mirror of
https://github.com/saitohirga/WSJT-X.git
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131 lines
3.5 KiB
Fortran
131 lines
3.5 KiB
Fortran
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subroutine decjt9(ss,id2,nutc,nfqso,newdat,npts8,nfa,nfsplit,nfb,ntol, &
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nzhsym,nagain,ndepth,nmode)
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include 'constants.f90'
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real ss(184,NSMAX)
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character*22 msg
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real*4 ccfred(NSMAX)
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real*4 red2(NSMAX)
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logical ccfok(NSMAX)
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logical done(NSMAX)
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integer*2 id2(NTMAX*12000)
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integer*1 i1SoftSymbols(207)
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nsynced=0
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ndecoded=0
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nsps=6912 !Params for JT9-1
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df3=1500.0/2048.0
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tstep=0.5*nsps/12000.0 !Half-symbol step (seconds)
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done=.false.
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nf0=0
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nf1=nfa
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if(nmode.eq.65+9) nf1=nfsplit
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ia=max(1,nint((nf1-nf0)/df3))
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ib=min(NSMAX,nint((nfb-nf0)/df3))
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lag1=-int(2.5/tstep + 0.9999)
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lag2=int(5.0/tstep + 0.9999)
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if(newdat.ne.0) then
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call timer('sync9 ',0)
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call sync9(ss,nzhsym,lag1,lag2,ia,ib,ccfred,red2,ipk)
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call timer('sync9 ',1)
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endif
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nsps8=nsps/8
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df8=1500.0/nsps8
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dblim=db(864.0/nsps8) - 26.2
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do nqd=1,0,-1
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limit=5000
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ccflim=3.0
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red2lim=1.6
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schklim=2.2
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if(ndepth.eq.2) then
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limit=10000
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ccflim=2.7
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endif
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if(ndepth.ge.3 .or. nqd.eq.1) then
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limit=50000
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ccflim=2.5
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endif
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ccfok=.false.
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if(nqd.eq.1) then
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nfa1=nfqso-ntol
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nfb1=nfqso+ntol
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ia=max(1,nint((nfa1-nf0)/df3))
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ib=min(NSMAX,nint((nfb1-nf0)/df3))
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ccfok(ia:ib)=(ccfred(ia:ib).gt.(ccflim-2.0)) .and. &
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(red2(ia:ib).gt.(red2lim-1.0))
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ia1=ia
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ib1=ib
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else
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nfa1=nf1
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nfb1=nfb
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ia=max(1,nint((nfa1-nf0)/df3))
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ib=min(NSMAX,nint((nfb1-nf0)/df3))
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do i=ia,ib
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ccfok(i)=ccfred(i).gt.ccflim .and. red2(i).gt.red2lim
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enddo
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ccfok(ia1:ib1)=.false.
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endif
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fgood=0.
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do i=ia,ib
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if(done(i) .or. (.not.ccfok(i))) cycle
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f=(i-1)*df3
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if(nqd.eq.1 .or. &
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(ccfred(i).ge.ccflim .and. abs(f-fgood).gt.10.0*df8)) then
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if(nqd.eq.0) nfreqs0=nfreqs0+1
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if(nqd.eq.1) nfreqs1=nfreqs1+1
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call timer('softsym ',0)
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fpk=nf0 + df3*(i-1)
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call softsym(id2,npts8,nsps8,newdat,fpk,syncpk,snrdb,xdt, &
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freq,drift,schk,i1SoftSymbols)
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call timer('softsym ',1)
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sync=(syncpk+1)/4.0
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if(maxval(i1SoftSymbols).eq.0) cycle
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if(nqd.eq.1 .and. ((sync.lt.0.5) .or. (schk.lt.2.0))) cycle
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if(nqd.ne.1 .and. ((sync.lt.1.0) .or. (schk.lt.schklim))) cycle
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call timer('jt9fano ',0)
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call jt9fano(i1SoftSymbols,limit,nlim,msg)
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call timer('jt9fano ',1)
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if(sync.lt.0.0 .or. snrdb.lt.dblim-2.0) sync=0.0
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nsync=int(sync)
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if(nsync.gt.10) nsync=10
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nsnr=nint(snrdb)
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ndrift=nint(drift/df3)
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if(msg.ne.' ') then
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if(nqd.eq.0) ndecodes0=ndecodes0+1
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if(nqd.eq.1) ndecodes1=ndecodes1+1
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write(*,1000) nutc,nsnr,xdt,nint(freq),msg
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1000 format(i4.4,i4,f5.1,i5,1x,'@',1x,a22)
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write(13,1002) nutc,nsync,nsnr,xdt,freq,ndrift,msg
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1002 format(i4.4,i4,i5,f6.1,f8.0,i4,3x,a22,' JT9')
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iaa=max(1,i-1)
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ibb=min(NSMAX,i+22)
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fgood=f
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nsynced=1
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ndecoded=1
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ccfok(iaa:ibb)=.false.
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done(iaa:ibb)=.true.
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call flush(6)
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endif
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endif
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enddo
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call flush(6)
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if(nagain.ne.0) exit
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enddo
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return
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end subroutine decjt9
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