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Rev 646 Rev 647
Line 205... Line 205...
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    long int *correlationl, *correlationr;
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    long int *correlationl, *correlationr;
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    float *echo_map;
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    float *echo_map;
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    int *L_signal, *R_signal;
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    int *L_signal, *R_signal;
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    short *chirp, *signal;
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    short *chirp, *signal;
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    float *chirp_spect, *lecho_spect, *recho_spect;
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    float *chirp_spect, *lecho_spect, *recho_spect;
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    float x,y;
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    float a,b;
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    unsigned int i,j,m,n;
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    unsigned int i,j,m,n;
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    unsigned int delayl[10],delayr[10];	//store delay of signifed correlation
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    unsigned int delayl[10],delayr[10];	//store delay of signifed correlation
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    long int l,r;  // store correlation at strict time
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    long int l,r;  // store correlation at strict time
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    double df;	//frequency resolution
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    double df;	//frequency resolution
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    double k; // sample numbers to distance normalising constant
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    unsigned int frequency_bins; // number of output frequency bins
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    unsigned int frequency_bins; // number of output frequency bins
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    double *inchirp;
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    double *inchirp;
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    fftw_complex *outchirp;
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    fftw_complex *outchirp;
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    fftw_plan fft_plan_chirp;
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    fftw_plan fft_plan_chirp;
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    correlationr = malloc(period_size * sizeof(long int)); //array to store correlation curve
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    correlationr = malloc(period_size * sizeof(long int)); //array to store correlation curve
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    L_signal = malloc(period_size * sizeof(int));
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    L_signal = malloc(period_size * sizeof(int));
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    R_signal = malloc(period_size * sizeof(int));
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    R_signal = malloc(period_size * sizeof(int));
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    chirp = calloc(2*period_size, sizeof(short));
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    chirp = calloc(2*period_size, sizeof(short));
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    signal = malloc(2*period_size * sizeof(short));
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    signal = malloc(2*period_size * sizeof(short));
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    echo_map = malloc(3*period_size * sizeof(float));   // Array to store two dimensional image of echos
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    echo_map = malloc(3*period_size*period_size * sizeof(float));   // Array to store two dimensional image of echos
- 
 
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    if (echo_map == NULL) printf("Can't allocate enought memory");
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- 
 
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    k = SOUND_SPEED/rate;
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// generate ping pattern
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// generate ping pattern
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    chirp_size = linear_windowed_chirp(chirp);
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    chirp_size = linear_windowed_chirp(chirp);
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    frequency_bins = chirp_size / 2 + 1;
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    frequency_bins = chirp_size / 2 + 1;
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    df = (double) rate / (double) chirp_size;
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    df = (double) rate / (double) chirp_size;
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        correlationr[n]=abs(r);
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        correlationr[n]=abs(r);
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    }
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    }
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    m=0;
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    m=0;
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    printf("Building echo map\n");		// compute map from left and right correlation data
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    printf("Building echo map\n");		// compute map from left and right correlation data
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	for (i=0;i < period_size; i++)
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	for (i=0;i < period_size; i+=10)
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	{
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	{
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		a=k*i;
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		for(j=0;j < period_size; j++)
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		for(j=0;j < period_size; j+=10)
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		{
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		{
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			b=k*j;
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			echo_map[m]=(i*i-j*j+APERTURE*APERTURE)/(2*APERTURE);
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			echo_map[m]=(a*a-b*b+APERTURE*APERTURE)/(2*APERTURE);
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			echo_map[m+1]=sqrt(-(i-j-APERTURE)*(i+j-APERTURE)*(i-j+APERTURE)*(i+j+APERTURE))/(2*r);
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			echo_map[m+1]=sqrt((a-b-APERTURE)*(a+b-APERTURE)*(a-b+APERTURE)*(a+b+APERTURE))/(2*r);
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			echo_map[m+2]=correlationl[i]*correlationr[j];
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			echo_map[m+2]=correlationl[i]*correlationr[j];
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			m+=3;
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			m+=3;
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		}
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		}
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	}
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	}
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 - 
 
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 - 
 
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    printf("Searching echos\n");
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    printf("Searching echos\n");
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    r=0;
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    r=0;
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    l=0;
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    l=0;
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    for (n=0; n < period_size;n++) 			//najde nejvetsi korelace
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    for (n=0; n < period_size;n++) 			//najde nejvetsi korelace
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    {
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    {
Line 407... Line 410...
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    printf("Writing output files\n");
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    printf("Writing output files\n");
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    out=fopen("/tmp/sonar.txt","w");
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    out=fopen("/tmp/sonar.txt","w");
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    for (i=0; i <= (period_size - 1); i++)
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    for (i=0; i <= (period_size - 1); i++)
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    {
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    {
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        fprintf(out,"%2.3f %6d %6d %9ld %9ld\n",SOUND_SPEED * (float) i / rate,L_signal[i],R_signal[i],correlationl[i], correlationr[i]);
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        fprintf(out,"%2.3f %6d %6d %9ld %9ld\n", (float)i*k, L_signal[i], R_signal[i], correlationl[i], correlationr[i]);
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    }
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    }
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    fclose(out);
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    fclose(out);
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    j=0;
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    j=0;
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    out=fopen("/tmp/plane_cut.txt","w"); // writes plane cut - e.g. density map to file
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    out=fopen("/tmp/plane_cut.txt","w"); // writes plane cut - e.g. density map to file
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    for (i=0;i < period_size; i++)
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    for (i=0;i < period_size*period_size; i++)
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    {
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    {
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	fprintf(out,"%3.2f %3.2f %3.2f\n", echo_map[j], echo_map[j+1], echo_map[j+2]);
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	fprintf(out,"%3.3f %3.3f %3.3f\n", echo_map[j], echo_map[j+1], echo_map[j+2]);
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	j+=3;
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	j+=3;
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    }
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    }
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    fclose(out);
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    out=fopen("/tmp/chirp.txt","w");
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    out=fopen("/tmp/chirp.txt","w");
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    for (i=0; i <= (chirp_size - 1); i++)
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    for (i=0; i <= (chirp_size - 1); i++)
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    {
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    {
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        fprintf(out,"%6d %6d\n", i, chirp[i]);
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        fprintf(out,"%6d %6d\n", i, chirp[i]);