Results 11 to 20 of about 17,083 (265)
Leida xuebao, 2019 Doppler center shift is an important parameter for Synthetic Aperture Radar(SAR) to retrieve ocean surface wind field and ocean surface current field. We present a calculation method of Doppler centroid shift for airborne side-looking SAR.
ZHAO Xianbin +4 more
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Remote Sensing, 2022 In addition to traditional linear Doppler shift, the angular Doppler shift in vortex electromagnetic wave (VEMW) radar systems carrying orbital angular momentum (OAM) can provide more accurate target identification micro-motion parameters, especially the
Lijun Bu +5 more
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A Novel Waveform Design Method for Shift-Frequency Jamming Confirmation
International Journal of Antennas and Propagation, 2018 Shift-frequency jamming is generally used to form range false targets for ground-based early-warning radar systems; the frequency shift value of such interference is larger than the Doppler shift value of the moving target, and the key element to ...
Chang Zhou, Zhen-Bo Zhu, Zi-Yue Tang
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Effect of Hematocrit upon the Shift in Doppler Frequency
Experimental Biology and Medicine, 1971 ConclusionOver a wide range of erythrocyte concentration (10-68 vol%) there is not an appreciable change in the Doppler frequency shift when blood flow conditions and temperature remain constant.
D D, Michie, C P, Cain
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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
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Normal Doppler Frequency Shift in Negative Refractive‐Index Systems [PDF]
Laser & Photonics Reviews, 2019 AbstractBesides the well‐known negative refraction, a negative refractive‐index material can exhibit another two hallmark features, which are the inverse Doppler effect and backward Cherenkov radiation. The former is known as the motion‐induced frequency shift that is contrary to the normal Doppler effect, and the latter refers to the Cherenkov ...
Xiao Lin, Baile Zhang
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Sensors, 2020 In an underwater acoustic cellular (UAC) system, underwater equipment or sensor nodes need to detect the identity of an underwater base station (UBS) and synchronise it with a serving UBS. It is known that, in an underwater acoustic channel, the temporal
Muhammad Asim +3 more
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IEEE Access, 2023 The performance of underwater acoustic communication is significantly affected by multipath propagation and Doppler spread. In this paper, we propose a new communication technique called overlapped chirp spread carrier (OCSC) by modifying the existing ...
Chang-Hyun Youn +3 more
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Research of Mobile Underwater Acoustic Communication of M-Ary Combining FDM and Piecewise-LFM
Xibei Gongye Daxue Xuebao, 2019 Aiming at the countering doppler shift, a mobile underwater acoustic communication scheme of M-ary via FDM-PLFM is proposed. The cross-correlation between piecewise linear frequency modulation(PLFM) and traditional LFM signal is analyzed based on the ...
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The Doppler effect induced by earthquakes: A case study of the Wenchuan MS8.0 earthquake
Geodesy and Geodynamics, 2022 Seismologists have found that the first arrival frequencies of P waves at different seismic stations have different widths, that is, different periods or frequencies, and they think that this phenomenon can be used to identify whether a Doppler effect is
Qicheng Li +3 more
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