Results 1 to 10 of about 118,769 (293)

Generalized Doppler effect for high-accuracy frequency shift measurement [PDF]

Light: Science & Applications
Laser Doppler effect enables a wide range of precision measurements. However, its traditional implementations, including linear, rotational, and vectorial forms, have historically been treated as isolated phenomena, and meanwhile, their accuracy is ...
Yanxiang Zhang, Dexin Ba, Yang Yang, Yongkang Dong   +3 more
doaj   +2 more sources

Modeling of Doppler frequency shift in multipath radio channels [PDF]

Solar-Terrestrial Physics, 2016
We discuss the modeling of propagation of a quasi-monochromatic radio signal, represented by a coherent pulse sequence, in a non-stationary multipath radio channel.
Penzin M.S., Ilyin N.V.
doaj   +3 more sources

Minimally destructive, Doppler measurement of a quantized flow in a ring-shaped Bose–Einstein condensate

New Journal of Physics, 2016
The Doppler effect, the shift in the frequency of sound due to motion, is present in both classical gases and quantum superfluids. Here, we perform an in situ , minimally destructive measurement, of the persistent current in a ring-shaped, superfluid ...
A Kumar, N Anderson, W D Phillips, S Eckel, G K Campbell, S Stringari   +5 more
doaj   +2 more sources

Frequency-domain waveform approximants capturing Doppler shifts [PDF]

Physical Review D, 2018
Gravitational wave astrophysics has only just begun, and as current detectors are upgraded and new detectors are built, many new, albeit faint, features in the signals will become accessible.
Chamberlain, Katie, Gerosa, Davide, Moore, Christopher J., Yunes, Nicolas   +3 more
core   +7 more sources

Joint block estimation and attention-based long short-term memory network for doppler shift mitigation in UWA communication systems [PDF]

Scientific Reports
Aiming to address the performance degradation of OFDM systems caused by Doppler shift in underwater acoustic (UWA) communications, this paper proposes a two-step algorithm that combines the traditional block estimation method with an Attention-based Long
Qingxi Zeng, Tieliang Guo, Guojin Peng, Jun Huang   +3 more
doaj   +2 more sources

Simplified Doppler Frequency Shift Measurement Enabled by Serrodyne Optical Frequency Translation [PDF]

IEEE Microwave and Wireless Components Letters, 2022
9 pages, 6 figures, 1 ...
Yang Chen, Taixia Shi
openaire   +2 more sources

Investigation of Doppler Frequency Shift Effect on the Performance of Four-Channel Space Chaotic Laser Communication

IEEE Photonics Journal, 2023
In this article, the wavelength division multiplexing (WDM) technology is applied to the space chaotic laser communication system. We deduce the bit error rate (BER) model of multi-channel space chaotic laser communication with Doppler frequency shift ...
Mi Li, Xue Wang, Yisi Wang, You Guo, Jisun Chen, Yijun Jiang   +5 more
doaj   +1 more source

Velocity Measurement of Coherent Doppler Sonar Assisted by Frequency Shift, Kalman Filter and Linear Prediction

Journal of Marine Science and Engineering, 2021
Velocity is vital information for navigation and oceanic engineering. Coherent Doppler sonar is an accurate tool for velocity measurement, but its use is limited due to velocity ambiguity.
Peng Liu, Nobuyoshi Kouguchi, Ying Li
doaj   +1 more source

All-Optical Pulsed Signal Doppler Frequency Shift Measurement System

IEEE Photonics Journal, 2021
A simple and all-optical Doppler frequency shift (DFS) measurement system is presented. It is based on a dual-drive Mach Zehnder modulator (DDMZM) driven by a transmitted signal and an echo signal received by an antenna.
Chongjia Huang, Erwin H. W. Chan
doaj   +1 more source

Acquisition of Time and Doppler Shift in WFRFT Encrypted Chaotic Direct Sequence Spread Spectrum System

IEEE Access, 2022
Weighted fractional Fourier transform encrypted chaotic direct sequence spread spectrum (WFRFT-CD3S) signal is aperiodic and complex Gaussian distributed.
Jiangyan He, Guogang Yuan, Zili Chen, Xijun Gao   +3 more
doaj   +1 more source