Results 281 to 290 of about 118,033 (340)

Prediction of Wind Turbine's Doppler Frequency Shifts

2020 New Trends in Signal Processing (NTSP), 2020
This article deals with the prediction of the dominant Doppler frequency shifts of the wind turbine blades. Spread-spectrum of the Doppler frequency shifts of wind turbine blades can mask the radar targets. Current filtering methods are designed to filter only the complete radar resolution cells in places where wind turbines are located. However, these
Karel Juryca, Jan Pidanic, Heru Suhartanto   +2 more
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Comparison of methods for turbulence Doppler frequency shift calculation in Doppler reflectometer

Plasma Science and Technology, 2023
Abstract The Doppler reflectometer (DR), a powerful diagnostic for the plasma perpendicular velocity (u ⊥) and turbulence measurement, has been widely used in various fusion devices. Many efforts have been put into extracting the Doppler shift from the DR signal. There are several commonly used methods for Doppler shift
Zhong, Xiaoming, Zou, Xiaolan, Zhou, Chu, Liu, Adi, Zhuang, Ge, Feng, Xi, Zhang, Jin, Ji, Jiaxu, Fan, Hongrui, Liu, Shen, Wang, Shifan, Gao, Liutian, Shi, Wenxiang, Lan, Tao, Li, Hong, Xie, Jinlin, Mao, Wenzhe, Liu, Zixi, Liu, Wandong   +18 more
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Photonic Radio Frequency Memory with Controlled Doppler Frequency Shift [PDF]

2019 International Topical Meeting on Microwave Photonics (MWP), 2019
A photonic Radio Frequency (RF) memory with coherent frequency shift and time gated amplifying recirculating delay line is proposed. It can simultaneously control Doppler frequency shift (DFS) and RF storage time. The coherent frequency shift is realized by the beat between the carrier with acoustic-optic modulator (AOM) frequency shift and sideband ...
Zhidan Ding, Haiwen Cai, Fei Yang, Mingjun Wang, Yongxiang Weng, Dongjin Wang   +5 more
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Parameter Estimation Based on Doppler Frequency Shifts

IEEE Transactions on Aerospace and Electronic Systems, 1987
An acoustic source generates an amplitude-modulated tone, with Doppler variations due to the relative motion between source andreceiver. A method is presented for real-time estimation of tone restfrequency and minimal distance between source and receiver, usingdigital signal processing techniques.
Joseph I. Statman, E. R. Rodemich
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CANCELLATION OF DOPPLER FREQUENCY SHIFT [PDF]

, 1963
Abstract : A circuit is described which is capable of canceling first-order Doppler frequency shifts. It has potentialities in the fields of communication, data transmission, and navigation systems for vehicles moving at high velocities. The circuit has the following features: (1) Received and transmitted frequencies at each of the stations involved ...
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Doppler frequency shift of sound apparatus

The Physics Teacher, 2011
A large 1-m diameter rotary table with a semicircular waveguide along its periphery is the basis of the Doppler frequency shift of sound apparatus. A “button” speaker is attached to the outer edge of the rotary table and a microphone pickup is positioned on the wall of the waveguide at its midpoint.
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Laser Doppler velocimeter with optical frequency shifting

Optics & Laser Technology, 1973
Abstract A bi-directional laser Doppler velocimeter utilizing optical frequency shifting has been developed. Optical frequency shifting is achieved by using a rotating radial grating. A high diffraction efficiency permits the system to be used in the fringe mode.
J. Oldengarm, A.H. van Krieken, H.J. Raterink   +2 more
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A novel method of tracking the target in Doppler frequency shift [PDF]

Proceedings of the 33rd Southeastern Symposium on System Theory (Cat. No.01EX460), 2002
The conventional CW (continuous wave) radar provides the velocity information of the moving targets by extracting the Doppler shift in frequencies and indicating them in display units. Tracking in range and tracking in Doppler are, by and large, incorporated in pulse radar operating as MTI (moving target indicator).
V. Rajaravivarma, K. Balasubramanian
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Doppler frequency shift in a refractive atmosphere

Journal of Aircraft, 1987
A general derivation is given for the Doppler-shifted received frequency due to source and receiver motion of uniform velocity in a steady-state, refractive medium with spatial gradients in velocity and temperature. The results from three cases of this generalized equation are especially important.
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