenarios are considered and the resulting performance of the proposed approach is displayed and discussed.

关键词： Actuator allocation Fault tolerant control Flight control Linear quadratic （LQ）problem Nonlinear control

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Symbol error performance analysis of OFDM receiver with pulse blanking over frequency selective fading channel

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Journal of Communications 2016年第3期11卷 325-332页

作者： Liu, Hai-Tao Yin, Zhi-Sheng Zhang, Xue-Jun Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin30030 China College of Electronic and Information Engineering BeiHang University Beijing100191 China

Pulse blanking is a widely used method to eliminate impulsive interference in orthogonal frequency division multiplexing (OFDM) receiver. To analyze the effect of Inter Carrier Interference (ICI) caused by pulse blanking on the performance of symbol error rate (SER) for OFDM receiver, the analytical expression of signal to noise ratio (SNR) for OFDM receiver with pulse blanking is derived. The SER of OFDM receiver with pulse blanking over AWGN, Rayleigh and Ricean fading channel are also analyzed quantitatively based on the SNR expression. Simulation results validate the accuracy of our derived formulas. © 2016 Journal of Communications.

关键词： signal to noise ratio

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Analysis of the wind turbine RCS and micro-Doppler feature based on FEKO 15

Analysis of the wind turbine RCS and micro-Doppler feature b...

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2015 15th Annual Integrated Communication, Navigation and Surveillance Conference, ICNS 2015

作者： He, Weikun Ma, Yuzhao Shi, Yuluo Wang, Xiaoliang Zhang, Siyuan Wu, Renbiao Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin China

ISBN: (纸本)9781479989522

As a kind of renewable and clean energy, wind energy has been widespread concerned by countries around the world. However, it is shown that wind turbines will have a serious impact on Air Traffic Control (ATC) communication, navigation and surveillance systems due to the complex electromagnetic scattering properties. Therefore, analysis of the wind turbine Radar Cross Section (RCS) and micro-Doppler feature are of great significance. FEKO is a suit of professional electromagnetic analysis tool which has a large advantage of calculating the RCS of wind turbines and other electrically large objects. The RCS of wind turbines is calculated by FEKO, and the variability of wind turbine RCS with azimuth and elevation angles is analyzed in the paper. Meanwhile, in order to further present the micro-Doppler features of wind turbine echo, wind turbine echo is simulated based on FEKO and the characteristics of wind turbine echo in time domain, frequency domain and time-frequency domain are also analyzed, by which we reveal the micro-Doppler features of wind turbine caused by the rotation of wind turbine blades. The great agreement between simulation and real data confirms the validity of the FEKO simulation results in the paper. © 2015 IEEE.

关键词： Time domain analysis

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Wind turbine clutter mitigation based on matching pursuits

Wind turbine clutter mitigation based on matching pursuits

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IET International Radar Conference 2015

作者： He, Weikun Shi, Yuluo Wang, Xiaoliang Wu, Renbiao Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin China

ISBN: (纸本)9781849199940

Wind turbines could have a serious impact on Air Traffic Control (ATC) radar system because of the complex electromagnetic scattering properties. In this paper, matching pursuit technology is studied to mitigate the wind turbines interference. Due to the large amount of calculation in the conventional MP algorithm, rotation rate of wind turbine and radar azimuth are firstly estimated based on the priori information, then matching pursuit algorithm is applied to mitigate the wind turbine clutter. Effectiveness of the proposed method is verified via simulation experiments.

关键词： Wind turbines

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Jamming suppression for ADS-B based on a cross-antenna array 15

Jamming suppression for ADS-B based on a cross-antenna array

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2015 15th Annual Integrated Communication, Navigation and Surveillance Conference, ICNS 2015

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

ISBN: (纸本)9781479989522

The weakness of ADS-B signals makes it vulnerable to jamming. In order to suppress jamming, the paper proposes an ADS-B anti-jamming approach with low-complexity based on a cross-antenna array. First, down-sampling the digital IF signals received by array, and estimating the covariance matrix using the down-sampled snapshots. Because of the different duration and different features of DOAs between ADS-B 1090ES signals and jamming, the larger eigenvalues of the estimated covariance matrix mainly consist of jamming. Then the array weight vector could be conducted by power inversion algorithm based on the covariance matrix obtained from the first step. Finally, jamming can be nulled by the array weight vector. Thus the proposed method would almost only suppress jamming and the output SINR would be improved sharply. Down-sampling reduces the complexity of the algorithm. Simulation and experiments results show the effectiveness of the proposed approach.

关键词： Covariance matrix

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Analysis of the wind turbine RCS and micro-Doppler feature based on FEKO 15

Analysis of the wind turbine RCS and micro-Doppler feature b...

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2015 15th Annual Integrated Communication, Navigation and Surveillance Conference, ICNS 2015

作者： Zhang, Siyuan Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China China

ISBN: (纸本)9781479989522

?As a kind of renewable and clean energy, wind energy has been widespread concerned by countries around the world. Recently, the global wind power installed capacity is growing exponentially. ?Wind turbines will have a serious impact on Air Traffic Control (ATC) communication, navigation and surveillance systems due to the complex electromagnetic scattering properties.

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Runways detection based on scattering similarity and structural characteristics 15

Runways detection based on scattering similarity and structu...

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2015 15th Annual Integrated Communication, Navigation and Surveillance Conference, ICNS 2015

作者： Han, Ping Chang, Ling Shi, Qingyan Qu, Jingyi Civil Aviation University of China Tianjin Key Lab for Advanced Signal Processing China

ISBN: (纸本)9781479989522

In this paper, a new algorithm of runways detection based on classification is proposed for PolSAR image, in which scattering similarity and structural characteristics of airport runways are used as target feature for classification. Firstly, training sample templates are built by initial terrain classification with scattering similarity. Then, Bayesian classification is used to classify the whole image. Finally, morphology filtering and the runways structural features such as parallels, topologic property are used to detect real runways. Multi-look fully polarimetric SAR data acquired by U.S. UAVSAR systems is used to verify the proposed algorithm. Experimental results show that the novel method can detect runways effectively and has a low false alarm rate. Besides, the detected runways keep an intact structure and clear outlines.

关键词： Feature extraction

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