2014-04-19 22:44:47 -04:00
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subroutine decoder(ss,id2)
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! Decoder for JT9.
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use prog_args
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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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character*20 datetime
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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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logical done65,baddata
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integer*2 id2(NTMAX*12000)
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real*4 dd(NTMAX*12000)
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integer*1 i1SoftSymbols(207)
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common/npar/nutc,ndiskdat,ntrperiod,nfqso,newdat,npts8,nfa,nfsplit,nfb, &
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ntol,kin,nzhsym,nsave,nagain,ndepth,ntxmode,nmode,datetime
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common/tracer/limtrace,lu
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save
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call system_clock(iclock0,iclock_rate,iclock_max) !###
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nfreqs0=0
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nfreqs1=0
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ndecodes0=0
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ndecodes1=0
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if (nagain .eq. 0) then
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open(13,file='decoded.txt',status='unknown')
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else
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open(13,file='decoded.txt',status='unknown',position='append')
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end if
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open(22,file='kvasd.dat',access='direct',recl=1024,status='unknown')
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npts65=52*12000
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if(baddata(id2,npts65)) then
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nsynced=0
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ndecoded=0
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go to 800
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endif
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ntol65=20
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done65=.false.
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if((nmode.eq.65 .or. nmode.eq.65+9) .and. ntxmode.eq.65) then
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if(newdat.ne.0) dd(1:npts65)=id2(1:npts65)
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nf1=nfa
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nf2=nfb
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if(nmode.eq.65+9) nf2=nfsplit
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call jt65a(dd,npts65,newdat,nutc,nf1,nf2,nfqso,ntol65,nagain,ndecoded)
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done65=.true.
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endif
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if(nmode.eq.65) go to 800
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nsynced=0
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ndecoded=0
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nsps=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=-(2.5/tstep + 0.9999)
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lag2=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=1000
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ccflim=4.0
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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=3.5
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endif
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if(ndepth.ge.3 .or. nqd.eq.1) then
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limit=100000
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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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! write(71,3001) nqd,i,f,fpk,ccfred(i),red2(i),schk
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!3001 format(2i6,2f8.1,3f6.1)
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! call flush(71)
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if(schk.lt.schklim) cycle
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call timer('decode9 ',0)
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call decode9(i1SoftSymbols,limit,nlim,msg)
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call timer('decode9 ',1)
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sync=(syncpk+1)/4.0
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if(sync.lt.0.0 .or. snrdb.lt.dblim-2.0) sync=0.0
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nsync=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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if(nmode.ge.65 .and. (.not.done65)) then
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if(newdat.ne.0) dd(1:npts65)=id2(1:npts65)
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nf1=nfa
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nf2=nfb
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call jt65a(dd,npts65,newdat,nutc,nf1,nf2,nfqso,ntol65,nagain,ndecoded)
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endif
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!### JT65 is not yet producing info for nsynced, ndecoded.
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800 write(*,1010) nsynced,ndecoded
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1010 format('<DecodeFinished>',2i4)
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call flush(6)
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close(13)
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close(22)
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return
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end subroutine decoder
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