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calibrate.c
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calibrate.c
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// Copyright (c) <2012> <Leif Asbrink>
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without restriction,
// including without limitation the rights to use, copy, modify,
// merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
// OR OTHER DEALINGS IN THE SOFTWARE.
#include "globdef.h"
#include "uidef.h"
#include "fft1def.h"
#include "fft2def.h"
#include "screendef.h"
#include "caldef.h"
#include "thrdef.h"
#include "keyboard_def.h"
#if OSNUM == OSNUM_WINDOWS
#include "wscreen.h"
#endif
#if OSNUM == OSNUM_LINUX
#include "lscreen.h"
#endif
#define TOPLINE 0
#define WAITMENU_LINE TOPLINE+4
#define ERRLINE (WAITMENU_LINE+5)
#define MAX_PULSE_ERRORS 5
#define SKIP_BEFORE 0.15
#define SKIP_AFTER 0.30
void final_filtercorr_init(void)
{
int i, j, k, mm, line;
int ja, jb;
int ka, kb;
int siz_n, siz;
float t1, t2, t3, renorm;
double dt1, dt2;
double *dbuf;
double pwrinteg[17];
char s[80];
double dc[4];
if(cal_fft1_size == 0) {
show_missing_cal_info();
return;
}
mm=twice_rxchan;
// In case the native size of the calibration data is smaller
// than fft1_size, change fft1_size and remember old values in fft2_size.
fft2_size=fft1_size;
fft2_n=fft1_n;
if(cal_fft1_size < fft1_size) {
fft1_size=cal_fft1_size;
fft1_n=cal_fft1_n;
init_fft1_filtercorr();
}
init_fft(0,fft1_n, fft1_size, fft2_tab, fft2_permute);
// The correction function fft1_filtercorr is present in the same
// number of points as we currently have for fft1.
// Since the Q of the hardware is limited there is no need to use
// too many points in the filter function.
// This routine will reduce the number of points used for the filtercorr
// function while removing erronous points and reducing noise.
// ******************************************************************
// First get the magnitude of the second derivative into cal_buf.
// Large values over narrow frequency regions indicate the presence
// of discontinuities in the calibration function due to narrowband
// signals (spurs)
// Also store the amplitude and the second derivative of the phase
// in cal_buf2.
// We can expect large second derivatives at the passband ends.
// Set ka and kb to point to the interesting region.
ka=5;
kb=fft1_size-6;
while(fft1_desired[ka]<0.5)ka++;
while(fft1_desired[kb]<0.5)kb--;
for(j=0; j<mm; j+=2) {
// The calibration function consists of small numbers because
// it serves the purpose of giving a suitable output level
// from the first fft to interface to the integer format of
// MMX routines in case they might be used.
// Renormalize the calibration function to become near unity so we
// do not get underflows when computing powers.
t1=0;
for(i=ka; i<kb; i++) {
t2=(float)(fabs(fft1_filtercorr[mm*i+j ])+
fabs(fft1_filtercorr[mm*i+j+1]));
if(t2 > t1)t1=t2;
}
for(i=0; i<fft1_size; i++) {
fft1_filtercorr[mm*i+j ]/=t1;
fft1_filtercorr[mm*i+j+1]/=t1;
}
// First derivative into cal_tmp[0,1].
for(i=1; i<fft1_size; i++) {
cal_tmp[mm*(i-1)+j ]=fft1_filtercorr[mm*i+j ]-
fft1_filtercorr[mm*(i-1)+j ];
cal_tmp[mm*(i-1)+j+1]=fft1_filtercorr[mm*i+j+1]-
fft1_filtercorr[mm*(i-1)+j+1];
}
cal_tmp[mm*(fft1_size-1)+j ]=0;
cal_tmp[mm*(fft1_size-1)+j+1]=0;
// Amplitude into cal_buf2[0] and phase into cal_buf2[1]
for(i=0; i<fft1_size; i++) {
cal_buf2[mm*i+j ]=(float)sqrt(
fft1_filtercorr[mm*i+j ]*fft1_filtercorr[mm*i+j ]+
fft1_filtercorr[mm*i+j+1]*fft1_filtercorr[mm*i+j+1]);
if(cal_buf2[mm*i+j ] == 0) {
cal_buf2[mm*i+j+1]=0;
} else {
cal_buf2[mm*i+j+1]=(float)atan2(fft1_filtercorr[mm*i+j+1],
fft1_filtercorr[mm*i+j ]);
}
}
}
for(j=0; j<mm; j+=2) {
// Power of second derivative into cal_buf[0]
for(i=1; i<fft1_size; i++) {
t1=cal_tmp[mm*i+j ]-cal_tmp[mm*(i-1)+j ];
t2=cal_tmp[mm*i+j+1]-cal_tmp[mm*(i-1)+j+1];
cal_buf[mm*(i-1)+j]=t1*t1+t2*t2;
}
cal_buf[mm*(fft1_size-1)+j ]=0;
// A carrier is about 2 bins wide, but after differentiation twice
// we might expect it to be 4 bins wide. Remove HF noise in the
// second derivative power to make signals stand out better by
// low pass filtering over 5 points.
t1=0;
for(i=0; i<5; i++)t1+=cal_buf[mm*i+j];
for(i=5; i<fft1_size; i++) {
cal_buf[mm*(i-2)+j+1]=t1;
t1+=cal_buf[mm*i+j]-cal_buf[mm*(i-5)+j];
}
t3=0;
for(i=ka; i<kb; i++) {
t3+=cal_buf[mm*i+j+1];
}
dc[j]=t3/(float)(kb-ka+1);
}
// make a single channel for the summed relative power of both channels.
for(i=1; i<fft1_size; i++) {
t1=0;
for(j=0; j<mm; j+=2) {
t1+=cal_buf[mm*i+j+1]/(float)dc[j];
}
cal_buf[i]=t1;
}
ja=ka;
repl:
;
while(ja<kb && cal_buf[ja] < 100)ja++;
if(ja < kb) {
jb=ja;
while(jb<kb && cal_buf[jb] >20)jb++;
if(jb<kb) {
while(ja>ka && cal_buf[ja] > 20)ja--;
k=4+(jb-ja)/4;
while(ja>ka+k && cal_buf[ja]/cal_buf[ja-k]>4)ja--;
while(jb<kb-k && cal_buf[jb]/cal_buf[jb+k]>4)jb++;
// Make the amplitude constant across the bad region.
// The amplitude is set to the average amplitude from both sides.
for(j=0; j<mm; j+=2) {
t1=0;
for(i=0; i<k; i++) {
t1+=cal_buf2[mm*(ja-i)+j];
t1+=cal_buf2[mm*(jb+i)+j];
}
t1/=(float)(2*k);
for(i=ja; i<jb; i++) {
cal_buf2[mm*i+j]=t1;
t2+=cal_buf2[mm*i+j];
}
}
ja=jb;
goto repl;
}
}
// Restore the calibration function.
for(j=0; j<mm; j+=2) {
for(i=1; i<fft1_size; i++) {
t1=cal_buf2[mm*i+j]*(float)cos(cal_buf2[mm*i+j+1]);
t2=cal_buf2[mm*i+j]*(float)sin(cal_buf2[mm*i+j+1]);
fft1_filtercorr[mm*i+j ]=t1;
fft1_filtercorr[mm*i+j+1]=t2;
}
}
// Get the transform of the current filtercorr function.
begin_final:
;
cal_type=CAL_TYPE_REFINE_FILTERCORR;
cal_initscreen();
line=1;
dbuf=(double*)(cal_buf2);
k=mm*fft1_size;
t1=0;
for(i=0; i<k; i++)t1+=(float)fabs(fft1_filtercorr[i]);
renorm=(float)fft1_size/t1;
for(j=0; j<mm; j+=2) {
for(i=0; i<fft1_size; i++) {
cal_tmp[2*i ]=fft1_filtercorr[mm*i+j ]*renorm;
cal_tmp[2*i+1]=fft1_filtercorr[mm*i+j+1]*renorm;
}
fftforward(fft1_size, fft1_n, cal_tmp, fft2_tab, fft2_permute, FALSE);
for(i=0; i<fft1_size; i++) {
cal_buf[mm*i+j ]=cal_tmp[2*i ]/(float)fft1_size;
cal_buf[mm*i+j+1]=cal_tmp[2*i+1]/(float)fft1_size;
}
}
// We now have the pulse response of the hardware filter chain.
// The pulse is centered at point 0.
// Calculate the integrated power of the pulse summed over the channels.
dt1=0;
for(i=0; i<fft1_size; i++) {
for(j=0; j<mm; j++) {
dt1+=pow(cal_buf[mm*i+j],2.);
}
dbuf[i]=dt1;
}
dt2=0.5*(dbuf[fft1_size/2-8]+dbuf[fft1_size/2+8]);
// Add an integration constant for the integral to become zero
// in the center region, as far away as possible from the pulse.
for(i=0; i<fft1_size; i++) {
dbuf[i]-=dt2;
}
// Find out how fast the integral falls when the size is doubled.
i=2;
k=0;
lir_text(10,line,"Part of pulse energy lost outside range.");
line++;
dt1=dbuf[fft1_size-1]-dbuf[0];
while(i<=fft1_size/2) {
if(i == fft1_size/2) {
pwrinteg[k]=0;
} else {
pwrinteg[k]=fft1_size*(dbuf[fft1_size-i]-dbuf[i-1])/(dt1*(fft1_size-2*i));
}
sprintf(s,"Range=%d",2*i);
lir_text(12,line,s);
sprintf(s,"Lost=%.25f%%",pwrinteg[k]);
lir_text(25,line,s);
i*=2;
k++;
line++;
}
// Step siz_n until the remaining energy content of the integral
// is below 0.0001 (0.01% in power or 1% in voltage).
siz_n=1;
while(siz_n < k && pwrinteg[siz_n] > 0.0001)siz_n++;
if(siz_n == k)siz_n--;
if(k-siz_n < 3 && siz_n > 4) {
settextcolor(14);
lir_text(5,line,"The calibration function seems noisy.");
line++;
lir_text(5,line,"It could also need all the points.");
line++;
lir_text(5,line,"Make your own judgement!");
line++;
settextcolor(7);
}
line+=2;
siz_n+=2;
siz=1<<siz_n;
sprintf(s,"Suggested new size for calibration function %d (old = %d)",
siz,fft1_size);
lir_text(5,line,s);
line+=2;
save_msg:
;
sprintf(s,"Save modified calibration function in %d points? (Y/N,F1)",siz);
lir_text(5,line,s);
kbdinp:
;
await_processed_keyboard();
if(kill_all_flag) return;
if(lir_inkey == 'N') {
lir_text(5,line+3,"Enter size to save calibration. 0 to skip.");
siz=lir_get_integer(49,line+3,5,0,fft1_size);
if(siz == 0) return;
siz_n=make_power_of_two(&siz);
clear_lines(line,line+3);
goto save_msg;
}
if(lir_inkey == F1_KEY || lir_inkey == '!') {
help_message(310);
goto begin_final;
}
if(lir_inkey != 'Y') goto kbdinp;
if(siz_n < 4) {
lir_text(5,line+2,"Calibration data seems incorrect");
lir_text(5,line+3,"Nothing changed");
skip:
;
lir_text(5,line+5,press_any_key);
await_keyboard();
return;
}
if( siz_n >= fft1_n) {
lir_text(5,line+2,"Filter response needs current number of data points");
lir_text(5,line+3,"Data will be used without change");
goto skip;
}
resize_filtercorr_td_to_fd( FALSE, fft1_size, cal_buf, siz_n, siz, cal_buf);
write_filcorr(siz);
if(kill_all_flag) return;
sprintf(s,"Filter correction function saved in %d points",siz);
lir_text(5,line+2,s);
sprintf(s,"File size reduced from %d to %d bytes",
(1+twice_rxchan)*fft1_size*(int)sizeof(float)+20*(int)sizeof(int),
(1+twice_rxchan)*siz*(int)sizeof(float)+20*(int)sizeof(int));
lir_text(5,line+3,s);
lir_text(5,line+5,press_any_key);
await_keyboard();
// Restore filtercorr and fft1 desired.
if(fft2_size != fft1_size) {
fft1_size=fft2_size;
fft1_n=fft2_n;
init_fft1_filtercorr();
}
}
void cal_filtercorr(void)
{
int j,jj,totbytes;
char s[160];
int i,k,m,n,width,old_pb;
int ia,ib,ic,ja,jb,max_pulpos;
int ka, kb;
float collect_noiselevel[MAX_ADCHAN/2];
float collect_powerlevel[MAX_ADCHAN/2];
float collect_powermax[MAX_ADCHAN/2];
float old_trig_power,trig_power,dc[2*MAX_ADCHAN],ampmax;
float avg_power,summed_power;
float t1,t2,t3,r1,r2;
int pulse_error[MAX_PULSE_ERRORS];
int siz128, mm, collected_pulses;
int pulpos;
float summed_timediff;
int no_of_timediff;
int mask;
int show_flag;
double redraw_time;
double sum[4],isum[4];
double dsum1, dsum2;
double dt1,dt2,dt3;
fft2_size=(int)(2*cal_interval*(1-SKIP_BEFORE-SKIP_AFTER));
fft2_n=make_power_of_two(&fft2_size);
init_fft(0,fft2_n, fft2_size, fft2_tab, fft2_permute);
cal_ygain=1;
cal_xgain=1;
cal_xshift=0;
cal_domain=0;
mm=twice_rxchan;
for(j=0; j<mm; j++) {
sum[j]=0;
isum[j]=0;
}
siz128=fft2_size/128;
// **********************************************************************
// To get the pulses on one format independently of the hardware and
// fft implementation (some could contain filters) we use the standard
// routine for the first fft to get fourier transforms of the input data.
// By back transformation the input data is converted to floating point
// complex format regardless of the input format.
// **********************************************************************
i=0;
lir_sleep(10000);
fft1_px=fft1_pb;
while(i < 2 && thread_command_flag[THREAD_CAL_FILTERCORR]==THRFLAG_ACTIVE) {
while(fft1_pb==fft1_px) {
lir_await_event(EVENT_FFT1_READY);
}
fft1_px=fft1_pb;
i++;
}
clr_restart:
;
summed_power=0;
summed_timediff=0;
no_of_timediff=0;
for(i=0; i<mm*fft1_size-1; i++)cal_buf5[i]=0;
for(j=0; j<ui.rx_rf_channels; j++) {
collect_noiselevel[j]=0;
collect_powerlevel[j]=0;
}
totbytes=0;
collected_pulses=0;
old_trig_power=0;
for(i=0; i<MAX_PULSE_ERRORS; i++)pulse_error[i]=0;
redraw_time=current_time();
restart:
;
cal_type=CAL_TYPE_COLLECT_PULSE_AVERAGE;
cal_initscreen();
lir_text(0,WAITMENU_LINE,
"Wait until curves are stable. +,-,E,C => Change scale");
lir_text(0,WAITMENU_LINE+1,
"U => Compute new corrections in RAM. Do not save on disk.");
lir_text(0,WAITMENU_LINE+2,"S => Save to disk from RAM");
lir_text(0,WAITMENU_LINE+3,"T => Toggle time/frequency domain");
lir_text(0,WAITMENU_LINE+4,"A => Clear RAM");
lir_refresh_screen();
thread_status_flag[THREAD_CAL_FILTERCORR]=THRFLAG_ACTIVE;
show_flag=TRUE;
// Wait a full second. Some hardware may not settle fast...
lir_sleep(1000000);
old_pb=fft1_pb;
while(thread_command_flag[THREAD_CAL_FILTERCORR] == THRFLAG_ACTIVE) {
while(old_pb==fft1_pb) {
lir_await_event(EVENT_FFT1_READY);
if(thread_command_flag[THREAD_CAL_FILTERCORR] != THRFLAG_ACTIVE)
goto check_command_flag;
fft1_px=(fft1_pb-fft1_block+fft1_mask+1)&fft1_mask;
}
// Skip old data in case the cpu is a bit slow.
while( ((fft1_pb-fft1_px+fft1_mask+1)&fft1_mask) > fft1_block) {
fft1_px=(fft1_px+fft1_block)&fft1_mask;
}
old_pb=fft1_pb;
for(j=0; j<mm; j+=2) {
for(i=0; i<fft1_size; i++) {
if(fft1_px+mm*i+j > fft1_mask) {
lirerr(879456);
goto filcorr_error_exit;
}
cal_tmp[2*i ]=fft1_float[fft1_px+mm*i+j ];
cal_tmp[2*i+1]=fft1_float[fft1_px+mm*i+j+1];
}
if( (ui.rx_input_mode&IQ_DATA) != 0)fft_iqshift(fft1_size, cal_tmp);
fftback(fft1_size, fft1_n, cal_tmp, cal_table, cal_permute,FALSE);
for(i=0; i<fft1_size; i++) {
cal_buf[mm*i+j ]=cal_tmp[2*i ];
cal_buf[mm*i+j+1]=cal_tmp[2*i+1];
}
}
// The time function we got in cal_buf is the time function after
// multiplication with the sin pow4 window.
// Correct the time function by a division by cal_win - but use only the
// center half so we avoid division by small numbers.
for(j=0; j<mm; j+=2) {
t1=0;
t2=0;
for(i=fft1_size/4; i<=fft1_size/2; i++) {
cal_buf[i*mm+j ]/=cal_win[i];
t1+=cal_buf[i*mm+j ];
cal_buf[i*mm+j+1]/=cal_win[i];
t2+=cal_buf[i*mm+j+1];
}
for(i=fft1_size/2+1; i<=3*fft1_size/4; i++) {
cal_buf[i*mm+j ]/=cal_win[fft1_size-1-i];
t1+=cal_buf[i*mm+j ];
cal_buf[i*mm+j+1]/=cal_win[fft1_size-1-i];
t2+=cal_buf[i*mm+j+1];
}
// Remove any DC component to make pulses more visible.
t1/=(float)fft1_size/2+1;
t2/=(float)fft1_size/2+1;
for(i=fft1_size/4; i<=3*fft1_size/4; i++) {
cal_buf[i*mm+j ]-=t1;
cal_buf[i*mm+j+1]-=t2;
}
}
// Get the total power summed over all channels and store in cal_buf7
ampmax=0;
for(i=fft1_size/4; i<=3*fft1_size/4; i++) {
cal_buf7[i]=(float)pow(cal_buf[i*mm ],2.0);
for(j=1; j<mm; j++) {
cal_buf7[i]+=(float)pow(cal_buf[i*mm+j],2.0);
}
if(ampmax < cal_buf7[i])ampmax=cal_buf7[i];
}
if(old_trig_power == 0) {
old_trig_power=ampmax;
} else {
old_trig_power=(old_trig_power*(INIT_PULSENUM-1)+ampmax)/INIT_PULSENUM;
}
// Make sure we have a reasonable value for trig power by not
// going further until we looked at a few pulses.
totbytes+=fft1_size/2;
if(totbytes > INIT_PULSENUM*cal_interval) {
totbytes=(int)(INIT_PULSENUM*cal_interval);
// Set trig power at -15dB (30 times)
// Pulses must be separated well enough for the power level to
// have dropped well below -15dB after 70% of the interval time.
trig_power=old_trig_power/30;
// Look for a pulse, at least interval/2 points into our data.
pulpos=(int)(cal_interval+(float)fft1_size/4);
max_pulpos=(int)((float)(3*fft1_size)/4-cal_interval);
while( cal_buf7[pulpos] > trig_power/4 && pulpos<max_pulpos)pulpos++;
if(pulpos >= max_pulpos) {
lir_text(1,TOPLINE+1,"Noise level too high");
lir_refresh_screen();
} else {
sprintf(s,"Search range %d to %d",pulpos,max_pulpos);
lir_text(1,TOPLINE+1,s);
lir_refresh_screen();
while( cal_buf7[pulpos] < trig_power && pulpos<max_pulpos)pulpos++;
find_pulse:
;
if(ui.rx_rf_channels == 2) {
sprintf(s,"Time difference between channels %7.4f samples.",
summed_timediff/no_of_timediff);
lir_text(38,TOPLINE+1,s);
}
lir_sched_yield();
if(thread_command_flag[THREAD_CAL_FILTERCORR]!=THRFLAG_ACTIVE) {
goto check_command_flag;
}
if(pulpos >= max_pulpos)goto go_get_data;
dt1=current_time();
if(dt1 - redraw_time > 0.1) {
redraw_time=dt1;
show_flag=TRUE;
sprintf(s,
"Accepted %4d Wide %4d Weak %4d S/N %4d Spur %4d Gain y=%.2f x=%.2f xpos %d",
pulse_error[0],pulse_error[1],pulse_error[2],
pulse_error[3],pulse_error[4],cal_ygain,1/cal_xgain,cal_xshift);
lir_text(0,TOPLINE+2,s);
lir_refresh_screen();
}
ia=pulpos-(int)(cal_interval/2);
ib=pulpos+(int)(cal_interval/2);
if(ib < max_pulpos) {
ampmax=0;
for(i=ia; i<=ib; i++) {
if(cal_buf7[i] > 1.1*ampmax) {
ampmax=cal_buf7[i];
pulpos=i;
}
}
// Copy data into cal_buf2 so the pulse becomes placed at location 0
// Also copy the power function to cal_fft1_sumsq with the pulse at location 0
k=pulpos;
for(i=0; i<fft2_size/2; i++) {
for(j=0; j<mm; j++) {
cal_buf2[i*mm+j]=cal_buf[k*mm+j];
}
cal_fft1_sumsq[i]=cal_buf7[k];
k++;
}
k=pulpos-1;
for(i=fft1_size-1; i >= fft1_size-fft2_size/2; i--) {
for(j=0; j<mm; j++)cal_buf2[i*mm+j]=cal_buf[k*mm+j];
cal_fft1_sumsq[i]=cal_buf7[k];
k--;
}
// Find the width of the current pulse.
// First find the maximum power.
k=pulpos;
pulpos+=(int)cal_interval;
if( ampmax < old_trig_power/20) {
pulse_error[2]++;
goto find_pulse;
}
// Now step from the peak position until we reach power/8
ampmax/=8;
ja=0;
jb=fft1_size-1;
while( cal_fft1_sumsq[ja] > ampmax && ja<fft1_size)ja++;
while( cal_fft1_sumsq[jb] > ampmax && jb>ja)jb--;
width=ja+fft1_size-jb;
if(width > cal_interval/4) {
pulse_error[1]++;
goto find_pulse;
}
// Some soundcards like Maya44 have a time shift between the channels.
// compute the center of gravity of the pulse power in the two channels
// and accumulate the difference. We will use it to shift the pulse
// positions by changing the first derivative of the phase.
if(ui.rx_rf_channels == 2) {
t1=0;
t2=0;
r1=0;
r2=0;
for(i=-width; i<width; i++) {
t1+=cal_buf[(k+i)*mm ]*cal_buf[(k+i)*mm ]+
cal_buf[(k+i)*mm+1]*cal_buf[(k+i)*mm+1];
t2+=i*(cal_buf[(k+i)*mm ]*cal_buf[(k+i)*mm ]+
cal_buf[(k+i)*mm+1]*cal_buf[(k+i)*mm+1]);
r1+=cal_buf[(k+i)*mm+2]*cal_buf[(k+i)*mm+2]+
cal_buf[(k+i)*mm+3]*cal_buf[(k+i)*mm+3];
r2+=i*(cal_buf[(k+i)*mm+2]*cal_buf[(k+i)*mm+2]+
cal_buf[(k+i)*mm+3]*cal_buf[(k+i)*mm+3]);
}
summed_timediff+=r2/r1-t2/t1;
no_of_timediff++;
if(no_of_timediff < 100)goto find_pulse;
}
// Filter the power function to reduce noise. Place in cal_fft1_slowsum.
width/=2;
if(width < (int)(cal_interval/64))width=(int)(cal_interval/64);
if(width < 4)width=4;
ja=fft1_size-width;
jb=width;
width=2*width+1;
dsum1=0;
for(i=0; i<=jb; i++)dsum1+=cal_fft1_sumsq[i];
for(i=ja; i<fft1_size; i++)dsum1+=cal_fft1_sumsq[i];
for(i=0; i<fft1_size; i++) {
jb=(jb+1)&(fft1_size-1);
if(jb >= fft1_size)jb-=fft1_size;
cal_fft1_slowsum[i]=(float)dsum1/(float)width;
dsum1+=cal_fft1_sumsq[jb]-cal_fft1_sumsq[ja];
ja=(ja+1)&(fft1_size-1);
}
// Locate the surrounding pulses.
ja=(int)(0.5F*cal_interval);
jb=(int)(1.5F*cal_interval);
t1=0;
for(i=ja; i<jb; i++) {
if(cal_fft1_slowsum[i] > t1) {
t1=cal_fft1_slowsum[i];
ib=i;
}
}
ja=fft1_size-(int)(1.5F*cal_interval);
jb=fft1_size-(int)(0.5F*cal_interval);
t1=0;
ic=ja;
for(i=ja; i<jb; i++) {
if(cal_fft1_slowsum[i] > t1) {
t1=cal_fft1_slowsum[i];
ic=i;
}
}
// ib and ic point to the peaks of surrounding pulses.
// skip a range after the previous pulse and before the next one.
ib=(int)((1-SKIP_BEFORE)*(float)ib);
ic=fft1_size-(int)((float)(fft1_size-ic)*(1.0F-SKIP_AFTER));
// When we pick the range ic to ib we may create a discontinuity.
// because there may be a DC level.
// Compute the DC level around ib and ic and add a straight line
// that will make the average DC level zero at both ends.
mask=fft1_size-1;
jj=2+(int)0.05*cal_interval;
for(j=0; j<mm; j++) {
sum[j]=0;
isum[j]=0;
}
for(i=0; i<jj; i++) {
for(j=0; j<mm; j++) {
sum[j]+=cal_buf2[(ib+i+1)*mm+j]+cal_buf2[(ib-i)*mm+j];
isum[j]+=cal_buf2[(ic+i)*mm+j]+cal_buf2[(ic-i-1)*mm+j];
}
}
for(j=0; j<mm; j++) {
sum[j]/=2*jj;
isum[j]/=2*jj;
sum[j]=(sum[j]-isum[j])/( (ib-ic-1)&mask );
}
ja=ic;
while(ja != ib) {
for(j=0; j<mm; j++) {
cal_buf2[ja*mm+j]-=(float)isum[j];
isum[j]+=sum[j];
}
ja=(ja+1)&mask;
}
// Attenuate before and after the pulse with a cos squared window.
k=fft1_size-ic;
if(ib < k)k=ib;
k/=2;
ja=ic+k;
jb=ib-k;
t1=0;
for(i=0; i<k; i++) {
t2=(float)pow(cos(t1),2.0);
for(j=0; j<mm; j++) {
cal_buf2[ja*mm+j]*=t2;
cal_buf2[jb*mm+j]*=t2;
}
t1+=(float)PI_L/(2*(float)k);
ja--;
jb++;
}
ia=ja;
ib=jb;
for(i=jb; i<=ja; i++) {
for(j=0; j<mm; j++) {
cal_buf2[i*mm+j]=0;
}
}
if(show_flag) {
if(cal_domain == 1) {
for(j=0; j<mm; j+=2) {
for(i=0; i<screen_width; i++) {
k=i-screen_width/3;
k=(int)((float)k*cal_xgain);
k+=cal_xshift;
k&=(fft1_size-1);
lir_setpixel(i, cal_graph[screen_width*j+i], 0);
t2=0.00001F*cal_ygain*cal_buf2[mm*k+j];
if(t2 <-cal_ymax)t2=-cal_ymax;
if(t2 >cal_ymax)t2=cal_ymax;
if(j > 1)t2-=0.32F;
cal_graph[screen_width*j+i]=
(short int)((float)screen_height*(cal_yzer-t2));
lir_setpixel(i, cal_graph[screen_width*j+i], 13);
lir_setpixel(i, cal_graph[screen_width*(j+1)+i], 0);
t2=0.00001F*cal_ygain*cal_buf2[mm*k+j+1];
if(t2 <-cal_ymax)t2=-cal_ymax;
if(t2 >cal_ymax)t2=cal_ymax;
if(j > 1)t2-=0.32F;
cal_graph[screen_width*(j+1)+i]=
(short int)((float)screen_height*(cal_yzer-t2));
lir_setpixel(i, cal_graph[screen_width*(j+1)+i], 10);
}
}
lir_refresh_screen();
show_flag=FALSE;
}
}
for(j=0; j<ui.rx_rf_channels; j++)collect_powermax[j]=0;
// Now that we have a single pulse (hopefully), get the
// fourier transform of it.
for(j=0; j<mm; j+=2) {
jj=j/2;
for(i=0; i<ib; i++) {
cal_tmp[2*i ]=cal_buf2[mm*i+j ];
cal_tmp[2*i+1]=cal_buf2[mm*i+j+1];
}
k=fft2_size-1;
for(i=fft1_size-1; i>ia; i--) {
cal_tmp[2*k ]=cal_buf2[mm*i+j ];
cal_tmp[2*k+1]=cal_buf2[mm*i+j+1];
k--;
}
while(k >= ib) {
cal_tmp[2*k ]=0;
cal_tmp[2*k+1]=0;
k--;
}
fftforward(fft2_size, fft2_n, cal_tmp, fft2_tab, fft2_permute,fft2_n > 12);
if( (ui.rx_input_mode&IQ_DATA) != 0)fft_iqshift(fft2_size, cal_tmp);
for(i=0; i<fft2_size; i++) {
cal_buf2[mm*i+j ]=cal_tmp[2*i ];
cal_buf2[mm*i+j+1]=cal_tmp[2*i+1];
}
// The complex transform must not contain high frequencies because the
// filter function must vary slowly with frequency.
// Store a low pass filtered version in cal_buf3 as complex numbers
// with the corresponding filtered powers in cal_buf6
dsum1=dsum2=0;
n=2*siz128;
for(i=2; i<n+2; i++) {
dsum1+=cal_tmp[2*i];
dsum2+=cal_tmp[2*i+1];
}
for(i=0; i<siz128+2; i++) {
cal_buf3[mm*i+j ]=(float)(dsum1/n);
cal_buf3[mm*i+j+1]=(float)(dsum2/n);
cal_buf6[mm*i+j ]=(float)(pow(dsum1/n,2.0)+pow(dsum2/n,2.0));
}
ja=fft2_size-siz128-1;
if( (ui.rx_input_mode&IQ_DATA) == 0) {
for(i=siz128+2; i<ja; i++) {
cal_buf3[mm*i+j ]=(float)(dsum1/n);
cal_buf3[mm*i+j+1]=(float)(dsum2/n);
cal_buf6[mm*i+j ]=(float)(pow(dsum1/n,2.0)+pow(dsum2/n,2.0));
if(cal_buf6[mm*i+j ]>collect_powermax[jj]) {
collect_powermax[jj]=cal_buf6[mm*i+j ];
}
dsum1+=cal_tmp[2*(i+siz128) ]-cal_tmp[2*(i-siz128) ];
dsum2+=cal_tmp[2*(i+siz128)+1]-cal_tmp[2*(i-siz128)+1];
}
}
// ******************************************************
// In direct conversion mode there may be a discontinuity at fft2_size/2
// because the A/D converters are AC coupled.
else {
jb=fft2_size/2-siz128-1;
for(i=siz128+2; i<jb; i++) {
cal_buf3[mm*i+j ]=(float)(dsum1/n);
cal_buf3[mm*i+j+1]=(float)(dsum2/n);
cal_buf6[mm*i+j ]=(float)(pow(dsum1/n,2.0)+pow(dsum2/n,2.0));
if(cal_buf6[mm*i+j ]>collect_powermax[jj]) {
collect_powermax[jj]=cal_buf6[mm*i+j ];
}
dsum1+=cal_tmp[2*(i+siz128)]-cal_tmp[2*(i-siz128)];
dsum2+=cal_tmp[2*(i+siz128)+1]-cal_tmp[2*(i-siz128)+1];
}
for(i=jb; i<fft2_size/2; i++) {
cal_buf3[mm*i+j ]=(float)(dsum1/n);
cal_buf3[mm*i+j+1]=(float)(dsum2/n);
cal_buf6[mm*i+j ]=(float)(pow(dsum1/n,2.0)+pow(dsum2/n,2.0));
}
dsum1=dsum2=0;
jb=fft2_size/2+2*siz128+3;
for(i=fft2_size/2+3; i<jb; i++) {
dsum1+=cal_tmp[2*i];
dsum2+=cal_tmp[2*i+1];
}
jb=fft2_size/2+siz128+1;
for(i=fft2_size/2+1; i<jb; i++) {
cal_buf3[mm*i+j ]=(float)(dsum1/n);
cal_buf3[mm*i+j+1]=(float)(dsum2/n);
cal_buf6[mm*i+j ]=(float)(pow(dsum1/n,2.0)+pow(dsum2/n,2.0));
}
for(i=jb; i<ja; i++) {
cal_buf3[mm*i+j ]=(float)(dsum1/n);
cal_buf3[mm*i+j+1]=(float)(dsum2/n);
cal_buf6[mm*i+j ]=(float)(pow(dsum1/n,2.0)+pow(dsum2/n,2.0));
if(cal_buf6[mm*i+j ]>collect_powermax[jj])
collect_powermax[jj]=cal_buf6[mm*i+j ];
dsum1+=cal_tmp[2*(i+siz128)]-cal_tmp[2*(i-siz128)];
dsum2+=cal_tmp[2*(i+siz128)+1]-cal_tmp[2*(i-siz128)+1];
}
cal_buf3[ui.rx_rf_channels*fft2_size+j ]=
(cal_buf3[ui.rx_rf_channels*(fft2_size+2)+j ]+
cal_buf3[ui.rx_rf_channels*(fft2_size-2)+j ])/2;
cal_buf3[ui.rx_rf_channels*fft2_size+j+1]=
(cal_buf3[ui.rx_rf_channels*(fft2_size+2)+j+1]+
cal_buf3[ui.rx_rf_channels*(fft2_size-2)+j+1])/2;
cal_buf6[ui.rx_rf_channels*fft2_size+j]=
(cal_buf6[ui.rx_rf_channels*(fft2_size+2)+j]+
cal_buf6[ui.rx_rf_channels*(fft2_size-2)+j])/2;
}
for(i=ja; i<fft2_size; i++) {
cal_buf3[mm*i+j ]=(float)(dsum1/n);
cal_buf3[mm*i+j+1]=(float)(dsum2/n);
cal_buf6[mm*i+j ]=(float)(pow(dsum1/n,2.0)+pow(dsum2/n,2.0));
}
}
// ******************************************************
//Valid spectra:
//cal_buf5 = accumulated power and d2phase/df2 (not normalized)
//cal_buf4 = accumulated power and phase (normalised)
//cal_buf2 = current pulse: complex amplitude
//cal_buf3 = current pulse: smoothed complex amplitude
//cal_buf6 = current pulse: smoothed power
// ******************************************************
// Collect noise weighted by power spectrum
// Also store the noise in cal_buf6
for(j=0; j<mm; j+=2) {
dc[j]=0;
dc[j+1]=0;
}
if( (ui.rx_input_mode&IQ_DATA) == 0) {
ib=fft2_size-siz128;
} else {
ib=fft2_size/2-siz128;
}
for(i=siz128; i<ib; i++) {
for(j=0; j<mm; j+=2) {
t1=cal_buf6[mm*i+j ];
t2=(float)(pow(cal_buf2[mm*i+j ]-cal_buf3[mm*i+j ],2.0)+
pow(cal_buf2[mm*i+j+1]-cal_buf3[mm*i+j+1],2.0));
cal_buf6[mm*i+j+1]=t2;
dc[j]+=t1*t2;
dc[j+1]+=t1;
}
}
if( (ui.rx_input_mode&IQ_DATA) != 0) {
ib=fft2_size-siz128;
for(i=fft2_size/2+siz128; i<ib; i++) {
for(j=0; j<mm; j+=2) {
t1=cal_buf6[mm*i+j ];
t2=(float)(pow(cal_buf2[mm*i+j ]-cal_buf3[mm*i+j ],2.0)+
pow(cal_buf2[mm*i+j+1]-cal_buf3[mm*i+j+1],2.0));
cal_buf6[mm*i+j+1]=t2;
dc[j]+=t1*t2;
dc[j+1]+=t1;
}
}
}
for(i=0; i<siz128; i++) {
for(j=0; j<mm; j+=2) {
cal_buf6[mm*i+j+1]=(float)
(pow(cal_buf2[mm*i+j ]-cal_buf3[mm*i+j ],2.0)+
pow(cal_buf2[mm*i+j+1]-cal_buf3[mm*i+j+1],2.0));
}
}
for(i=ib; i<fft2_size; i++) {
for(j=0; j<mm; j+=2) {
cal_buf6[mm*i+j+1]=(float)(
pow(cal_buf2[mm*i+j ]-cal_buf3[mm*i+j ],2.0)+
pow(cal_buf2[mm*i+j+1]-cal_buf3[mm*i+j+1],2.0));
}
}
if( (ui.rx_input_mode&IQ_DATA) != 0) {
ib=fft2_size/2+siz128;
for(j=0; j<mm; j+=2) {
for(i=fft2_size/2-siz128; i<ib; i++) {
cal_buf6[mm*i+j+1]=(float)
(pow(cal_buf2[mm*i+j ]-cal_buf3[mm*i+j ],2.0)+
pow(cal_buf2[mm*i+j+1]-cal_buf3[mm*i+j+1],2.0));
}
}
}
if(show_flag == TRUE) {
if(cal_domain == 2) {
for(j=0; j<mm; j+=2) {
for(i=0; i<screen_width; i++) {
if( (i&0x7f) == 0)lir_sched_yield();
k=i*fft2_size/screen_width;
k=(int)((float)k*cal_xgain);
k+=cal_xshift;
k&=(fft2_size-1);
lir_setpixel(i, cal_graph[screen_width*j+i], 0);
t2=0.0001F*cal_ygain*(cal_buf2[mm*k+j+1]-cal_buf3[mm*k+j+1]);
if(t2 <-cal_ymax)t2=-cal_ymax;
if(t2 >cal_ymax)t2=cal_ymax;
if(j > 1)t2-=0.32F;
cal_graph[screen_width*j+i]=(short int)
((float)screen_height*(cal_yzer-t2));
lir_setpixel(i, cal_graph[screen_width*j+i], 13);
lir_setpixel(i, cal_graph[screen_width*(j+1)+i], 0);
t2=0.0001F*cal_ygain*cal_buf3[mm*k+j+1];
if(t2 <-cal_ymax)t2=-cal_ymax;
if(t2 >cal_ymax)t2=cal_ymax;
if(j > 1)t2-=0.32F;
cal_graph[screen_width*(j+1)+i]=
(short int)((float)screen_height*(0.5F-t2));
lir_setpixel(i, cal_graph[screen_width*(j+1)+i], 10);
}
}
lir_refresh_screen();
show_flag=FALSE;
}
}
for(j=0; j<mm; j+=2) {
dc[j]/=dc[j+1];
}
for(j=0; j<ui.rx_rf_channels; j++) {
t1=-10*(float)(log10(dc[2*j]/collect_powermax[j]));
sprintf(s,"(%.1f)",t1);
lir_text(8+20*(j+ui.rx_rf_channels),TOPLINE+3,s);
}
if(collected_pulses < START_PULSES) {
collected_pulses++;
for(j=0; j<ui.rx_rf_channels; j++) {
collect_noiselevel[j]+=dc[2*j];
collect_powerlevel[j]+=collect_powermax[j];
t1=-10*(float)(log10(collect_noiselevel[j]/collect_powerlevel[j]));
sprintf(s,"S/N %.1fdB",t1);
lir_text(20*j,TOPLINE+3,s);
}
if(collected_pulses < START_PULSES)goto go_get_data;
for(j=0; j<ui.rx_rf_channels; j++) {
collect_noiselevel[j]/=START_PULSES;
collect_powerlevel[j]/=START_PULSES;
}
if(t1 < STON_LIMIT) {
clear_lines(3,13);
sprintf(s,"Pulse S/N not good enough (%.1f) Limit %ddB",
t1,STON_LIMIT);
lir_text(0,ERRLINE,s);
lir_text(0,ERRLINE+1,"Amplify pulses, reduce noise or increase PRF");
lir_text(0,ERRLINE+2,
"Reason may also be old bad correction function");
lir_text(5,ERRLINE+4,"I => Ignore (=try anyway)");
lir_text(5,ERRLINE+5,"S => Save (bad?) correction on hard disk.");
lir_text(5,ERRLINE+6,"A => Clear old correction function.");
lir_refresh_screen();
goto errkbd;
}
}
for(j=0; j<ui.rx_rf_channels; j++) {
t1=collect_noiselevel[j]/collect_powerlevel[j];
t2=dc[2*j]/collect_powermax[j];
if(t2<0.4*t1) {
pulse_error[3]++;
goto find_pulse;
}
if(1.5*collect_powermax[j]<collect_powerlevel[j]) {
pulse_error[2]++;
goto find_pulse;
}
}
// ******************************************************
//Valid spectra:
//cal_buf5 = accumulated power and d2phase/df2 (not normalised)
//cal_buf4 = accumulated power and phase (normalised)
//cal_buf2 = current pulse: complex amplitude
//cal_buf3 = current pulse: smoothed complex amplitude
//cal_buf6 = current pulse: smoothed power and noise power
// ******************************************************
// This pulse is probably ok.
// Convert the complex data in cal_buf2 to power and phase.