本文章介绍了在MATLAB环境下实现分数阶傅里叶变换(FRFFT)的方法和技术。通过详细解释其原理与应用,为信号处理和光学领域提供了一个强大的工具。
% Time-Frequency Toolbox
% Version 1.0 January 1996
% Copyright (c) 1994-96 by CNRS (France) - RICE University (USA).
%% Signal Generation Files
sigmerge - Add two signals with given energy ratio in dB.
Choice of the Instantaneous Amplitude
amexpo1s - Generate one-sided exponential amplitude modulation.
amexpo2s - Generate bilateral exponential amplitude modulation.
amgauss - Generate gaussian amplitude modulation.
amrect - Generate rectangular amplitude modulation.
amtriang - Generate triangular amplitude modulation.
Choice of the Instantaneous Frequency
fmconst - Signal with constant frequency modulation.
fmhyp - Signal with hyperbolic frequency modulation.
fmlin - Signal with linear frequency modulation.
fmodany - Signal with arbitrary frequency modulation.
fmpar - Signal with parabolic frequency modulation.
fmpower - Signal with power-law frequency modulation.
fmsin - Signal with sinusoidal frequency modulation.
gdpower - Signal with a power-law group delay.
Choice of Particular Signals
altes - Altes signal in time domain.
anaask - Amplitude Shift Keyed (ASK) signal.
anabpsk - Binary Phase Shift Keyed (BPSK) signal.
anafsk - Frequency Shift Keyed (FSK) signal.
anapulse - Analytic projection of unit amplitude impulse signal.
anaqpsk - Quaternary Phase Shift Keyed (QPSK) signal.
anasing - Lipschitz singularity.
anastep - Analytic projection of unit step signal.
atoms - Linear combination of elementary Gaussian wave packets.
dopnoise - Generate complex Doppler random signal.
doppler - Generate complex Doppler signal.
klauder - Klauder wavelet in time domain.
mexhat - Mexican hat wavelet in time domain.
tftb_window - Window generation (previously window.m).
%% Addition of Noise
noisecg - Analytic complex gaussian noise.
noisecu - Analytic complex uniform noise.
%% Modification
scale - Scale signal using Mellin transform.
%% Processing Files
Time-Domain Processing
ifestar2 - Instantaneous frequency estimation using AR2 modelisation.
instfreq - Instantaneous frequency estimation.
loctime - Time localization characteristics.
Frequency-Domain Processing
fmt - Fast Mellin transform
ifmt - Inverse fast Mellin transform.
locfreq - Frequency localization characteristics.
sgrpdlay - Group delay estimation.
Linear Time-Frequency Processing
tfrgabor - Gabor representation.
tfrstft - Short time Fourier transform.
Bilinear Time-Frequency Processing in the Cohens Class
tfrbj - Born-Jordan distribution.
tfrbud - Butterworth distribution.
tfrcw - Choi-Williams distribution.
tfrgrd - Generalized rectangular distribution.
tfrmh - Margenau-Hill distribution.
tfrmhs - Margenau-Hill-Spectrogram distribution.
tfrmmce - MMCE combination of spectrograms.
tfrpage - Page distribution.
tfrpmh - Pseudo Margenau-Hill distribution.
tfrppage - Pseudo Page distribution.
tfrpwv - Pseudo Wigner-Ville distribution.
tfrri - Rihaczek distribution.
tfrridb - Reduced interference distribution (Bessel window).
tfrridh - Reduced interference distribution (Hanning window).
tfrridn - Reduced interference distribution (binomial window).
tfrridt - Reduced interference distribution (triangular window).
tfrsp - Spectrogram.
tfrspwv - Smoothed Pseudo Wigner-Ville distribution.
tfrwv - Wigner-Ville distribution.
tfrzam - Zhao-Atlas-Marks distribution.
Bilinear Time-Frequency Processing in the Affine Class
tfrbert - Unitary Bertrand distribution.
tfrdfla - D-Flandrin distribution.
tfrscalo - Scalogram, for Morlet or Mexican hat wavelet.
tfrspaw - Smoothed Pseudo Affine Wigner distributions.
tfrunter - Unterberger distribution, active or passive form.
Reassigned Time-Frequency Processing
tfrrgab - Reassigned Gabor spectrogram.
tfrrmsc - Reassigned Morlet Scalogram time-frequency distribution.
tfrrpmh - Reassigned Pseudo Margenau-Hill distribution.
tfrrppag - Reassigned Pseudo Page distribution.
tfrrpwv - Reassigned Pseudo Wigner-Ville distribution.
tfrrsp - Reassigned Spectrogram.
tfrrspwv - Reassigned Smoothed Pseudo WV distribution.
Ambiguity Functions
ambifunb - Narrow band ambiguity function.
ambifuwb - Wide band ambiguity function.
Post-Processing or Help to the Interpretation
friedman - Instantaneous frequency density.
holder - Estimate the Holder exponent through an affine