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vspectra.c
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vspectra.c
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#include <gtk/gtk.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/io.h>
#include <math.h>
#include <string.h>
#include <sched.h>
#include <fcntl.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <errno.h>
#include "d1cons.h"
#include "d1proto.h"
#include "d1typ.h"
#include "d1glob.h"
#include "rtl-sdr.h"
#define NSAM 0x100000
static rtlsdr_dev_t *dev = NULL;
void fft_init(int, float *, double *, int *);
void cfft(int, float *, double *, int *);
void vspectra(void)
{
int i, j, k, kk, num, numm, i4, maxi, r;
int m, mm, blsiz, blsiz2, nsam, n_read, info;
double avsig, av, max, min, noise, wid;
uint8_t *bufferRead = malloc((NSAM) * sizeof(uint8_t));
static double vspec[NSPEC];
static int wtt[NSPEC];
static float ream[NSPEC * 4];
static double re[NSPEC * 2], am[NSPEC * 2];
double smax;
double *comm;
blsiz = NSPEC * 2;
blsiz2 = blsiz / 2;
d1.bw = 2.4; // fixed 2.4 for TV dongle 10 MHz for ADC card
if (d1.fbw == 0.0)
d1.fbw = 2.0; // use bandwidth default if not set in srt.cat
d1.f1 = 0.5 - (d1.fbw / d1.bw) * 0.5;
d1.f2 = 0.5 + (d1.fbw / d1.bw) * 0.5;
d1.fc = (d1.f1 + d1.f2) * 0.5;
d1.lofreq = 0; // not used but needs to be set to zero to flag the use of the dongle
d1.efflofreq = d1.freq - d1.bw * 0.5;
info = 0;
comm = 0;
if (!d1.fftsim) {
comm = (double *) malloc((5 * blsiz + 100) * sizeof(double));
fft_init(blsiz2, ream, comm, &info);
}
num = d1.nblk; //was 20 // was 100
nsam = NSAM;
d1.nsam = NSAM * num;
avsig = 0;
numm = 0;
smax = 0;
max = -1e99;
min = 1e99;
for (i = 0; i < blsiz2; i++)
vspec[i] = 0.0;
for (k = 0; k < num; k++) {
if (!d1.radiosim)
// Read the raw data from the RTL Dongle
r = rtlsdr_read_sync(dev, bufferRead, nsam, &n_read);
else {
av = 5.0;
if (d1.elnow < 5.0)
av = av * (d1.tsys + d1.tcal) / d1.tsys;
if (strstr(soutrack, "Sun")) {
av = sqrt(d1.eloff * d1.eloff +
d1.azoff * d1.azoff * cos(d1.elnow * PI / 180.0) * cos(d1.elnow * PI / 180.0) +
1e-6);
if (av > d1.beamw)
av = d1.beamw;
av = 5.0 + 25.0 * cos(av * PI * 0.5 / d1.beamw) * cos(av * PI * 0.5 / d1.beamw);
}
for (i = 0; i < nsam; i++)
bufferRead[i] = (uint8_t) (sqrt(av) * gauss() + 127.397 + 0.5 + 0 * sin(2.0 * PI * 0.5 * (i / 2) / d1.bw)); // simulate data
}
// for(i=0;i<nsam;i+=0x10000) printf("%d %f\n",i,(double)(bufferRead[i]-127.397));
for (kk = 0; kk < nsam / blsiz; kk++) {
if (d1.fftsim)
for (i = 0; i < blsiz2; i++) {
re[i] = (double) (bufferRead[2 * i + kk * blsiz] - 127.397);
am[i] = (double) (bufferRead[2 * i + 1 + kk * blsiz] - 127.397);
if (re[i] > smax)
smax = re[i];
} else
for (i = 0; i < blsiz2; i++) {
ream[2 * i] = (float) (bufferRead[2 * i + kk * blsiz] - 127.397);
ream[2 * i + 1] = (float) (bufferRead[2 * i + 1 + kk * blsiz] - 127.397);
if (ream[2 * i] > smax)
smax = ream[2 * i];
}
if (d1.fftsim)
Four(re, am, blsiz2);
else {
cfft(blsiz2, ream, comm, &info);
for (i = 0; i < blsiz2; i++) {
re[i] = ream[2 * i];
am[i] = ream[2 * i + 1];
}
}
// for(i = 0; i < blsiz2; i++) if(re[i] > max) max=re[i];
// for(i = 0; i < blsiz2; i++) if(re[i] < min) min=re[i];
for (i = 0; i < blsiz2; i++) {
if (i < blsiz2 / 2)
j = i + blsiz2 / 2;
else
j = i - blsiz2 / 2;
vspec[j] += re[i] * re[i] + am[i] * am[i];
numm++;
}
}
}
if (d1.rms >= 0) {
d1.rms = 0;
for (i = 0; i < blsiz2; i++)
d1.rms += vspec[i];
if (d1.fftsim)
d1.rms = sqrt(d1.rms / ((double) (numm * 2.0 * blsiz2))); // 2 for re and am
else
d1.rms = sqrt(d1.rms / ((double) (numm * 2.0))); // amd cfft divides by blsiz2
}
// printf("max %f min %f\n",max,min);
max = av = 0;
maxi = 0;
for (i = 0; i < blsiz2; i++)
wtt[i] = 1;
if (numm > 0) {
if (d1.nfreq == blsiz2) {
for (i = 0; i < blsiz2; i++) {
if (i > 10)
spec[i] = vspec[i] / (double) numm;
else
spec[i] = 0;
}
} else {
m = blsiz2 / d1.nfreq;
for (i = 0; i < d1.nrfi; i++) {
i4 = (d1.rfi[i] - d1.freq + d1.bw * 0.5) * blsiz2 / d1.bw + 0.5; // index of rfi MHz
wid = 0.5 * d1.rfiwid[i] / (d1.bw / NSPEC);
for (j = -wid; j <= wid; j++)
if ((i4 + j) >= 0 && (i4 + j) < blsiz2)
wtt[i4 + j] = 0;
}
for (j = 0; j < d1.nfreq; j++) {
av = mm = 0;
for (i = j * m - m / 2; i <= j * m + m / 2; i++) {
if (i > 10 && i < blsiz2 && wtt[i]) { // wtt=0 removal of spurs
av += vspec[i] / (double) numm;
if (vspec[i] > max) {
max = vspec[i];
maxi = i;
}
mm++;
}
}
if (mm > 0)
spec[j] = av / mm;
else {
spec[j] = 0;
if (j > 10)
printf("check RFI settings in srt.cat data deleted at %8.3f\n",
j * d1.bw / d1.nfreq + d1.freq - d1.bw * 0.5);
}
}
max = max / (double) numm;
noise = spec[maxi / m] * sqrt(2.0 * blsiz2 / (double) d1.nsam);
if (max > spec[maxi / m] + d1.rfisigma * noise && d1.printout) // rfisigma sigma
printf("check for RFI at %8.4f MHz max %5.0e av %5.0e smax %5.0f %3.0f sigma\n",
maxi * d1.bw / blsiz2 + d1.freq - d1.bw * 0.5, max, spec[maxi / m], smax,
(max - spec[maxi / m]) / noise);
}
}
d1.smax = smax;
if (!d1.fftsim)
free(comm);
free(bufferRead);
}
// Initilizes and Opens the RTL Dongle
void Init_Device(int mode)
{
int r;
int i = 0;
int gain = 496; //496;//0;//125;//386;
/*
{ 0, 9, 14, 27, 37, 77, 87, 125, 144, 157,
166, 197, 207, 229, 254, 280, 297, 328,
338, 364, 372, 386, 402, 421, 434, 439,
445, 480, 496 };
*/
uint32_t dev_index = 0;
uint32_t frequency = (d1.freq + d1.freqcorr) * 1e6; //1433170000;//1420400000;//1409246000;//1407630000;//34000000;//1420400000;//1421550000;//99500000;//100000000;
uint32_t samp_rate = 2.4 * 1e6 + 0.5; //1400000;//2400000;//DEFAULT_SAMPLE_RATE;
int device_count;
char vendor[256], product[256], serial[256];
d1.dongle = 1;
if (mode) {
r = rtlsdr_set_center_freq(dev, frequency);
if (r < 0)
fprintf(stderr, "WARNING: Failed to set center freq.\n");
else if (d1.printout)
printf("Tuned to %u Hz.\n", frequency);
return;
}
device_count = rtlsdr_get_device_count();
if (!device_count) {
fprintf(stderr, "No supported devices found.\n");
exit(1);
}
if (d1.printout)
printf("Found %d device(s):\n", device_count);
for (i = 0; i < device_count; i++) {
rtlsdr_get_device_usb_strings(i, vendor, product, serial);
if (d1.printout)
printf(" %d: %s, %s, SN: %s\n", i, vendor, product, serial);
}
if (d1.printout)
printf("Using device %d: %s\n", dev_index, rtlsdr_get_device_name(dev_index));
r = rtlsdr_open(&dev, dev_index);
if (r < 0) {
fprintf(stderr, "Failed to open rtlsdr device #%d.\n", dev_index);
exit(1);
}
/* Set the sample rate */
r = rtlsdr_set_sample_rate(dev, samp_rate);
if (r < 0)
fprintf(stderr, "WARNING: Failed to set sample rate.\n");
/* Set the frequency */
r = rtlsdr_set_center_freq(dev, frequency);
if (r < 0)
fprintf(stderr, "WARNING: Failed to set center freq.\n");
else if (d1.printout)
printf("Tuned to %u Hz.\n", frequency);
if (0 == gain) {
/* Enable automatic gain */
r = rtlsdr_set_tuner_gain_mode(dev, 0);
if (r < 0)
fprintf(stderr, "WARNING: Failed to enable automatic gain.\n");
} else {
/* Enable manual gain */
r = rtlsdr_set_tuner_gain_mode(dev, 1);
if (r < 0)
fprintf(stderr, "WARNING: Failed to enable manual gain.\n");
/* Set the tuner gain */// doesn't set gain to gain value - uses R828_Arry[0] = (R828_Arry[0] & 0xF0) | 0x0F;//0x06;//gLNA;//lna_index
r = rtlsdr_set_tuner_gain(dev, gain);
if (r < 0)
fprintf(stderr, "WARNING: Failed to set tuner gain.\n");
}
r = rtlsdr_reset_buffer(dev);
// printf("Reset Status: %u \n", r);
}