WSJT-X/lib/jt65a.f90

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5.2 KiB
Fortran
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subroutine jt65a(dd0,npts,newdat,nutc,nf1,nf2,nfqso,ntol,nsubmode, &
minsync,nagain,n2pass,nrobust,ntrials,naggressive,ndepth, &
mycall,hiscall,hisgrid,nexp_decode,ndecoded)
! Process dd0() data to find and decode JT65 signals.
parameter (NSZ=3413,NZMAX=60*12000)
parameter (NFFT=1000)
real dd0(NZMAX)
real dd(NZMAX)
real ss(322,NSZ)
real savg(NSZ)
real a(5)
character*22 decoded,decoded0
character mycall*12,hiscall*12,hisgrid*6
type candidate
real freq
real dt
real sync
end type candidate
type(candidate) ca(300)
type decode
real freq
real dt
real sync
character*22 decoded
end type decode
type(decode) dec(50)
common/decstats/ntry65a,ntry65b,n65a,n65b,num9,numfano
common/steve/thresh0
common/test000/ncandidates,nhard_min,nsoft_min,nera_best,nsofter_min, &
ntotal_min,ntry,nq1000,ntot !### TEST ONLY ###
save
dd=dd0
ndecoded=0
do ipass=1,n2pass ! 2-pass decoding loop
newdat=1
if(ipass.eq.1) then !first-pass parameters
thresh0=2.5
nsubtract=1
elseif( ipass.eq.2 ) then !second-pass parameters
thresh0=2.5
nsubtract=0
endif
if(n2pass.lt.2) nsubtract=0
! if(newdat.ne.0) then
call timer('symsp65 ',0)
ss=0.
call symspec65(dd,npts,ss,nhsym,savg) !Get normalized symbol spectra
call timer('symsp65 ',1)
! endif
nfa=nf1
nfb=nf2
! nfa=max(200,nfqso-ntol)
! nfb=min(4000,nfqso+ntol)
! nrobust = 0: use float ccf. Only if ncand>50 fall back to robust (1-bit) ccf
! nrobust = 1: use only robust (1-bit) ccf
ncand=0
if(nrobust.eq.0) then
call timer('sync65 ',0)
call sync65(ss,nfa,nfb,nhsym,ca,ncand,0)
call timer('sync65 ',1)
endif
if(ncand.gt.50) nrobust=1
if(nrobust.eq.1) then
ncand=0
call timer('sync65 ',0)
call sync65(ss,nfa,nfb,nhsym,ca,ncand,1)
call timer('sync65 ',1)
endif
call fqso_first(nfqso,ntol,ca,ncand)
nvec=ntrials
if(ncand.gt.75) then
! write(*,*) 'Pass ',ipass,' ncandidates too large ',ncand
nvec=100
endif
df=12000.0/NFFT !df = 12000.0/8192 = 1.465 Hz
mode65=2**nsubmode
nflip=1 !### temporary ###
nqd=0
decoded0=""
freq0=0.
do icand=1,ncand
freq=ca(icand)%freq
dtx=ca(icand)%dt
sync1=ca(icand)%sync
if(ipass.eq.1) ntry65a=ntry65a + 1
if(ipass.eq.2) ntry65b=ntry65b + 1
call timer('decod65a',0)
call decode65a(dd,npts,newdat,nqd,freq,nflip,mode65,nvec, &
naggressive,ndepth,mycall,hiscall,hisgrid,nexp_decode, &
sync2,a,dtx,nft,qual,nhist,decoded)
call timer('decod65a',1)
!### Suppress false decodes in crowded HF bands ###
if(naggressive.eq.0 .and. ntrials.le.10000) then
if(ntry.eq.ntrials .or. ncandidates.eq.100) then
if(nhard_min.ge.42 .or. ntotal_min.ge.71) cycle
endif
endif
if(decoded.eq.decoded0 .and. abs(freq-freq0).lt. 3.0 .and. &
minsync.ge.0) cycle !Don't display dupes
if(decoded.ne.' ' .or. minsync.lt.0) then
if( nsubtract .eq. 1 ) then
call timer('subtr65 ',0)
call subtract65(dd,npts,freq,dtx)
call timer('subtr65 ',1)
endif
nfreq=nint(freq+a(1))
ndrift=nint(2.0*a(2))
s2db=10.0*log10(sync2) - 35 !### empirical ###
nsnr=nint(s2db)
if(nsnr.lt.-30) nsnr=-30
if(nsnr.gt.-1) nsnr=-1
! Serialize writes - see also decjt9.f90
!$omp critical(decode_results)
ndupe=0 ! de-dedupe
do i=1, ndecoded
if(decoded==dec(i)%decoded) then
ndupe=1
exit
endif
enddo
if(ndupe.ne.1 .or. minsync.lt.0) then
if(ipass.eq.1) n65a=n65a + 1
if(ipass.eq.2) n65b=n65b + 1
ndecoded=ndecoded+1
dec(ndecoded)%freq=freq+a(1)
dec(ndecoded)%dt=dtx
dec(ndecoded)%sync=sync2
dec(ndecoded)%decoded=decoded
nqual=qual
! if(nqual.gt.10) nqual=10
write(*,1010) nutc,nsnr,dtx-1.0,nfreq,decoded
1010 format(i4.4,i4,f5.1,i5,1x,'#',1x,a22)
write(13,1012) nutc,nint(sync1),nsnr,dtx-1.0,float(nfreq),ndrift, &
decoded,nft
1012 format(i4.4,i4,i5,f6.1,f8.0,i4,3x,a22,' JT65',i4)
call flush(6)
call flush(13)
! write(79,3001) nutc,nint(sync1),nsnr,dtx-1.0,nfreq,ncandidates, &
! nhard_min,ntotal_min,ntry,naggressive,nft,nqual,decoded
!3001 format(i4.4,i3,i4,f6.2,i5,i7,i3,i4,i8,i3,i2,i5,1x,a22)
! flush(79)
endif
decoded0=decoded
freq0=freq
if(decoded0.eq.' ') decoded0='*'
!$omp end critical(decode_results)
endif
enddo !candidate loop
if(ndecoded.lt.1) exit
enddo !two-pass loop
return
end subroutine jt65a