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Sort out some stuff having to do with multiple decodes in Q65 mode.

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This commit is contained in:
Joe Taylor 2023-01-04 12:02:10 -05:00
parent 3b0e2edb75
commit fc040d435a
2 changed files with 61 additions and 12 deletions
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16
lib/q65_decode.f90
View File

@ -70,6 +70,7 @@ contains
character*80 fmt
integer*2 iwave(NMAX) !Raw data
real, allocatable :: dd(:) !Raw data
real f0decodes(100)
integer dat4(13) !Decoded message as 12 6-bit integers
integer dgen(13)
logical lclearave,lnewdat0,lapcqonly,unpk77_success
@ -83,8 +84,13 @@ contains
call sec0(0,tdecode)
ndecodes=0
decodes=' '
f0decodes=0.
nfa=nfa0
nfb=nfb0
if(single_decode) then
nfa=nfqso-ntol
nfb=nfqso+ntol
endif
nqd=nqd0
lnewdat=lnewdat0
max_drift=max_drift0
@ -169,8 +175,6 @@ contains
call q65_dec0(iavg,nutc,iwave,ntrperiod,nfqso,ntol,ndepth,lclearave, &
emedelay,xdt,f0,snr1,width,dat4,snr2,idec,stageno)
call timer('q65_dec0',1)
! write(*,3001) '=a',nfqso,ntol,ndepth,xdt,f0,idec
!3001 format(a2,3i5,f7.2,f7.1,i5)
if(idec.ge.0) then
dtdec=xdt !We have a q3 or q0 decode at nfqso
@ -280,6 +284,7 @@ contains
if(idupe.eq.0) then
ndecodes=min(ndecodes+1,100)
decodes(ndecodes)=decoded
f0decodes(ndecodes)=f0dec
call q65_snr(dat4,dtdec,f0dec,mode_q65,nused,snr2)
nsnr=nint(snr2)
call this%callback(nutc,snr1,nsnr,dtdec,f0dec,decoded, &
@ -317,6 +322,10 @@ contains
snr1=candidates(icand,1)
xdt= candidates(icand,2)
f0 = candidates(icand,3)
do i=1,ndecodes
fdiff=f0-f0decodes(i)
if(fdiff.gt.-baud*mode_q65 .and. fdiff.lt.65*baud*mode_q65) go to 800
enddo
jpk0=(xdt+1.0)*6000 !Index of nominal start of signal
if(ntrperiod.le.30) jpk0=(xdt+0.5)*6000 !For shortest sequences
if(jpk0.lt.0) jpk0=0
@ -365,6 +374,7 @@ contains
if(idupe.eq.0) then
ndecodes=min(ndecodes+1,100)
decodes(ndecodes)=decoded
f0decodes(ndecodes)=f0dec
call q65_snr(dat4,dtdec,f0dec,mode_q65,nused,snr2)
nsnr=nint(snr2)
call this%callback(nutc,snr1,nsnr,dtdec,f0dec,decoded, &
@ -373,6 +383,7 @@ contains
if(iand(ndepth,128).ne.0 .and. .not.lagain .and. &
int(abs(f0dec-nfqso)).le.ntol ) call q65_clravg !AutoClrAvg
call sec0(1,tdecode)
ios=1
! open(22,file=trim(data_dir)//'/q65_decodes.dat',status='unknown',&
! position='append',iostat=ios)
if(ios.eq.0) then
@ -394,6 +405,7 @@ contains
endif
endif
endif
800 continue
enddo ! icand
if(iavg.eq.0 .and.navg(iseq).ge.2 .and. iand(ndepth,16).ne.0) go to 50
900 return

55
lib/qra/q65/q65.f90
View File

@ -148,15 +148,15 @@ subroutine q65_dec0(iavg,nutc,iwave,ntrperiod,nfqso,ntol,ndepth,lclearave, &
ii1=max(1,i0-64)
ii2=i0-65+LL
call pctile(s1(ii1:ii2,1:jz),ii2-ii1+1*jz,45,base)
s1=s1/base
! s1=s1/base
s1raw=s1
! Apply fast AGC to the symbol spectra
s1max=20.0 !Empirical choice
do j=1,jz !### Maybe wrong way? ###
smax=maxval(s1(ii1:ii2,j))
if(smax.gt.s1max) s1(ii1:ii2,j)=s1(ii1:ii2,j)*s1max/smax
enddo
! s1max=20.0 !Empirical choice
! do j=1,jz !### Maybe wrong way? ###
! smax=maxval(s1(ii1:ii2,j))
! if(smax.gt.s1max) s1(ii1:ii2,j)=s1(ii1:ii2,j)*s1max/smax
! enddo
dat4=0
if(ncw.gt.0 .and. iavg.le.1) then
@ -489,11 +489,14 @@ subroutine q65_ccf_22(s1,iz,jz,nfqso,ntol,ndepth,ntrperiod,iavg,ipk,jpk, &
real ccf2(iz) !Orange sync curve
real, allocatable :: xdt2(:)
real, allocatable :: s1avg(:)
real, allocatable :: ccf_lag(:)
integer, allocatable :: indx(:)
integer ipk1(1)
allocate(xdt2(iz))
allocate(s1avg(iz))
allocate(indx(iz))
allocate(ccf_lag(lag1:lag2))
ia=max(nfa,100)/df
ib=min(nfb,4900)/df
@ -507,12 +510,15 @@ subroutine q65_ccf_22(s1,iz,jz,nfqso,ntol,ndepth,ntrperiod,iavg,ipk,jpk, &
s1avg(i)=sum(s1(i,1:jz))
enddo
call pctile(s1avg(ia:ib),ib-ia+1,40,base0)
ccfbest=0.
ibest=0
lagpk=0
lagbest=0
idrift_best=0
do i=ia,ib
stest=s1avg(i)/(1.015*base0)
if(stest.lt.1.4) cycle
ccfmax=0.
do lag=lag1,lag2
do idrift=-max_drift,max_drift
@ -533,6 +539,40 @@ subroutine q65_ccf_22(s1,iz,jz,nfqso,ntol,ndepth,ntrperiod,iavg,ipk,jpk, &
endif
enddo ! idrift
enddo ! lag
! Look at SNR on the "blue curve"
idrift=idrift_max
do lag=lag1,lag2
ccft=0.
do kk=1,22
k=isync(kk)
ii=i + nint(idrift*(k-43)/85.0)
if(ii.lt.1 .or. ii.gt.iz) cycle
n=NSTEP*(k-1) + 1
j=n+lag+j0
if(j.ge.1 .and. j.le.jz) ccft=ccft + s1(ii,j)
enddo ! kk
ccf_lag(lag)=ccft - (22.0/jz)*s1avg(i)
enddo
pk=maxval(ccf_lag)
ipk1=maxloc(ccf_lag)
lag0=ipk1(1)-1+lag1
xsum=0.
sq=0.
nsum=0
do j=lag1,lag2
if(abs(j-lag0).gt.7) then
xsum=xsum+ccf_lag(j)
sq=sq+ccf_lag(j)**2
nsum=nsum+1
endif
enddo
ave=xsum/nsum
rms=sqrt(sq/nsum - ave*ave)
snr=(pk-ave)/rms
if(snr.lt.5.0) cycle !Blue SNR must be at least 5
ccf2(i)=ccfmax
xdt2(i)=lagpk*dtstep
if(ccfmax.gt.ccfbest .and. abs(i*df-nfqso).le.ftol) then
@ -554,8 +594,6 @@ subroutine q65_ccf_22(s1,iz,jz,nfqso,ntol,ndepth,ntrperiod,iavg,ipk,jpk, &
! Save parameters for best candidates
jzz=ib-ia+1
call pctile(ccf2(ia:ib),jzz,40,base)
ccf2=ccf2/base
call indexx(ccf2(ia:ib),jzz,indx)
ncand=0
maxcand=20
@ -563,7 +601,6 @@ subroutine q65_ccf_22(s1,iz,jz,nfqso,ntol,ndepth,ntrperiod,iavg,ipk,jpk, &
k=jzz-j+1
if(k.lt.1 .or. k.gt.iz) cycle
i=indx(k)+ia-1
if(ccf2(i).lt.3.3) exit !Candidate limit
f=i*df
i3=max(1, i-mode_q65)
i4=min(iz,i+mode_q65)