module jt65_decode integer, parameter :: NSZ=3413, NZMAX=60*12000 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,sync,snr,dt,freq,drift, & nflip,width,decoded,ft,qual,nsmo,nsum,minsync) import jt65_decoder implicit none class(jt65_decoder), intent(inout) :: this real, intent(in) :: sync integer, intent(in) :: snr real, intent(in) :: dt integer, intent(in) :: freq integer, intent(in) :: drift integer, intent(in) :: nflip real, intent(in) :: width 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 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,clearave,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, clearave 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 real flip 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,prtavg,single_decode,bVHF 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 dd=dd0 ndecoded=0 if(nsubmode.ge.100) then ! This is QRA64 mode mode64=2**(nsubmode-100) call qra64a(dd,npts,nutc,nf1,nf2,nfqso,ntol,mode64,minsync,ndepth, & mycall,hiscall,hisgrid,sync,nsnr,dtx,nfreq,decoded,nft) if (associated(this%callback)) then ndrift=0 nflip=1 width=1.0 nsmo=0 nqual=0 call this%callback(sync,nsnr,dtx,nfreq,ndrift, & nflip,width,decoded,nft,nqual,nsmo,1,minsync) end if go to 900 endif do ipass=1,n2pass !Two-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 bVHF=iand(nexp_decode,64).ne.0 !### Q: should either of the next two uses of "single_decode" be "bVHF" instead? if(single_decode .or. (bVHF .and. ntol.lt.1000)) then nfa=max(200,nfqso-ntol) nfb=min(4000,nfqso+ntol) thresh0=1.0 endif df=12000.0/8192.0 !df = 1.465 Hz if(bVHF) then ia=max(1,nint(nfa/df)-ntol) ib=min(NSZ,nint(nfb/df)+ntol) nz=ib-ia+1 call lorentzian(savg(ia),nz,a) baseline=a(1) amp=a(2) f0=(a(3)+ia-1)*df width=a(4)*df endif ncand=0 call timer('sync65 ',0) call sync65(ss,nfa,nfb,naggressive,ntol,nhsym,ca,ncand,0,bVHF) call timer('sync65 ',1) ! If a candidate was found within +/- ntol of nfqso, move it into ca(1). call fqso_first(nfqso,ntol,ca,ncand) if(single_decode) then if(ncand.eq.0) ncand=1 if(abs(ca(1)%freq - f0).gt.width) width=2*df !### ??? ### endif nvec=ntrials if(ncand.gt.75) then nvec=100 endif mode65=2**nsubmode nflip=1 nqd=0 decoded=' ' decoded0="" freq0=0. prtavg=.false. if(.not.nagain) nsum=0 if(clearave) then nsum=0 nsave=0 endif if(bVHF) then ! Be sure to search for shorthand message at nfqso +/- ntol if(ncand.lt.300) ncand=ncand+1 ca(ncand)%sync=5.0 ca(ncand)%dt=2.5 ca(ncand)%freq=nfqso endif do icand=1,ncand sync1=ca(icand)%sync dtx=ca(icand)%dt freq=ca(icand)%freq if(bVHF) then flip=ca(icand)%flip nflip=flip endif if(sync1.lt.float(minsync)) nflip=0 if(ipass.eq.1) ntry65a=ntry65a + 1 if(ipass.eq.2) ntry65b=ntry65b + 1 call timer('decod65a',0) nft=0 nspecial=0 call decode65a(dd,npts,first_time,nqd,freq,nflip,mode65,nvec, & naggressive,ndepth,ntol,mycall,hiscall,hisgrid, & nexp_decode,bVHF,sync2,a,dtx,nft,nspecial,qual, & nhist,nsmo,decoded) if(nspecial.eq.2) decoded='RO' if(nspecial.eq.3) decoded='RRR' if(nspecial.eq.4) decoded='73' call timer('decod65a',1) if(sync1.lt.float(minsync) .and. & decoded.eq.' ') nflip=0 if(nft.ne.0) nsum=1 nhard_min=param(1) nrtt1000=param(4) ntotal_min=param(5) nsmo=param(9) nfreq=nint(freq+a(1)) ndrift=nint(2.0*a(2)) if(bVHF) then s2db=sync1 - 30.0 + db(width/3.3) !### VHF/UHF/microwave if(nspecial.gt.0) s2db=sync2 else s2db=10.0*log10(sync2) - 35 !### Empirical (HF) endif nsnr=nint(s2db) if(nsnr.lt.-30) nsnr=-30 if(nsnr.gt.-1) nsnr=-1 nftt=0 if(nft.ne.1 .and. iand(ndepth,16).eq.16 .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,nagain,ntrials,naggressive,clearave,neme,mycall, & hiscall,hisgrid,nftt,avemsg,qave,deepave,nsum,ndeepave) nsmo=param(9) nqave=qave if (associated(this%callback) .and. nsum.ge.2) then call this%callback(sync1,nsnr,dtx-1.0,nfreq,ndrift, & nflip,width,avemsg,nftt,nqave,nsmo,nsum,minsync) prtavg=.true. 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 .and. nspecial.eq.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 continue 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 .and. sync1.ge.float(minsync)) then if(ipass.eq.1) n65a=n65a + 1 if(ipass.eq.2) n65b=n65b + 1 if(ndecoded.lt.50) 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(sync1,nsnr,dtx-1.0,nfreq,ndrift, & nflip,width,decoded,nft,nqual,nsmo,1,minsync) end if endif decoded0=decoded freq0=freq if(decoded0.eq.' ') decoded0='*' endif enddo !Candidate loop if(ndecoded.lt.1) exit enddo !Two-pass loop 900 return end subroutine decode subroutine avg65(nutc,nsave,snrsync,dtxx,nflip,nfreq,mode65,ntol,ndepth, & nagain, ntrials,naggressive,clearave,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) logical nagain integer iused(64) ! Accumulated data for message averaging integer iutc(MAXAVE) integer nfsave(MAXAVE) integer nflipsave(MAXAVE) real s1b(-255:256,126) real s1save(-255:256,126,MAXAVE) real s2(66,126) real s3save(64,63,MAXAVE) real s3b(64,63) real s3c(64,63) real dtsave(MAXAVE) real syncsave(MAXAVE) logical first,clearave data first/.true./ save if(first .or. clearave) then iutc=-1 nfsave=0 dtdiff=0.2 first=.false. s3save=0. s1save=0. nsave=1 !### ??? ! Silence compiler warnings if(nagain .and. ndeepave.eq.-99 .and. neme.eq.-99) stop endif do i=1,64 if(iutc(i).lt.0) exit if(nutc.eq.iutc(i) .and. abs(nfreq-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 s1b=0. s3b=0. s3c=0. do i=1,MAXAVE !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) s1b=s1b + s1save(-255:256,1:126,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)-1.0,nfsave(i),csync 1000 format(a1,i5.4,f6.1,f6.2,i6,1x,a1) enddo if(nsum.lt.2) go to 900 nftt=0 df=1378.125/512.0 ! Do the smoothing loop qualbest=0. minsmo=0 maxsmo=0 if(mode65.ge.2) then minsmo=nint(width/df) maxsmo=2*minsmo endif nn=0 do ismo=minsmo,maxsmo if(ismo.gt.0) then do j=1,126 call smo121(s1b(-255,j),512) if(j.eq.1) nn=nn+1 if(nn.ge.4) then call smo121(s1b(-255,j),512) if(j.eq.1) nn=nn+1 endif enddo endif do i=1,66 jj=i if(mode65.eq.2) jj=2*i-1 if(mode65.eq.4) then ff=4*(i-1)*df - 355.297852 jj=nint(ff/df)+1 endif s2(i,1:126)=s1b(jj,1:126) enddo do j=1,63 k=mdat(j) !Points to data symbol if(nflip.lt.0) k=mdat2(j) do i=1,64 s3c(i,j)=4.e-5*s2(i+2,k) enddo enddo nadd=nsum*ismo call extract(s3c,nadd,mode65,ntrials,naggressive,ndepth,nflip,mycall, & hiscall,hisgrid,nexp_decode,ncount,nhist,avemsg,ltext,nftt,qual) if(nftt.eq.1) then nsmo=ismo param(9)=nsmo go to 900 else if(nftt.eq.2) then if(qual.gt.qualbest) then deepbest=avemsg qualbest=qual nnbest=nn nsmobest=ismo nfttbest=nftt endif endif enddo if(nfttbest.eq.2) then avemsg=deepbest !### ??? deepave=deepbest qave=qualbest nsmo=nsmobest param(9)=nsmo nftt=nfttbest endif 900 continue return end subroutine avg65 end module jt65_decode