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Two-dimensional PCA for SAR automatic target recognition

Two-dimensional PCA for SAR automatic target recognition

引用

2007 1st Asian and Pacific Conference on Synthetic Aperture Radar, APSAR 2007

作者： Xiaoguang, Lu Ping, Han Renbiao, Wu Tianjin Key Lab. for Advanced Signal Processing North Campus Civil Aviation University of China P.O.Box 9 Tianjin 300300 China

ISBN: (纸本)1424411882

In this paper, a new technique for Synthetic Aperture Radar (SAR) automatic target recognition (ATR) is developed, which is builded upon Two-Dimensional Principle Component Analysis (2DPCA). First, 2DPCA is applied to extract features in frequency domain, which is based on image matrix directly. Then support vector machine (SVM) is used for classification. Experimental results on MSTAR dataset show that the 2DPCA method both gives higher recognition rate, and are computationally more efficient than PCA. © 2007 IEEE.

关键词： Support vector machines

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Analysis of PC number selection in SAR ATR

Analysis of PC number selection in SAR ATR

引用

2007 1st Asian and Pacific Conference on Synthetic Aperture Radar, APSAR 2007

作者： Ying, Wang Ping, Han Renbiao, Wu Tianjin Key Lab for Advanced Signal Processing North Campus Civil Aviation University of China P. O. Box 9 Tianjin 300300 China

ISBN: (纸本)1424411882

The effect of PC (Principal Component) number upon SAR ATR (Synthetic Aperture Radar Automatic Target Recognition) performance based on PCA (Principal Component Analysis) is analyzed. First, PCA features are extracted with different PC number, and then SVM is used to classify. Experimental results based on MSTAR data sets show that the performance is optimized when the accumulative contribution rate of the selected PC is 70%. Compared with the common selected method of PC number, the new selection method improves recognition performance and also reduces computational complexity. © 2007 IEEE.

关键词： Principal component analysis

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Speech Recognition Model of Civil Aviation Radiotelephony Communication Based on Improved Conformer

Speech Recognition Model of Civil Aviation Radiotelephony Co...

引用

2022 International Conference on Automation, Robotics and Computer Engineering, ICARCE 2022

作者： Xiao, Zewei Jia, Guimin Shi, Bo Civil Aviation University of China Tianjin Key Lab for Advanced Signal Processing China Civil Aviation University of China College of Electronic Information and Automation Tianjin China

ISBN: (纸本)9781665475488

Radiotelephony communication has a special grammatical structure and pronunciation, and it is difficult to apply the model of generic speech recognition directly to the field of radiotelephony communication. We propose a Conv1DSlide-Conformer model for speech recognition of radiotelephony communication. The sliding-window attention mechanism is used instead of the self-attention mechanism to improve the decoding speed of the model and increase the adaptability of the model to radiotelephony communication. The convolutional module is used instead of the feedforward neural network module to make the encoder focus more on local information. The improved Conformer model processes the FBANK features of radiotelephony communication and can extract high-dimensional features that better fit the characteristics of radiotelephony communication. The use of concatenated temporal classification (CTC) combined with a data augmentation strategy assists training to speed up convergence during model training and reduce the complexity of model training. Decoding is assisted by CTC and language models to improve the performance of speech recognition. The experimental results show that the improved Conformer speech recognition model in this paper reduces the word error rate to 8.1% and 7.8% on the actual Chinese radiotelephony communication speech dataset. © 2022 IEEE.

关键词： Radio telephone

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Direction of arrival estimation for GPS signal via toeplitz approximating the cross-correlation matrix

Direction of arrival estimation for GPS signal via toeplitz ...

引用

2007 International Symposium on Intelligent signal processing and Communications Systems, ISPACS 2007

作者： Su, Zhigang Lu, Dan Peng, Tingning Li, Ping Wu, Renbiao Department of Electronic Engineering Tsinghua University Beijing 100084 China Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin 300300 China

ISBN: (纸本)9781424414475

In Global positioning system (GPS), adaptive beamforming is an effective method for enhancing the desired signal and suppressing interferences simultaneously. The direction-of-arrival (DOA) of the desired signal, however, as a priori information, is required. Due to very lower signal-to-noise ratio for GPS signal, the DOA estimation is a challenge problem. In this paper, a preprocess is presented which Toeplitz approximates the cross-correlation (CC) matrix. The matrix Toeplitz approximation recovers the Toeplitz structure, and the approximated matrix is used to obtain more accuracy estimates via MUSIC method. © 2007 IEEE.

关键词： Direction of arrival

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Use of large curvilinear synthetic aperture for 3-D target imaging

Use of large curvilinear synthetic aperture for 3-D target i...

引用

IET International Radar Conference 2009

作者： Su, Zhigang Wang, Yue Wu, Renbiao Peng, Yingning Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin 300300 China Department of Electronic Engineering Tsinghua University Beijing 100084 China

ISBN: (纸本)9781849190107

Parametric imaging methods for the curvilinear synthetic aperture radar (SAR) are always used the extracted three- dimensional (3-D) target feature (amplitude and 3-D position) to reconstruct the 3-D target image. Their efficient implementations, however, are only suitable for small synthetic aperture case. In this paper, a model is presented for describing the scatterer's echo received by large synthetic aperture, and based on this model, an efficient parametric method is proposed for imaging the 3-D target. The proposed method removes the coupling between the range and cross- range, which is introduced by range migration. With the decoupled data, the proposed method can replace the high dimensional search with a series of lower dimensional searches, which results in the feature estimates being extracted efficiently. The simulation results show that the method proposed in this paper can achieve the objective of the complex 3-D imaging, and the feature estimates can be reach the corresponding CRBs at low signal-to-noise ratio.

关键词： Synthetic aperture radar

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Rebar echo detection and suppression in runway using GPR

Rebar echo detection and suppression in runway using GPR

引用

6th International Conference on Radar, RADAR 2011

作者： Wu, Rebiao Zhong, Yuzhong Liu, Jiaxue Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin 300300 China Intelligent Information Institute of ATR Lab Shenzhen University Shenzhen 518060 China

ISBN: (纸本)9781424484416

Strong rebar echo which can't be eliminated in tx domain directly will disturb the detection and discrimination of the interested targets like cryptic disasters. This paper presents the application of Hyp-curvelet transform in detecting and suppressing rebar echo. Echoes from different targets are concentrated in their own apex coordinate but separated with each other in Hyp-curvelet space after transformed. The peak value in Hyp-curvelet space indicates the location of target. With some discrimination algorithm rebar's location could be obtained, and then its components in Hyp-curvelet space can be eliminated. In this way the reconstructed data will not contain rebar echo. Simulation results show that targets can be detected in low SNR condition, and rebar echo is rarely left over and diseases echoes are hardly any damaged in reconstructed data. © 2011 IEEE.

关键词： Echo suppression

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Reference data selection for ground bounce removal with ground penetrating radar

Reference data selection for ground bounce removal with grou...

引用

International Radar Symposium, IRS 2005

作者： Liu, Jiaxue Wu, Renbiao Li, Tang Li, Hongyu Zhang, Bei Huang, Jingxiong Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin300300 China College of Information Engineering Shenzhen University Shenzhen518060 China

Downward looking ground penetrating radar (GPR) has been considered a viable technology for landmine detection. For such a GPR with the antennas positioned very close to the ground surface, the reflections from the ground surface, i.e., the ground bounce, are very strong and can completely dominate the weak returns from shallowly buried non-metallic mines. Hence, one of the key challenges of using GPRs for landmine detection is to remove the ground bounce as completely as possible without altering the landmine return. The ground bounce varies with surface roughness and soil conditions and lead to performance degradation for many ground bounce removal algorithms without reference data selection. In this paper we introduce NHD-based reference data selection methods for ground bounce removal. Experimental results are provided to illustrate the performance of the proposed method.

关键词： Landmine detection

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Detection of the air maneuvering target based on the reconstruction of time sampling in the airborne radar

Detection of the air maneuvering target based on the reconst...

引用

6th International Conference on Radar, RADAR 2011

作者： Wu, Renbiao Wang, Xiaohan Li, Hai Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin 300300 China Intelligent Information Institute of ATR Lab Shenzhen University Shenzhen 518060 China

ISBN: (纸本)9781424484416

An algorithm for detection of the air maneuvering target based on the reconstruction of time sampling is proposed. Space sampling is used to reconstruct time sampling, which is equivalent to increasing the number of time sampling in one array element. So the problem that the estimation precision is low when using the fractional Fourier transform (FRFT) directly is solved, which is caused by the limited pulses transmitted by the airborne radar in a Coherent processing Interval (CPI). This algorithm improves the estimate precision significantly. Simulation results are provided to testify its validity. © 2011 IEEE.

关键词： Tracking radar

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Aircraft Avoidance of Suborbital Debris Hazard Zone Based on Lazy Theta* Algorithm

Aircraft Avoidance of Suborbital Debris Hazard Zone Based on...

引用

International Conference on Guidance, Navigation and Control, ICGNC 2022

作者： Chen, Wantong Diao, Tianru Yang, Qianqian Ren, Shiyu School of Electronic Information and Automation Civil Aviation University of China Tianjin300300 China Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin300300 China

ISBN: (纸本)9789811966125

During the intensive launch of suborbital vehicles, in order to meet the demand of short flight distance of civil aircraft and low workload of controllers, this paper proposes a redirect path planning method for suborbital debris hazard area based on Lazy Theta* algorithm. First, this paper uses the covariance propagation method to predict the propagation range of debris in a suborbital disintegration accident, converts the debris equation of motion into Gauss-Markov process, and constructs a probability ellipsoid using a probability density function to characterize the debris distribution. Second, this paper determines the mathematical boundaries of the projection of the probability ellipsoid of suborbital debris in the horizontal direction according to the acceptable risk probability for civil aviation and adopts the Divide-and-Conquer approach to delineate and extend the boundary of the suborbital debris hazard zone. Third, this paper considers constraints such as turning angle, flight segment length, and rerouting point, and uses the Lazy Theta* algorithm to plan a path with a short path length and few turns. Finally, the simulation results demonstrate that this method can quickly and effectively predict the propagation process of disintegrated debris of suborbital vehicles in complex atmospheric environments;in comparison with A* algorithm, the rerouting path length designed by the Lazy Theta* algorithm is reduced by an average of 2.35% and the number of rerouting points is reduced by an average of 92.04%, which meets the requirements of air traffic control. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Forecasting

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B-Spline Fusion Line of Sight Algorithm for UAV Path Planning

B-Spline Fusion Line of Sight Algorithm for UAV Path Plannin...

引用

International Conference on Guidance, Navigation and Control, ICGNC 2022

作者： Chen, Wantong Yang, Qianqian Diao, Tianru Ren, Shiyu School of Electronic Information and Automation Civil Aviation University of China Tianjin300300 China Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin300300 China

ISBN: (纸本)9789811966125

One of the key technologies to make UAVs intelligent is route planning. The traditional A* algorithm has a series of problems when performing UAV path planning, such as the planned path is not the actual optimal route, does not satisfy airworthiness criteria of UAV and so on. In paper, we come up with an A* improvement strategy based on B-sample fusion to improve the line of sight detection algorithm. Firstly, the line of sight detection algorithm is introduced and improved to optimize rationality of route planning at any angle. Second, to lessen the memory overhead and accelerate search speed, an adaptive cost function is used to decrease the amount of expansion points in the process of route planning. Finally, experimental simulation results make it clear that the revised approach suggested in this article is substantially faster than the standard A* algorithm in generating viable pathways in terms of planning efficiency and immediacy. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Unmanned aerial vehicles (UAV)

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