ricker.m

著名的seismiclab的代码 是地震学研究人员必备的工具

function [w] = ricker(f,dt)
%RICKER: Ricker wavelet of peak freq. f
%
%  [w] = ricker(f,dt);
%
%  IN   f : central freq. in Hz (f <<1/(2dt))
%       dt: sampling ineterval in sec  
%
%  OUT  w:  the ricker wavelet
%
%
%  Example: 
%           w = ricker(40,0.004); plot(w);
%             
%  SeismicLab
%  Version 1
%
%  written by M.D.Sacchi, last modified December 10,  1998.
%  [e-mail]
%
%  Copyright (C) 1998 Seismic Processing and Imaging Group
%                     Department of Physics
%                     The University of Alberta
%
%

nw=3./f/dt;
nw=2*floor(nw/2)+1;
nc=floor(nw/2);
i=1:nw;
alpha=(nc-i+1).*f*dt*pi;
beta=alpha.^2;
w=(1.-beta.*2).*exp(-beta);