WSJT-X/lib/hint65.f90

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Fortran
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subroutine hint65(s3,mrs,mrs2,mrsym,mr2sym,mrprob,nadd,flip, &
mycall,hiscall,hisgrid,nexp_decode,qual,decoded)
use packjt
use prog_args
parameter (MAXCALLS=10000,MAXRPT=63)
parameter (MAXMSG=2*MAXCALLS + 2 + MAXRPT)
real s3(64,63)
integer*1 sym1(0:62,MAXMSG)
integer*1 sym2(0:62,MAXMSG)
integer mrs(63),mrs2(63)
integer mrsym(0:62),mr2sym(0:62),mrprob(0:62)
integer dgen(12),sym(0:62),sym_rev(0:62)
character*6 mycall,hiscall,hisgrid,call2(MAXCALLS)
character*4 grid2(MAXCALLS),rpt(MAXRPT)
character callsign*12,grid*4
character*180 line
character ceme*3,msg*22,msg00*22
character*22 msg0(MAXMSG),decoded
logical*1 eme(MAXCALLS)
logical first
data first/.true./
data rpt/'-01','-02','-03','-04','-05', &
'-06','-07','-08','-09','-10', &
'-11','-12','-13','-14','-15', &
'-16','-17','-18','-19','-20', &
'-21','-22','-23','-24','-25', &
'-26','-27','-28','-29','-30', &
'R-01','R-02','R-03','R-04','R-05', &
'R-06','R-07','R-08','R-09','R-10', &
'R-11','R-12','R-13','R-14','R-15', &
'R-16','R-17','R-18','R-19','R-20', &
'R-21','R-22','R-23','R-24','R-25', &
'R-26','R-27','R-28','R-29','R-30', &
'RO','RRR','73'/
save first,sym1,nused,msg0,sym2
first=.true. !### For now, at least: always recompute hypothetical messages
if(first) then
neme=0
open(23,file=trim(data_dir)//'/CALL3.TXT',status='unknown')
icall=0
j=0
do i=1,MAXCALLS
read(23,1002,end=10) line
1002 format(a80)
if(line(1:4).eq.'ZZZZ') cycle
if(line(1:2).eq.'//') cycle
i1=index(line,',')
if(i1.lt.4) cycle
i2=index(line(i1+1:),',')
if(i2.lt.5) cycle
i2=i2+i1
i3=index(line(i2+1:),',')
if(i3.lt.1) i3=index(line(i2+1:),' ')
i3=i2+i3
callsign=line(1:i1-1)
grid=line(i1+1:i2-1)
ceme=line(i2+1:i3-1)
eme(i)=ceme.eq.'EME'
if(neme.eq.1 .and. (.not.eme(i))) cycle
if(callsign(1:6).eq.hiscall .and. grid.eq.hisgrid) cycle
j=j+1
call2(j)=callsign(1:6) !### Fix for compound callsigns!
grid2(j)=grid
enddo
10 ncalls=j
if(ncalls.lt.10) stop 'CALL3.TXT very short or missing?'
close(23)
! NB: generation of test messages is not yet complete!
j=0
do i=-1,ncalls
if(i.eq.0 .and. hiscall.eq.' ' .and. hisgrid.eq.' ') cycle
mz=2
if(i.eq.-1) mz=1
if(i.eq.0) mz=65
do m=1,mz
j=j+1
if(i.eq.-1) then
msg='0123456789ABC'
else if(i.eq.0) then
if(m.eq.1) msg=mycall//' '//hiscall//' '//hisgrid(1:4)
if(m.eq.2) msg='CQ '//hiscall//' '//hisgrid(1:4)
if(m.ge.3) msg=mycall//' '//hiscall//' '//rpt(m-2)
else
if(m.eq.1) msg=mycall//' '//call2(i)//' '//grid2(i)
if(m.eq.2) msg='CQ '//call2(i)//' '//grid2(i)
endif
call fmtmsg(msg,iz)
call packmsg(msg,dgen,itype) !Pack message into 72 bits
call rs_encode(dgen,sym_rev) !RS encode
sym(0:62)=sym_rev(62:0:-1)
sym1(0:62,j)=sym
call interleave63(sym_rev,1) !Interleave channel symbols
call graycode(sym_rev,63,1,sym_rev) !Apply Gray code
sym2(0:62,j)=sym_rev(0:62)
msg0(j)=msg
enddo
enddo
nused=j
first=.false.
endif
ref0=0.
do j=1,63
ref0=ref0 + s3(mrs(j)+1,j)
enddo
u1=0.
u1=-99.0
u2=u1
! dtotal=199.0
! Find u1 and u2 (best and second-best) codeword from a list, using
! a bank of matched filters on the symbol spectra s3(i,j).
ipk=1
ipk2=0
msg00=' '
do k=1,nused
if(k.ge.2 .and. k.le.64 .and. flip.lt.0.0) cycle
! Test all messages if flip=+1; skip the CQ messages if flip=-1.
if(flip.gt.0.0 .or. msg0(k)(1:3).ne.'CQ ') then
psum=0.
ref=ref0
do j=1,63
i=sym2(j-1,k)+1
psum=psum + s3(i,j)
if(i.eq.mrs(j)+1) ref=ref - s3(i,j) + s3(mrs2(j)+1,j)
enddo
p=psum/ref
if(p.gt.u1) then
if(msg0(k).ne.msg00) then
ipk2=ipk
u2=u1
endif
u1=p
ipk=k
msg00=msg0(k)
endif
if(msg0(k).ne.msg00 .and. p.gt.u2) then
u2=p
ipk2=k
endif
endif
! write(91,3401) k,p,u1,u2,ipk,ipk2,msg0(k)
!3401 format(i6,3f9.3,2i6,2x,a22)
enddo
!### Just in case ???
rewind 77
write(77,*) u1,u2,ipk,ipk2
call flush(77)
!###
decoded=' '
bias=max(1.12*u2,0.35)
if(nadd.ge.4) bias=max(1.08*u2,0.45)
if(nadd.ge.8) bias=max(1.04*u2,0.60)
qual=100.0*(u1-bias)
! write(*,3301) u1,u2,u1/u2,bias,qual,nadd,ipk,ipk2
!3301 format(5f6.2,i3,2i6)
qmin=1.0
if(qual.ge.qmin) decoded=msg0(ipk)
return
end subroutine hint65