Results 11 to 20 of about 112,664 (260)

Modeling of Monopulse Radar Signals Reflected from Ground Clutter in a Time Domain Considering Doppler Effects [PDF]

open access: yesJournal of Electromagnetic Engineering and Science, 2020
To evaluate the performance of a monopulse radar system, it is necessary to accurately model radar return signals from the ground surface in a time domain.
Jeong-Hun Nam   +4 more
doaj   +1 more source

Non-invasive Ultrasound Doppler Effect Based Method of Liquid Flow Velocity Estimation in Pipe [PDF]

open access: yesArchives of Acoustics, 2023
This paper discusses the estimation of flow velocity from a multi-sensor scenario. Different estimation methods were used, which allow the effective measurement of the actual Doppler shift in a noisy environment, such as water with air bubbles, and on ...
Pawel Biernacki   +2 more
doaj   +1 more source

The Evaluation of Light Conditions Influence and Corrections upon Doppler Blood Perfusion Imagining

open access: yesAdvances in Electrical and Electronic Engineering, 2016
The paper deals with theoretical and experimental research of the ambient light influence upon the measuring reliability of the perfusion maps by the laser Doppler method using the device PeriScan PIM 3.
Jan Kubicek   +4 more
doaj   +1 more source

ENERGY LOSS OF CHARGED PARTICLE ON THE WAVES EXCITATION IN SEMICONDUCTOR CYLINDER WITH TWO-DIMENSIONAL ELECTRON GAS ON THE SIDE SURFACE [PDF]

open access: yesРадиофизика и электроника, 2015
One of the urgent problems of modern radiophysics is the study of the fundamental properties of solid-state structures that contain nanodimension fragments.
A .V. Dormidontov   +2 more
doaj   +1 more source

USE OF DIFFERENT LIBRARIES IN THE ANALYSIS OF THE DOPPLER MEASUREMENTS OF THE SEFOR REACTOR: ASSESSMENT OF THE DOPPLER EFFECT OF THE ASTRID CORE [PDF]

open access: yesEPJ Web of Conferences, 2021
For the next generation of fast reactors, global objectives are required in terms of safety, sustainability, waste minimization and non-proliferation issues. Concerning safety issues, particular efforts have been made in order to obtain core designs that
Foissy M., Rimpault G., Buiron L.
doaj   +1 more source

Robust method for ship recognition based on ISAR imaging using 3D model

open access: yesThe Journal of Engineering, 2019
This study develops a robust method for ship target recognition, based on inverse synthetic aperture radar (ISAR) image matching with the template of 3D model.
Sudao D. Xie, M.Y. Pan, D.S. Li
doaj   +1 more source

Moving target detection based on velocity compensation methods in a coherent continuous wave lidar

open access: yesThe Journal of Engineering, 2019
Light Detection and Ranging (lidar) technology has been applied in military and civil areas and shows great potential. However, in coherent lidar detection, significant Doppler Effect and velocity uncertainty result a bad influence on moving target ...
Huixin Huang   +3 more
doaj   +1 more source

An influence of the covariance between single orbit parameters on the accuracy of observations of the pseudo-ranges and phase differences

open access: yesMetrology and Measurement Systems, 2020
The possibilities to improve values of the satellite orbit elements by employing the pseudo-ranges and differences of carrier phase frequencies measured at many reference GPS stations are analysed. An improvement of orbit ephemeris is achieved by solving
Skeivalas Jonas   +3 more
doaj   +1 more source

Optimal nonlinear filtering of MPSK signals in the presence of a Doppler frequency shift

open access: yesРоссийский технологический журнал, 2022
Objectives. Phase-shift keyed (PSK) signals are widely used in many telecommunication, communication, and cellular information transmission systems. Phase-shift keying provides a higher noise immunity than amplitude and frequency modulations do.
G. V. Kulikov, T. T. Do, R. R. Usmanov
doaj   +1 more source

Guidelines for ultrasound examination in ophthalmology. Part III: Color Doppler ultrasonography

open access: yesJournal of Ultrasonography, 2019
The aim of this article was to present the possibilities of use and application of color-coded Doppler ultrasonography in the diagnosis of various diseases of the eyeball and orbit which result from vascular disorders. Color-coded Doppler ultrasonography
Monika Modrzejewska
doaj   +1 more source

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