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Range migration-based Doppler ambiguous integer estimation for moving targets with azimuth spectrum aliasing 6

Range migration-based Doppler ambiguous integer estimation f...

引用

6th Asia-Pacific Conference on Synthetic Aperture Radar, APSAR 2019

作者： Zhang, Ying Xiong, Wei Dong, Xichao Hu, Cheng Liu, Chengxiang Sun, Yang Science and Technology on Complex Electronic System Simulation Laboratory Space Engineering University Beijing China School of Information and Electronics Beijing Institute of Technology Beijing China

ISBN: (纸本)9781728129129

In some case, the azimuth spectrum bandwidth is larger than the pulse repetition frequency (PRF), leading to a whole azimuth spectrum has been folded into multiple subsegments and aliased. Therefore, the traditional Doppler ambiguous integer estimation method cannot be used directly. In this paper, the influence of Doppler ambiguous integer on residual range migrations' slope is analyzed. Based on the slope, the Doppler ambiguous integer estimation method for moving targets with azimuth spectrum aliasing is given. From the simulation results, the Doppler ambiguous integer can be estimated accurately by proposed method. © 2019 IEEE.

关键词： Synthetic aperture radar

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Design and optimization of dot pattern in illumination lightpipe of natural light guiding system

Design and optimization of dot pattern in illumination light...

引用

SPIE Optical Engineering + Applications

作者： Lee, Zong-Yi Chen, Yi-Yung Whang, Allen Jong-Woei Photonics System Simulation and Design Laboratory Department of Electronic Engineering National Taiwan University of Science and Technology Taipei 106 Taiwan Photonics System Simulation and Design Laboratory Department of Electro-Optical Engineering National Taiwan University of Science and Technology #43 Sec. 4 Keelung Rd. Taipei 106 Taiwan

ISBN: (纸本)9780819477194

In recent years, the practicality and importance of the illumination with sunlight are getting more seriously concern in public. The reason is that natural light is non-polluting, energy-saving, and healthy in comparison with traditional light sources. Therefore, our research focuses on how to replace the artificial sources by natural light. A Natural Light Guiding system has collecting, transmitting, and lighting parts. For replacing the traditional sources, the lighting part should have similar characteristic, such as intensity distribution and geometric parameters, to artificial sources. In this paper, we design, simulate, and optimize illumination lightpipe with dot pattern to redistribute the collecting sunlight from Natural Light Guiding system. The lightpipe includes input, system, and output parts. In the input part, we design a coupler to improve the coupling efficiency with natural light. For optimizing the efficiency of the coupler, we evaluate the relationship between the distance that is from the fiber to the lightpipe and the coupled power. In the system part, the sunlight is locked by total internal reflection, TIR, so we design dot pattern to scatter the locked sunlight for uniform lighting. In the output part, a uniform illumination is our goal. For designing the percentage of the surface will be covered by dot pattern, we offer a design theory and simulate the efficiency. © 2009 Copyright SPIE - The International Society for Optical Engineering.

关键词： Refractive index

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A beam splitter of natural light guiding system based on dichroic prism for ecological illumination

A beam splitter of natural light guiding system based on dic...

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SPIE Optical Engineering + Applications

作者： Li, Yu-Chi Chen, Yi-Yung Whang, Allen Jong-Woei Photonics System Simulation and Design Laboratory Department of Electro-Optical Engineering National Taiwan University of Science and Technology Taipei 106 Taiwan Photonics System Simulation and Design Laboratory Department of Electronic Engineering National Taiwan University of Science and Technology #43 Sec. 4 Keelung Rd. Taipei 106 Taiwan

ISBN: (纸本)9780819477194

In thremmatology, many researches focus on ecological illumination for improving the growing speed of animal or plant. According to the Trichromatic theory, any specific color can be made up of red, green, and blue light. Sunlight has full spectrum so it is the most applicable source. A Natural Light Guiding system includes collecting, transmitting, and lighting parts. In our research, we would like to design a beam splitter in the transmitting part to separate the sunlight into red, green, and blue light for ecological illumination. We use high pass and low pass dichroic coatings in a prism, called dichroic prism, to be the beam splitter to separate the wavelength. For measuring the spectra of the exit beams, we build a space with the Natural Light Guiding system. In the space, the spectra of sunlight outside and inside the space and the exit beams of the beam splitter are measured. Finally, we use prismatic structure to design the beam splitter, and optimize the surface of the element with aspheric surface and Fresnel surface to reduce the beam angle of exit light. © 2009 Copyright SPIE - The International Society for Optical Engineering.

关键词： Optical instruments

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An optical switch of natural light guiding system based on cubic structure with Fresnel surface

An optical switch of natural light guiding system based on c...

引用

SPIE Optical Engineering + Applications

作者： Chou, Kao-Hsu Chen, Yi-Yung Whang, Allen Jong-Woei Photonics System Simulation and Design Laboratory Department of Electronic Engineering National Taiwan University of Science and Technology Taipei 106 Taiwan Photonics System Simulation and Design Laboratory Department of Electro-Optical Engineering National Taiwan University of Science and Technology #43 Sec. 4 Keelung Rd. Taipei 106 Taiwan

ISBN: (纸本)9780819477187

Recently, many researches focus on illumination with sunlight for saving energy and healthy lighting. A Natural Light Guiding system has collecting, transmitting, and lighting parts. In most systems, the paths on transmitting part are fixed so the collected sunlight of the Natural Light Guiding system can not be free managed and is sometime wasted. In this paper, we design an optical switch to change the path of the collected sunlight on the transmitting sunlight. The switch is cubic structure that includes a 45 degree mirror for reflecting sunlight. According to the structure of the optical switch, we can rotate the switch to manage the path of the collected sunlight. When the path is parallel with the mirror, the sunlight will pass through the switch;and when the included angle between the path and mirror is 45 degree, we can change the path of light. For coupling the exit beam into lightpipe, we design the surfaces of cubic structure to be aspheric surface with Fresnel surface. Finally, we simulate the efficiency of the optical switch when the path is changed by the mirror. © 2009 Copyright SPIE - The International Society for Optical Engineering.

关键词： Lighting

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MTL-JER: Meta-Transfer Learning for Low-Resource Joint Entity and Relation Extraction 3

MTL-JER: Meta-Transfer Learning for Low-Resource Joint Entit...

引用

3rd International Conference on Neural Networks, Information and Communication Engineering, NNICE 2023

作者： Peng, Da Pei, Zhongmin Mo, Delin Space Engineering University Science and Technology on Complex Electronic System Simulation Laboratory Beijing China Institute of War Studies Academy of Military Sciences

ISBN: (纸本)9798350335972

Joint entity and relation extraction has achieved impressive advances in NLP, such as document understanding and knowledge graph construction. The typical methods for entity and relation extraction typically break down the joint task into several smaller components or stages for ease of implementation, but this leads to a loss of the interconnected knowledge in the triple. Hence, we propose to model the triple in one module jointly. Furthermore, the labeling of a joint entity and relation extraction tasks is costly and domain-specific;therefore, it is important to improve its performance on low-resource data and domain adaption. To address this issue, we suggest using two sources that are rich in information, namely pre-trained models on large data and multi-domain text corpora. Pretraining allows us to provide the model with the fundamental ability to perform joint entity and relationship extraction. Second, through meta-learning on multi-domain text, we can improve the model's generalization capabilities, enabling it to perform well even with limited data. We present MTL-JER, a Meta-Transfer Learning method for Joint Entity and Relation Extraction in low-resource settings in this paper. Using exhaustive experiments on five datasets, we prove that our model obtains optimal results. © 2023 IEEE.

关键词： Extraction

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The Comparison of Different Visual Features for Visual Odometry

The Comparison of Different Visual Features for Visual Odome...

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2018 IEEE CSAA Guidance, Navigation and Control Conference, CGNCC 2018

作者： Jiang, Yuehan Wang, Qing Dong, Chaoyang Zhou, Min Zhong, Kewei Beihang University School of Automation Science and Electrical Engineering Beijing100191 China Science and Technology on Special System Simulation Laboratory Beijing Simulation Center Beijing100854 China Shanghai Aerospace Control Technology Institute Shanghai201100 China

ISBN: (纸本)9781538611715

For robots to work effectively, the availability of a map with detailed information surrounding the workspace is an important requirement for indoor and outdoor tasks. This is usually achieved with using visual odometry techniques with feature-based methods. In this paper, we compare the performance of three different feature extraction methods: Scale Invariant Feature Transform (SIFT), Speed Up Robust Features (SURF) and Oriented FAST Rotated BRIEF (ORB). This paper presents experimental results on standard evaluation datasets and all experiments use measurement of the number of image correspondences as well as the ratio of good matched for the evaluation purpose. The results of experiments demonstrate that the performances of three methods in processing time, matching capability and accuracy. SIFT presents its stability in most scenarios although it is very slow. SURF is faster than SIFT and outperform SIFT on some scenarios. ORB is the most efficient feature and shows strong performance. © 2018 IEEE.

关键词： Vision

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Design method of secondary optical element for LED applications

Design method of secondary optical element for LED applicati...

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SPIE Optical Engineering + Applications

作者： Chen, Yi-Yung Whang, Allen Jong-Woei Photonics System Simulation and Design Laboratory Department of Electronic Engineering National Taiwan University of Science and Technology Taipei 106 Taiwan Photonics System Simulation and Design Laboratory Department of Electro-Optical Engineering National Taiwan University of Science and Technology #43 Sec. 4 Keelung Rd. Taipei 106 Taiwan

ISBN: (纸本)9780819477187

Light Emitting Diode, LED, has many advantages in many lighting applications, such as general illumination, street light, and auto lamp. In general, each application needs to do secondary optical design for its specific request. A secondary optical element can be separated into refractive and reflective part. In this paper, we present a design procedure of secondary optical design with intensity distribution of LED and sequential ray tracing. The method suits the both designs of refractive and reflective parts. In the first process, we integrate the series function of intensity distribution in spherical coordinate with a range of solid angle. In the second process, we calculate the redistribution parameters of luminous flux by the geometric parameters of LED, element, and detector. In the final process, we use ray tracing method to design the optical element by aspheric surface. The surface of the refractive part in secondary optical element could be Fresnel surface for reducing the thickness of element. For proving the design procedure, we design a secondary optical element of LED by this method with an illumination request. © 2009 Copyright SPIE - The International Society for Optical Engineering.

关键词： Light emitting diodes

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LEO Satellite Network Traffic Forecasting based on ARIMA-BPNN Model 3

LEO Satellite Network Traffic Forecasting based on ARIMA-BPN...

引用

3rd International Conference on Electronic Information Engineering and Computer Communication, EIECC 2023

作者： Han, Chi Xiong, Wei Yu, Ronghuan Fu, Jingyu Space Engineering University Science and Technology on Complex Electronic System Simulation Laboratory Beijing China Jiuquan Satellite Launch Center Jiuquan China

ISBN: (纸本)9798350359961

Satellite network traffic forecasting provides key information for routing and resource allocation, which is important for the efficient operation of satellite network. However, due to the self-similarity and long-range dependence (LRD) of satellite network traffic, traditional linear or non-linear network traffic forecasting models cannot achieve sufficient forecasting accuracy. A combined model of satellite network traffic forecasting based on BPNN and ARIMA is proposed. BPNN is adopted to forecast the residuals. EMD-ARIMA and BPNN forecasting results are combined to achieve satellite network traffic forecasting. Experimental results on the satellite network traffic data generated by the ON/OFF model show that forecast accuracy of the proposed method is better than traditional model, which verifies the effectiveness of the proposed satellite network traffic forecast model. © 2023 IEEE.

关键词： BP neural network empirical mode decomposition intrinsic mode function long-range dependence satellite network

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An active lighting module with natural light guiding system and solid state source for indoor illumination

An active lighting module with natural light guiding system ...

引用

9th International Conference on Solid State Lighting

作者： Chen, Chi-An Chen, Yi-Yung Whang, Allen Jong-Woei Photonics System Simulation and Design Laboratory Department of Electro-Optical Engineering National Taiwan University of Science and Technology #43 Keelung Rd. Taipei 106 Taiwan Photonics System Simulation and Design Laboratory Department of Electronic Engineering National Taiwan University of Science and Technology #43 Keelung Rd. Taipei 106 Taiwan

ISBN: (纸本)9780819477125

Recently, many researches focus on healthy lighting with sunlight. A Natural Light Guiding system includes collecting, transmitting, and lighting parts. In general, the lighting module of the Natural Light Guiding system only uses scattering element, such as diffuser, to achieve uniform illumination. With the passive lighting module, the application of the Natural Light Guiding system is limited because sunlight is dynamic source. When the sunlight is weak at morning, at evening, or on cloudy day, the illumination system is fail. In this paper, we provide an active lighting module that includes the lighting part of Natural Light Guiding system, LED auxiliary sources, optical elements, and optical detector. We use optical simulation tool to design and simulate the efficiency of the active module. The optical element can redistribute the sunlight only, LED light only, or sunlight with LED light to achieve uniform illumination. With the feedback of the detector, the active lighting module will adjust the intensity of LED to provide a steady illumination. Moreover, the module could replace the backlight module of LCD TV when the house has Natural Light Guiding system for saving energy and higher performance of image. © 2009 SPIE.

关键词： Light emitting diodes

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Using prismatic structure and brightness enhancement film to design cascadable unit of static solar concentrator in natural light guiding system

Using prismatic structure and brightness enhancement film to...

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SPIE Optical Engineering + Applications

作者： Yang, Shu-Hua Chen, Yi-Yung Whang, Allen Jong-Woei Photonics System Simulation and Design Laboratory Department of Electronic Engineering National Taiwan University of Science and Technology Taipei 106 Taiwan Photonics System Simulation and Design Laboratory Department of Electro-Optical Engineering National Taiwan University of Science and Technology #43 Sec. 4 Keelung Rd. Taipei 106 Taiwan

ISBN: (纸本)9780819477132

Due to the energy crisis, the principle of green energy gains popularity. This leads the increasing interest in renewable energy such as solar energy. How to collect sunlight for indoor illumination is our ultimate target. A Natural Light Guiding system includes collecting, transmitting, and lighting parts. To date, most studies of collecting part have delicate in dynamic concentrators which include sun tracking systems. They are powered by small electric motors and require some type of control module to follow sun path, so it requires maintenance and adds a good bit of complexity to the system. The application area of dynamic concentrator is limited. In order to create a low cost, easily set up, and applied on large area structure, we design a unit of static concentrator to collect sunlight for indoor illumination which is prismatic and cascadable. The unit is made up of prismatic structure and can collect the nature light, sunlight, for indoor illumination. For offer more saving energy and more stable illumination, we consider the total collected energy in the whole day and the relationship between the efficiency of the static concentrator and time. We change the size of prism to be different and add the BEF structure to improve the unit. According to the simulation, the prismatic structure with different right-angle prism could advance the total collected energy and the BEF could advance the stabilization of efficiency in the whole day. © 2009 Copyright SPIE - The International Society for Optical Engineering.

关键词： Luminance

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