167 lines
4.8 KiB
Plaintext
167 lines
4.8 KiB
Plaintext
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subroutine hint65(s3,mrs,mrs2,nadd,nflip,mycall,hiscall,hisgrid,qual,decoded)
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use packjt
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use prog_args
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parameter (MAXCALLS=10000,MAXRPT=63)
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parameter (MAXMSG=2*MAXCALLS + 2 + MAXRPT)
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real s3(64,63)
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integer*1 sym1(0:62,MAXMSG)
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integer*1 sym2(0:62,MAXMSG)
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integer mrs(63),mrs2(63)
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integer dgen(12),sym(0:62),sym_rev(0:62)
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character*6 mycall,hiscall,hisgrid,call2(MAXCALLS)
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character*4 grid2(MAXCALLS),rpt(MAXRPT)
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character callsign*12,grid*4
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character*180 line
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character ceme*3,msg*22,msg00*22
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character*22 msg0(MAXMSG),decoded
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logical*1 eme(MAXCALLS)
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logical first
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data first/.true./
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data rpt/'-01','-02','-03','-04','-05', &
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'-06','-07','-08','-09','-10', &
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'-11','-12','-13','-14','-15', &
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'-16','-17','-18','-19','-20', &
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'-21','-22','-23','-24','-25', &
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'-26','-27','-28','-29','-30', &
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'R-01','R-02','R-03','R-04','R-05', &
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'R-06','R-07','R-08','R-09','R-10', &
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'R-11','R-12','R-13','R-14','R-15', &
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'R-16','R-17','R-18','R-19','R-20', &
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'R-21','R-22','R-23','R-24','R-25', &
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'R-26','R-27','R-28','R-29','R-30', &
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'RO','RRR','73'/
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save first,sym1,nused,msg0,sym2
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first=.true. !### For now, at least: always recompute hypothetical messages
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if(first) then
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neme=0
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open(23,file=trim(data_dir)//'/CALL3.TXT',status='unknown')
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icall=0
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j=0
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do i=1,MAXCALLS
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read(23,1002,end=10) line
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1002 format(a80)
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if(line(1:4).eq.'ZZZZ') cycle
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if(line(1:2).eq.'//') cycle
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i1=index(line,',')
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if(i1.lt.4) cycle
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i2=index(line(i1+1:),',')
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if(i2.lt.5) cycle
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i2=i2+i1
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i3=index(line(i2+1:),',')
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if(i3.lt.1) i3=index(line(i2+1:),' ')
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i3=i2+i3
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callsign=line(1:i1-1)
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grid=line(i1+1:i1+4)
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ceme=line(i2+1:i3-1)
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eme(i)=ceme.eq.'EME'
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if(neme.eq.1 .and. (.not.eme(i))) cycle
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j=j+1
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call2(j)=callsign(1:6) !### Fix for compound callsigns!
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grid2(j)=grid
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enddo
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10 ncalls=j
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if(ncalls.lt.10) then
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write(*,1010) ncalls
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1010 format('CALL3.TXT very short (N =',i2,') or missing?')
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endif
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close(23)
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! NB: generation of test messages is not yet complete!
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j=0
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do i=-1,ncalls
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if(i.eq.0 .and. hiscall.eq.' ' .and. hisgrid(1:4).eq.' ') cycle
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mz=2
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if(i.eq.-1) mz=1
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if(i.eq.0) mz=65
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do m=1,mz
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j=j+1
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if(i.eq.-1) then
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msg='0123456789ABC'
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else if(i.eq.0) then
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if(m.eq.1) msg=mycall//' '//hiscall//' '//hisgrid(1:4)
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if(m.eq.2) msg='CQ '//hiscall//' '//hisgrid(1:4)
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if(m.ge.3) msg=mycall//' '//hiscall//' '//rpt(m-2)
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else
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if(m.eq.1) msg=mycall//' '//call2(i)//' '//grid2(i)
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if(m.eq.2) msg='CQ '//call2(i)//' '//grid2(i)
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endif
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call fmtmsg(msg,iz)
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call packmsg(msg,dgen,itype,.false.) !Pack message into 72 bits
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call rs_encode(dgen,sym_rev) !RS encode
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sym(0:62)=sym_rev(62:0:-1)
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sym1(0:62,j)=sym
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call interleave63(sym_rev,1) !Interleave channel symbols
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call graycode(sym_rev,63,1,sym_rev) !Apply Gray code
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sym2(0:62,j)=sym_rev(0:62)
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msg0(j)=msg
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enddo
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enddo
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nused=j
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first=.false.
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endif
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ref0=0.
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do j=1,63
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ref0=ref0 + s3(mrs(j)+1,j)
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enddo
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u1=0.
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u1=-99.0
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u2=u1
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! Find u1 and u2 (best and second-best) codeword from a list, using
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! a bank of matched filters on the symbol spectra s3(i,j).
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ipk=1
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ipk2=0
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msg00=' '
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do k=1,nused
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if(k.ge.2 .and. k.le.64 .and. nflip.lt.0) cycle
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! Test all messages if nflip=+1; skip the CQ messages if nflip=-1.
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if(nflip.gt.0 .or. msg0(k)(1:3).ne.'CQ ') then
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psum=0.
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ref=ref0
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do j=1,63
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i=sym2(j-1,k)+1
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psum=psum + s3(i,j)
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if(i.eq.mrs(j)+1) ref=ref - s3(i,j) + s3(mrs2(j)+1,j)
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enddo
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p=psum/ref
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if(p.gt.u1) then
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if(msg0(k).ne.msg00) then
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ipk2=ipk
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u2=u1
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endif
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u1=p
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ipk=k
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msg00=msg0(k)
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endif
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if(msg0(k).ne.msg00 .and. p.gt.u2) then
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u2=p
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ipk2=k
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endif
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endif
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enddo
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!### Just in case ???
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! rewind 77
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! write(77,*) u1,u2,ipk,ipk2
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! call flush(77)
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!###
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decoded=' '
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bias=max(1.12*u2,0.35)
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if(nadd.ge.4) bias=max(1.08*u2,0.45)
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if(nadd.ge.8) bias=max(1.04*u2,0.60)
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qual=100.0*(u1-bias)
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! write(*,3301) u1,u2,u1/u2,bias,qual,nadd,ipk,ipk2
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!3301 format(5f6.2,i3,2i6)
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qmin=1.0
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if(qual.ge.qmin) decoded=msg0(ipk)
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return
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end subroutine hint65
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