Results 51 to 60 of about 16,290 (166)
Analysis of Doppler frequency shift response mechanism based on OFDM system
MATEC Web of Conferences, 2018 OFDM system is widely used in mobile communication because of its high spectral efficiency and strong anti-multipath capability. However, in high dynamic scenarios, the Doppler shift between the transmitter and the receiver destroys the orthogonality ...
Li Ke +3 more
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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
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Filter Bank Multicarrier Waveform Used for Integrated SAR and Communication Systems
Leida xuebao, 2018 The integrated Synthetic Aperture Radar (SAR) and Communication system can improve the networking capabilities of SAR, realize the real-time transmission of detection data, and improve the overall performance of the system.
Zhu Kehong +3 more
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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
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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
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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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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
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Synthetic rotational Doppler shift on transmission lines and it’s microwave applications
Scientific ReportsRotational Doppler shift of a circularly polarized wave impinging normally on a rotating anisotropic surface, causes scattered waves with frequency shift equals twice the surface rotation frequency.
Zohreh Seyedrezaei +2 more
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Scientific ReportsPhotonic radars are increasingly being developed and offer a promising replacement for traditional RF radars. They feature higher precision, and smaller size compared to the current microwave radars. One important part of a moving target indicating (MTI)
Hossein Emami, Reza Hashemi
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Sub-part-per-trillion test of the Standard Model with atomic hydrogen. [PDF]
NatureMaisenbacher L +6 more
europepmc +1 more source