Results 21 to 30 of about 191,656 (292)

Mechanical varying non-stationary signal separation method based on instantaneous frequency estimation

Advances in Mechanical Engineering, 2023
Mechanical equipment often works on variable speed condition, its corresponding vibration signal presents multi-component, modulation coupling with fast time-varying instantaneous frequency (IF), how to effectively compute IF and realize fasting varying ...
Lu Yan, Chen Qin-Xiao, Zhong Cheng, Tao Xian, Ding En-Jie, Liu Ke, Du Juan, Tong Xiao-Chun   +7 more
doaj   +1 more source

An Efficient Direction of Arrival Estimation Algorithm for Sources with Intersecting Signature in the Time–Frequency Domain

Applied Sciences, 2021
An efficient direction of arrival estimation method is proposed. The proposed algorithm accurately estimates the instantaneous frequency of signals received by multiple sensors (array of sensors/antennas).
Nabeel Ali Khan, Sadiq Ali, Kwonhue Choi
doaj   +1 more source

Instantaneous Frequency Estimation and Localization

, 2016
In many applications, a critical feature of a non-stationary signal is provided by its instantaneous frequency (IF), which accounts for the signal spectral variations as a function of time. This chapter presents methods and algorithms for the localization and estimation of the signal IF using time-frequency (t,f) based methods.
El-Jaroudi, A., Emresoy, M.K., Stanković, L.J., Hussain, Z.M., Boashash, B., O'Shea, P.J., Barkat, B., Sucic, V., Lerga, J., Rankine, L.J., Djurović, I., Simeunović, M., Djukanović, S., Ristic, B.   +13 more
openaire   +3 more sources

Parametermeasurement of aircraft-radiated noise from a single acoustic sensor node in three-dimensional space

Frontiers in Marine Science, 2022
A line spectrum presents the form of a narrow-band time-varying signal due to Doppler effect when the single hydrophone node observes flight-radiated noise.
Shuwen Yu, Lei Xiao, Weitao Sun
doaj   +1 more source

Direct Instantaneous Frequency Rate Estimation to Improve the Carrier Estimation Performance in Mars Entry, Descent, and Landing Flight

Remote Sensing, 2018
This paper focuses on the carrier estimation performance improvement in Mars entry, descent, and landing (EDL) flights. Carrier reconstruction could be used for trajectory derivation and Martian atmosphere profile inversion, and is the critical ...
Wanhong Hao, Xiaowei Cui, Jianguang Feng, Guangliang Dong, Zhiyong Zhu   +4 more
doaj   +1 more source

Research on a Signal Separation Method Based on Vold-Kalman Filter of Improved Adaptive Instantaneous Frequency Estimation

IEEE Access, 2020
The fault vibration signal of rotating machinery system under strong background noise has the characteristics of non-stationary, non-Gaussian and complex components.
Yanfeng Li, Zhennan Han, Zhijian Wang
doaj   +1 more source

RANSAC algorithm for instantaneous frequency estimation and reconstruction of frequency-modulated undersampled signals

EURASIP Journal on Advances in Signal Processing, 2021
Frequency modulated (FM) signals sampled below the Nyquist rate or with missing samples (nowadays part of wider compressive sensing (CS) framework) are considered.
Igor Djurović
doaj   +1 more source

Detection of LFM Radar Signals and Chirp Rate Estimation Based on Time-Frequency Rate Distribution

Sensors, 2021
Linear frequency-modulated (LFM) signals are the most significant example of waveform used in low probability of intercept (LPI) radars, synthetic aperture radars and modern communication systems.
Ewa Swiercz, Dariusz Janczak, Krzysztof Konopko   +2 more
doaj   +1 more source

Edge estimation method for non-uniform envelope pulse based on instantaneous frequency

The Journal of Engineering, 2019
Pulse edge estimation has always been an important issue in the field of electronic reconnaissance. Here, for the unknown received pulse with non-uniform envelope, a novel pulse edge estimation method based on instantaneous frequency is proposed.
Jingyun Sun, Jiacen Xu, Lixiang Ren
doaj   +1 more source

Method of estimation of frequency variation relying on estimation of shift of spectral peaks

Системный анализ и прикладная информатика, 2021
Problem of estimation of variated frequency of components of polyharmonic signals has been arose. Three-dimensional time-frequency representation of signals is usually used to resolve this problem.
D. A. Kechik, Yu. P. Aslamov, I. G. Davydov   +2 more
doaj   +1 more source