Physical scale modeling the millimeter-wave backscattering behavior of ground clutter

2001 ◽  
Author(s):  
Andrew J. Gatesman ◽  
Thomas M. Goyette ◽  
Jason C. Dickinson ◽  
Jerry Waldman ◽  
Jim Neilson ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Ground Clutter ◽  
Scale Modeling ◽  
Physical Scale

Physical Scale Modeling the Millimeter-Wave Backscattering Behavior of Ground Clutter

2001 ◽  
Author(s):  
A. J. Gatesman ◽  
T. M. Goyette ◽  
J. C. Dickinson ◽  
J. Waldman ◽  
J. Neilson ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Ground Clutter ◽  
Scale Modeling ◽  
Physical Scale

Physical Scale Modeling of VHF/UHF SAR Collection Geometries

2004 ◽  
Author(s):  
C. Beaudoin ◽  
A. Gatesman ◽  
M. Clinard ◽  
J. Waldman ◽  
R. Giles ◽  
...  
Keyword(s):  
Scale Modeling ◽  
Physical Scale

scholarly journals Small Foreign Object Debris Detection for Millimeter-Wave Radar Based on Power Spectrum Features

Sensors ◽  
2020 ◽  
Vol 20 (8) ◽  
pp. 2316
Author(s):  
Peishuang Ni ◽  
Chen Miao ◽  
Hui Tang ◽  
Mengjie Jiang ◽  
Wen Wu
Keyword(s):  
Power Spectrum ◽  
Millimeter Wave ◽  
Pso Algorithm ◽  
Classification Performance ◽  
Support Vector ◽  
Measured Signal ◽  
Foreign Object ◽  
Millimeter Wave Radar ◽  
Ground Clutter ◽  
Wave Radar

Foreign object debris (FOD) detection can be considered a kind of classification that distinguishes the measured signal as either containing FOD targets or only corresponding to ground clutter. In this paper, we propose a support vector domain description (SVDD) classifier with the particle swarm optimization (PSO) algorithm for FOD detection. The echo features of FOD and ground clutter received by the millimeter-wave radar are first extracted in the power spectrum domain as input eigenvectors of the classifier, followed with the parameters optimized by the PSO algorithm, and lastly, a PSO-SVDD classifier is established. However, since only ground clutter samples are utilized to train the SVDD classifier, overfitting inevitably occurs. Thus, a small number of samples with FOD are added in the training stage to further construct a PSO-NSVDD (NSVDD: SVDD with negative examples) classifier to achieve better classification performance. Experimental results based on measured data showed that the proposed methods could not only achieve a good detection performance but also significantly reduce the false alarm rate.

scholarly journals Development of a Corrosion Potential Measuring System Based on the Generalization of DACS Physical Scale Modeling

2015 ◽  
Vol 34 ◽  
pp. 06005
Author(s):  
Dalei Song ◽  
Xinjian Fan ◽  
Xueyan Ma ◽  
Weiguo Shi ◽  
Xiangdong Wang
Keyword(s):  
Corrosion Potential ◽  
Measuring System ◽  
Scale Modeling ◽  
Physical Scale

Depth sounding by means of a coincident coil frequency‐domain electromagnetic system

Geophysics ◽  
1997 ◽  
Vol 62 (1) ◽  
pp. 49-55 ◽  
Author(s):  
Kenneth Duckworth ◽  
Edward S. Krebes
Keyword(s):  
Frequency Domain ◽  
Half Space ◽  
Free Space ◽  
Thin Sheet ◽  
Electromagnetic System ◽  
Homogeneous Half Space ◽  
Scale Modeling ◽  
Physical Scale ◽  
Depth Sounding ◽  
Theoretical Developments

The concept of electromagnetic depth sounding by means of a coincident‐coil frequency‐domain electromagnetic system is developed in theory and demonstrated by means of physical scale modeling. The concept is based on the use of distance from the target as the sounding variable. The theoretical developments are confined to soundings conducted in free‐space with respect to either a homogeneous half‐space or a thin sheet conductor in conditions that approach the resistive limit. The use of distance from the target as the sounding variable becomes practical when the sounding system is a single compact unit of the type that a coincident coil concept inherently provides. In this method of sounding, the distance from the target is determined by taking the ratios of the fields measured at a variety of distances from the target conductor. This permits not only the distance to the target to be determined but also the direction to that target as may be of interest in soundings conducted in mines.

Main Principles of Vibrodamped Structure Scale Models for the Whole Sound Frequency Range

1995 ◽  
Author(s):  
Alexei V. Ionov
Keyword(s):  
Physical Modelling ◽  
Energy Difference ◽  
Full Scale ◽  
Sound Frequency ◽  
Frequency Range ◽  
Vibration Load ◽  
Scale Modeling ◽  
Physical Scale ◽  
Scale Models ◽  
Dynamic Rigidity

Abstract At low and middle sound frequencies the physical modelling of vibro-absorbing constructions is interpreted as a reconstruction of a frequency dependence of an imaginary part of a full-scale construction dynamic rigidity which is shifted in frequency according to a scale factor. For the high sound frequency range there is a dimensionless form of a matrix energy equation. It allows the task of physical scale modeling to be formulated as a reconstruction of a vibration energy difference between structure elements excited by an external vibration load and the others its elements as in a full-scale object. The analysis is fulfilled in the specially selected frequency bands when the geometrical similarity between scale and full-scale constructions and a number of demands to their material and the loss factors are observed.

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