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

作者： Qiongqiong Jia Renbiao Wu Xiaoliang Wang Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China

ISBN: (纸本)9781467321969

As a source of clean energy, wind power has attracted great interests around the world. Recent research reveals that wind farms have serious impacts on air traffic control （ATC） radars, which may threaten flight safety in aviation. The most likely impact of wind farm on ATC radars is the echo from the wind farm may appear on the radar displays, which will mislead the air traffic controller and might result in tragedies. Consequently, it attracts much attention on how to suppress the wind farm clutter. For the listed reasons above, a method of wind farm clutter recognition and suppression is proposed in this paper. The proposed method utilized the periodicity of the radar scan and the stability of the wind farm location to create the dynamic clutter map, which was employed to recognize and suppress the wind farm clutter thereafter. Effectiveness of the new method is verified via simulation experiments.

关键词： Air Traffic Control (ATC) Primary surveillance radar (PSR) Wind turbine clutter Clutter Suppression Dynamic clutter map

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A novel strategy for fine-grained semantic verification of civil aviation radiotelephony read-backs

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Chinese Journal of Aeronautics 2022年第12期35卷 266-277页

作者： Guimin JIA Junxian LI Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of ChinaTianjin 300300China College of Electronic Information and Automation Civil Aviation University of ChinaTianjin 300300China

During the flight of the aircraft,the pilot must repeat the instruction sent by the controller,and the controller must further confirm these read-backs,in this way to further ensure the safety of air ***,fatigue,tension,negligence and other human factors may prevent the controller from realizing read-back errors in time,which is a huge hidden danger for the safety of civil aviation *** paper proposes a novel strategy to implement fine-grained semantic verification of radiotelephony read-backs by introducing interaction layer and attention mechanism at the output of BiLSTM *** with the traditional twochannel verification strategy,the interaction layer is added to obtain fine-grained semantic matching relation representation,rather than connecting the BiLSTM output vectors to obtain the overall semantic representation of the *** by adding attention layer,the new strategy can capture the potential semantic relation between the read-backs and the instructions,which is applicable to non-standard diction and abbreviated read-backs in real radiotelephony *** experiments are conducted and the results show that the proposed new strategy is more effective than the traditional method for read-backs checking,and the average test accuracy of the new strategy based on the Chinese ATC radiotelephony read-backs corpus can reach 93.03%.

关键词： Attention mechanism BiLSTM Interaction layer Radiotelephony read-backs Semantic verification

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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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A low-complexity spoofing detection and suppression approach for ADS-B 15

A low-complexity spoofing detection and suppression approach...

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

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

ISBN: (纸本)9781479989522

Automatic Dependent Surveillance-Broadcast (ADS-B) is vulnerable to spoofing interference which will lead to the failure of Air Traffic Management (ATM) systems. This paper proposed an effective approach to detect and suppress the spoofing interference based on a cross-antenna array without estimating the direction of arrival (DOA) of the received signal. Firstly, the location of target is received by the antenna array. Then the azimuth and the elevation according to the antenna array are obtained based on the locations of target and the central element of array. Secondly, the signal from the estimated direction is suppressed by projecting the received signal onto the orthogonal complement space of estimated steering vector. Finally, the target is recognized as a real target or spoofing according to the spoofing decision algorithm. The simulation results show the effectiveness of the proposed algorithm.

关键词： Vector spaces

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A multi-target track generation method based on ADS-B data 15

A multi-target track generation method based on ADS-B data

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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

?ADS-B IN and TCAS Once ADS-B IN technology can be achieved onboard, it can be used to replace conventional TCAS. ?Conventional track generation methods Kalman filtering, particle filtering, motion models and data min... 详细信息

ISBN: (纸本)9781479989522

关键词： Decoding

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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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Shadow removal using Retinex theory

Shadow removal using Retinex theory

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2011 3rd Chinese Conference on Intelligent Visual Surveillance, IVS 2011

作者： Ma, Guowen Yang, Jinfeng Tianjin Key Lab. of Advanced Signal Processing Civil Aviation University of China China

ISBN: (纸本)9781457718311

Shadows in images always cause problems to computer visual tasks, so how to remove shadow is an important topic of image processing. In this paper, we propose a new shadow removal method based on Retinex theory. We firstly use the gradient edge detection combined with 1-D illumination invariant image to detect the shadow area, then remove the shadow with Retinex algorithm, finally adjust the brightness of the shadow area. By transforming the RGB image into HSV space, we compute the average brightness of the non-shadow area in original image and shadow-free image, adjust the brightness of the image to coordinate with the original image. The experiment results show that our method can provide a good effect in shadow images. © 2011 IEEE.

关键词： Luminance

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Infrared Small Target Detection Algorithm Based on Improved DeeplabV3+ 8

Infrared Small Target Detection Algorithm Based on Improved ...

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8th International Conference on Intelligent Computing and signal processing, ICSP 2023

作者： Qi, Mengfei Jia, Guimin Civil Aviation University of China Tianjin Key Lab for Advanced Signal Processing Tianjin China

ISBN: (纸本)9798350302455

Infrared small target detection aims to segment small targets from the infrared images. Aiming at the problem of infrared small target detection, an improved algorithm is proposed based on DeeplabV3+ network. For the encoding part of DeeplabV3+, considering the small size of infrared small targets, the dilation rate of ASPP module is adjusted to capture the features of small targets more effectively. For the small targets are prone to lose spatial information during feature extraction, a location enhancement module is introduced to supplement accurate location information and to improve the accuracy of detection. In order to preserve detail information, an additional feature map is added from the backbone network to fuse detail information and semantic information for the decoding part of DeeplabV3+. Experimental results have demonstrated that the proposed algorithm is capable of enhancing the detection performance of DeeplabV3+ network in the infrared small target detection task. © 2023 IEEE.

关键词： Feature extraction

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The DME Interference Mitigation Based Wavelet Thresholding Algorithm for L-DACS Receiver 9

The DME Interference Mitigation Based Wavelet Thresholding A...

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9th International Conference on Intelligent Computing and signal processing, ICSP 2024

作者： Peng, Xiangqing Wang, Jiani Wang, Lei Liu, Haitao Civil Aviation University of China Tianjin Key Lab for Advanced Signal Processing Tianjin China

ISBN: (纸本)9798350376548

The L-DACS operates as an inlay system between two adjacent channels of the Distance Measuring Equipment (DME) system since the spectrum resources in the L-band are scarce and fragmented. This DME signal severely impacts the performance of L-DACS. This paper proposes an approach for mitigating DME interference by integrating spectrum aggregation technology and a wavelet thresholding algorithm. To enhance spectral efficiency, the method utilizes direct wideband aggregation technology at the transmission end to expand the bandwidth. Then, at the receiving end of Orthogonal Frequency Division Multiplexing (OFDM), the received signal is decomposed layer by layer using the wavelet threshold algorithm. The difference between the spectrum-aggregated signal and the DME signal in the wavelet domain is effectively identified to reconstruct the DME signal, thereby achieving interference elimination. Simulation results demonstrate that this method improves spectrum efficiency and data transmission rate while significantly mitigating DME interference, thereby enhancing the link transmission reliability of the L-DACS system. © 2024 IEEE.

关键词： Orthogonal frequency division multiplexing

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