Results 71 to 80 of about 4,161,881 (190)
Channel characteristics analysis of train-to-train wireless communication
Journal of Measurement Science and Instrumentation, 2021 Train-to-train（T2 T） communication can provide protection for existing train-to-ground private network communication, and its channel characteristics directly affect the application of upper-layer communication technologies.
GAO Yunbo +5 more
doaj
Joint estimation of target time delay and Doppler frequency in passive radar system
Tongxin xuebao, 2015 A novel method of joint estimation of time delay and Doppler shift in passive radar system based on short-time fractional Fourier transform (STFRFT) was proposed.Firstly,the mathematical expression of the STFRFT time-frequency resolution was studied for ...
ANGPeng W +3 more
doaj +2 more sources
Acoustic sound source tracking for a moving object using precise Doppler-shift measurement [PDF]
, 2013 We propose a sound source tracking method for a moving object that precisely measures the Doppler-shifted frequency. In order to track a moving sound source by determining velocity and location, it is necessary to measure the precise frequency shift in ...
Nishie, Suminori, Akagi, Masato
core
On the Correlation Between the SAR Backscatter Modulation and Surface Waves Orbital Velocity
IEEE Journal of Selected Topics in Applied Earth Observations and Remote SensingA challenging effect in the retrieval of ocean surface currents from synthetic aperture radar (SAR) is the so-called wave-induced Doppler velocity. This effect arises from the correlation between the modulation of the normalized radar cross section (NRCS)
Anis Elyouncha, Roland Romeiser
doaj +1 more source
Gümüşhane Üniversitesi Fen Bilimleri Enstitüsü DergisiIn this article, the effects of maximum velocity, vibration frequency and vibration amplitude parameters of objects on Doppler frequency shift (DFS) in Laser Doppler Vibrometer (LDV) systems using lasers at 1064 nm and 1550 nm wavelengths have been examined.
Abdurrahman Günday +5 more
openaire +1 more source
天地一体化信息网络The rapid relative displacement between high-speed aircraft and low-Earth orbit (LEO) satellites causes Doppler frequency shifts, affecting signal synchronization, acquisition, and demodulation performance.
LI Yi, ZHOU Kangyan
doaj
Radar target micro-doppler signature classification [PDF]
, 2008 This thesis reports on research into the field of Micro-Doppler Signature (μ-DS) based radar Automatic Target Recognition (ATR) with additional contributions to general radar ATR methodology.
Smith, G.E.
core
Rotational Doppler Effect of Vector Beams
PhotonicsThe optical rotational Doppler effect occurs when vortex beams are scattered by rotating objects and demonstrate the Doppler frequency shifts in scattered beams, which are associated with the optical angular momentum of vortex beams and the relative ...
Hehe Li, Dong Xu, Xinzhong Li
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The rotational Doppler effect and the rotational frequency shift
, 2004 The rotational frequency shift (RFS) has been investigated. The existence of the RFS, previously proposed [Phys. Rev. Lett., 78, 2539 (1997)], has been explicitly demonstrated experimentally for the first time, for different quantum systems and frequency regimes.
openaire +1 more source
Investigation into the selection of viewing configurations for three-component planar Doppler velocimetry measurements. [PDF]
, 2007 A method for the calculation of three orthogonal velocity components in planar Doppler velocimetry (PDV) using four or more measured velocity components (to the three typically used) is presented.
Nobes, David S. +2 more
core +1 more source