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检索条件"任意字段=Conference on Algorithms for Synthetic Aperture Radar Imagery II"

共 987 条记录，以下是11-20 订阅

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algorithms for synthetic aperture radar imagery ii

Algorithms for Synthetic Aperture Radar Imagery II

引用

algorithms for synthetic aperture radar imagery ii 1995

The proceedings contain 38 papers. The topics discussed include: tomographic imaging of radar data gathered on a circular flight path about a three-dimensional target zone;multiaperture ultrawideband SAR processing with polarimetric diversity;analytical framework for determining the robustness of linear feature mapping for target detection;ultrawideband SAR signature investigations based on electromagnetic models and measurements;near-least-squares radio frequency interference suppression;interference suppression in UHF synthetic aperture radar;RF interference suppression in ultrawideband radar receivers;and radio and tv interference extraction for ultrawideband radar.

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Interference suppression in UHF synthetic-aperture radar 2

Interference suppression in UHF synthetic-aperture radar

引用

conference on algorithms for synthetic aperture radar imagery ii

作者： FERRELL, BH LORAL DEF SYST ARIZONA DIVLITCHFIELD PKAZ 85340

ISBN: (纸本)0819418404

Under Advanced Research Prjects Agency (ARPA) sponsorship, Loral Defense Systems, Arizona has developed algorithms and techniques for suppressing radio frequency interference (RFI) in radar signals. These techniques use conventional signal processing elements in an unconventional manner to localize the RFI energy in a domain where it can be easily distinguished from radar returns and removed from the radar data with minimal effect on coherent radar signal image formation processing. Significantly improved synthetic-aperture radar (SAR) images have been obtained using these techniques. Flight tests of a Loral airborne SAR system operating from 500 to 800 MHz have provided the SAR data used to develop and refine these RFI suppression techniques.

关键词： synthetic-aperture radar SAR RADIO FREQUENCY INTERFERENCE RFI radar SIGNAL PROCESSING IMAGE FORMATION PROCESSING

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SAR imaging and multiresolution analysis 2

SAR imaging and multiresolution analysis

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conference on algorithms for synthetic aperture radar imagery ii

作者： BEYLKIN, G GORMAN, JD LIFLISS, S RICOY, MA UNIV COLORADO PROGRAM APPL MATHBOULDERCO 80309

ISBN: (纸本)0819418404

Many synthetic aperture radar (SAR) image formation algorithms require the computation of a multidimensional Fourier transform of irregularly sampled or unequally spaced data samples. We apply a recently developed algorithm, the unequally spaced FFT (USFFT), to SAR image formation and compare its accuracy and complexity to a conventional algorithm. We find that the USFFT algorithm allows comparable accuracy to traditional approaches at a slightly reduced computational cost. We briefly discuss extensions of the USFFT algorithm to multiresolution SAR imaging.

关键词： synthetic aperture radar IMAGE RECONSTRUCTION MULTIRESOLUTION ANALYSIS

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Topographic mapping using Interferometric synthetic aperture radar 2

Topographic mapping using Interferometric Synthetic Aperture...

引用

conference on algorithms for synthetic aperture radar imagery ii

作者： GIGLIO, D CARLISLE, R SENSOR TECHNOL OFF ADV RES PROJECTS AGCYARLINGTONVA 22201

ISBN: (纸本)0819418404

Interferometric synthetic aperture radars (IFSARs) are powerful tools for topographic mapping. The systems' characteristics: wide swath coverage, automated processing, all- weather operation, and predicted accuracies, give them a unique set of capabilities. IFSAR has been demonstrated from aircraft and satellites, and high-resolution IFSARs achievable from aircraft offer more promise for feature mapping than the satellite systems. We discuss the unique processing steps that are required in the formation of IFSAR terrain data images. Recent work has been done on the automatic recognition of terrain features from IFSAR data. We describe the methods used and predict the variation in the applicability of these methods.

关键词： radar TOPOGRAPHY MAPPING synthetic aperture radar INTERFEROMETER TERRAIN CLASSIFICATION

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Morphology and Refocus of Fast-Moving Exo-clutter Targets in synthetic aperture radar imagery 31

Morphology and Refocus of Fast-Moving Exo-clutter Targets in...

引用

conference on algorithms for synthetic aperture radar imagery XXXI

作者： Carrell, David A. Naval Postgrad Sch Elect & Comp Engn Monterey CA 93943 USA

ISBN: (纸本)9781510673830;9781510673823

The signatures of moving targets with synthetic aperture radar (SAR) imagery are typically smeared primarily in the radar cross-range direction. For such endoclutter targets, the time interval between adjacent radar pulses along the synthetic aperture is sufficiently small that the collection of the target signature does not experience aliasing. If a mobile target is moving sufficiently fast during the SAR collection interval, then the signature exhibits a smearing that lies along a diagonal in the SAR image space of down-range versus cross-range. In the present analysis, the properties of such diagonal signatures are investigated for constant velocity targets. The research further includes the development of new and advanced mathematics and algorithms that yield finely refocused SAR imagery for automatic detection and recognition, even for relatively fast exoclutter targets with non-uniform rotation. This proposal develops and applies two algorithms to detect and refocus fast-moving exoclutter surface targets within SAR imagery: (1) Rapid xoclutter Eocus Transformation (REFT) algorithm to transform input SAR imagery into a form conducive for the detection of fast-moving exoclutter targets, and (2) Arbitrary Rigid Object Motion Autofocus (AROMA) algorithm for automatic focus of moving targets with non-uniform rotation and translation.

关键词： synthetic aperture radar radar imaging moving target imaging

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Long range moving target imaging 2

Long range moving target imaging

引用

conference on algorithms for synthetic aperture radar imagery ii

作者： GANTHIER, E HORMEL, EJ SCHEFFLER, AO SZAKOVITS, DJ NORTHROP GRUMMAN DEPT ADV SYSTSURVEILLANCE & BATTLE MANAGEMENT SYSTMELBOURNEFL 32940

ISBN: (纸本)0819418404

Images of suitable quality can be used for detection, classification, identification, and precision targeting. synthetic aperture radar (SAR) systems are capable of providing such images from standoff ranges. These systems, however, typically image stationary targets and have limited or no capability to image moving targets. Moving target imaging (MTIm) provides a means to focus movers in SAR imagery. Proof of concept was demonstrated by Grumman as early as 1991 using a long range, high resolution radar platform to image moving targets. The radar platform is a key factor in any imaging experiment. Various radar parameters such as range, PRF, resolution, and phase center separation must be analyzed to fully appreciate the advantages as well as the potential caveats associated with a given platform. The results of theoretical analysis and numerical simulations used to evaluate the effect of system parameters on imaging are described and studies regarding the challenges specific to long range MTIm are presented.

关键词： radar Doppler effect Signal processing synthetic aperture radar Antennas Composites Image resolution Image quality Imaging systems Image processing

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High resolution topomaps from SARs 2

High resolution topomaps from SARs

引用

conference on algorithms for synthetic aperture radar imagery ii

作者： PIEN, HH DESAI, H CHARLES STARK DRAPER LAB INC CAMBRIDGEMA 02139

ISBN: (纸本)0819418404

One approach to obtaining topographic information from SAR imagery is to utilize a multiple- image data collection scheme to collect stereo SAR images. The resulting topographic map, however, is generally of considerably lower resolution than the images themselves. This paper describes a new approach to the construction of topomaps that combines the lower resolution topomap with the SAR intensity images within a variational formulation. The result is a single formulation combining higher spatial resolution than were previously possible.

关键词： synthetic aperture radar Image segmentation Reflectivity Image resolution Image fusion 3D image processing Image processing Spatial resolution Data fusion 3D metrology

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Signature Predictions of Surface Targets Undergoing Braking Maneuvers in Squinted Spotlight synthetic aperture radar imagery 23

Signature Predictions of Surface Targets Undergoing Braking ...

引用

conference on algorithms for synthetic aperture radar imagery XXiiI

作者： Garren, David A. Naval Postgrad Sch Monterey CA 93943 USA

ISBN: (纸本)9781510600843

This paper investigates methodologies for predicting the smear signatures in squinted spotlight synthetic aperture radar (SAR) imagery collections due to surface targets that are undergoing braking maneuvers. Previous analysis considered the case of broadside collection geometries. Analytic computation of a power series expansion is used to compute a generic expression for the down-range and cross-range components of the predicted mover signature. In addition, recent analysis presents capabilities for predicting the full signature shape, including the smear width and interference effects. The current investigations focuses on the effects of squinted collection geometries upon braking targets signatures.

关键词： synthetic aperture radar moving targets radar signatures radar imagery

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A multiresolution generalized likelihood ratio detection approach to target screening in synthetic aperture radar data 2

A multiresolution generalized likelihood ratio detection app...

引用

conference on algorithms for synthetic aperture radar imagery ii

作者： SUBOTIC, NS COLLINS, LM REILEY, MF GORMAN, JD ENVIRONM RES INST MICHIGAN ANN ARBORMI 48113

ISBN: (纸本)0819418404

We present a detection concept for initial target screening based on features that are derived from a multiresolution decomposition of synthetic aperture radar (SAlt) data. The physical motivation of the multiresolution feature based approach is the exploitation of signature oscillations produced by the interference between prominant scatterers in cultural objects when resolution is varied. We develop a generalized likelihood ratio test detector (GLRT) which differentiates between first order autoregressive (AR) multiresolution processes attributed to different spatial areas. We then derive two special cases of this detector motivated by arguments regarding the clutter statistics. We show that these schemes significantly outperform a standard energy detector operating on the finest available SAR resolution only. © 1995 SPIE. All rights reserved.

关键词： synthetic aperture radar DETECTION MULTIRESOLUTION

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Algorithm for multipolarization radar images treaty 2

Algorithm for multipolarization radar images treaty

引用

conference on algorithms for synthetic aperture radar imagery ii

作者： LYCHAK, O BACHEVSKIJ, R NATL ACAD SCI UKRAINE INST PHYS MECHDEPT REMOTE SENSINGLVOV 290601UKRAINE

ISBN: (纸本)0819418404

This paper is dedicated to presentation of the Earth's surface polarized radar images treaty technique for the purposes of environmental subsurface survey. The principal idea is based on calculation of anisotropy of electrical constant effective value of terrestrial layer in accordance with radar polarization imaging data. Demands for radar wave length, image on-surface resolution, and sounding beam incident angles range are discussed. Presented techniques could be used for analysis of nondeep dislocated and overlapped by soil tectonic structures and their dynamic detection.

关键词： SAR IMAGES TREATY POLARIZATION ANISOTROPY

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