Results 21 to 30 of about 467 (179)

Fractional Fourier transform of Airyprime beams

Results in Physics
Analytical expressions of the electric field, the centriod, the beam half width, and the linear momentum of the fractional Fourier transform (FrFT) of an Airyprime beam are derived, respectively. The relation between the centriods or the beam half widths
Jian He, Jia-Hao Chen, Yong-Zhou Ni, Fei Wang, Yi-Min Zhou, Guo-Quan Zhou   +5 more
doaj   +1 more source

Continuous Time Frequency Domain Analysis of Ф-OTDＲ Nonstationary Signals

Journal of Harbin University of Science and Technology, 2021
Most of the natural vibration signals are stationary and modulated by the interference light signal of the distributed optical fiber vibration sensing system.
XU Tao, LI Li
doaj   +1 more source

Chirp Rate Estimation of LFM Signals Distorted by Underwater Acoustic Modal Dispersion

Electronics Letters, Volume 62, Issue 1, January/December 2026.
By combining the acoustic physical properties with signal processing methods, we have solved the problem of estimating the chirp rate of linear frequency‐modulated (LFM) signals under the condition of underwater acoustic modal dispersion. This method is implemented based on the fractional Fourier transform and de‐dispersion transform.
Li Jiati, Wang Bin, Huang Yiwang, Meng Yuting   +3 more
wiley   +1 more source

Joint 2‐D LFM Modulation and Mismatched Filter Design in Dual‐Function Radar‐Communication System

IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.
This paper proposes a joint 2‐D LFM modulation and mismatched filtering design for military‐grade dual‐function radar‐communication systems. The novel scheme modulates data onto both the initial frequency and chirp rate of LFM pulses, boosting data rates whilst preserving the constant‐envelope property critical for high‐power transmission.
Kehao Wang, Zixuan Zhang, Ke Zhang, Xiaobai Li, Wei Cheng, Tony Quek   +5 more
wiley   +1 more source

A comparative study on properties and uncertainty principles of fractional Fourier transform and offset fractional Fourier transform

Results in Applied Mathematics
This work deals with the offset fractional Fourier transform (OFrFT), which is a more general version of the fractional Fourier transform (FrFT). We demonstrate the basic properties such as translation, modulation and parity.
Mawardi Bahri, Airien Nabilla B.A., Nasrullah Bachtiar, Muhammad Zakir   +3 more
doaj   +1 more source

A Novel Radar Detection Method for Sensing Tiny and Maneuvering Insect Migrants

Remote Sensing, 2020
The use of radar to monitor insect migration is of great significance for pest control and biological migration mechanism research. However, migrating insects usually have small radar-cross-section (RCS) and are accompanied by maneuvering.
Rui Wang, Jiong Cai, Cheng Hu, Chao Zhou, Tianran Zhang   +4 more
doaj   +1 more source

Single‐Channel Multi‐Component Linear Frequency Modulation Signal Blind Separation Based on Multi‐Feature Enhanced Swin‐Transformer

IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.
To address the underdetermined blind source separation problem of single‐channel multi‐component linear frequency modulation (LFM) signals, the separation task is reformulated as a semantic segmentation problem on time‐frequency spectrograms. A multi‐feature enhanced Swin‐Transformer network, integrating an optimised convolutional block attention ...
Weifeng Sun, Xinyue Wang, Chao Zhang, Peng Zhang, Qi Liu   +4 more
wiley   +1 more source

Fractional Fourier Transform-Based Radio Frequency Interference Suppression for High-Frequency Surface Wave Radar

Remote Sensing, 2019
High-frequency surface wave radar (HF SWR) plays an important role in marine stereoscopic monitoring system. Nevertheless, the congestion of external radio frequency interference (RFI) in HF band degrades its performance seriously.
Qing Zhou, Hong Zheng, Xiongbin Wu, Xianchang Yue, Zhangyou Chen, Qinxiong Wang   +5 more
doaj   +1 more source

A New Method of Fault Localization for 500 kV Transmission Lines Based on FRFT-SVD and Curve Fitting

Energies, 2023
The paper presents the Fractional Fourier Transform-Singular Value Decomposition (FRFT-SVD) method for the localization of various power system faults in a 200 km long, 500 kV Egyptian transmission line using sent end-line current signals.
Mohamed H. Saad, Mostafa M. Fouda, Abdelrahman Said   +2 more
doaj   +1 more source

A Radar Target Feature Detection Method Based on Random Permutation of Fractional Fourier Transform Spectrum Matrix

IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.
Traditional coherent integration detection methods based on the fractional Fourier transform (FRFT) suffer from high redundancy and difficulty in controlling the false alarm probability during detection fusion; existing feature detection methods that utilise the maximum singular value of the FRFT spectrum matrix fail to consider the impact of spectral ...
Yong Huang, Yunhao Luan, Yunlong Dong, Jian Guan   +3 more
wiley   +1 more source