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calsub2.c
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calsub2.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 <string.h>
#include "globdef.h"
#include "uidef.h"
#include "fft1def.h"
#include "fft2def.h"
#include "llsqdef.h"
#include "caldef.h"
#include "keyboard_def.h"
#if OSNUM == OSNUM_WINDOWS
#include "wscreen.h"
#endif
#if OSNUM == OSNUM_LINUX
#include "lscreen.h"
#endif
#define IQ_FIT_MINFREQ 500
#define CORR_MINLEVEL 0.001
#define CORR_MAXLEVEL 20.
#define YSH 0.29
#define ERF_START -2.2
#define ERF_END 2.8
#define SYMFIT_ERROR -1
#define SYMFIT_ACCEPT -2
#define SYMFIT_CHANGE_LIMITS -3
void draw_fitline(void)
{
int i;
i=screen_width*(-1+4*(float)(cal_midlim)/fft1_size);
lir_line(i,screen_height*(cal_yzer+YSH),i,screen_height*(cal_yzer-YSH),2);
}
void make_symfit(int kk, int even, float *buf, float offset)
{
int i, k, m, mm;
float t1, t2, t3, fft1_hsize;
mm=twice_rxchan;
fft1_hsize=0.5*(fft1_size-1);
k=0;
for(i=cal_lowedge; i<cal_midlim; i++) {
t1=cal_buf5[i];
t2=1-i/fft1_hsize;
if(kk == 1)llsq_derivatives[k]=t1;
if(even == 1) {
t2=t2*t2;
t3=t1*t2;
} else {
t3=t1*t2;
t2=t2*t2;
}
for(m=kk; m<llsq_npar; m++) {
llsq_derivatives[m*llsq_neq+k]=t3;
t3*=t2;
}
llsq_errors[2*k]=t1*(buf[mm*i ]-offset);
if(ui.rx_rf_channels == 2) {
llsq_errors[2*k+1]=t1*(buf[mm*i+2]-offset);
} else {
llsq_errors[2*k+1]=0;
}
k++;
}
if(llsq2() != 0) {
lirerr(1050);
return;
}
// Store the fitted curve in cal_buf
for(i=0; i<=fft1_size/2; i++) {
t2=1-i/fft1_hsize;
cal_buf[mm*i]=offset+kk*llsq_steps[0];
if(ui.rx_rf_channels == 2)cal_buf[mm*i+2]=offset+kk*llsq_steps[1];
if(even == 1) {
t2=t2*t2;
t3=t2;
} else {
t3=t2;
t2=t2*t2;
}
for(m=kk; m<llsq_npar; m++) {
cal_buf[mm*i ]+=llsq_steps[2*m]*t3;
if(ui.rx_rf_channels == 2) {
cal_buf[mm*i+2]+=llsq_steps[2*m+1]*t3;
}
t3*=t2;
}
}
}
int symmetry_fit_decide(float *buf, float offset, char *txt)
{
char s[80];
float t2;
int i,j,k,mm;
float center_region_ia;
int center_region_pix;
center_region_ia=0.4;
symfit_begin:
;
cal_type=CAL_TYPE_FIX_CENTER_SYMFIT;
cal_initscreen();
mm=twice_rxchan;
lir_text(0,1,"Curve fitting to response of direct conversion receiver.");
lir_text(0,2,txt);
for(j=0; j<ui.rx_rf_channels; j++) {
sprintf(s,"Ch%d",j);
lir_text(0,j+3,s);
for(k=0; k<llsq_npar; k++) {
if(llsq_steps[j+2*k] < 1000) {
sprintf(s,"%.4f",llsq_steps[j+2*k]);
} else {
sprintf(s,"%.0f",llsq_steps[j+2*k]);
}
lir_text(4+11*k,j+3,s);
}
}
lir_text(2,6, " +- => Change Y-scale");
lir_text(2,7, " 0 => Use raw data without curve fit");
lir_text(2,8, "1-9 => Fit with new number of terms");
lir_text(2,9, " C => Enter a larger number than 9 and fit");
lir_text(50,6," A => Use curve fitted with current no of terms");
lir_text(50,8," B => Back, change freq limits");
lir_text(50,9,"L,R => Border left, right");
settextcolor(14);
lir_text(0,10,"Raw data.");
settextcolor(12);
lir_text(16,10,"Difference raw to fitted.");
settextcolor(7);
redraw:
;
center_region_pix=screen_width*(-1+4*center_region_ia);
lir_line(center_region_pix,screen_height*(cal_yzer+YSH),
center_region_pix,screen_height*(cal_yzer-YSH),1);
if(kill_all_flag) return SYMFIT_ERROR;
draw_fitline();
if(kill_all_flag) return SYMFIT_ERROR;
sprintf(s,"Y-gain = %f No of terms = %d ",cal_ygain,llsq_npar);
lir_text(0,5,s);
lir_hline(0,screen_height*cal_yzer,screen_last_xpixel,1);
if(kill_all_flag) return SYMFIT_ERROR;
lir_hline(0,screen_height*(cal_yzer+YSH),screen_last_xpixel,1);
if(kill_all_flag) return SYMFIT_ERROR;
for(i=0; i<screen_width; i++) {
k=i*fft1_size/(4*screen_width)+fft1_size/4;
for(j=0; j<mm; j+=2) {
lir_setpixel(i, cal_graph[screen_width*(2*j )+i], 0);
t2=0.1*cal_ygain*(buf[mm*k+j]-offset);
if(t2 <-cal_ymax)t2=-cal_ymax;
if(t2 >cal_ymax)t2=cal_ymax;
if(j > 0)t2-=YSH;
cal_graph[screen_width*(2*j )+i]=screen_height*(cal_yzer-t2);
lir_setpixel(i, cal_graph[screen_width*(2*j )+i], 14);
lir_setpixel(i, cal_graph[screen_width*(2*j+1)+i], 0);
t2=0.1*cal_ygain*(cal_buf[mm*k+j]-buf[mm*k+j]);
if(t2 <-cal_ymax)t2=-cal_ymax;
if(t2 >cal_ymax)t2=cal_ymax;
if(j > 0)t2-=YSH;
cal_graph[screen_width*(2*j+1)+i]=screen_height*(cal_yzer-t2);
lir_setpixel(i, cal_graph[screen_width*(2*j+1)+i], 12);
}
}
await_processed_keyboard();
if(kill_all_flag) return SYMFIT_ERROR;
if(lir_inkey == 'X')return SYMFIT_ERROR;
if(lir_inkey == F1_KEY || lir_inkey == '!') {
help_message(300);
if(kill_all_flag) return SYMFIT_ERROR;
goto symfit_begin;
}
if(lir_inkey == 'C') {
sprintf(s,"Enter number of terms (10 to %d) =>",LLSQ_MAXPAR);
lir_text(10,12,s);
i=lir_get_integer(11+strlen(s),12,3,10,LLSQ_MAXPAR);
clear_lines(12,12);
return i;
}
if(lir_inkey == 'B')return SYMFIT_CHANGE_LIMITS;
if(lir_inkey >= '0' && lir_inkey <= '9')return lir_inkey-'0';
if(lir_inkey == 'A') {
for(i=center_region_ia*fft1_size; i<=fft1_size/2; i++) {
for(j=0; j<mm; j+=2) {
buf[mm*i+j]=cal_buf[mm*i+j];
}
}
return SYMFIT_ACCEPT;
}
if(lir_inkey == '+')cal_ygain*=2;
if(lir_inkey == '-')cal_ygain/=2;
if(lir_inkey == 'L')center_region_ia-=0.003;
if(center_region_ia < 0.3)center_region_ia=0.3;
if(lir_inkey == 'R')center_region_ia+=0.0025;
if(center_region_ia > 0.4975)center_region_ia=0.4975;
lir_line(center_region_pix,screen_height*(cal_yzer+YSH),
center_region_pix,screen_height*(cal_yzer-YSH),0);
if(kill_all_flag) return SYMFIT_ERROR;
goto redraw;
}
void make_cal_fft1_filtercorr(void)
{
int i;
// We do calibration in fft2_size points (before Linrad-02.28 it
// was done in the much larger size fft1_size)
// Start by reducing the sizes of fft1_desired and fft1_filtercorr.
resize_fft1_desired(fft1_size, fft1_desired, fft2_size, cal_fft1_desired);
for(i=0; i<twice_rxchan*fft1_size; i++)cal_fft1_filtercorr[i]=fft1_filtercorr[i];
convert_filtercorr_fd_to_td(fft1_n, fft1_size, cal_fft1_filtercorr);
resize_filtercorr_td_to_fd(TRUE, fft1_size, cal_fft1_filtercorr,
fft2_n, fft2_size, cal_fft1_filtercorr);
}
void compute_pulse(void)
{
int i, ka, kb, siz128;
siz128=fft2_size/128;
ka=fft2_size/2-siz128;
kb=fft2_size/2+siz128;
if( (ui.rx_input_mode&IQ_DATA) != 0) {
for(i=0; i<siz128; i++) {
cal_tmp[2*i ]=0;
cal_tmp[2*i+1]=0;
}
for(i=ka; i<kb; i++) {
cal_tmp[2*i ]=0;
cal_tmp[2*i+1]=0;
}
for(i=fft2_size-siz128; i<fft2_size; i++) {
cal_tmp[2*i ]=0;
cal_tmp[2*i+1]=0;
}
}
fftback(fft2_size, fft2_n, cal_tmp, fft2_tab, fft2_permute,FALSE);
}
#define PULPTS 8
int cal_update_ram(void)
{
int lowp, midp, higp, siz128;
int cal_hw_lowp;
int cal_hw_higp;
char s[80];
int mm, falloff_length, step;
int ia, ib;
int i, j, k, m, ja, jb, ka, kb;
int refine_cnt;
float t1,t2,t3;
float r1;
float ygain;
float z[MAX_ADCHAN];
float pul[4*PULPTS];
int desired_shape;
char *shape_texts[2]= {"erfc(x)","Parabolic"};
desired_shape=0;
siz128=fft2_size/128;
step=10;
ygain=1;
mm=twice_rxchan;
//clear_screen();
settextcolor(14);
// ******************************************************
// Valid spectra:
// cal_buf4 = accumulated power and phase (normalised in fft2_size points)
// The spectrum in cal_buf4 is what we have while fft1_desired contains
// what we have asked for.
// To get the desired spectrum we have to add one more filter
// to our filter chain.
// The new filter should be fft1_desired/cal_buf4.
// ******************************************************
make_cal_fft1_filtercorr();
// ******************************************************
// The data in buf4 is now contracted to fft2 points
for(refine_cnt=0; refine_cnt<3; refine_cnt++) {
if(ui.rx_rf_channels == 32) {
// If we have two channels, adjust the phase so pulses
// have the same phase in both channels.
for(i=0; i<fft2_size; i++) {
t1=cal_buf4[mm*i ];
t2=cal_buf4[mm*i+1];
cal_tmp[2*i ]=cos(t2)*t1;
cal_tmp[2*i+1]=sin(t2)*t1;
}
compute_pulse();
k=0;
t1=0;
t2=0;
for(i=fft2_size-PULPTS; i<fft2_size; i++) {
pul[2*k ]=cal_tmp[2*i ];
pul[2*k+1]=cal_tmp[2*i+1];
k++;
}
for(i=0; i<PULPTS; i++) {
pul[2*k ]=cal_tmp[2*i ];
pul[2*k+1]=cal_tmp[2*i+1];
k++;
}
for(i=0; i<fft2_size; i++) {
t1=cal_buf4[mm*i+2];
t2=cal_buf4[mm*i+3];
cal_tmp[2*i ]=cos(t2)*t1;
cal_tmp[2*i+1]=sin(t2)*t1;
}
compute_pulse();
k=0;
t1=0;
t2=0;
for(i=fft2_size-PULPTS; i<fft2_size; i++) {
t3=cal_tmp[2*i]*cal_tmp[2*i]+cal_tmp[2*i+1]*cal_tmp[2*i+1]+
pul[2*k]*pul[2*k]+pul[2*k+1]*pul[2*k+1];
r1=atan2(cal_tmp[2*i+1],cal_tmp[2*i])-atan2(pul[2*k+1],pul[2*k]);
if(r1 > PI_L)r1-=2*PI_L;
if(r1 < -PI_L)r1+=2*PI_L;
t1+=t3*r1;
t2+=t3;
k++;
}
for(i=0; i<PULPTS; i++) {
t3=cal_tmp[2*i]*cal_tmp[2*i]+cal_tmp[2*i+1]*cal_tmp[2*i+1]+
pul[2*k]*pul[2*k]+pul[2*k+1]*pul[2*k+1];
r1=atan2(cal_tmp[2*i+1],cal_tmp[2*i])-atan2(pul[2*k+1],pul[2*k]);
if(r1 > PI_L)r1-=2*PI_L;
if(r1 < -PI_L)r1+=2*PI_L;
t1+=t3*r1;
t2+=t3;
k++;
}
t3=t1/t2;
if(t3 > PI_L)t3-=2*PI_L;
if(t3 < -PI_L)t3+=2*PI_L;
t3/=2;
// t3 is now the phase difference between channels. Correct for it.
for(i=0; i<fft2_size; i++) {
cal_buf4[mm*i+1]+=t3;
cal_buf4[mm*i+3]-=t3;
}
}
}
for(i=0; i<2*MAX_ADCHAN*screen_width; i++)cal_graph[i]=0;
for(j=0; j<mm; j++)z[j]=0;
for(i=0; i<mm*fft2_size; i++)cal_buf2[i]=0;
// Since there may be serious errors in the spectrum of the average
// pulse at the spectrum ends, start by locating the passband center.
// for this purpose, skip fft2_size/128 points at each end as well
// as around the center if we run in I/Q mode.
if( (ui.rx_input_mode&IQ_DATA) == 0) {
for(i=siz128; i<fft2_size-siz128; i++) {
if(cal_fft1_desired[i]>0) {
for(j=0; j<mm; j+=2) {
t1=pow(cal_fft1_filtercorr[mm*i+j ],2.0)+pow(cal_fft1_filtercorr[mm*i+j+1],2.0);
if(t1 > 0 ) {
t1=cal_buf4[mm*i+j]/sqrt(t1);
z[j]+=t1*i;
z[j+1]+=t1;
cal_buf2[mm*i+j]=t1;
}
}
}
}
} else {
for(i=siz128; i<fft2_size/2-siz128; i++) {
if(cal_fft1_desired[i]>0) {
for(j=0; j<mm; j+=2) {
t1=pow(cal_fft1_filtercorr[mm*i+j ],2.0)+
pow(cal_fft1_filtercorr[mm*i+j+1],2.0);
if(t1 > 0 ) {
t1=cal_buf4[mm*i+j]/sqrt(t1);
z[j]+=t1*i;
z[j+1]+=t1;
cal_buf2[mm*i+j]=t1;
}
}
}
}
for(i=fft2_size/2+siz128; i<fft2_size-siz128; i++) {
if(cal_fft1_desired[i]>0) {
for(j=0; j<mm; j+=2) {
t1=pow(cal_fft1_filtercorr[mm*i+j ],2.0)+pow(cal_fft1_filtercorr[mm*i+j+1],2.0);
if(t1 > 0 ) {
t1=cal_buf4[mm*i+j]/sqrt(t1);
z[j]+=t1*i;
z[j+1]+=t1;
cal_buf2[mm*i+j]=t1;
}
}
}
}
}
midp=0;
for(j=0; j<mm; j+=2) {
if(z[j+1]==0) {
lirerr(1162);
return 0;
}
midp+=z[j]/z[j+1];
}
midp/=mm>>1;
ia=midp-fft2_size/16;
ib=midp+fft2_size/16;
// Locate the maximum near the midpoint.
for(j=0; j<mm; j+=2) {
z[j]=0;
if( (ui.rx_input_mode&IQ_DATA) == 0) {
for(i=ia; i<ib; i++) {
if(z[j]<cal_buf2[mm*i+j])z[j]=cal_buf2[mm*i+j];
}
} else {
for(i=ia; i<fft2_size/2-siz128; i++) {
if(z[j]<cal_buf2[mm*i+j])z[j]=cal_buf2[mm*i+j];
}
for(i=fft2_size/2+siz128; i<ib; i++) {
if(z[j]<cal_buf2[mm*i+j])z[j]=cal_buf2[mm*i+j];
}
}
z[j]*=.01;
z[j+1]=0;
}
// Locate where the level is -20 dB at the sides relative to the level
// at the center.
lowp=0;
higp=fft2_size-1;
k=0;
while( lowp < midp && k == 0) {
k=1;
for(j=0; j<mm; j+=2) {
if( z[j]>cal_buf2[mm*lowp+j]) k=0;
}
lowp++;
}
m=0;
while(higp > midp && m==0) {
m=1;
for(j=0; j<mm; j+=2) {
if( z[j]>cal_buf2[mm*higp+j])m=0;
}
higp--;
}
// Get a minimum level for filtercorr power to not divide by zero
for(j=0; j<mm; j+=2) {
k=higp-lowp-1;
if( (ui.rx_input_mode&IQ_DATA) == 0) {
for(i=lowp+1; i<higp; i++) {
z[j+1]+=pow(cal_fft1_filtercorr[mm*i+j ],2.0)+
pow(cal_fft1_filtercorr[mm*i+j+1],2.0);
}
} else {
for(i=lowp+1; i<fft2_size/2-siz128; i++) {
z[j+1]+=pow(cal_fft1_filtercorr[mm*i+j ],2.0)+
pow(cal_fft1_filtercorr[mm*i+j+1],2.0);
}
for(i=fft2_size/2+siz128; i<higp; i++) {
z[j+1]+=pow(cal_fft1_filtercorr[mm*i+j ],2.0)+
pow(cal_fft1_filtercorr[mm*i+j+1],2.0);
}
k-=2*siz128;
}
// Set level at -30dB
z[j+1]=0.001*z[j+1]/k;
}
// Store the hardware spectrum in cal_buf2 as amplitude and phase
// Get it as the shape before the correction in filcorr was applied i.e.
// as cal_buf4/fft1_filtercorr
for(i=0; i<fft2_size; i++) {
for(j=0; j<mm; j+=2) {
t1=pow(cal_fft1_filtercorr[mm*i+j ],2.0)+pow(cal_fft1_filtercorr[mm*i+j+1],2.0);
if(t1 > z[j+1] && cal_fft1_desired[i] > 0) {
cal_buf2[mm*i+j]=cal_buf4[mm*i+j]/t1;
cal_buf2[mm*i+j+1]=cal_buf4[mm*i+j+1]-atan2(cal_fft1_filtercorr[mm*i+j+1],
cal_fft1_filtercorr[mm*i+j ]);
} else {
cal_buf2[mm*i+j ]=0;
cal_buf2[mm*i+j+1]=0;
}
}
}
for(j=0; j<mm; j+=2) {
z[j]=0;
if( (ui.rx_input_mode&IQ_DATA) == 0) {
for(i=lowp+1; i<fft2_size; i++) {
if(z[j] < cal_buf2[mm*i+j])z[j]=cal_buf2[mm*i+j];
}
} else {
for(i=lowp+1; i<fft2_size/2-siz128; i++) {
if(z[j] < cal_buf2[mm*i+j])z[j]=cal_buf2[mm*i+j];
}
for(i=fft2_size/2+siz128; i<higp; i++) {
if(z[j] < cal_buf2[mm*i+j])z[j]=cal_buf2[mm*i+j];
}
}
}
for(i=0; i<fft2_size; i++) {
for(j=0; j<mm; j+=2) {
cal_buf2[mm*i+j]/=z[j];
}
}
// ******************************************************
// Valid spectra:
// cal_buf4 = accumulated pulse spectrum, power and phase (normalised)
// cal_buf2 = hardware spectrum, power and phase (normalised)
// ******************************************************
// Locate the MIN_GAIN points at the low and high frequency sides of cal_buf2
#define MIN_GAIN 0.1 //10dB
cal_hw_lowp=lowp;
cal_hw_higp=higp;
k=0;
while(k != ui.rx_rf_channels && cal_hw_lowp < cal_hw_higp) {
k=0;
cal_hw_lowp++;
for(j=0; j<mm; j+=2) {
if(cal_buf2[mm*cal_hw_lowp+j] > MIN_GAIN)k++;
}
}
k=0;
while(k != ui.rx_rf_channels && cal_hw_lowp<=cal_hw_higp) {
k=0;
cal_hw_higp--;
for(j=0; j<mm; j+=2) {
if(cal_buf2[mm*cal_hw_higp+j] > MIN_GAIN)k++;
}
}
screen:
;
cal_type=CAL_TYPE_SET_FILTERSHAPE;
cal_initscreen();
t1=(0.001*fft1_size)/fft2_size;
sprintf(s,"%.1f dB points: %fkHz %fkHz",20*log10(MIN_GAIN),
t1*fft1_hz_per_point*cal_hw_lowp,t1*fft1_hz_per_point*cal_hw_higp);
lir_text(0,1,s);
if( (fft1_calibrate_flag&CALAMP) != CALAMP) {
// This is the first time.
// Place the 75% point of the corrected spectrum at the MIN_GAIN point of
// the hardware. (75% amplitude = -4.4dB)
// Make the slope a parabola, start and stop equally many points away
// from the 75% point.
// Start with a parabola that ends halfway to the farthest end point.
// Store the desired filter with parabolic fall offs in cal_buf5.
falloff_length=cal_hw_lowp-1;
if(fft2_size-cal_hw_higp-2 > falloff_length)
falloff_length=fft2_size-cal_hw_higp-2;
if(desired_shape ==1) {
lowp=cal_hw_lowp;
higp=cal_hw_higp;
} else {
if(fft2_size/(falloff_length+1) > 20) {
falloff_length=fft2_size/20;
if(cal_hw_lowp <= falloff_length)cal_hw_lowp=falloff_length+1;
if(cal_hw_higp > fft2_size-falloff_length-2)
cal_hw_higp=fft2_size-falloff_length-2;
}
t1=(ERF_END-ERF_START)/(ERF_END+0.5);
i=falloff_length;
falloff_length*=t1;
i=falloff_length-i;
lowp=cal_hw_lowp+i;
higp=cal_hw_higp-i;
}
} else {
i=0;
while(cal_fft1_desired[i] == 0 && i<fft2_size)i++;
if(i==fft2_size) {
lirerr(1054);
return 0;
}
k=fft2_size-1;
while(cal_fft1_desired[k] == 0 && k>=i)k--;
j=i;
while(cal_fft1_desired[j] < 0.99999 && j<fft2_size)j++;
falloff_length=(j-i)/2;
if(falloff_length >= (k-i)/4)falloff_length=(k-i)/4-1;
lowp=i+falloff_length;
higp=k-falloff_length;
}
get_ideal_ampl:
;
if(falloff_length >=lowp) {
i=1+(falloff_length-lowp)/2;
lowp+=i;
falloff_length-=i;
}
if(falloff_length >=fft2_size-1-higp) {
i=1+(falloff_length-(fft2_size-higp-1))/2;
higp-=i;
falloff_length-=i;
}
for(i=0; i<lowp; i++)cal_buf5[i]=0;
for(i=higp; i<fft2_size; i++)cal_buf5[i]=0;
for(i=lowp+1; i<higp; i++)cal_buf5[i]=1;
if(desired_shape ==1) {
t1=sqrt(.25)/falloff_length;
t2=1;
t3=t1;
t2=1-t3*t3;
t3+=t1;
ja=lowp+falloff_length;
jb=higp-falloff_length;
while(t2 > 0) {
cal_buf5[ja]=t2;
cal_buf5[jb]=t2;
t2=1-t3*t3;
t3+=t1;
ja--;
jb++;
}
} else {
adjust:
;
ja=lowp+1;
jb=higp-1;
if(jb-ja < falloff_length/2) {
lirerr(9845621);
return 0;
}
t1=(ERF_END-ERF_START)/falloff_length;
t2=ERF_START;
while(t2 < ERF_END) {
t3=0.5*erfc(t2);
cal_buf5[ja]=t3;
cal_buf5[jb]=t3;
t2+=t1;
ja--;
jb++;
if(ja < 0) {
lowp++;
goto adjust;
}
if(jb >= fft2_size) {
higp--;
goto adjust;
}
}
}
// ******************************************************
// Valid spectra:
// cal_buf4 = accumulated pulse spectrum, power and phase (normalised)
// cal_buf2 = hardware spectrum, power and phase (normalised)
// cal_buf5 = desired spectrum (amplitude only)
// ******************************************************
// Divide cal_buf5 by sqrt(cal_buf2) to get the total correction function we need
// to get the desired frequency response.
for(i=0; i<fft2_size; i++) {
for(j=0; j<mm; j+=2) {
if(cal_buf2[mm*i+j]>0) {
cal_buf3[mm*i+j]=cal_buf5[i]/sqrt(cal_buf2[mm*i+j]);
} else {
cal_buf3[mm*i+j]=0;
}
}
}
// Find max of the correction function from both sides.
ja=0;
jb=fft2_size-1;
ka=siz128;
kb=siz128;
for(j=0; j<mm; j++)z[j]=0;
for(i=0; i<fft2_size; i++) {
for(j=0; j<mm; j+=2) {
if(z[j ]<cal_buf3[mm*ja+j]) {
z[j ]=cal_buf3[mm*ja+j];
ka=fft2_size/128;
}
if(z[j+1]<cal_buf3[mm*jb+j]) {
z[j+1]=cal_buf3[mm*jb+j];
kb=fft2_size/128;
}
if(z[j ]==0)ka=fft2_size/128;
if(z[j+1]==0)kb=fft2_size/128;
}
if(ka>0) {
ja++;
ka--;
}
if(kb>0) {
jb--;
kb--;
}
}
for(j=0; j<ui.rx_rf_channels; j++) {
sprintf(s,"Max correction Ch %d low=%.2fdB high=%.2fdB ",
j,20*log10(z[2*j]), 20*log10(z[2*j+1]));
lir_text(0,2+j,s);
}
clear_lines(5,13);
lir_text(0, 5,"| inc | dec | Item |");
lir_text(0, 6,"| A | B | Flat region |");
lir_text(0, 7,"| C | D | Center freq |");
lir_text(0, 8,"| E | F | Steepness |");
sprintf(s, "| I | K | Step %4d |",step);
lir_text(0, 9,s);
lir_text(0,10,"| + | - | Y-Gain |");
lir_text(5,13,"Y=>Accept X=Skip");
settextcolor(15);
lir_text(40,5,"DESIRED AMPLITUDE");
settextcolor(14);
lir_text(40,6,"CORR. AMPLITUDE");
settextcolor(10);
lir_text(40,7,"CORR. PHASE");
settextcolor(7);
sprintf(s,"| M | Shape %s",shape_texts[desired_shape]);
lir_text(40,9,s);
sprintf(s,"| |");
lir_text(40,8,s);
lir_text(40,10,s);
for(i=0; i<screen_width; i++) {
k=i*fft2_size/screen_last_xpixel;
if(k>fft2_size-1)k=fft2_size-1;
//k=fft2_size/2-screen_width/2+i;
for(j=0; j<mm; j+=2) {
lir_setpixel(i, cal_graph[screen_width*(2*j )+i], 0);
t2=0.1*ygain*cal_buf3[mm*k+j];
if(t2 <-cal_ymax)t2=-cal_ymax;
if(t2 >cal_ymax)t2=cal_ymax;
if(j > 0)t2-=YSH;
cal_graph[screen_width*(2*j )+i]=screen_height*(cal_yzer-t2);
lir_setpixel(i, cal_graph[screen_width*(2*j )+i], 14);
lir_setpixel(i, cal_graph[screen_width*(2*j+1)+i], 0);
t2=0.1*ygain*cal_buf5[k];
if(t2 <-cal_ymax)t2=-cal_ymax;
if(t2 >cal_ymax)t2=cal_ymax;
if(j > 0)t2-=YSH;
cal_graph[screen_width*(2*j+1)+i]=screen_height*(cal_yzer-t2);
lir_setpixel(i, cal_graph[screen_width*(2*j+1)+i], 15);
lir_setpixel(i, cal_graph[screen_width*(2*j+2)+i], 0);
t2=0.03*ygain*cal_buf2[mm*k+j+1];
if(t2 <-cal_ymax)t2=-cal_ymax;
if(t2 >cal_ymax)t2=cal_ymax;
if(j > 0)t2-=YSH;
cal_graph[screen_width*(2*j+2)+i]=screen_height*(cal_yzer-t2);
lir_setpixel(i, cal_graph[screen_width*(2*j+2)+i], 10);
}
if(k==fft2_size-1)goto grx;
}
grx:
;
if(ui.rx_rf_channels >1) {
if(z[0] > z[2]) {
t1=z[2]/z[0];
} else {
t1=z[0]/z[2];
}
sprintf(s,"Channel amplitudes %f %f Diff %f dB",
z[0],z[2],-10*log10(t1));
if(t1 < 0.5) {
clear_lines(14,15);
lir_text(0,14,"Channel unbalance too large.");
lir_text(0,15,"Clear old data or adjust hardware!");
}
}
await_processed_keyboard();
if(kill_all_flag) return 0;
switch (lir_inkey) {
case 'X':
return 0;
case '+':
ygain*=2;
break;
case '-':
ygain/=2;
break;
case 'A':
lowp-=step;
if(lowp < 2)lowp=2;
higp+=step;
if(higp > fft2_size-3)higp=fft2_size-3;
break;
case 'B':
lowp+=step;
higp-=step;
if(lowp>higp-2*falloff_length) {
higp=(lowp+higp)/2;
lowp=higp-falloff_length;
higp+=falloff_length;
}
break;
case 'C':
lowp+=step;
higp+=step;
if(higp > fft2_size-3)higp=fft2_size-3;
break;
case 'D':
lowp-=step;
higp-=step;
if(lowp<2)lowp=2;
break;
case 'E':
falloff_length-=step;
if(falloff_length<1)falloff_length=1;
break;
case 'F':
falloff_length+=step;
if(falloff_length>fft2_size/2.5)falloff_length=fft2_size/2.5;
break;
case 'I':
step++;
if(step > siz128)step=siz128;
break;
case 'K':
step--;
if(step < 1)step=1;
break;
case 'M':
desired_shape^=1;
break;
case F1_KEY:
case '!':
help_message(307);
goto screen;
case 'Y':
goto update_ram;
}
goto get_ideal_ampl;
update_ram:
;
// ******************************************************
// Valid spectra:
// cal_buf4 = accumulated pulse spectrum, power and phase (normalised)
// cal_buf2 = hardware spectrum, power and phase (normalised)
// cal_buf5 = desired spectrum (amplitude only)
// ******************************************************
// Renormalise cal_buf4 so the average becomes 1 within the hw limits
for(j=0; j<mm; j+=2)z[j]=0;
for(i=cal_hw_lowp+1; i<cal_hw_higp; i++) {
for(j=0; j<mm; j+=2) {
z[j]+=cal_buf4[mm*i+j ];
}
}
for(j=0; j<mm; j+=2)z[j]/=(cal_hw_higp-cal_hw_lowp-1);
for(i=0; i<fft2_size; i++) {
for(j=0; j<mm; j+=2) {
cal_buf4[mm*i+j ]/=z[j];
}
}
// We get the new filter function as cal_fft1_desired/cal_buf4
// Get the new correction by multiplication onto the old.
fft1_calibrate_flag|=CALAMP;
for(i=0; i<fft2_size; i++) {
cal_fft1_desired[i]=cal_buf5[i];
{
for(j=0; j<mm; j+=2) {
if(cal_buf4[mm*i+j]>0) {
t1=sqrt(pow(cal_fft1_filtercorr[mm*i+j ],2.0)+
pow(cal_fft1_filtercorr[mm*i+j+1],2.0));
t2=atan2(cal_fft1_filtercorr[mm*i+j+1],
cal_fft1_filtercorr[mm*i+j ]);
t1*=cal_fft1_desired[i]/sqrt(cal_buf4[mm*i+j]);
t2-=cal_buf4[mm*i+j+1];
cal_fft1_filtercorr[mm*i+j ]=t1;
cal_fft1_filtercorr[mm*i+j+1]=t2;
} else {
cal_fft1_filtercorr[mm*i+j ]=0;
cal_fft1_filtercorr[mm*i+j+1]=0;
}
}
}
}
for(i=0; i<fft2_size; i++) {
if(cal_fft1_desired[i] > 0) {
for(j=0; j<mm; j+=2) {
t1=cal_fft1_filtercorr[mm*i+j ];
t2=cal_fft1_filtercorr[mm*i+j+1];
cal_fft1_filtercorr[mm*i+j ]=cos(t2)*t1;
cal_fft1_filtercorr[mm*i+j+1]=sin(t2)*t1;
}
} else {
for(j=0; j<mm; j+=2) {
cal_fft1_filtercorr[mm*i+j ]=0;
cal_fft1_filtercorr[mm*i+j+1]=0;
}
}
}
for(i=0; i<mm*fft2_size; i++)cal_tmp[i]=cal_fft1_filtercorr[i];
convert_filtercorr_fd_to_td(fft2_n, fft2_size, cal_tmp);
resize_filtercorr_td_to_fd(TRUE, fft2_size, cal_tmp,
fft1_n, fft1_size, fft1_filtercorr);
resize_fft1_desired(fft2_size, cal_fft1_desired, fft1_size, fft1_desired);
i=0;
while(fft1_desired[i] == 0) {
for(j=0; j<mm; j++) {
fft1_filtercorr[mm*i+j]=0;
}
i++;
if(i==fft1_size)lirerr(936183);
}
i=fft1_size-1;
while(fft1_desired[i] == 0) {
for(j=0; j<mm; j++) {
fft1_filtercorr[mm*i+j]=0;
}
i--;
}
settextcolor(7);
clear_screen();
return 1;
}
void show_missing_cal_info(void)
{
clear_screen();
lir_text(5,5,"There is no calibration function.");
lir_text(5,7,"Run B first for amplitude and phase calibration");
lir_text(8,9,press_any_key);
await_processed_keyboard();
}
int remove_iq_notch(void)
{
char s[80];
int i, j, k, m, n, mm;
float t1,t2,t3;
int old_end, cal_lowedge_min;
float xgain, xmid, ampmax;
// In case the native size of the calibration data is smaller
// than fft1_size, change fft1_size and remember old values in fft2_size.
if(cal_fft1_size == 0) {
show_missing_cal_info();
return 1;
}
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();
fft1_hz_per_point*=(float)(fft2_size)/fft1_size;
}
mm=twice_rxchan;
old_end=0;
llsq_derivatives=malloc(LLSQ_MAXPAR*fft1_size/2*sizeof(float));
if(llsq_derivatives == NULL) {
lirerr(1048);
return 0;
}
llsq_errors=malloc(fft1_size*sizeof(float));
if(llsq_errors == NULL) {
lirerr(1048);
err_ex1:
;
free(llsq_derivatives);
return 0;
}
xgain=(float)(screen_width)/fft1_size;
xmid=fft1_size/2;
// Do not fit curves closer than IQ_FIT_MINFREQ Hz from the center.
// We assume that the phase and amplitude is entirely unaffected
// by the AC coupling at this relatively high frequency.
// The user may change this limit if he so wishes.
cal_midlim=fft1_size/2-1-IQ_FIT_MINFREQ/fft1_hz_per_point;
// Convert fft1_filtercorr to amplitude and phase.
// Split it into a symmetric and an antisymmetric part.
for(i=0; i<fft1_size/2; i++) {
k=fft1_size-1-i;
t1=0;
for(j=0; j<mm; j+=2) {
t2=sqrt(pow(fft1_filtercorr[mm*i+j ],2.0)+
pow(fft1_filtercorr[mm*i+j+1],2.0));
t3=sqrt(pow(fft1_filtercorr[mm*k+j ],2.0)+
pow(fft1_filtercorr[mm*k+j+1],2.0));
if(t2 > 0 && t3 > 0) {
cal_buf6[mm*i+j ]=t2/t3;
cal_buf3[mm*i+j ]=sqrt(t2*t3);
if( cal_buf3[mm*i+j ] > t1)t1=cal_buf3[mm*i+j ];
t2=atan2(fft1_filtercorr[mm*i+j+1],fft1_filtercorr[mm*i+j ]);
t3=atan2(fft1_filtercorr[mm*k+j+1],fft1_filtercorr[mm*k+j ]);
cal_buf6[mm*i+j+1]=(t2-t3)/2;
cal_buf3[mm*i+j+1]=(t2+t3)/2;