Results 31 to 40 of about 353 (143)
International Journal of Antennas and Propagation, 2020 Synthetic aperture radar (SAR) was originally exploited to image stationary scenes. However, it is important to derive target information of velocity for many applications.
Chao Chen +5 more
doaj +1 more source
Results in Applied MathematicsThis 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 +3 more
doaj +1 more source
Identification of Sonar Detection Signal Based on Fractional Fourier Transform
Polish Maritime Research, 2018 Aiming at the source of underwater acoustic emission, in order to identify the enemy emission sonar source accurately. Using the digital watermarking technology and combining with the good time-frequency characteristics of fractional Fourier transform ...
Biao Wang +3 more
doaj +1 more source
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
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
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
Using lightweight denoising network to suppress multiple barrage jamming in range‐Doppler domain
IET Radar, Sonar &Navigation, Volume 18, Issue 11, Page 2308-2324, November 2024.To address the issue of single‐channel radar resisting multiple barrage jamming, this paper proposes a novel jamming suppression framework based on range‐Doppler domain denoising. It also proposes a deep denoising network with a lightweight multi‐resolution encoding and decoding structure.
Minghua Wu +5 more
wiley +1 more source
Results in Optics, 2021 In this paper, a novel scheme for multidepth three dimensional (3D) object authentication is presented based on partial fractional Fourier transform spectrum (FrFT) and phase retrieval technique.
Qu Wang, Deping Xiong, Liang Lei
doaj +1 more source
IET Radar, Sonar &Navigation, Volume 18, Issue 10, Page 1691-1709, October 2024.This paper proposes a three‐dimensional interferometric inverse synthetic aperture radar imaging algorithm for the ship targets based on the cubic phase signal (CPS) model. This method approximates the azimuth echo signal as a CPS and utilises the particle swarm optimisation algorithm to estimate the higher order phase coefficients.
Junting Yang, Yong Wang
wiley +1 more source