Results 241 to 250 of about 2,996,612 (302)

Effect of Sensor Motion on Time Delay and Doppler Shift Localization: Analysis and Solution

IEEE Transactions on Signal Processing, 2019
This paper investigates active localization of a stationary object using time delay alone or together with Doppler shift measurements observed by a number of dynamic monostatic sensors having collocated transmitters and receivers, where the sensor motion
Tianyi Jia, Dominic K. C. Ho, Haiyan Wang, Xiaohong Shen   +3 more
semanticscholar   +1 more source

Doppler Shift Distribution in Satellite Constellations

IEEE Communications Letters
Doppler shift has significant implications in Low Earth Orbit (LEO) constellations due to the rapid relative movement of satellites. This letter presents a novel approach based on stochastic geometry to capture the statistical distribution of Doppler ...
A. Al-Hourani, Bassel Al Homssi
semanticscholar   +1 more source

Initial Satellite Access Authentication Based on Doppler Frequency Shift

IEEE Wireless Communications Letters, 2021
The future mobile system shall be able to support satellite access to provide an ubiquitous wireless connection service. Satellite communication is vulnerable to spoofing attacks due to the open nature of wireless channels, especially for the downlink ...
Q. Fu, Yuehua Feng, Huiming Wang, Peng Liu   +3 more
semanticscholar   +1 more source

Predictive Communication and Its Application to Vehicular Environments: Doppler-Shift Compensation

IEEE Transactions on Vehicular Technology, 2018
We introduce predictive communication algorithms for channel estimation and equalization in vehicular environments. The proposed concept makes use of vehicular sensors combined with unique properties of surrounding environment to predict future changes ...
Roman Alieiev, T. Hehn, Andreas Kwoczek, T. Kürner   +3 more
semanticscholar   +1 more source

Relativistic Doppler-shift effects

Physical Review D, 1985
The lack of knowledge of relativistic distribution functions for interacting particles introduces uncertainty into the cosmological interpretation of Doppler shifts, particularly for systems such as quasars. Here we define an average Doppler shift, reducible to the nonrelativistic form in the appropriate limit.
openaire   +2 more sources

Einstein Shift and Doppler Shift

Nature, 1925
MAY I ask whether the Einstein shift of spectral lines is supposed to be due to some change of frequency associated with an atomic occurrence while generating waves, or to direct influence of the gravitational potential on ether vibrations after they are generated.
openaire   +1 more source

The Doppler shift lifetimes facility

Hyperfine Interactions, 2013
The Doppler Shift Lifetimes chamber is an experimental facility designed to measure the mean lifetimes of excited nuclear states that decay within femtoseconds via the detection of their Doppler-shifted γ ray transitions.
openaire   +1 more source

Doppler Phase-Shifting Digital Holography

Advances in Imaging, 2009
A novel reconstruction method utilizing optical Doppler effect for digital holography was proposed. Some images were obtained by a high speed camera to remove the zeroth-order and conjugate images and recorded object images were reconstructed.
Daisuke Barada, Yuichi Kikuchi, Toyohiko Yatagai   +2 more
openaire   +1 more source

Doppler shift of electron waves

Proceedings, annual meeting, Electron Microscopy Society of America, 1978
In an electron mirror interference microscope (1) two coherent partial waves are reflected by an electrostatic mirror (Fig.1). The mirror surface (“object”) is slowly tilted using a cylindrical piezo-ceramic spacer (€ = Δl/Δ U = 6 Å/V) one cm in length and one cm in diameter which produces a tilt angle of Δl/s = ɛ-Δu/s where s is the length of the ...
G. Möllenstedt, H. Lichte
openaire   +1 more source

Estimation of differential Doppler shifts

The Journal of the Acoustical Society of America, 1979
If the acoustic signal radiated by a moving source is observed at two or more locations, the received signals exhibit differential Doppler shifts which provide information about source motion. This paper calculates minimum mean-square errors for the estimates of differential Doppler shifts, which can be obtained in a given observation interval.
Schultheiss, Peter M., Weinstein, Ehud
openaire   +1 more source