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146 lines
4.3 KiB
Fortran
146 lines
4.3 KiB
Fortran
subroutine q65_loops(c00,nutc,npts2,nsps,mode,mode64,nsubmode,nFadingModel, &
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ndepth,jpk0,xdt0,f0,width,iaptype,APmask,APsymbols,snr1,xdt1,f1, &
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snr2,irc,dat4)
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use packjt77
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use timer_module, only: timer
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parameter (LN=2176*63) !LN=LL*NN; LL = 64*(mode64+2)
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character*37 decoded
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character*77 c77
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complex c00(0:npts2-1) !Analytic representation of dd(), 6000 Hz
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complex ,allocatable :: c0(:) !Ditto, with freq shift
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real a(3) !twkfreq params f,f1,f2
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real s3(LN) !Symbol spectra
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real s3avg(LN) !Averaged symbol spectra
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real s3prob(LN) !Symbol-value probabilities
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logical unpk77_success
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integer APmask(13)
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integer APsymbols(13)
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integer dat4(13) !Decoded message (as 13 six-bit integers)
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integer nap(0:11) !AP return codes
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data nap/0,2,3,2,3,4,2,3,6,4,6,6/,nsave/0/
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save nsave,s3avg
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ircbest=9999
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allocate(c0(0:npts2-1))
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irc=-99
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s3lim=20.
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idfmax=3
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idtmax=3
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ibwmin=1
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ibwmax=2
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maxdist=15
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if(ndepth.ge.2) then
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idfmax=5
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idtmax=5
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maxdist=25
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endif
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if(ndepth.eq.3) then
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ibwmax=5
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endif
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LL=64*(mode64+2)
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NN=63
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napmin=99
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baud=6000.0/nsps
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xdt1=xdt0
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f1=f0
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maxavg=0
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if(iand(ndepth,16).ne.0) maxavg=1
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do iavg=0,maxavg
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if(iavg.eq.1) then
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idfmax=1
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idtmax=1
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endif
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do idf=1,idfmax
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ndf=idf/2
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if(mod(idf,2).eq.0) ndf=-ndf
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a=0.
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a(1)=-(f0+0.5*baud*ndf)
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call twkfreq(c00,c0,npts2,6000.0,a)
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do idt=1,idtmax
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ndt=idt/2
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if(iaptype.eq.0 .and. iavg.eq.0) then
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if(mod(idt,2).eq.0) ndt=-ndt
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jpk=jpk0 + nsps*ndt/16 !tsym/16
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if(jpk.lt.0) jpk=0
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call timer('spec64 ',0)
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call spec64(c0,nsps,mode,mode64,jpk,s3,LL,NN)
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call timer('spec64 ',1)
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call pctile(s3,LL*NN,40,base)
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s3=s3/base
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where(s3(1:LL*NN)>s3lim) s3(1:LL*NN)=s3lim
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endif
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if(iavg.eq.1) then
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s3(1:LL*NN)=s3avg(1:LL*NN)
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endif
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do ibw=ibwmin,ibwmax
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nbw=ibw
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ndist=ndf**2 + ndt**2 + ((nbw-2))**2
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if(ndist.gt.maxdist) cycle
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! b90=1.728**ibw
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b90=3.0**nbw
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if(b90.gt.230.0) cycle
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! if(b90.lt.0.15*width) exit
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call timer('q65_intr',0)
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call q65_intrinsics_ff(s3,nsubmode,b90,nFadingModel,s3prob)
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call timer('q65_intr',1)
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call timer('q65_dec ',0)
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call q65_dec(s3,s3prob,APmask,APsymbols,esnodb,dat4,irc)
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call timer('q65_dec ',1)
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if(irc.ge.0) go to 100
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! irc > 0 ==> number of iterations required to decode
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! -1 = invalid params
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! -2 = decode failed
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! -3 = CRC mismatch
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enddo ! ibw (b90 loop)
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enddo ! idt (DT loop)
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enddo ! idf (f0 loop)
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if(iaptype.eq.0 .and. iavg.eq.0) then
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a=0.
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a(1)=-f0
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call twkfreq(c00,c0,npts2,6000.0,a)
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jpk=3000 !### Are these definitions OK?
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if(nsps.ge.3600) jpk=6000 !### TR >= 60 s
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call spec64(c0,nsps,mode,mode64,jpk,s3,LL,NN)
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call pctile(s3,LL*NN,40,base)
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s3=s3/base
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where(s3(1:LL*NN)>s3lim) s3(1:LL*NN)=s3lim
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s3avg(1:LL*NN)=s3avg(1:LL*NN)+s3(1:LL*NN)
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nsave=nsave+1
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endif
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if(iavg.eq.0 .and. nsave.lt.2) exit
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enddo ! iavg
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100 if(irc.ge.0) then
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navg=nsave
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snr2=esnodb - db(2500.0/baud)
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if(iavg.eq.0) navg=0
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xdt1=xdt0 + nsps*ndt/(16.0*6000.0)
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f1=f0 + 0.5*baud*ndf
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!### For tests only:
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open(53,file='fort.53',status='unknown',position='append')
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write(c77,1100) dat4(1:12),dat4(13)/2
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1100 format(12b6.6,b5.5)
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call unpack77(c77,0,decoded,unpk77_success) !Unpack to get msgsent
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m=nutc
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if(nsps.ge.3600) m=100*m
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ihr=m/10000
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imin=mod(m/100,100)
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isec=mod(m,100)
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hours=ihr + imin/60.0 + isec/3600.0
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write(53,3053) m,hours,ndf,ndt,nbw,ndist,irc,iaptype,navg,snr1, &
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xdt1,f1,snr2,trim(decoded)
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3053 format(i6.6,f8.4,4i3,i4,2i3,f6.1,f6.2,f7.1,f6.1,1x,a)
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close(53)
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!###
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nsave=0
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s3avg=0.
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irc=irc + 100*navg
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endif
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return
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end subroutine q65_loops
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