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31 篇 会议

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检索条件"任意字段=Conference on Algorithms for Symthetic Aperture Radar Imagery XII"

共 31 条记录，以下是1-10 订阅

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FULLY AUTOMATIC OIL SPILL DETECTION FROM COSMO-SKYMED imagery USING A NEURAL NETWORK APPROACH

FULLY AUTOMATIC OIL SPILL DETECTION FROM COSMO-SKYMED IMAGER...

引用

conference on SAR Image Analysis, Modeling and Techniques xii

作者： Avezzano, Ruggero G. Del Frate, Fabio Latini, Daniele Univ Roma Tor Vergata Earth Observat Lab Rome Italy

ISBN: (纸本)9780819492760

The increased amount of available Synthetic aperture radar (SAR) images acquired over the ocean represents an extraordinary potential for improving oil spill detection activities. On the other side this involves a growing workload on the operators at analysis centers. In addition, even if the operators go through extensive training to learn manual oil spill detection, they can provide different and subjective responses. Hence, the upgrade and improvements of algorithms for automatic detection that can help in screening the images and prioritizing the alarms are of great benefit. In the framework of an ASI Announcement of Opportunity for the exploitation of COSMO-SkyMed data, a research activity (ASI contract L/020/09/0) aiming at studying the possibility to use neural networks architectures to set up fully automatic processing chains using COSMO-SkyMed imagery has been carried out and results are presented in this paper. The automatic identification of an oil spill is seen as a three step process based on segmentation, feature extraction and classification. We observed that a PCNN (Pulse Coupled Neural Network) was capable of providing a satisfactory performance in the different dark spots extraction, close to what it would be produced by manual editing. For the classification task a Multi-Layer Perceptron (MLP) Neural Network was employed.

关键词： SAR Oil spill detection COSMO-SkyMed Pulse Coupled Neural Networks (PCNN) image segmentation MLP Neural Networks X-Band

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Change detection using the synchronous impulse reconstruction (SIRE) radar

Change detection using the synchronous impulse reconstructio...

引用

conference on Radio Sensor Technology xii

作者： Ranney, Kenneth Nguyen, Lam Ressler, Marc Stanton, Brian Wong, David Koenig, Francois Tran, Chi Kirose, Getachew Martone, Anthony Smith, Greg Sichina, Jeff Kappra, Karl USA Res Lab Adelphi MD 20783 USA

ISBN: (纸本)9780819471383

Change detection provides a powerful tool for detecting the introduction of weapons or hazardous materials into an area under surveillance, as demonstrated in past work carried out at the Army Research Laboratory (ARL). This earlier work demonstrated the potential for detecting recently emplaced surface landmines using an X-Band, synthetic aperture radar (SAR) sensor. Recent experiments conducted at ARL have extended these change detection results to imagery collected by the synthetic impulse reconstruction (SIRE) radar-a lower-frequency system developed at ARL. In this paper we describe the algorithms adopted for this change detection experiment and present results obtained by applying these algorithms to the SIRE data set. Results indicate the potential for utilizing systems such as the SIRE as surveillance tools.

关键词： change detection forward-looking radar

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Analysis of jamming on Inverse Synthetic aperture radar (ISAR)

Analysis of jamming on Inverse Synthetic Aperture Radar (ISA...

引用

conference on algorithms for symthetic aperture radar imagery xii

作者： Han, ZA Pi, YM Yang, JY Univ Elect Sci & Technol China Dept Elect Engn Chengdu 610054 Peoples R China

ISBN: (纸本)0819457930

Inverse synthetic aperture radar (ISAR) is a powerful means in target identifying, especially the target in the air, which can image the moving target. There is little study on modeling and resistance technique according to ISAR in China. This paper establishes a model of ISAR system, and then studies on some valid jamming technique. This will provide us the valid technique support on ISAR resistance equipment later.

关键词： ISAR jamming resistance technique

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Change detection for multi-polarization, multi-pass SAR

Change detection for multi-polarization, multi-pass SAR

引用

conference on algorithms for symthetic aperture radar imagery xii

作者： Novak, LM BAE Syst Burlington MA 01803 USA

ISBN: (纸本)0819457930

This paper develops a unified mathematical theory of change detection for the multi-polarization, multi-pass synthetic aperture radar (SAR) change detection problem. A generalized likelihood ratio test (glrt) for optimum processing of the measured data is developed;an evaluation of the performance of the optimum glrt is also given in the form of ROC curves (PD versus PFA), quantifying the benefits of multi-polarization, multi-pass SAR change detection.

关键词： synthetic aperture radar polarimetric SAR change detection GLRT PWF

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Adaptive noise radar for simultaneous bistatic SAR and GMTI

Adaptive noise radar for simultaneous bistatic SAR and GMTI

引用

conference on algorithms for symthetic aperture radar imagery xii

作者： Rigling, BD Wright State Univ Dept Elect Engn Dayton OH 45435 USA

ISBN: (纸本)0819457930

The adaptive noise radar algorithm allows computation of compressed pseudo-pulses from a received noise radar signal at the receiver ADC rate. This is accomplished through use of LMS channel identification algorithms commonly exploited in wireless communications. This paper shows how having access to compressed pseudo-pulses at the ADC rate may be exploited to simultaneously implement SAR and GMTI modes in two parallel Doppler-processing chains. Simultaneous SAR and GMTI will aid in tracking of alternately moving and stationary targets.

关键词： SAR GMTI bistatic ground map noise waveform adaptive filtering LMS algorithm

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A parallel real-time computing-cluster implementation of spotlight SAR processing

A parallel real-time computing-cluster implementation of spo...

引用

conference on algorithms for symthetic aperture radar imagery xii

作者： Mathew, B Rabinkin, D MIT Lincoln Lab Lexington MA 02173 USA

ISBN: (纸本)0819457930

The high resolution imaging capability of Synthetic aperture radar (SAR) is largely unaffected by atmospheric conditions and has proven to be an indispensable asset in a variety of military and civilian applications. Application of SAR methodology for real-time imaging however carries with it the large computational complexity and storage requirements of the image-forming algorithms. Recently however, the rapidly diminishing cost of computing hardware and the related ascent of cluster-based computing, has made parallelization of these algorithms an appealing, area of investigation. This paper describes a parallel SAR processor developed at MIT Lincoln Laboratory. Several novel technologies were employed in it`s implementation, including pMatlab which is a parallel extension of standard Matlab that is also being developed at MIT Lincoln Laboratory. These technologies will be described later in the document. We begin with a brief description of the basic SAR algorithm.

关键词： Synthetic aperture radar radar Image processing Image resolution MATLAB Signal processing Antennas Data processing Image acquisition Parallel computing

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Random subspaces and SAR classification efficacy

Random subspaces and SAR classification efficacy

引用

conference on algorithms for symthetic aperture radar imagery xii

作者： Waagen, D Shah, N Ordaz, M Cassabaum, M Raytheon Co./Missile Systems (United States)

ISBN: (纸本)0819457930

The 'curse of dimensionality' has limited the application of statistical modeling techniques to low-dimensional spaces, but typical data usually resides in high-dimensional spaces (at least initially, for instance images represented as arrays of pixel values). Indeed, approaches such as Principal Component Analysis and Independent Component Analysis attempt to extract a set of meaningful linear projections while minimizing interpoint distance distortions. The counterintuitive yet effective random projections approach of Johnson and Lindenstrauss defines a sample-based dimensionality reduction technique with probabilistically provable distortion bounds. We investigate and report on the relative efficacy of two random projection techniques for Synthetic aperture radar images in a classification setting.

关键词： random projections dimensionality reduction distance preserving projections synthetic aperture radar classification

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SAR imaging from partial-aperture data with frequency-band omissions

SAR imaging from partial-aperture data with frequency-band o...

引用

conference on algorithms for symthetic aperture radar imagery xii

作者： Çetin, M Moses, RL MIT Lab Informat & Decis Syst Cambridge MA 02139 USA

ISBN: (纸本)0819457930

We consider the problem of wide-angle SAR imaging from data with arbitrary frequency-band omissions. We propose an approach that involves composite image formation through combination of subaperture images, as well as point-enhanced, superresolution image reconstruction. This framework provides a number of desirable features including preservation of anisotropic scatterers that do not persist over the full wide-angle aperture;robustness to bandwidth limitations and frequency-band omissions;as well as a characterization of the aspect dependence of scatterers. We present experimental results based on the Air Force Research Laboratory (AFRL) "Backhoe Data Dome," demonstrating the effectiveness of the proposed approach.

关键词： synthetic aperture radar wide-angle imaging sparse-aperture imaging feature-enhanced imaging inverse problems superresolution

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Three-dimensional target visualization from wide-angle IFSAR data

Three-dimensional target visualization from wide-angle IFSAR...

引用

conference on algorithms for symthetic aperture radar imagery xii

作者： Moses, RL Adams, P Biddlecome, T Ohio State Univ Dept Elect & Comp Engn Columbus OH 43210 USA

ISBN: (纸本)0819457930

We consider the problem of developing three-dimensional (3D) spatial representations of objects by processing sparse, wide-angle radar measurements of that object. We propose an approach in which multiple interferometric SAR (IFSAR) image pairs are obtained, each using a modest angular aperture. Each IFSAR image pair is used to extract 3D scattering locations and attributes, and these points are noncoherently combined to form object reconstructions. Volume rendering methods are employed to represent these spatial points and their attributes. Reconstruction results are presented using synthetically-generated, wide-angle scattering data of a backhoe.

关键词： synthetic aperture radar three-dimensional reconstruction visualization

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Multi-baseline IFSAR study using an SBR based simulator

Multi-baseline IFSAR study using an SBR based simulator

引用

conference on algorithms for symthetic aperture radar imagery xii

作者： Bhalla, R Ling, H SAIC Burlington MA 01803 USA

ISBN: (纸本)0819457930

This paper describes the results of a multi-baseline IFSAR study using a shooting and bouncing ray (SBR) based IFSAR simulator. The SBR technique has been used in the past for 2-D SAR and IFSAR simulations. This paper extends on those approaches for modeling multi-baseline IFSAR images. IFSAR gives the height estimate for a target and hence leads to a 3-D image of the target. The 3-D reconstruction is dependent on the choice of IFSAR sensor parameters. We present a tradeoff study the sensor resolution versus the number of baselines using the SBR based simulator.

关键词： SAR IFSAR radar imaging electromagnetic scattering

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