Results 41 to 50 of about 5,323,059 (392)
Design and Processing Method for Doppler-Tolerant Stepped-Frequency Waveform Using Staggered PRF
Sensors, 2021 Stepped-frequency waveform may be used to synthesize a wideband signal with several narrow-band pulses and achieve a high-resolution range profile without increasing the instantaneous bandwidth.
Yan Zhang +4 more
doaj +1 more source
Algorithm for frequency capture and rectification in a low-orbit satellite IoT communication network
Mathematical Biosciences and Engineering, 2021 In satellite communication systems, due to relative motion between satellites and that between satellites and the ground, the resulting Doppler frequency offset adversely affects communication synchronization.
Jie Shen +3 more
doaj +1 more source
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
Radar detection and speed estimation of high‐speed targets using phase‐modulated waveforms
Electronics Letters, 2023 Specifying parameters of high‐speed targets as range and velocity in radar systems operating with phase‐modulated signals is a problematic process because of the serious effect of high Doppler frequency on these types of waveforms.
Alaa G. Zahra +3 more
doaj +1 more source
Observation of sub-Doppler absorption in the /Lambda-type three-level Doppler-broadened cesium system [PDF]
, 2003 Thanks to the atomic coherence in coupling laser driven atomic system, sub-Doppler absorption has been observed in Doppler-broadened cesium vapor cell via the /Lambda-type three-level scheme.
Liu, Tao +4 more
core +1 more source
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 +5 more
doaj +1 more source
Cable force measurement system design and experiment based on heterodyne laser Doppler vibrometer
Dianzi Jishu Yingyong, 2020 Cable force of bridge cable is an important standard to measure the safety of bridge. According to the working principle of laser Doppler vibration measurement, a small and high-precision laser Doppler vibration measurement system is designed and applied
Li Dongming +5 more
doaj +1 more source
New Satellite Automatic Tracking by Doppler [PDF]
فصلنامه علوم و فناوری فضایی, 2015 In this paper a new method for satellite authomatic tracking presented by earth station via doppler frequency . This method done by calculating time diviation through difference between real dopper frequency by communication equipment and software ...
M. Nasirian, S. ghaemi Sardroodi
doaj
Doppler-Induced Dynamics of Fields in Fabry-Perot Cavities with Suspended Mirrors [PDF]
, 2001 The Doppler effect in Fabry-Perot cavities with suspended mirrors is analyzed. Intrinsically small, the Doppler shift accumulates in the cavity and becomes comparable to or greater than the line-width of the cavity if its finesse is high or its length is
Abramovici +6 more
core +3 more sources
Sub-Doppler Frequency Metrology in HD for Tests of Fundamental Physics. [PDF]
Physical Review Letters, 2017 Weak transitions in the (2,0) overtone band of the hydrogen deuteride molecule at λ=1.38 μm were measured in saturated absorption using the technique of noise-immune cavity-enhanced optical heterodyne molecular spectroscopy.
F. Cozijn +4 more
semanticscholar +1 more source