mirror of https://github.com/saitohirga/WSJT-X.git
144 lines
4.4 KiB
Fortran
144 lines
4.4 KiB
Fortran
subroutine jt65a(dd0,npts,newdat,nutc,nf1,nf2,nfqso,ntol,nsubmode, &
|
|
minsync,nagain,n2pass,ntrials,naggressive,ndepth,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)
|
|
! integer*2 id2(NZMAX)
|
|
real ss(322,NSZ)
|
|
real savg(NSZ)
|
|
real a(5)
|
|
character*22 decoded,decoded0
|
|
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(30)
|
|
common/decstats/ntry65a,ntry65b,n65a,n65b,num9,numfano
|
|
common/steve/thresh0
|
|
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 ! use thresh0=2.0 for -24dB files when using 1-bit sync ccf
|
|
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)
|
|
|
|
ncand=0
|
|
nrobust=0 ! controls use of robust correlation estimator in sync65
|
|
call timer('sync65 ',0)
|
|
call sync65(ss,nfa,nfb,nhsym,ca,ncand,nrobust) !Get a list of JT65 candidates
|
|
call timer('sync65 ',1)
|
|
|
|
! When AGC threshold is set too low, noise will suddenly quiet when a strong
|
|
! signal starts up. This causes a lot of false syncs, and bogs down the decoder.
|
|
! If 1-bit correlation doesn't tame the resulting false syncs then, as a last
|
|
! resort, drop down to nrials=100.
|
|
if(ncand.ge.50) then
|
|
ncand=0
|
|
nrobust=1
|
|
call timer('sync65 ',0)
|
|
call sync65(ss,nfa,nfb,nhsym,ca,ncand,nrobust) !Get a list of JT65 candidates
|
|
call timer('sync65 ',1)
|
|
endif
|
|
!write(*,*) 'ncand',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=""
|
|
|
|
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,sync2,a,dtx,nsf,nhist,decoded)
|
|
call timer('decod65a',1)
|
|
!write(*,*) icand,freq+a(1),dtx,sync1,sync2
|
|
if(decoded.eq.decoded0) 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
|
|
!$omp critical(decode_results)
|
|
ndupe=0 ! de-dedupe
|
|
do i=1, ndecoded
|
|
if( decoded==dec(i)%decoded ) ndupe=1
|
|
enddo
|
|
if(ndupe.ne.1) then
|
|
if(ipass.eq.1) n65a=n65a + 1
|
|
if(ipass.eq.2) n65b=n65b + 1
|
|
ndecoded=ndecoded+1
|
|
dec(ndecoded)%freq=freq+a(1)
|
|
dec(ndecoded)%dt=dtx
|
|
dec(ndecoded)%sync=sync2
|
|
dec(ndecoded)%decoded=decoded
|
|
write(*,1010) nutc,nsnr,dtx-1.0,nfreq,decoded
|
|
1010 format(i4.4,i4,f5.1,i5,1x,'#',1x,a22)
|
|
write(13,1012) nutc,nint(sync1),nsnr,dtx-1.0,float(nfreq),ndrift, &
|
|
decoded,nsf
|
|
1012 format(i4.4,i4,i5,f6.1,f8.0,i4,3x,a22,' JT65',i4)
|
|
call flush(6)
|
|
call flush(13)
|
|
endif
|
|
!$omp end critical(decode_results)
|
|
endif
|
|
enddo !candidate loop
|
|
if(ndecoded.lt.1) exit
|
|
enddo !two-pass loop
|
|
|
|
return
|
|
end subroutine jt65a
|