Results 1 to 10 of about 1,781,876 (250)

Low Computational Cost Distributed Acoustic Sensing Using Analog I/Q Demodulation

Sensors, 2019
Distributed acoustic sensing based on phase-sensitive optical time-domain reflectometry (Φ-OTDR) has been widely used in many fields. Phase demodulation of the Φ-OTDR signal is essential for undistorted acoustic measurement.
Fei Jiang, Zixiao Lu, Feida Cai, Honglang Li, Zhenhai Zhang, Yixin Zhang, Xuping Zhang   +6 more
doaj   +1 more source

Errors in the demodulation algorithm with a generated carrier phase introduced by the low-pass flter

Научно-технический вестник информационных технологий, механики и оптики
In this paper, we study the errors of the homodyne demodulation method based on arctangent function solutions (PGC-ATAN) which are associated with the use of a low-pass flter (LPF) in this signal phase demodulation algorithm.
G. P. Miroshnichenko, A. N. Arzhanenkova, M. Yu. Plotnikov   +2 more
doaj   +1 more source

The signal demodulation techniques [PDF]

, 2020
Condition monitoring of electrical machines is a broad scientific area, the ultimate purpose of which is to ensure the safe, reliable and continuous operation of electrical machines. Hence, the task of fault detection is still an art, because induction machines are widely used in variable speed drives and in renewable energy conversion systems.
Amirat, Yassine, Benbouzid, Mohamed
openaire   +2 more sources

Demodulation Method for Chirp-Rate Shift Keying of Mechanical Antenna Based on Fractional Fourier Transform

International Journal of Antennas and Propagation
The rotating-magnet–based mechanical antenna (RMBMA), as a current research hotspot in the field of extremely low-frequency transmission, has seen the introduction of chirp-rate shift keying (CSK), an inertia-compatible signal modulation method into its ...
Lei Xu, Qiang Zhou, Guowen Ding, Jianya Zhang, Xie He, Changfeng Liang   +5 more
doaj   +1 more source

An Adaptive Generalized Demodulation Method for Multimedia Spectrum Analysis is Applied in Rolling Bearing Fault Diagnosis

IEEE Access, 2020
Research into rolling bearing fault diagnosis methods is of great significance because rolling bearings are a key part of mechanical equipment. The effect of iterative generalized demodulation (IGD) on the demodulation of the fundamental frequency ...
Zengqiang Ma, Feiyu Lu, Suyan Liu, Xin Li   +3 more
doaj   +1 more source

Improved Low-Complexity Demodulation: Integrating Minimum-Mean-Square-Error and Maximum-Likelihood Detection for Image-Sensor-Based Visible Light Communication

IEEE Access
This study proposes an improved low-complexity signal demodulation method for a visible light communication (VLC) system with an image sensor as a receiver and light-emitting diode (LED) transmitters.
Yuki Ohira, Shintaro Arai, Kengo Fujii, Tomohiro Yendo   +3 more
doaj   +1 more source

Optical Microfiber All-Optical Phase Modulator for Fiber Optic Hydrophone

Nanomaterials, 2021
In order to meet the needs of phase generated carrier (PGC) demodulation technology for interferometric fiber optic hydrophones, we proposed an optical microfiber all-optical phase modulator (OMAOPM) based on the photo-induced thermal phase shift effect,
Minwei Li, Yang Yu, Yang Lu, Xiaoyang Hu, Yaorong Wang, Shangpeng Qin, Junyang Lu, Junbo Yang, Zhenrong Zhang   +8 more
doaj   +1 more source

2FSK Communication System Demodulation Algorithm for Novel Acoustically Excited SLF Antennas

水下无人系统学报
There exist some problems for acoustically excited super low frequency(SLF) antennas, such as low transmission power and low received signal-to-noise ratio. In addition, it is difficult to design a narrow-band filter in traditional binary frequency-shift
Xiayu ZHANG, Jiahao ZHANG, Jie JIAO, Yi LIU   +3 more
doaj   +1 more source

A novel clustering-based filter for impulsive noise reduction in electromagnetic tomography (EMT)

AIP Advances, 2020
Demodulation is a crucial step in signal processing for electromagnetic tomography (EMT) systems. Impulse noise appears in EMT, in particular, when excitation current is switched from one coil to another.
Ziqi Chen, Jorge R. Salas-Avila, Yang Tao, Wuliang Yin, Zhijie Zhang   +4 more
doaj   +1 more source

Multi-Scale Demodulation for Fault Diagnosis Based on a Weighted-EMD De-Noising Technique and Time–Frequency Envelope Analysis

Applied Sciences, 2020
Demodulation is one of the most useful techniques for the fault diagnosis of rotating machinery. The commonly used demodulation methods try to select one sensitive sub-band signal that contains the most fault-related components for further analysis ...
Wei-tao Du, Qiang Zeng, Yi-min Shao, Li-ming Wang, Xiao-xi Ding   +4 more
doaj   +1 more source