Results 51 to 60 of about 752 (176)
Enhanced monopulse radar tracking using fractional Fourier filtering in the presence of interference [PDF]
, 2010 Monopulse radars are used to track a target that appears in the look direction beam width. Significant distortion is produced when manmade high power interference (jamming) is introduced to the radar processor through the radar antenna main lobe (main ...
Elgamel, Sherif A.E.H., Soraghan, J.J.
core
Frequency Domain Adaptive Filters in Vision Transformers for Small‐Scale Datasets
IET Computer Vision, Volume 19, Issue 1, January/December 2025.This paper introduces the Multi‐Head Adaptive Filter Frequency Vision Transformer (MAF‐FViT), a novel Vision Transformer model that replaces self‐attention with frequency‐domain adaptive filtering to improve computational efficiency and feature extraction.
Oscar Ondeng, Peter Akuon, Heywood Ouma
wiley +1 more source
Chirp-based multicarrier modulation [PDF]
, 2012 In this paper we demonstrate that in doubly-dispersive environments, a multicarrier (MC) system based on a fractional Fourier transform (FrFT) can achieve a better concentration of power near the main diagonal of the equivalent channel matrix compared to
Weiss, Stephan +2 more
core
The fractional Fourier transform and some applications [PDF]
, 2022 Primero, se introduce el cálculo fraccional con el objetivo de presentar los operadores derivada e integral y hablar de sus potencias fraccionales. Segundo, se hace la deducción del kernel de la transformada de Fourier fraccional (FRFT) utilizando las
Herrera Montoya, Miguel Alberto +1 more
core
Velocity estimation and compensation approach for SFW radar visa IGSS
Electronics Letters, Volume 61, Issue 1, January/December 2025.This paper introduces a pioneering velocity estimation technique utilizing the fractional Fourier transform (FrFT) to address these limitations. Leveraging the characteristic of the Doppler signal from a moving target, which manifests as a chirp signal with a rate proportional to the target's velocity, the FrFT is utilized for precise velocity ...
Bo Peng, Caixia Qiao, Qile Chen
wiley +1 more source
Efficient Coherent Integration Based on RDT‐SCFT‐KT for Manoeuvring Target With Doppler Ambiguity
IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.An efficient method based on RDT‐SCFT‐KT is proposed for effective coherent integration of an accelerated manoeuvring target with Doppler ambiguity. The proposed approach exhibits low computational complexity without requiring parameter searching process.
Zeyu Xu, Gongjian Zhou
wiley +1 more source
Journal of Physics: Conference SeriesAbstract Non-cooperative underwater acoustic pulse signal detection, which often lacks prior information, typically employs energy detection methods. However, in low signal-to-noise ratio (SNR) conditions, the efficiency of this method significantly decreases.
Lei Wei, Tao Fang, Biao Wang
openaire +1 more source
IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.To effectively suppress ISRJ, the paper proposes an ISRJ suppression algorithm combines grey entropy with multidimensional filtering. Compared with the same type of algorithms, the proposed algorithm demonstrates improved interference suppression performance under low signal‐to‐noise ratio (SNR) or high jamming‐to‐signal ratio (JSR) conditions ...
Jun Luo +5 more
wiley +1 more source
Adaptive fractional Fourier domain filtering [PDF]
, 2010 A novel adaptive filtering scheme based on fractional Fourier transform (FrFT) is introduced and characterized. As a generalization of the ordinary Fourier transform, FrFT is a powerful analysis tool to describe signals with chirp-type components.
Aldirmaz, S. +3 more
core +1 more source
Synchroextracting Transform Based on the Novel Short-Time Fractional Fourier Transform
Fractal and FractionalAs a generalization of the short-time Fourier transform (STFT), the novel short-time fractional Fourier transform (NSTFRFT) has been introduced recently.
Bei Li, Zhuosheng Zhang
doaj +1 more source