Results 51 to 60 of about 3,627 (192)
Extraction of an Overlapped Second Harmonic Chirp Component using the Fractional Fourier Transform
, 2011 In ultrasound harmonic imaging with chirp coded excitation, the axial resolution can be improved by increasing the excitation signal bandwidth. However, increasing the bandwidth will cause overlapping between the received nonlinear second harmonic chirp ...
Arif, M +4 more
core +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
Chirp-wave Expansion of the Electron Wavefunctions in Atoms [PDF]
, 2013 The description of the electron wavefunctions in atoms is generalized to the fractional Fourier series. This method introduces a continuous and infinite number of chirp basis sets with linear variation of the frequency to expand the wavefunctions, in ...
Torres, Edmanuel, Torres, Rafael
core +2 more sources
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
Parameter Estimation of Chirp for Underwater Acoustic Channel
MATEC Web of Conferences, 2018 To overcome the performance degradation of conventional Chirp parameters estimation methods in underwater acoustic multipath channels, a novel parameters estimation method based on Fractional Fourier transform (FRFT) and Fourier transform (FFT) was ...
Junhui FAN, Hua PENG, Chi WEI
doaj +1 more source
Array, 2022 The present paper aims to develop and validate a robust and secure watermarking algorithm. Firstly, the algorithm transforms the cover image and the watermark image separately by FRFT to obtain the amplitudes of both the cover image and watermark image ...
Ming Tang, Fuken Zhou
doaj +1 more source
The fractional Fourier transform as a simulation tool for lens-based X-ray microscopy [PDF]
, 2018 The fractional Fourier transform (FrFT) is introduced as a tool for numerical simulations of X-ray wavefront propagation. By removing the strict sampling requirements encountered in typical Fourier optics, simulations using the FrFT can be carried out ...
Detlefs, Carsten +3 more
core +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
Sampling and Super-resolution of Sparse Signals Beyond the Fourier Domain
, 2018 Recovering a sparse signal from its low-pass projections in the Fourier domain is a problem of broad interest in science and engineering and is commonly referred to as super-resolution. In many cases, however, Fourier domain may not be the natural choice.
Bhandari, Ayush, Eldar, Yonina C.
core +1 more source
Shock and Vibration, Volume 2025, Issue 1, 2025.The strong background noise largely interferes with the feature extraction results of early faults of rolling bearings and the number of decomposed modes in the feature mode decomposition (FMD) algorithm depends on empirical selection. An overlapping group sparsity (OGS) method has an unsatisfactory performance in noise reduction.
Junhong Wang +6 more
wiley +1 more source