module jt65_decode integer, parameter :: NSZ=3413, NZMAX=60*12000, NFFT=1000 type :: jt65_decoder procedure(jt65_decode_callback), pointer :: callback => null() contains procedure :: decode end type jt65_decoder ! ! Callback function to be called with each decode ! abstract interface subroutine jt65_decode_callback(this,utc,sync,snr,dt,freq,drift, & decoded,ft,qual,nsmo,nsum,minsync,nsubmode,naggressive) import jt65_decoder implicit none class(jt65_decoder), intent(inout) :: this integer, intent(in) :: utc real, intent(in) :: sync integer, intent(in) :: snr real, intent(in) :: dt integer, intent(in) :: freq integer, intent(in) :: drift character(len=22), intent(in) :: decoded integer, intent(in) :: ft integer, intent(in) :: qual integer, intent(in) :: nsmo integer, intent(in) :: nsum integer, intent(in) :: minsync integer, intent(in) :: nsubmode integer, intent(in) :: naggressive end subroutine jt65_decode_callback end interface contains subroutine decode(this,callback,dd0,npts,newdat,nutc,nf1,nf2,nfqso, & ntol,nsubmode,minsync,nagain,n2pass,nrobust,ntrials,naggressive, & ndepth,nclearave,mycall,hiscall,hisgrid,nexp_decode) ! Process dd0() data to find and decode JT65 signals. use jt65_mod use timer_module, only: timer include 'constants.f90' class(jt65_decoder), intent(inout) :: this procedure(jt65_decode_callback) :: callback real, intent(in) :: dd0(NZMAX) integer, intent(in) :: npts, nutc, nf1, nf2, nfqso, ntol & , nsubmode, minsync, n2pass, ntrials, naggressive, ndepth & , nexp_decode logical, intent(in) :: newdat, nagain, nrobust character(len=12), intent(in) :: mycall, hiscall character(len=6), intent(in) :: hisgrid real dd(NZMAX) real ss(322,NSZ) real savg(NSZ) real a(5) character*22 decoded,decoded0,avemsg,deepave type candidate real freq real dt real sync end type candidate type(candidate) ca(300) type accepted_decode real freq real dt real sync character*22 decoded end type accepted_decode type(accepted_decode) dec(50) logical :: first_time,robust,prtavg,single_decode integer h0(0:11),d0(0:11) real r0(0:11) common/decstats/ntry65a,ntry65b,n65a,n65b,num9,numfano common/steve/thresh0 ! 0 1 2 3 4 5 6 7 8 9 10 11 data h0/41,42,43,43,44,45,46,47,48,48,49,49/ data d0/71,72,73,74,76,77,78,80,81,82,83,83/ ! 0 1 2 3 4 5 6 7 8 9 10 11 data r0/0.70,0.72,0.74,0.76,0.78,0.80,0.82,0.84,0.86,0.88,0.90,0.90/ data nutc0/-999/,nfreq0/-999/,nsave/0/ save this%callback => callback first_time=newdat robust=nrobust dd=dd0 ndecoded=0 do ipass=1,n2pass ! 2-pass decoding loop first_time=.true. if(ipass.eq.1) then !first-pass parameters thresh0=2.5 nsubtract=1 elseif( ipass.eq.2 ) then !second-pass parameters thresh0=2.5 nsubtract=0 endif if(n2pass.lt.2) nsubtract=0 ! if(newdat) then call timer('symsp65 ',0) ss=0. call symspec65(dd,npts,ss,nhsym,savg) !Get normalized symbol spectra call timer('symsp65 ',1) ! endif nfa=nf1 nfb=nf2 single_decode=iand(nexp_decode,32).ne.0 if(single_decode .or. (naggressive.gt.0 .and. ntol.lt.1000)) then nfa=max(200,nfqso-ntol) nfb=min(4000,nfqso+ntol) thresh0=1.0 endif ! robust = .false.: use float ccf. Only if ncand>50 fall back to robust (1-bit) ccf ! robust = .true. : use only robust (1-bit) ccf ncand=0 if(.not.robust) then call timer('sync65 ',0) call sync65(ss,nfa,nfb,naggressive,ntol,nhsym,ca,ncand,0) call timer('sync65 ',1) endif if(ncand.gt.50) robust=.true. if(robust) then ncand=0 call timer('sync65 ',0) call sync65(ss,nfa,nfb,naggressive,ntol,nhsym,ca,ncand,1) call timer('sync65 ',1) endif ! If a candidate was found within +/- ntol of nfqso, move it into ca(1). call fqso_first(nfqso,ntol,ca,ncand) if(single_decode) ncand=1 nvec=ntrials if(ncand.gt.75) then ! write(*,*) 'Pass ',ipass,' ncandidates too large ',ncand nvec=100 endif df=12000.0/NFFT !df = 12000.0/8192 = 1.465 Hz mode65=2**nsubmode nflip=1 !### temporary ### nqd=0 decoded0="" freq0=0. prtavg=.false. if(.not.nagain) nsum=0 if(nclearave.eq.1) then nsum=0 nsave=0 endif do icand=1,ncand freq=ca(icand)%freq dtx=ca(icand)%dt sync1=ca(icand)%sync if(ipass.eq.1) ntry65a=ntry65a + 1 if(ipass.eq.2) ntry65b=ntry65b + 1 call timer('decod65a',0) call decode65a(dd,npts,first_time,nqd,freq,nflip,mode65,nvec, & naggressive,ndepth,mycall,hiscall,hisgrid,nexp_decode, & sync2,a,dtx,nft,qual,nhist,nsmo,decoded) call timer('decod65a',1) if(nft.eq.1) nsum=1 ! ncandidates=param(0) nhard_min=param(1) ! nsoft_min=param(2) ! nera_best=param(3) nrtt1000=param(4) ntotal_min=param(5) ! ntry=param(6) ! nq1000=param(7) ! npp1=param(8) nsmo=param(9) nfreq=nint(freq+a(1)) ndrift=nint(2.0*a(2)) s2db=10.0*log10(sync2) - 35 !### empirical ### nsnr=nint(s2db) if(nsnr.lt.-30) nsnr=-30 if(nsnr.gt.-1) nsnr=-1 if(nft.ne.1 .and. ndepth.ge.4 .and. (.not.prtavg)) then ! Single-sequence FT decode failed, so try for an average FT decode. if(nutc.ne.nutc0 .or. abs(nfreq-nfreq0).gt.ntol) then ! This is a new minute or a new frequency, so call avg65. nutc0=nutc nfreq0=nfreq nsave=nsave+1 nsave=mod(nsave-1,64)+1 call avg65(nutc,nsave,sync1,dtx,nflip,nfreq,mode65,ntol, & ndepth,ntrials,naggressive,nclearave,neme,mycall, & hiscall,hisgrid,nftt,avemsg,qave,deepave,nsum,ndeepave) if (associated(this%callback) .and. nsum.ge.2) then call this%callback(nutc,sync1,nsnr,dtx-1.0,nfreq,ndrift, & avemsg,nftt,nqual,nsmo,nsum,minsync,nsubmode, & naggressive) prtavg=.true. cycle end if endif endif if(nftt.eq.1) then nft=1 decoded=avemsg go to 5 endif n=naggressive rtt=0.001*nrtt1000 if(nft.lt.2 .and. minsync.ge.0) then if(nhard_min.gt.50) cycle if(nhard_min.gt.h0(n)) cycle if(ntotal_min.gt.d0(n)) cycle if(rtt.gt.r0(n)) cycle endif 5 if(decoded.eq.decoded0 .and. abs(freq-freq0).lt. 3.0 .and. & minsync.ge.0) cycle !Don't display dupes if(decoded.ne.' ' .or. minsync.lt.0) then if( nsubtract .eq. 1 ) then call timer('subtr65 ',0) call subtract65(dd,npts,freq,dtx) call timer('subtr65 ',1) endif ndupe=0 ! de-dedupe do i=1, ndecoded if(decoded==dec(i)%decoded) then ndupe=1 exit endif enddo if(ndupe.ne.1 .or. minsync.lt.0) then if(ipass.eq.1) n65a=n65a + 1 if(ipass.eq.2) n65b=n65b + 1 ndecoded=ndecoded+1 dec(ndecoded)%freq=freq+a(1) dec(ndecoded)%dt=dtx dec(ndecoded)%sync=sync2 dec(ndecoded)%decoded=decoded nqual=min(qual,9999.0) if (associated(this%callback)) then call this%callback(nutc,sync1,nsnr,dtx-1.0,nfreq,ndrift, & decoded,nft,nqual,nsmo,nsum,minsync,nsubmode, & naggressive) end if endif decoded0=decoded freq0=freq if(decoded0.eq.' ') decoded0='*' endif enddo !Candidate loop if(ndecoded.lt.1) exit enddo !Two-pass loop return end subroutine decode subroutine avg65(nutc,nsave,snrsync,dtxx,nflip,nfreq,mode65,ntol,ndepth, & ntrials,naggressive,nclearave,neme,mycall,hiscall,hisgrid,nftt, & avemsg,qave,deepave,nsum,ndeepave) ! Decodes averaged JT65 data use jt65_mod parameter (MAXAVE=64) character*22 avemsg,deepave,deepbest character mycall*12,hiscall*12,hisgrid*6 character*1 csync,cused(64) integer iused(64) ! Accumulated data for message averaging integer iutc(MAXAVE) integer nfsave(MAXAVE) integer listutc(10) integer nflipsave(MAXAVE) ! real s1b(-255:256,126) ! real s1save(-255:256,126,MAXAVE) real s3save(64,63,MAXAVE) real s3b(64,63) real dtsave(MAXAVE) real syncsave(MAXAVE) logical first data first/.true./ save if(first .or. (nclearave.eq.1)) then iutc=-1 nfsave=0 dtdiff=0.2 first=.false. s3b=0. nsave=1 !### ??? endif nclearave=0 do i=1,64 if(nutc.eq.iutc(i) .and. abs(nhz-nfsave(i)).le.ntol) go to 10 enddo ! Save data for message averaging iutc(nsave)=nutc syncsave(nsave)=snrsync dtsave(nsave)=dtxx nfsave(nsave)=nfreq nflipsave(nsave)=nflip ! s1save(-255:256,1:126,nsave)=s1 s3save(1:64,1:63,nsave)=s3a 10 syncsum=0. dtsum=0. nfsum=0 nsum=0 s3b=0. do i=1,64 !Consider all saved spectra cused(i)='.' if(iutc(i).lt.0) cycle if(mod(iutc(i),2).ne.mod(nutc,2)) cycle !Use only same (odd/even) seq if(abs(dtxx-dtsave(i)).gt.dtdiff) cycle !DT must match if(abs(nfreq-nfsave(i)).gt.ntol) cycle !Freq must match if(nflip.ne.nflipsave(i)) cycle !Sync type (*/#) must match s3b=s3b + s3save(1:64,1:63,i) syncsum=syncsum + syncsave(i) dtsum=dtsum + dtsave(i) nfsum=nfsum + nfsave(i) cused(i)='$' nsum=nsum+1 iused(nsum)=i enddo if(nsum.lt.64) iused(nsum+1)=0 syncave=0. dtave=0. fave=0. if(nsum.gt.0) then syncave=syncsum/nsum dtave=dtsum/nsum fave=float(nfsum)/nsum endif do i=1,nsave csync='*' if(nflipsave(i).lt.0.0) csync='#' write(14,1000) cused(i),iutc(i),syncsave(i),dtsave(i),nfsave(i),csync 1000 format(a1,i5.4,f6.1,f6.2,i6,1x,a1) enddo if(nsum.lt.2) go to 900 rewind 62 sqt=0. sqf=0. do j=1,64 i=iused(j) if(i.eq.0) exit csync='*' if(nflipsave(i).lt.0) csync='#' write(62,3001) i,iutc(i),syncsave(i),dtsave(i),nfsave(i),csync 3001 format(i3,i6.4,f6.1,f6.2,i6,1x,a1) sqt=sqt + (dtsave(i)-dtave)**2 sqf=sqf + (nfsave(i)-fave)**2 enddo rmst=0. rmsf=0. if(nsum.ge.2) then rmst=sqrt(sqt/(nsum-1)) rmsf=sqrt(sqf/(nsum-1)) endif write(62,3002) 3002 format(16x,'----- -----') write(62,3003) dtave,nint(fave) write(62,3003) rmst,nint(rmsf) 3003 format(15x,f6.2,i6) flush(62) nadd=nsum*mode65 nftt=0 ! nexp_decode=0 !### not used, anyway call extract(s3b,nadd,mode65,ntrials,naggressive,ndepth,mycall, & hiscall,hisgrid,nexp_decode,ncount,nhist,avemsg,ltext,nftt,qual) 900 continue return end subroutine avg65 end module jt65_decode