mirror of https://github.com/saitohirga/WSJT-X.git
187 lines
5.0 KiB
Fortran
187 lines
5.0 KiB
Fortran
subroutine decoder(ss,c0,nstandalone)
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! Decoder for JT9.
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parameter (NMAX=1800*12000) !Total sample intervals per 30 minutes
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parameter (NDMAX=1800*1500) !Sample intervals at 1500 Hz rate
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parameter (NSMAX=22000) !Max length of saved spectra
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real ss(184,NSMAX)
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character*22 msg
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character*80 fmt
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character*20 datetime
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real*4 ccfred(NSMAX)
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logical ccfok(NSMAX)
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logical done(NSMAX)
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integer*1 i1SoftSymbols(207)
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complex c0(NDMAX)
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common/npar/nutc,ndiskdat,ntrperiod,nfqso,newdat,npts8,nfa,nfb,ntol, &
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kin,nzhsym,nsave,nagain,ndepth,nrxlog,nfsample,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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call timer('decoder ',0)
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open(13,file='decoded.txt',status='unknown')
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ntrMinutes=ntrperiod/60
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newdat=1
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nsynced=0
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ndecoded=0
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nsps=0
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if(ntrMinutes.eq.1) then
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nsps=6912
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df3=1500.0/2048.0
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fmt='(i4.4,i4,i5,f6.1,f8.0,i4,3x,a22)'
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else if(ntrMinutes.eq.2) then
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nsps=15360
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df3=1500.0/2048.0
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fmt='(i4.4,i4,i5,f6.1,f8.0,i4,3x,a22)'
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else if(ntrMinutes.eq.5) then
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nsps=40960
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df3=1500.0/6144.0
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fmt='(i4.4,i4,i5,f6.1,f8.1,i4,3x,a22)'
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else if(ntrMinutes.eq.10) then
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nsps=82944
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df3=1500.0/12288.0
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fmt='(i4.4,i4,i5,f6.1,f8.2,i4,3x,a22)'
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else if(ntrMinutes.eq.30) then
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nsps=252000
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df3=1500.0/32768.0
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fmt='(i4.4,i4,i5,f6.1,f8.2,i4,3x,a22)'
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endif
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if(nsps.eq.0) stop 'Error: bad TRperiod' !Better: return an error code###
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tstep=0.5*nsps/12000.0 !Half-symbol step (seconds)
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! idf=ntol/df3 + 0.999
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done=.false.
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do nqd=1,0,-1
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limit=5000
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ccflim=4.0
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if(ndepth.ge.2) then
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limit=50000
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ccflim=3.0
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endif
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if(ndepth.ge.3 .or. nqd.eq.1) then
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limit=200000
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ccflim=2.5
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endif
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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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else
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nfa1=nfa
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nfb1=nfb
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endif
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ia=max(1,nint((nfa1-1000)/df3))
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ib=min(NSMAX,nint((nfb1-1000)/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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call timer('sync9 ',0)
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! Compute ccfred()
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call sync9(ss,nzhsym,lag1,lag2,ia,ib,ccfred,ipk)
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call timer('sync9 ',1)
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ccfok=.false.
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if(nqd.eq.1) then
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ccfok(ipk)=.true.
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do i=ia,ib
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ccfok(i)=ccfred(i).gt.ccflim
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enddo
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ia1=ia
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ib1=ib
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else
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do i=ia,ib
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ccfok(i)=ccfred(i).gt.ccflim
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enddo
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ccfok(ia1:ib1)=.false.
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endif
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nRxLog=0
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fgood=0.
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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 i=ia,ib
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f=(i-1)*df3
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if(done(i) .or. (.not.ccfok(i)) .or. (ccfred(i).lt.ccflim-1.0) .or. &
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(ccfred(i).lt.ccfred(i+1))) cycle
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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=1000.0 + df3*(i-1)
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call softsym(c0,npts8,nsps8,newdat,fpk,syncpk,snrdb,xdt,freq, &
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drift,i1SoftSymbols)
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call timer('softsym ',1)
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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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write(38,3002) nutc,nsnr,i,ccfred(i),nlim,msg
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3002 format(i4.4,i5,i6,f8.1,i9,2x,a22)
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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(*,fmt) nutc,nsync,nsnr,xdt,freq,ndrift,msg
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write(13,fmt) nutc,nsync,nsnr,xdt,freq,ndrift,msg
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! write(14,1014) nutc,nsync,nsnr,xdt,freq,ndrift,ccfred(i),nlim,msg
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!1014 format(i4.4,i4,i5,f6.1,f8.0,i4,f9.1,i9,3x,a22)
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iaa=max(1,i-3)
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ibb=min(NSMAX,i+11)
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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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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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! call flush(14)
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call timer('decoder ',1)
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if(nstandalone.eq.0) call timer('decoder ',101)
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call system_clock(iclock,iclock_rate,iclock_max)
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write(39,3001) nutc,nfreqs1,nfreqs0,ndecodes1,ndecodes0, &
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float(iclock-iclock0)/iclock_rate
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3001 format(5i8,f10.3)
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call flush(38)
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call flush(39)
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return
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end subroutine decoder
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