time_window.c 3.19 KB
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/*-----------------------------------------------------------------------------------------
 * Copyright (C) 2013  For the list of authors, see file AUTHORS.
 *
 * This file is part of DENISE.
 * 
 * DENISE is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 2.0 of the License only.
 * 
 * DENISE is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with DENISE. See file COPYING and/or <http://www.gnu.org/licenses/gpl-2.0.html>.
-----------------------------------------------------------------------------------------*/

/*------------------------------------------------------------------------
 *   Apply time damping (after Brossier (2009))                                 
 *   last update 31/08/11, D.Koehn
 *   modified    02/02/12, S.Heider
 *  ----------------------------------------------------------------------*/
#include "fd.h"

void time_window(float **sectiondata, float *picked_times, int iter, int ntr_glob, int **recpos_loc, int ntr, int ns, int ishot){

/* declaration of variables */
extern float DT;
extern int REC1, REC2, MYID;
extern float GAMMA, TWLENGTH_PLUS, TWLENGTH_MINUS;
extern char PICKS_FILE[STRING_SIZE];
int READ_PICKED_TIMES;
char pickfile_char[STRING_SIZE];
float time, dump, dump1, taper, taper1;
float *pick_tmp;
int i, j, h;


FILE *fptime;

READ_PICKED_TIMES=1;

/*GAMMA = 3.0;

if(iter>10){GAMMA=2.0;}
if(iter>20){GAMMA=1.0;}
if(iter>30){GAMMA=0.3;}
if(iter>80){GAMMA=0.1;}
if(iter>40){GAMMA=0.066;}
if(iter>50){GAMMA=0.0;}*/

/*GAMMA		= 10000.0;
TWLENGTH_PLUS  	= 0.01;
TWLENGTH_MINUS 	= 0.01;*/


/* read picked first arrival times */
if(READ_PICKED_TIMES==1){

pick_tmp = vector(1,ntr_glob);

sprintf(pickfile_char,"%s_%i.dat",PICKS_FILE,ishot);

fptime=fopen(pickfile_char,"r");
if (fptime == NULL) {
err(" picks_?.dat could not be opened !");
}

  for(i=1;i<=ntr_glob;i++){
    fscanf(fptime,"%f",&dump);
    pick_tmp[i] = dump;
}

fclose(fptime);

/* distribute picks on CPUs */
h=1;
  for(i=1;i<=ntr;i++){

    picked_times[h] = pick_tmp[recpos_loc[3][i]];
/*printf("MYID IS: %i REC1 is= %i REC2 is %i\n",MYID, REC1, REC2);
printf("MYID= %i     pick_tmp[%i]= %f\n",MYID, i,pick_tmp[i]);*/


    h++;}

free_vector(pick_tmp,1,ntr_glob);
    
} /* end of if(READTIMES==1) */

/* calculate RMS */
for(i=1;i<=ntr;i++){
      for(j=2;j<=ns;j++){
      
         time = (float)(j * DT);
         
         dump = (time-picked_times[i]-TWLENGTH_PLUS);
         taper = exp(-GAMMA*dump*dump);
         
         dump1 = (time-picked_times[i]+TWLENGTH_MINUS); 
         taper1 = exp(-GAMMA*dump1*dump1);
	 
	 if(time>=picked_times[i]+TWLENGTH_PLUS){
         sectiondata[i][j] = sectiondata[i][j] * taper;}
         
         if(time<=picked_times[i]-TWLENGTH_MINUS){
         sectiondata[i][j] = sectiondata[i][j] * taper1;}
         
         sectiondata[i][j] = sectiondata[i][j];
         
      }     
}

} /* end of function time_window.c */