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101 lines
2.6 KiB
Fortran
101 lines
2.6 KiB
Fortran
subroutine q65_loops(c00,npts2,nsps2,nsubmode,ndepth,jpk0, &
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xdt0,f0,iaptype,xdt1,f1,snr2,dat4,idec)
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use packjt77
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use timer_module, only: timer
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use q65
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parameter (NN=63)
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parameter (LN=2176*63) !LN=LL*NN; LL=64*(mode_q65+2), NN=63
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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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character decoded*37
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real a(3) !twkfreq params f,f1,f2
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real,allocatable :: s3(:) !Symbol spectra
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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/
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LL=64*(mode_q65+2)
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allocate(s3(LL*NN))
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allocate(c0(0:npts2-1))
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idec=-1
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ircbest=9999
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irc=-99
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s3lim=20.
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baud=6000.0/nsps2
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idfmax=1
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idtmax=1
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maxdist=4
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ibw0=(ibwa+ibwb)/2
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if(iand(ndepth,3).eq.2) then
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idfmax=3
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idtmax=3
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maxdist=5
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endif
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if(iand(ndepth,3).eq.3) then
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idfmax=5
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idtmax=5
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maxdist=15
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endif
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napmin=99
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xdt1=xdt0
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f1=f0
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idfbest=0
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idtbest=0
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ndistbest=0
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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(mod(idt,2).eq.0) ndt=-ndt
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jpk=jpk0 + nsps2*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,nsps2,mode_q65,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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call q65_bzap(s3,LL) !Zap birdies
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do ibw=ibwa,ibwb
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ndist=ndf**2 + ndt**2 + (ibw-ibw0)**2
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if(ndist.gt.maxdist) cycle
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b90=1.72**ibw
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if(b90.gt.345.0) cycle
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b90ts = b90/baud
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call timer('dec2 ',0)
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call q65_dec2(s3,nsubmode,b90ts,esnodb,irc,dat4,decoded)
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call timer('dec2 ',1)
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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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if(irc.ge.0) then
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idfbest=idf
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idtbest=idt
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ndistbest=ndist
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nrc=irc
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go to 100
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endif
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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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100 if(irc.ge.0) then
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idec=iaptype
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snr2=esnodb - db(2500.0/baud)
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xdt1=xdt0 + nsps2*ndt/(16.0*6000.0)
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f1=f0 + 0.5*baud*ndf
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endif
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return
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end subroutine q65_loops
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