NDLI: Separation of overlapping linear frequency modulated (LFM) signals using the fractional fourier transform

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IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control - Front cover

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Introduction to the Special Issue on the Joint Meeting of 12th International Meeting on Ferroelectricity and 18th IEEE International Symposium on Applications of Ferroelectrics

Analysis of polarization behavior in relaxation of BaTiO₃-based ferroelectrics using wideband dielectric spectroscopy

Ferroelectric 180° a-a nanostripe and nanoneedle domains in thin BaTiO₃ films prepared with focused-ion beam

Improved photoluminescence and ferroelectric properties of (Bi_3.6Eu_0.4)Ti₃O₁₂ thin films via Li⁺ doping

Relaxor-PT single crystals: observations and developments

Magnetic field-induced strain and magnetoelectric effects in sandwich composite of ferromagnetic shape memory Ni-Mn-Ga crystal and piezoelectric PVDF polymer

Pyroelectric performances of rhombohedral 0.42Pb(In_1/2Nb_1/2)O₃-0.3Pb(Mg_1/3Nb_2/3)O₃-0.28PbTiO₃ single crystals

Interpretation of T_m and T^* in Relaxor Ferroelectric 0.93Pb(Zn_1/3Nb_2/3)O₃-0.07PbTiO₃

Lead-free piezoelectric ceramics and thin films

Structural, dielectric, and ferroelectric properties of the (1ߝx)PbTiO₃-xBiAlO₃ solid solution

Ultrafast crystallization kinetics in (Pb,La)(Zr_0.30Ti_0.70)O₃ thin films by pulsed excimer laser annealing

Study of the integrated growth of dielectric films on GaN semiconductor substrates

Dielectric properties of (Ba,Sr)TiO₃ thin films with varied microstructures prepared by the chemical solution deposition method for thin-film capacitors and ferroelectric varactors

High-performance PMNߝPT thick films

Micro-machined high-frequency (80 MHz) PZT thick film linear arrays

Comparison of BST film microwave tunable devices based on (100) and (111) MgO substrates

Multiferroic and magnetoelectric materialsߞnovel developments and perspectives

Defect control for polarization switching in BiFeO₃ single crystals

Novel room temperature multiferroics for random access memory elements

Intrinsic microwave dielectric loss of lanthanum aluminate

Dielectric properties of rutile structure (Zn_1/3B_2/3)_x(Ti_ySn_1ߝy)_1ߝxO₂ (B=Nb⁵⁺,Ta⁵⁺) at microwave frequencies

A control theory approach to clock steering techniques

4-D x 3-D ultrasound: real-time scan conversion, filtering, and display of displacement vectors with a motorized curvilinear transducer

Anechoic sphere phantoms for estimating 3-D resolution of very-high-frequency ultrasound scanners

Quantitative measurements of apoptotic cell properties using acoustic microscopy

Calibration of sound forces in acoustic traps

Minimum variance ultrasonic imaging applied to an in situ sparse guided wave array

Separation of overlapping linear frequency modulated (LFM) signals using the fractional fourier transform

Stator design of a new type of spherical piezoelectric motor

Cellular polypropylene polymer foam as air-coupled ultrasonic transducer materials

Usage of symmetry in the simulation of interdigital transducers

A rotary ultrasonic motor using bending vibration transducers

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Separation of overlapping linear frequency modulated (LFM) signals using the fractional fourier transform

Content Provider	IEEE Xplore Digital Library
Author	Cowell, D.M.J. Freear, S.
Copyright Year	1986
Abstract	Linear frequency modulated (LFM) excitation combined with pulse compression provides an increase in SNR at the receiver. LFM signals are of longer duration than pulsed signals of the same bandwidth; consequently, in many practical situations, maintaining temporal separation between echoes is not possible. Where analysis is performed on individual LFM signals, a separation technique is required. Time windowing is unable to separate signals overlapping in time. Frequency domain filtering is unable to separate signals with overlapping spectra. This paper describes a method to separate time-overlapping LFM signals through the application of the fractional Fourier transform (FrFT), a transform operating in both time and frequency domains. A short introduction to the FrFT and its operation and calculation are presented. The proposed signal separation method is illustrated by application to a simulated ultrasound signal, created by the summation of multiple time-overlapping LFM signals and the component signals recovered with ±0.6% spectral error. The results of an experimental investigation are presented in which the proposed separation method is applied to time-overlapping LFM signals created by the transmission of a LFM signal through a stainless steel plate and water-filled pipe.
File Size	1353977
File Format	PDF
ISSN	08853010
Volume Number	57
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Time frequency analysis Ultrasonic imaging Fourier transforms Optimized production technology Frequency modulation
Content Type	Text
Resource Type	Article
Subject	Acoustics and Ultrasonics Instrumentation Electrical and Electronic Engineering

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