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Make the Q65 red sync curve at least 21 tone-spacings wide, even if FTol is smaller.

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This commit is contained in:
Joe Taylor 2020-12-21 13:33:54 -05:00
parent 545079e951
commit 44516dbbc1
1 changed files with 18 additions and 17 deletions

35
lib/q65_sync.f90
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@ -48,14 +48,15 @@ subroutine q65_sync(nutc,iwave,nmax,mode_q65,codewords,ncw,nsps,nfqso,ntol, &
jz=(txt+1.0)*12000.0/istep !Number of quarter-symbol steps
if(nsps.ge.6912) jz=(txt+2.0)*12000.0/istep !For TR 60 s and higher
ia=ntol/df
ia2=max(ia,10*mode_q65)
nsmo=int(0.7*mode_q65*mode_q65)
if(nsmo.lt.1) nsmo=1
allocate(s1(iz,jz))
allocate(s3(-64:LL-65,63))
allocate(c0(0:nfft-1))
allocate(ccf(-ia:ia,-53:214))
allocate(ccf1(-ia:ia))
allocate(ccf(-ia2:ia2,-53:214))
allocate(ccf1(-ia2:ia2))
if(sync(1).eq.99.0) then !Generate the sync vector
sync=-22.0/63.0 !Sync tone OFF
@ -66,10 +67,10 @@ subroutine q65_sync(nutc,iwave,nmax,mode_q65,codewords,ncw,nsps,nfqso,ntol, &
fac=1/32767.0
do j=1,jz !Compute symbol spectra at step size
ia=(j-1)*istep
ib=ia+nsps-1
i1=(j-1)*istep
i2=i1+nsps-1
k=-1
do i=ia,ib,2 !Load iwave data into complex array c0, for r2c FFT
do i=i1,i2,2 !Load iwave data into complex array c0, for r2c FFT
xx=iwave(i)
yy=iwave(i+1)
k=k+1
@ -99,7 +100,6 @@ subroutine q65_sync(nutc,iwave,nmax,mode_q65,codewords,ncw,nsps,nfqso,ntol, &
enddo
dtstep=nsps/(NSTEP*12000.0) !Step size in seconds
ia=ntol/df
lag1=-1.0/dtstep
lag2=1.0/dtstep + 0.9999
j0=0.5/dtstep
@ -135,23 +135,23 @@ subroutine q65_sync(nutc,iwave,nmax,mode_q65,codewords,ncw,nsps,nfqso,ntol, &
do k=1,85
j=j0 + NSTEP*(k-1) + 1 + lag
if(j.ge.1 .and. j.le.jz) then
do i=-ia,ia
do i=-ia2,ia2
ii=i0+mode_q65*itone(k)+i
if(ii.ge.1 .and. ii.le.iz) ccf(i,lag)=ccf(i,lag) + s1(ii,j)
enddo
endif
enddo
enddo
ccfmax=maxval(ccf)
ccfmax=maxval(ccf(-ia:ia,:))
if(ccfmax.gt.ccf_best) then
ccf_best=ccfmax
ijpk=maxloc(ccf)
ijpk=maxloc(ccf(-ia:ia,:))
ipk=ijpk(1)-ia-1
jpk=ijpk(2)-53-1
f0=nfqso + (ipk-1)*df
xdt=jpk*dtstep
imsg_best=imsg
ccf1=ccf(-ia:ia,jpk)
ccf1=ccf(:,jpk)
endif
enddo ! imsg
@ -192,8 +192,8 @@ subroutine q65_sync(nutc,iwave,nmax,mode_q65,codewords,ncw,nsps,nfqso,ntol, &
! irc,trim(decoded)
!3055 format(i6,i3,6f8.2,i5,2x,a)
! close(55)
ic=ia/4;
base=(sum(ccf1(-ia:-ia+ic)) + sum(ccf1(ia-ic:ia)))/(2.0+2.0*ic);
ic=ia2/4;
base=(sum(ccf1(-ia2:-ia2+ic)) + sum(ccf1(ia2-ic:ia2)))/(2.0+2.0*ic);
ccf1=ccf1-base
smax=maxval(ccf1)
if(smax.gt.10.0) ccf1=10.0*ccf1/smax
@ -207,20 +207,19 @@ subroutine q65_sync(nutc,iwave,nmax,mode_q65,codewords,ncw,nsps,nfqso,ntol, &
100 ccf=0.
irc=-2
dat4=0
ia=ntol/df
do lag=lag1,lag2
do k=1,85
n=NSTEP*(k-1) + 1
j=n+lag+j0
if(j.ge.1 .and. j.le.jz) then
do i=-ia,ia
do i=-ia2,ia2
if(i0+i.lt.1 .or. i0+i.gt.iz) cycle
ccf(i,lag)=ccf(i,lag) + sync(k)*s1(i0+i,j)
enddo
endif
enddo
enddo
ijpk=maxloc(ccf)
ijpk=maxloc(ccf(-ia:ia,:))
ipk=ijpk(1)-ia-1
jpk=ijpk(2)-53-1
@ -229,7 +228,7 @@ subroutine q65_sync(nutc,iwave,nmax,mode_q65,codewords,ncw,nsps,nfqso,ntol, &
sq=0.
nsq=0
jd=(lag2-lag1)/4
do i=-ia,ia
do i=-ia2,ia2
do j=lag1,lag2
if(abs(j-jpk).gt.jd .and. abs(i-ipk).gt.ia/2) then
sq=sq + ccf(i,j)**2
@ -240,7 +239,7 @@ subroutine q65_sync(nutc,iwave,nmax,mode_q65,codewords,ncw,nsps,nfqso,ntol, &
rms=sqrt(sq/nsq)
smax=ccf(ipk,jpk)
snr1=smax/rms
ccf1=ccf(-ia:ia,jpk)/rms
ccf1=ccf(:,jpk)/rms
if(snr1.gt.10.0) ccf1=(10.0/snr1)*ccf1
200 smax=maxval(ccf1)
@ -249,6 +248,8 @@ subroutine q65_sync(nutc,iwave,nmax,mode_q65,codewords,ncw,nsps,nfqso,ntol, &
do i=-ia,ia
if(i1.eq.-9999 .and. ccf1(i).ge.0.5*smax) i1=i
if(i2.eq.-9999 .and. ccf1(-i).ge.0.5*smax) i2=-i
enddo
do i=-ia2,ia2
freq=nfqso + i*df
write(17,1100) freq,ccf1(i),xdt
1100 format(3f10.3)