subroutine decjt9(ss,id2,nutc,nfqso,newdat,npts8,nfa,nfsplit,nfb,ntol, & nzhsym,nagain,ndepth,nmode) include 'constants.f90' real ss(184,NSMAX) character*22 msg real*4 ccfred(NSMAX) real*4 red2(NSMAX) logical ccfok(NSMAX) logical done(NSMAX) integer*2 id2(NTMAX*12000) integer*1 i1SoftSymbols(207) save ccfred,red2 nsynced=0 ndecoded=0 nsps=6912 !Params for JT9-1 df3=1500.0/2048.0 tstep=0.5*nsps/12000.0 !Half-symbol step (seconds) done=.false. nf0=0 nf1=nfa if(nmode.eq.65+9) nf1=nfsplit ia=max(1,nint((nf1-nf0)/df3)) ib=min(NSMAX,nint((nfb-nf0)/df3)) lag1=-int(2.5/tstep + 0.9999) lag2=int(5.0/tstep + 0.9999) if(newdat.ne.0) then call timer('sync9 ',0) call sync9(ss,nzhsym,lag1,lag2,ia,ib,ccfred,red2,ipk) call timer('sync9 ',1) endif nsps8=nsps/8 df8=1500.0/nsps8 dblim=db(864.0/nsps8) - 26.2 do nqd=1,0,-1 limit=5000 ccflim=3.0 red2lim=1.6 schklim=2.2 if(ndepth.eq.2) then limit=10000 ccflim=2.7 endif if(ndepth.ge.3 .or. nqd.eq.1) then limit=30000 ccflim=2.5 endif if(nagain.ne.0) then limit=100000 ccflim=2.4 endif ccfok=.false. if(nqd.eq.1) then nfa1=nfqso-ntol nfb1=nfqso+ntol ia=max(1,nint((nfa1-nf0)/df3)) ib=min(NSMAX,nint((nfb1-nf0)/df3)) ccfok(ia:ib)=(ccfred(ia:ib).gt.(ccflim-2.0)) .and. & (red2(ia:ib).gt.(red2lim-1.0)) ia1=ia ib1=ib else nfa1=nf1 nfb1=nfb ia=max(1,nint((nfa1-nf0)/df3)) ib=min(NSMAX,nint((nfb1-nf0)/df3)) do i=ia,ib ccfok(i)=ccfred(i).gt.ccflim .and. red2(i).gt.red2lim enddo ccfok(ia1:ib1)=.false. endif fgood=0. do i=ia,ib if(done(i) .or. (.not.ccfok(i))) cycle f=(i-1)*df3 if(nqd.eq.1 .or. & (ccfred(i).ge.ccflim .and. abs(f-fgood).gt.10.0*df8)) then if(nqd.eq.0) nfreqs0=nfreqs0+1 if(nqd.eq.1) nfreqs1=nfreqs1+1 call timer('softsym ',0) fpk=nf0 + df3*(i-1) call softsym(id2,npts8,nsps8,newdat,fpk,syncpk,snrdb,xdt, & freq,drift,schk,i1SoftSymbols) call timer('softsym ',1) sync=(syncpk+1)/4.0 if(maxval(i1SoftSymbols).eq.0) cycle if(nqd.eq.1 .and. ((sync.lt.0.5) .or. (schk.lt.2.0))) cycle if(nqd.ne.1 .and. ((sync.lt.1.0) .or. (schk.lt.schklim))) cycle call timer('jt9fano ',0) call jt9fano(i1SoftSymbols,limit,nlim,msg) call timer('jt9fano ',1) if(sync.lt.0.0 .or. snrdb.lt.dblim-2.0) sync=0.0 nsync=int(sync) if(nsync.gt.10) nsync=10 nsnr=nint(snrdb) ndrift=nint(drift/df3) if(msg.ne.' ') then if(nqd.eq.0) ndecodes0=ndecodes0+1 if(nqd.eq.1) ndecodes1=ndecodes1+1 !$omp critical(decode_results) ! serialize writes - see also jt65a.f90 write(*,1000) nutc,nsnr,xdt,nint(freq),msg write(13,1002) nutc,nsync,nsnr,xdt,freq,ndrift,msg call flush(6) call flush(13) !$omp end critical(decode_results) 1000 format(i4.4,i4,f5.1,i5,1x,'@',1x,a22) 1002 format(i4.4,i4,i5,f6.1,f8.0,i4,3x,a22,' JT9') iaa=max(1,i-1) ibb=min(NSMAX,i+22) fgood=f nsynced=1 ndecoded=1 ccfok(iaa:ibb)=.false. done(iaa:ibb)=.true. endif endif enddo if(nagain.ne.0) exit enddo return end subroutine decjt9