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检索条件"任意字段=5th Sensor Signal Processing for Defence, SSPD 2015"

共 59 条记录，以下是21-30 订阅

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High resolution ISAR processing using real data: ISAR-to-SAR approach 5

High resolution ISAR processing using real data: ISAR-to-SAR...

引用

5th IEEE Asia-Pacific Conference on Synthetic Aperture Radar, APSAR 2015

作者： Song, Jung-Hwan Lee, Woo-Kyung Jung, Chul H. Department of Avionics Korea Aerospace University Seoul Korea Republic of Wireless Technology Lab. SOLiD Systems Inc. Seoul Korea Republic of

ISBN: (纸本)9781467372961

In this paper, a novel high resolution inverse synthetic aperture radar (ISAR) processing technique is proposed. the proposed method employs sub-aperture recombination scheme such that target features can be effectively preserved even for wide aperture data. the proposed ISAR-to-SAR approach is introduced and Doppler history based motion compensation is described. In order to evaluate the proposed algorithm in real environment, we developed an experimental ISAR system. the proposed algorithm is implemented in system hardware and ground processor to apply to the generated ISAR data. Extensive field works have been conducted to obtain the ISAR raw data of aircraft target and the results are finally suggested in detail. © 2015 IEEE.

关键词： Motion compensation

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A Sub-aperture Imaging Algorithm for Highly Squinted SAR Based on Frequency Phase Correction 5

A Sub-aperture Imaging Algorithm for Highly Squinted SAR Bas...

引用

IEEE 5th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)

作者： Li, Zhenyu Liang, Yi Xing, Mengdao Wu, Jun Xidian Univ Natl Lab Radar Signal Proc Xian Peoples R China Aviat Ind Corp China Xian Flight Automat Control Res Inst Xian Peoples R China

ISBN: (纸本)9781467372978

A new approach of highly squinted SAR subaperture data processing is proposed in this paper. Under the condition of the sub-aperture characteristics, this paper presents a frequency phase correction algorithm (FPCA) for focusing SAR sub-aperture data acquired at a high squint angle and wide azimuth swath width. By introducing a disturbing phase in the azimuth frequency domain, the FPCA eliminates the azimuth-dependent frequency modulation (FM) rate and improves the final image quality effectively. the whole procedure only involves fast Fourier transforms (FFTs) and complex multiplications, with interpolation free, simulated results and raw data processing validate the effectiveness of the proposed algorithm.

关键词： highly squinted SAR sub-aperture frequency phase correction algorithm (FPCA)

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Blind Hyperspectral Denoising 5

Blind Hyperspectral Denoising

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5th National Conference on Computer Vision, Pattern Recognition, Image processing and Graphics (NCVPRIPG)

作者： Aggarwal, Hemant Kumar Majumdar, Angshul Indraprastha Inst Informat Technol Delhi New Delhi India

ISBN: (纸本)9781467385640

In this work we propose a new formulation for hyperspectral denoising based on the Blind Compressed Sensing (BCS) framework. BCS learns the sparsifying basis during signal recovery combining the advantages of standard sparse recovery with dictionary learning. We show that our proposed formulation yields better results than a state-of-the-art technique hyperspectral denoising both in terms of PSNR (more than 1dB improvement) and visual quality.

关键词： signal reconstruction

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Non Line of Sight signal analysis: investigation of interferometry modes over urban area 5

Non Line of Sight signal analysis: investigation of interfer...

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IEEE 5th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)

作者： Nouvel, Jean Francois Dupuis, Xavier Lesturgie, Marc ONERA Csp DEMR RIM Salon De Provence France Off Natl Etud & Rech Aerosp DEMR Palaiseau France

ISBN: (纸本)9781467372978

Due to complex geometry (urban canyons generate multiple scattering) SAR images are difficult to interpretate on urban areas. In order to characterize Non Line Of Sight (NLOS) scattering phenomenon at Ka band, measurement campaigns have been performed using the ONERA BUSARD motor glider and a dedicated Ka band SAR sensor. From 2011 to 2014 a large number of measurements flights have been done, leading to the acquisition of a radar dataset that covers different geometries and different acquisition modes: Single channel, cross-track or along-track interferometry modes. NLOS radar echoes have been investigated on two types of materials: concrete and metallic walls and different geometries of acquisition. NLOS echoes observation has been validated in various cases and interferometry modes have been proved to be efficient in NLOS echoes detection and validation.

关键词： Ka band BUSARD NLOS interferometry

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Optical oxygen sensor based on time-resolved fluorescence 5

Optical oxygen sensor based on time-resolved fluorescence

引用

5th Asia-Pacific Optical sensors Conference (APOS)

作者： Chu, Cheng-Shane Chu, Ssu-Wei Ming Chi Univ Technol Dept Mech Engn New Taipei City Taiwan

ISBN: (纸本)9781628418651

A new, simple signal processing, low-cost technique for the fabrication of a portable oxygen sensor based on time-resolved fluorescence is described. the sensing film uses the oxygen sensing dye platinum meso-tetra (pentfluorophenyl) porphyrin (PtTFPP) embedded in a polymer matrix. the experimental results reveal that the PtTFPP-doped oxygen sensor has a sensitivity of 2.2 in the 0-100% range. A preparation procedure for coating the photodiodes with the oxygen sensor film that produces repetitive and reliable sensing devices is proposed. the developed time-resolved optical oxygen sensor is portable, low-cost, has simple signal processing, and lacks optical filter elements. It is a cost-effective alternative to traditional electrochemical-based oxygen sensors and provides a platform for other optical based sensors.

关键词： optical oxygen sensor time-resolved fluorescence PtTFPP polymer

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Small-Aperture Imaging for High Squint SAR based on Modified Omega-K Algorithm 5

Small-Aperture Imaging for High Squint SAR based on Modified...

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IEEE 5th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)

作者： Huai, Yuanyuan Liang, Yi Xing, Mengdao Ma, Xiaorui Xidian Univ Natl Lab Radar Signal Proc Xian Peoples R China Chinese Acad Sci Inst Software Beijing Peoples R China

ISBN: (纸本)9781467372978

For high squint SAR small-aperture data imaging, the conventional Omega-K algorithm will confront two main problems. First, since the data support region (DSR) in the two-dimension (2-D) wavenumber domain is skew, the conventional algorithm cannot exploit the DSR efficiently enough and degrades the resolution when choosing the square region to process. Second, the small-aperture data can only offer short DSR of the azimuth position. When imaging in the azimuth distance domain, the images will result in serious blurring in azimuth direction unless padding large number of zeroes. Correspondingly, to solve such problems, the modified Omega-K algorithm contains mainly two parts, the "No-Squint" processing, which corrects the skew DSR to maximize the selection area;And the Small-aperture data imaging processing, which enable the azimuth focus in wavenumber domain, eliminating the azimuth blurring. Experiments show the validity and effectiveness of the proposed algorithm.

关键词： Wavenumber domain high squint small-aperture data

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Detection of slow and fast moving targets using hybrid CD-DMTF SAR GMTI mode 5

Detection of slow and fast moving targets using hybrid CD-DM...

引用

IEEE 5th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)

作者： Sjogren, thomas Vu, Viet Swedish Def Res Agcy FOI Sensor & Elect Warfare Syst Linkoping Sweden Blekinge Tekniska Hogskola TIMN Karlskrona Sweden

ISBN: (纸本)9781467372978

TerraSAR-X and TanDEM-X has since 2014 been flying in the monostatic pursuit mode. this mode consists of a formation flying with the satellites having identic orbit, but with a displacement in along-track of a distance corresponding to 10 s delay. Such formation gives e.g. the ability to detect movements of very slow targets or targets standing still and moving between measurements. Depending on the integration time for each satellite and the time separation between the satellites, the clutter may behave as stationary or non-stationary. this allows for the possibility to apply either coherent or incoherent change detection algorithms. As has been proved earlier, the potential of coherent change detection has very good abilities but has proven difficult to obtain on X-band. In the case of very high resolution SAR, there will also be a target smearing effect due to the target movement within the coherent processing interval (CPI). the target defocusing effect may also be used for detection of moving targets in the scene using the so-called Detection of Moving Targets by Focusing (DMTF) technique. this is since an estimate or hypothesis test for target movements can be used to reprocess the SAR image and obtain a signal-To-Clutter-Noise (SCNR) gain, thus increase chances for moving target detection. therefore, a combination of DMTF and change detection over short times is promising. As such, this paper investigates the potential of the monostatic pursuit mode for GMTI.

关键词： Synthetic Aperture Radar Change Detection Moving Target Detection DMTF Satellite SAR TerraSAR-X TanDEM-X Monostatic Pursuit Mode Staring Spolight Mode

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A Novel Method for Multi-targets ISAR Imaging 5

A Novel Method for Multi-targets ISAR Imaging

引用

IEEE 5th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)

作者： Liu, Lei Zhou, Feng Guo, Yongqiang Tao, Mingliang Sun, Pange Zhang, Zijing Xidian Univ Natl Lab Radar Signal Proc Xian Peoples R China Beijing Inst Tracking & Telecommun Technol Beijing Peoples R China

ISBN: (纸本)9781467372978

A novel multi-targets ISAR imaging method based on particle swarm optimization (PSO) and modified CLEAN technique is proposed in this paper. First, multi-targets are modeled as several separated group-targets in which translational motion of each target is analogous. And then, translational motion of each group-target is modeled as a polynomial, and the polynomial coefficient is estimated via PSO. then focused image of the group-target can be obtained and extracted via a modified CLEAN technique. Meanwhile, each target can be segmented and extracted based on clustering number estimation and K-means clustering algorithm. Finally, better focused image of each target would be obtained through further traditional mono-target imaging processing. Experimental results verify the validity of the proposed method.

关键词： Inverse synthetic aperture radar (ISAR) multi-targets particle swarm optimization (PSO) modified CLEAN clustering algorithm

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Evaluation of design parameters for a reflection based long-Term pulse oximetry sensor

Evaluation of design parameters for a reflection based long-...

引用

5th EAI International Conference on Wireless Mobile Communication and Healthcare - Transforming Healthcare through Innovations in Mobile and Wireless Technologies, MOBIHEALth 2015

作者： Bideaux, A. Schwendemann, T. Hey, S. Karlsruhe Germany

ISBN: (纸本)9781631900884

Pulse oximetry is a standard parameter for many years in clinical patient monitoring. there are also sensors that can be used at home. But all these sensors use the transmission based method to measure the oxygen saturation which require finger or ear clips that are uncomfortable and confining and therefore not fit for long-Term monitoring. Sleep-related breathing disorders or breathing thin air in high altitudes can lead to insufficient oxygen intake. Insufficient oxygen supply can cause permanent damage to the tissue and in some cases even death. For early ambulatory diagnosis, a reflection based long-Term pulse oximetry sensor would be the best solution. there are no available devices on the market, even so many studies showed promising results. that why, we evaluated design parameters for a reflection based long-Term pulse oximetry sensor, located at the wrist. the prototype we developed consists of two LEDs (one red and one infrared), a photodiode and the evaluation board SLAU480B from Texas Instruments. We tested three sensor layouts and discovered that the distance between the LEDs and the photodiode, the contact pressure and motion artefacts were the most important signal influencing parameters. After the signal processing we obtained a signal to noise ratio of 22 dB (red) and 30 dB (infrared) and a AC/DC ratio of 1-3 %, which should be more than enough to calculate the SpO2 value. Also motion artifacts were tested and seem to affect the measurement at the lower wrist strongly. In conclusion we found some reasons why there is no such device on the market yet. Copyright © 2015 ICST.

关键词： Photodiodes

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Weighted Fast Dynamic Time Warping Based Multi-View Human Activity Recognition Using a RGB-D sensor 5

Weighted Fast Dynamic Time Warping Based Multi-View Human Ac...

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5th National Conference on Computer Vision, Pattern Recognition, Image processing and Graphics (NCVPRIPG)

作者： Agarwal, Ishan Kushwaha, Alok Kumar Singh Srivastava, Rajeev Jaypee Inst Informat Technol Dept Comp Sc & Engn Noida UP India Indian Inst Technol BHU Dept Comp Sc & Engn Varanasi 221005 Uttar Pradesh India

ISBN: (纸本)9781467385640

In this paper, a real time multi-view human activity recognition model using a RGB-D (Red Green BlueDepth) sensor is proposed. the method receives as input RGBD data streams in real time from a Kinect for Windows V2 sensor. Initially, a skeleton-tracking algorithm is applied which gives 3D joint information of 25 unique joints. the presented approach uses a weighted version of the Fast Dynamic Time Warping that weighs the importance of each skeleton joint towards the Dynamic Time Warping (DTW) similarity cost. To recognize multi-view human activities, the weighted Dynamic TimeWarping warps a time sequence of joint positions to reference time sequences and produces a similarity value. Experimental results demonstrate that the proposed method is robust, flexible and efficient with respect to multiple views activity recognition, scale and phase variations activities at different realistic scenes.

关键词： RGB-D sensor Skeletal Tracking Human Activity Recognition Microsoft Kinect V2

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