mirror of https://github.com/saitohirga/WSJT-X.git
136 lines
4.1 KiB
Fortran
136 lines
4.1 KiB
Fortran
subroutine q65b(nutc,fcenter,nfcal,nfsample,ikhz,mousedf,ntol,xpol, &
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mycall0,hiscall0,hisgrid,mode_q65)
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use q65_decode
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use wideband_sync
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use timer_module, only: timer
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parameter (MAXFFT1=5376000) !56*96000
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parameter (MAXFFT2=336000) !56*6000 (downsampled by 1/16)
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parameter (NMAX=60*12000)
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integer*2 iwave(60*12000)
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complex ca(MAXFFT1),cb(MAXFFT1) !FFTs of raw x,y data
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complex cx(0:MAXFFT2-1),cy(0:MAXFFT2-1),cz(0:MAXFFT2)
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logical xpol
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integer ipk1(1)
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real*8 fcenter,freq0
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character*12 mycall0,hiscall0
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character*12 mycall,hiscall
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character*6 hisgrid
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character*4 grid4
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character*80 line
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character*80 wsjtx_dir
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common/cacb/ca,cb
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save
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open(9,file='wsjtx_dir.txt',status='old')
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read(9,'(a)') wsjtx_dir
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close(9)
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if(mycall0(1:1).ne.' ') mycall=mycall0
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if(hiscall0(1:1).ne.' ') hiscall=hiscall0
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if(hisgrid(1:4).ne.' ') grid4=hisgrid(1:4)
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! Find best frequency and ipol from sync_dat, the "orange sync curve".
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ff=ikhz+0.001*(mousedf+1270.459) !supposed freq of sync tone
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ifreq=nint(1000.0*(ff-nkhz_center+48)*32768.0/96000.0) !Freq index into ss(4,322,32768)
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dff=96000.0/32768.0
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ia=nint(ifreq-ntol/dff)
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ib=nint(ifreq+ntol/dff)
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ipk1=maxloc(sync_dat(ia:ib,2))
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ipk=ia+ipk1(1)-1
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ipol=1
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if(xpol) ipol=nint(sync_dat(ipk,4))
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nhz=nint((ipk-ifreq)*dff)
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nfft1=MAXFFT1
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nfft2=MAXFFT2
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df=96000.0/NFFT1
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if(nfsample.eq.95238) then
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nfft1=5120000
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nfft2=322560
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df=96000.0/nfft1
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endif
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nh=nfft2/2
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ikhz0=nint(1000.0*(fcenter-int(fcenter)))
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k0=((ikhz-ikhz0+48.0+0.270)*1000.0+nfcal+mousedf+nhz)/df !0.270 = 1.270-1.000
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if(k0.lt.nh .or. k0.gt.nfft1-nh) go to 900
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fac=1.0/nfft2
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cx(0:nh)=ca(k0:k0+nh)
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cx(nh+1:nfft2-1)=ca(k0-nh+1:k0-1)
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cx=fac*cx
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if(xpol) then
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cy(0:nh)=cb(k0:k0+nh)
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cy(nh+1:nfft2-1)=cb(k0-nh+1:k0-1)
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cy=fac*cy
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endif
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! Here cx and cy (if xpol) are frequency-domain data around the selected
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! QSO frequency, taken from the full-length FFT computed in filbig().
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! Values for fsample, nfft1, nfft2, df, and the downsampled data rate
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! are as follows:
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! fSample nfft1 df nfft2 fDownSampled
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! (Hz) (Hz) (Hz)
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!----------------------------------------------------
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! 96000 5376000 0.017857143 336000 6000.000
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! 95238 5120000 0.018601172 322560 5999.994
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if(ipol.eq.1) cz(0:MAXFFT2-1)=cx
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if(ipol.eq.2) cz(0:MAXFFT2-1)=0.707*(cx+cy)
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if(ipol.eq.3) cz(0:MAXFFT2-1)=cy
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if(ipol.eq.4) cz(0:MAXFFT2-1)=0.707*(cx-cy)
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cz(MAXFFT2)=0.
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!Transform to time domain (real), fsample=12000 Hz
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call four2a(cz,2*nfft2,1,1,-1)
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do i=0,nfft2-1
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j=nfft2-1-i
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iwave(2*i+1)=nint(real(cz(j)))
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iwave(2*i+2)=nint(aimag(cz(j)))
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enddo
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iwave(2*nfft2+1:)=0
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nsubmode=mode_q65-1
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nfa=max(100,1000-ntol)
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nfb=min(4900,1000+ntol)
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newdat=1
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nagain=0
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nsnr0=-99 !Default snr for no decode
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call timer('mmdec ',0)
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call map65_mmdec(nutc,iwave,nsubmode,nfa,nfb,1000+mousedf,ntol,newdat,nagain, &
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mycall,hiscall,hisgrid)
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call timer('mmdec ',1)
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nfreq=nfreq0 + nhz + mousedf - 1000
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freq0=144.0 + 0.001*ikhz
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if(nsnr0.gt.-99) then
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! write(71,3071) mousedf,ntol,ia,ib,ifreq,ipk,ikhz,nfreq,nsnr0,xdt0,freq0,trim(msg0)
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!3071 format(9i6,f6.2,f9.3,1x,a)
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! write(72,3072) mousedf,nfa,nfb,nfreq,ifreq,ipk,ipk-ifreq,nhz,(ipk-ifreq)*dff
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!3072 format(8i6,f7.1)
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write(line,1020) ikhz,nfreq,45*(ipol-1),nutc,xdt0,nsnr0,msg0(1:27),cq0
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1020 format('!',i3.3,i5,i4,i6.4,f5.1,i5,' : ',a27,a3)
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write(*,1100) trim(line)
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1100 format(a)
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! Should write to lu 26 here, for Messages and Band Map windows ?
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! write(26,1014) freq0,nfreq0,0,0,0,xdt0,ipol0,0, &
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! nsnr0,nutc,msg40(1:22),' ',char(ichar('A') + mode_q65-1)
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!1014 format(f8.3,i5,3i3,f5.1,i4,i3,i4,i5.4,4x,a22,2x,a1,3x,':',a1)
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! Write to file map65_rx.log:
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write(21,1110) freq0,nfreq,xdt0,45*(ipol-1),nsnr0,nutc,msg0(1:28),cq0
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1110 format(f8.3,i5,f5.1,2i4,i5.4,2x,a28,': A',2x,a3)
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endif
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900 close(13)
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close(17)
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write(*,1900)
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1900 format('<DecodeFinished>')
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call flush(6)
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return
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end subroutine q65b
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