239 lines
4.5 KiB
C
239 lines
4.5 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <math.h>
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#include <getopt.h>
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#include "rftime.h"
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#include "rfio.h"
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#define LIM 128
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#define NMAX 64
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void filter(struct spectrogram s,int site_id,float sigma,char *filename,int graves)
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{
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int i,j,k,l;
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float s1,s2,avg,std,dz;
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FILE *file;
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double f;
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int *mask;
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float *sig;
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mask=(int *) malloc(sizeof(int)*s.nchan);
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sig=(float *) malloc(sizeof(float)*s.nchan);
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// Open file
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file=fopen(filename,"a");
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// Loop over subints
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for (i=0;i<s.nsub;i++) {
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// Set mask
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for (j=0;j<s.nchan;j++)
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mask[j]=1;
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// Iterate to remove outliers
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for (k=0;k<10;k++) {
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// Find average
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for (j=0,s1=s2=0.0;j<s.nchan;j++) {
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if (mask[j]==1) {
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s1+=s.z[i+s.nsub*j];
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s2+=1.0;
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}
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}
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avg=s1/s2;
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// Find standard deviation
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for (j=0,s1=s2=0.0;j<s.nchan;j++) {
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if (mask[j]==1) {
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dz=s.z[i+s.nsub*j]-avg;
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s1+=dz*dz;
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s2+=1.0;
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}
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}
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std=sqrt(s1/s2);
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// Update mask
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for (j=0,l=0;j<s.nchan;j++) {
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if (fabs(s.z[i+s.nsub*j]-avg)>sigma*std) {
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mask[j]=0;
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l++;
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}
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}
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}
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// Reset mask
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for (j=0;j<s.nchan;j++) {
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sig[j]=(s.z[i+s.nsub*j]-avg)/std;
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if (sig[j]>sigma)
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mask[j]=1;
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else
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mask[j]=0;
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}
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// Find maximum when points are adjacent
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for (j=0;j<s.nchan-1;j++) {
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if (mask[j]==1 && mask[j+1]==1) {
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if (s.z[i+s.nsub*j]<s.z[i+s.nsub*(j+1)])
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mask[j]=0;
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}
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}
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for (j=s.nchan-2;j>=0;j--) {
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if (mask[j]==1 && mask[j-1]==1) {
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if (s.z[i+s.nsub*j]<s.z[i+s.nsub*(j-1)])
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mask[j]=0;
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}
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}
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// Mark points
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for (j=0;j<s.nchan;j++) {
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if (mask[j]==1) {
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f=s.freq-0.5*s.samp_rate+(double) j*s.samp_rate/(double) s.nchan;
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if (s.mjd[i]>1.0) {
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if (graves==0)
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fprintf(file,"%lf %lf %f %d\n",s.mjd[i],f,sig[j],site_id);
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else
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fprintf(file,"%lf %lf %f %d 9999\n",s.mjd[i],f,sig[j],site_id);
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}
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}
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}
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}
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fclose(file);
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free(mask);
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free(sig);
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return;
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}
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void usage(void)
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{
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printf("rffind: Find signals RF observations\n\n");
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printf("-p <path> Input path to file /a/b/c_??????.bin\n");
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printf("-s <start> Number of starting subintegration [0]\n");
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printf("-l <length> Number of subintegrations to plot [3600]\n");
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printf("-f <freq> Frequency to zoom into (Hz)\n");
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printf("-w <bw> Bandwidth to zoom into (Hz)\n");
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printf("-o <offset> Frequency offset to apply\n");
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printf("-C <site> Site ID\n");
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printf("-g GRAVES data\n");
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printf("-S Sigma limit [default: 5.0]\n");
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printf("-h This help\n");
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}
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int main(int argc,char *argv[])
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{
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int i,j,k,l,j0,j1,m=2,n;
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struct spectrogram s;
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char path[128];
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int isub=0,nsub=0;
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char *env;
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int site_id=0,graves=0;
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float avg,std;
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int arg=0;
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float sigma=5.0;
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FILE *file;
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double f,f0=0.0,df0=0.0;
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char filename[128]="find.dat";
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// Get site
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env=getenv("ST_COSPAR");
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if (env!=NULL) {
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site_id=atoi(env);
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} else {
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printf("ST_COSPAR environment variable not found.\n");
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}
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// Read arguments
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if (argc>1) {
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while ((arg=getopt(argc,argv,"p:f:w:s:l:hC:o:S:g"))!=-1) {
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switch (arg) {
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case 'p':
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strcpy(path,optarg);
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break;
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case 's':
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isub=atoi(optarg);
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break;
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case 'C':
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site_id=atoi(optarg);
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break;
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case 'l':
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nsub=atoi(optarg);
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break;
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case 'o':
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strcpy(filename,optarg);
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break;
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case 'f':
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f0=(double) atof(optarg);
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break;
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case 'g':
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graves=1;
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break;
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case 'S':
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sigma=atof(optarg);
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break;
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case 'w':
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df0=(double) atof(optarg);
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break;
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case 'h':
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usage();
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return 0;
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default:
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usage();
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return 0;
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}
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}
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} else {
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usage();
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return 0;
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}
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if (nsub==0) {
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// Read data
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for (i=isub;;i++) {
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s=read_spectrogram(path,i,nsub,f0,df0,1,0.0);
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// Exit on emtpy file
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if (s.nsub==0)
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break;
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printf("Read spectrogram\n%d channels, %d subints\nFrequency: %g MHz\nBandwidth: %g MHz\n",s.nchan,s.nsub,s.freq*1e-6,s.samp_rate*1e-6);
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// Filter
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filter(s,site_id,sigma,filename,graves);
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// Free
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free_spectrogram(s);
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}
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} else {
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// Read data
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s=read_spectrogram(path,isub,nsub,f0,df0,1,0.0);
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// Exit on emtpy file
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if (s.nsub>0) {
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printf("Read spectrogram\n%d channels, %d subints\nFrequency: %g MHz\nBandwidth: %g MHz\n",s.nchan,s.nsub,s.freq*1e-6,s.samp_rate*1e-6);
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// Filter
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filter(s,site_id,sigma,filename,graves);
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}
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// Free
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free_spectrogram(s);
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}
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return 0;
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}
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