Results 31 to 40 of about 101,062 (334)

A Multi-Rotor Drone Micro-Motion Parameter Estimation Method Based on CVMD and SVD

open access: yesRemote Sensing, 2022
It is of great significance to detect drones in airspace due to the substantial increase and regrettable misuse in the consumer market. In this paper, we establish a micro-motion theoretical model of a drone and analyze the micro-Doppler signature of ...
Degui Yang   +4 more
doaj   +1 more source

Scanning Inside Volcanoes with Synthetic Aperture Radar Echography Tomographic Doppler Imaging

open access: yesRemote Sensing, 2022
A problem with synthetic aperture radars (SARs) is that due to the poor penetrating action of electromagnetic waves within solid bodies, the ability to see through distributed targets is precluded.
Filippo Biondi
doaj   +1 more source

Micro-Motion Classification of Flying Bird and Rotor Drones via Data Augmentation and Modified Multi-Scale CNN

open access: yesRemote Sensing, 2022
Aiming at the difficult problem of the classification between flying bird and rotary-wing drone by radar, a micro-motion feature classification method is proposed in this paper.
Xiaolong Chen   +5 more
doaj   +1 more source

Attitude and Orbital Coupled Modeling and Micro-Doppler Characteristics Analysis of the Projectile with Initial Disturbances

open access: yesLeida xuebao, 2023
Radar echo modeling based on dynamics and kinematics serves as the theoretical basis for micro-Doppler characteristic analysis and projectile parameter extractions.
Zhihua GONG   +3 more
doaj   +1 more source

Spectral De-Aliasing Method of Micro-Motion Signals Based on a Complex-Valued U-Net Network

open access: yesRemote Sensing, 2023
Spectrum aliasing occurs in signal echoes when the sampling frequency does not comply with the Nyquist Sampling Theorem. In this scenario, the extraction of micro-motion parameters becomes challenging.
Ming Long   +5 more
doaj   +1 more source

Efficient Measurement System to Investigate Micro-Doppler Signature of Ballistic Missile [PDF]

open access: yes, 2016
Micro-Doppler (MD) shift caused by the micro-motion of a ballistic missile (BM) can be very useful to identify it. In this paper, the MD signatures of three scale-model BMs are investigated using a portable measurement system.
김경태   +4 more
core   +1 more source

The Method of Trajectory and Attitude Data Generation for Space Target

open access: yesXibei Gongye Daxue Xuebao, 2019
To solve the problem of space targets' trajectory and attitude data generation in system simulation, the characteristics of various types of ballistic missiles and their midcourse targets are analyzed deeply.

doaj   +1 more source

Structural phase transitions in multipole traps [PDF]

open access: yes, 2012
A small number of laser-cooled ions trapped in a linear radiofrequency multipole trap forms a hollow tube structure. We have studied, by means of molecular dynamics simulations, the structural transition from a double ring to a single ring of ions.
A. Calisti   +23 more
core   +3 more sources

Experimental observation of anomalous topological edge modes in a slowly-driven photonic lattice [PDF]

open access: yes, 2016
The discovery of the quantised Hall effect, and its subsequent topological explanation, demonstrated the important role topology can play in determining the properties of quantum systems. This realisation led to the development of topological band theory,
Andersson, Erika   +6 more
core   +2 more sources

Advancements in Research on Micro-motion Feature Extraction in the Terahertz Region

open access: yesLeida xuebao, 2018
With years of development and accumulation, a considerable amount of research has focused on micro-motion, an important auxiliary feature in radar target detection and recognition. With the recent rise of terahertz, micro-motion feature extraction in the
Yang Qi   +3 more
doaj   +1 more source

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