mirror of https://github.com/pavel-demin/ft8d.git
105 lines
3.1 KiB
Fortran
105 lines
3.1 KiB
Fortran
program ft8d
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! Decode FT8 data read from *.c2 files.
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include 'ft8_params.f90'
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character infile*80,datetime*13,message*22,msg37*37
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character*22 allmessages(100)
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character*12 mycall12,hiscall12
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character*6 mygrid6,hisgrid6
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real s(NFFT1,NHSYM)
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real sbase(NFFT1)
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real candidate(3,200)
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real*8 dialfreq
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complex dd(NMAX)
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logical newdat,lsubtract,ldupe,bcontest
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integer apsym(KK)
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integer allsnrs(100)
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save s,dd
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nargs=iargc()
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if(nargs.lt.1) then
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print*,'Usage: ft8d file1 [file2 ...]'
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go to 999
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endif
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nfiles=nargs
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twopi=8.0*atan(1.0)
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fs=4000.0 !Sample rate
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dt=1.0/fs !Sample interval (s)
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tt=NSPS*dt !Duration of "itone" symbols (s)
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ts=2*NSPS*dt !Duration of OQPSK symbols (s)
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baud=1.0/tt !Keying rate (baud)
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txt=NZ*dt !Transmission length (s)
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nfa=-1600
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nfb=+1600
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nfqso=0
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do ifile=1,nfiles
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call getarg(ifile,infile)
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open(10,file=infile,status='old',access='stream')
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read(10,end=999) dialfreq,dd
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close(10)
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j2=index(infile,'.c2')
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read(infile(j2-6:j2-1),*) nutc
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datetime=infile(j2-13:j2-1)
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ndecodes=0
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allmessages=' '
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allsnrs=0
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ndepth=1
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npass=1
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do ipass=1,npass
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newdat=.true.
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syncmin=1.5
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if(ipass.eq.1) then
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lsubtract=.true.
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if(ndepth.eq.1) lsubtract=.false.
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elseif(ipass.eq.2) then
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n2=ndecodes
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if(ndecodes.eq.0) cycle
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lsubtract=.true.
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elseif(ipass.eq.3) then
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if((ndecodes-n2).eq.0) cycle
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lsubtract=.false.
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endif
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call sync8(dd,nfa+2000,nfb+2000,syncmin,nfqso+2000,s,candidate,ncand,sbase)
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do icand=1,ncand
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sync=candidate(3,icand)
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f1=candidate(1,icand)
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xdt=candidate(2,icand)
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xbase=10.0**(0.1*(sbase(nint(f1/3.125))-40.0))
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nsnr0=min(99,nint(10.0*log10(sync) - 25.5)) ! ### empirical ###
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call ft8b(dd,newdat,nQSOProgress,nfqso+2000,nftx,ndepth,lft8apon, &
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lapcqonly,napwid,lsubtract,nagain,iaptype,mycall12,mygrid6, &
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hiscall12,bcontest,sync,f1,xdt,xbase,apsym,nharderrors,dmin, &
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nbadcrc,iappass,iera,msg37,xsnr)
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message=msg37(1:22)
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nsnr=nint(xsnr)
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xdt=xdt-0.5
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hd=nharderrors+dmin
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if(nbadcrc.eq.0) then
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if(bcontest) then
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call fix_contest_msg(mygrid6,message)
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msg37(1:22)=message
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endif
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ldupe=.false.
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do id=1,ndecodes
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if(message.eq.allmessages(id).and.nsnr.le.allsnrs(id)) ldupe=.true.
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enddo
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if(.not.ldupe) then
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ndecodes=ndecodes+1
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allmessages(ndecodes)=message
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allsnrs(ndecodes)=nsnr
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endif
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write(*,1004) nutc,ipass,iaptype,iappass, &
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nharderrors,dmin,hd,min(sync,999.0),nint(xsnr), &
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xdt,nint(f1-2000+dialfreq),message
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1004 format(i6.6,3i2,i3,3f6.1,i4,f6.2,i9,1x,a22)
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endif
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enddo
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enddo
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enddo ! ifile loop
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999 end program ft8d
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