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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11-20 订阅

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Regularization based super resolution imaging using FFT:s

Regularization based super resolution imaging using FFT:s

引用

conference on algorithms for symthetic aperture radar imagery xii

作者： Jonsson, R Ericsson Microwave Syst AB S-43184 Molndal Sweden

ISBN: (纸本)0819457930

This paper address the problem of super resolution imaging, using regularized amplitude estimation. Using a Bayesian problem formulation the regularization is applied through a prior distribution of the amplitudes. We investigate both a "super Gaussian" and a Student-t prior distribution. We derive maximum a posteriori (MAP) estimators for the amplitudes, based on the "Space-Alternating Generalized Expectation-Maximization" (SAGE) method, that only uses FFT:s in each iteration. The behavior of the algorithms for different choices of regularization parameters are illustrated through simple one dimensional examples. and SAR imaging is illustrated through an example using MSTAR data.

关键词： radar imaging SAR super resolution regularization SAGE

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Suppression of radio frequency interference (RFI) for synchronous impulse reconstruction ultra-wideband radar

Suppression of radio frequency interference (RFI) for synchr...

引用

conference on algorithms for symthetic aperture radar imagery xii

作者： Nguyen, L Soumekh, M USA Res Lab AMSRL SERU Adelphi MD 20783 USA

ISBN: (纸本)0819457930

This paper is concerned with the issues associated with the suppression of radio frequency interference (RFI) for a synchronous impulse reconstruction (SIRE) ultra-wideband (UWB) synthetic aperture radar (SAR) that is currently being designed and built at the Army Research Laboratory. In this effort, we are developing the next version of the UWB radar that can employ inexpensive A/D converters to digitize wideband signals using the equivalent time sampling technique. In this presentation, we provide an analytical model for the signature of the RFI sources that are measured via an equivalent time sampling scheme. This formulation reveals spectral as well as temporal properties of the measured RFI signals that would aid a user in developing sniff (passive) data collection strategies for constructing adaptive digital signal processing methods for suppressing RFI sources.

关键词： synthetic aperture radar ultra-wideband radar UWB radio frequency interference RFI

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IFSAR processing for 3D target reconstruction

IFSAR processing for 3D target reconstruction

引用

conference on algorithms for symthetic aperture radar imagery xii

作者： Austin, CD Moses, RL Ohio State Univ Dept Elect & Comp Engn Columbus OH 43210 USA

ISBN: (纸本)0819457930

In this paper we investigate the use of interferometric synthetic aperture radar (IFSAR) processing for the 3D reconstruction of radar targets. A major source of reconstruction error is induced by multiple scattering responses in a resolution cell, giving rise to height errors. We present a model for multiple scattering centers and analyze the errors that result using traditional IFSAR height estimation. We present a simple geometric model that characterizes the height error and suggests tests for detecting or reducing this error. We consider the use of image magnitude difference as a test statistic to detect multiple scattering responses in a resolution cell, and we analyze the resulting height error reduction and hypothesis test performance using this statistic. Finally, we consider phase linearity test statistics when three or more IFSAR images are available. Examples using synthetic Chi patch backhoe imagery are presented.

关键词： synthetic aperture radar wide angle radar imaging interferometric SAR three-dimensional reconstruction

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Target surface finding using 3D SAR data

Target surface finding using 3D SAR data

引用

conference on algorithms for symthetic aperture radar imagery xii

作者： Ruiter, JR Burns, JW Subotic, NS Altarum Inst Ann Arbor MI 48105 USA

ISBN: (纸本)0819457930

Methods of generating more literal, easily interpretable imagery from 3-D SAR data are being studied to provide all weather, near-visual target identification and/or scene interpretation. One method of approaching this problem is to automatically generate shape-based geometric renderings from the SAR data. In this paper we describe the application of the Marching Tetrahedrons surface finding algorithm to 3-D SAR data. The Marching Tetrahedrons algorithm finds a surface through the 3-D data cube, which provides a recognizable representation of the target surface. This algorithm was applied to the public-release Chi-patch simulations of a backhoe, which provided densely sampled 3-D SAR data sets. The performance of the algorithm to noise and spatial resolution were explored. Surface renderings were readily recognizable over a range of spatial resolution, and maintained their fidelity even under relatively low Signal-to-Noise Ratio (SNR) conditions.

关键词： synthetic aperture radar image interpretation data visualization

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3-D SAR image formation from sparse aperture data using 3-D target grids

3-D SAR image formation from sparse aperture data using 3-D ...

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conference on algorithms for symthetic aperture radar imagery xii

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

ISBN: (纸本)0819457930

The performance of ATR systems can potentially be improved by using three-dimensional (3-D) SAR images instead of the traditional two-dimensional SAR images or one-dimensional range profiles. 3-D SAR image formation of targets from radar backscattered data collected on wide angle, sparse apertures has been identified by AFRL as fundamental to building an object detection and recognition capability. A set of data has been released as a challenge problem. This paper describes a technique based on the concept of 3-D target grids aimed at the formation of 3-D SAR images of targets from sparse aperture data. The 3-D target grids capture the 3-D spatial and angular scattering properties of the target and serve as matched filters for SAR formation. The results of 3-D SAR formation using the backhoe public release data are presented.

关键词： SAR sparse apertures radar imaging electromagnetic scattering

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Impact of SAR image quality on recognition

Impact of SAR image quality on recognition

引用

conference on algorithms for symthetic aperture radar imagery xii

作者： Carlson, DW Montagnino, LJ Frankot, RT Raytheon Co Tucson AZ USA

ISBN: (纸本)0819457930

Automatic target recognition (ATR) performance is a function of image quality and its representation in the signature model generation and used in the ATR training process. This paper reports ATR performance as a function of synthetic aperture radar (SAR) image quality parameters including clutter-to-noise ratio (CNR) and multiplicative noise ratio (MNR). Images with specified image quality values were produced by introducing controlled degradations to the MSTAR public release data. Two different families of ATR algorithms, the statistical model-based classifier of DeVore, et al., and optimal tradeoff synthetic discriminant function (OTSDF) are applied to those data. Target classification accuracy was measured as a function of CNR/MNR for both the training and test data, indicating sensitivity of performance to a priori knowledge of these particular image quality parameters. Confusion matrices are expanded to include target aspect bins, providing visibility into performance as a function of aspect angle.

关键词： image quality clutter-to-noise ratio (CNR) MSTAR conditional Gaussian distribution optimal tradeoff synthetic discriminant function (OTSDF) filters synthetic aperture radar (SAR) automatic target recognition (ATR)

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Comparative analysis of feature extraction (2D FFT & Wavelet) and classification (L_P metric distances, MLP NN, & HNeT) algorithms for SAR imagery

Comparative analysis of feature extraction (2D FFT & Wavelet...

引用

conference on algorithms for symthetic aperture radar imagery xii

作者： Sandirasegaram, N English, R Def R&D Canada Ottawa ON K1A 0Z4 Canada

ISBN: (纸本)0819457930

The performance of several combinations of feature extraction and target classification algorithms is analyzed for Synthetic aperture radar (SAR) imagery using the standard Moving and Stationary Target Acquisition and Recognition (MSTAR) evaluation method. For feature extraction, 2D Fast Fourier Transform (FFT) is used to extract Fourier coefficients (frequency information) while 2D wavelet decomposition is used to extract wavelet coefficients (time-frequency information), from which subsets of characteristic in-class "invariant" coefficients are developed. Confusion matrices and Receiver Operating Characteristic (ROC) curves are used to evaluate and compare combinations of these characteristic coefficients with several classification methods, including L-p metric distances, a Multi Layer Perceptron (MLP) Neural Network (NN) and AND Corporation's Holographic Neural Technology (HNeT) classifier. The evaluation method examines the trade-off between correct detection rate and false alarm rate for each combination of feature-classifier systems. It also measures correct classification, misclassification and rejection rates for a 90% detection rate. Our analysis demonstrates the importance of feature and classifier selection in accurately classifying new target images.

关键词： synthetic aperture radar (SAR) feature extraction classification FFT wavelet MLP HNeT neural network ROC confusion matrix

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Polarimetric backscattering behavior of ground clutter at X, Ka, and W-band

Polarimetric backscattering behavior of ground clutter at X,...

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conference on algorithms for symthetic aperture radar imagery xii

作者： Gatesman, AJ Goyette, TM Dickinson, JC Giles, RH Waldman, J Sizemore, J Chase, RM Nixon, WE Univ Massachusetts Lowell Submillimeter Wave Technol Lab Lowell MA 01854 USA

ISBN: (纸本)0819457930

The HH and VV-polarized backscattering behavior of homogeneous ground clutter has been investigated by measuring the radar cross section per unit area of rough surface terrain. The X, Ka, and W-band behavior was investigated by analyzing ISAR imagery of 1/16(th) scale terrain collected in compact radar ranges operating at 160 GHz, 520 GHz, and 1.56 THz. An array of scale model ground planes was fabricated with the appropriate roughness to model relatively smooth to rough soil terrain. In addition to studying terrain backscatter as a function of surface roughness, the dependence on soil moisture content was also characterized by tailoring the dielectric constant of the scale models. The radar cross section per unit illuminated area (sigma(0)) was calculated as a function of elevation angle between 15 degrees and 75 degrees. The results of this work have been used in the fabrication of scale model ground planes for collection of radar imagery from scaled threat targets situated in realistic environments. Backscattering data are presented and compared to clutter data found in the literature.

关键词： radar terrain clutter backscattering rough surfaces

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Mitigation of complex target Doppler aliasing artifacts in SAR imagery using stepped-frequency waveforms

Mitigation of complex target Doppler aliasing artifacts in S...

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conference on algorithms for symthetic aperture radar imagery xii

作者： Luminati, JE Hale, TB Havrilla, MJ USAF Inst Technol Dayton OH 45433 USA

ISBN: (纸本)0819457930

Traditional high resolution Synthetic aperture radar (SAR) systems operate by placing a narrow transmit beam on a given ground patch for an extended time period. An alternate method of achieving high resolution is to increase the beamwidth. This approach allows both high resolution and large coverage areas, but increases the Doppler spread of the clutter echoes and therefore the required Pulse Repetition Frequency (PRF). Unfortunately, the required PRF for avoiding Doppler aliasing can become impractical rather quickly. This paper begins by introducing a recently proposed technique for mitigating these Doppler aliasing artifacts using continuous transmission of Stepped-Frequency (SF) waveforms. By randomizing the subpulse frequency order on a waveform-to-waveform basis. matched filter processing has been shown to build a composite ambiguity function which places Doppler filter nulls on top of Doppler aliasing artifacts, effectively removing them from the imagery. Using Chi patch radar scattering data of a backhoe, this technique is demonstrated for the first time using a non-point scatterer target. The 2-D spatial frequency data is used to produce uncompressed target echoes of randomized SF waveforms. A Doppler mismatch is applied to simulate the return from an aliased target. By applying the appropriate filter to the SF echoes, the aliased target is eliminated, dropping the peak of the aliased energy by nearly 40 dB.

关键词： Synthetic aperture radar Stepped-Frequency waveforms Xpatch Doppler aliasing

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An iterative method for SAR moving target detection and geolocation for staring radar applications

An iterative method for SAR moving target detection and geol...

引用

conference on algorithms for symthetic aperture radar imagery xii

作者： Lewis, TL Gorham, L Mitra, AK Shaw, AK USAF Res Lab AFRL SNRR Wright Patterson AFB OH 45433 USA

ISBN: (纸本)0819457930

Our proposed research is to focus and geolocate moving targets in synthetic aperture radar imagery. The first step is to estimate the target cross-range velocity using sequential sub-apertures;this is done by forming low resolution images and estimating position as a function of sub-aperture, thus yielding an estimate of the cross-range velocity. This cross-range estimate is then used to bound the search range for a bank of focusing filters. Determining the proper velocity that yields the best focused target defines an equation for the target velocity, however both components of the targets velocity can not be determined from a single equation. Therefore, a second image with a slightly different heading is needed to yield a second focusing velocity, and then having a system of two equations and two unknowns a solution can be obtained. Once the target velocity is known the proper position can be determined from the range velocity. The results support the development of staring radars with much larger synthetic aperture integration times in comparison to existing radars. The overall flavor of this approach is to trade-off the development of potentially expensive phased-array technology for GMTI and DOA applications with the potential development of advanced processing methods that show potential for processing data over very large aperture integration intervals to obtain similar GMTI geolocation results as with current phased C array technology.

关键词： SAR moving target detection

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