mirror of https://github.com/saitohirga/WSJT-X.git
225 lines
6.5 KiB
Fortran
225 lines
6.5 KiB
Fortran
subroutine symspec(k,nxpol,ndiskdat,nb,nbslider,idphi,nfsample, &
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fgreen,iqadjust,iqapply,gainx,gainy,phasex,phasey,rejectx,rejecty, &
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pxdb,pydb,ssz5a,nkhz,ihsym,nzap,slimit,lstrong)
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! k pointer to the most recent new data
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! nxpol 0/1 to indicate single- or dual-polarization
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! ndiskdat 0/1 to indicate if data from disk
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! nb 0/1 status of noise blanker
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! idphi Phase correction for Y channel, degrees
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! nfsample sample rate (Hz)
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! fgreen Frequency of green marker in I/Q calibrate mode (-48.0 to +48.0 kHz)
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! iqadjust 0/1 to indicate whether IQ adjustment is active
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! iqapply 0/1 to indicate whether to apply I/Q calibration
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! pxdb power in x channel (0-60 dB)
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! pydb power in y channel (0-60 dB)
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! ssz5a polarized spectrum, for waterfall display
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! nkhz integer kHz portion of center frequency, e.g., 125 for 144.125
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! ihsym index number of this half-symbol (1-322)
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! nzap number of samples zero'ed by noise blanker
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include 'njunk.f90'
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parameter (NSMAX=60*96000) !Total sample intervals per minute
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parameter (NFFT=32768) !Length of FFTs
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real*8 ts,hsym
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real*8 fcenter
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common/datcom/dd(4,5760000),ss(4,322,NFFT),savg(4,NFFT),fcenter,nutc, &
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junk(NJUNK)
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real*4 ssz5a(NFFT),w(NFFT),w2a(NFFT),w2b(NFFT)
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complex z,zfac
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complex zsumx,zsumy
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complex cx(NFFT),cy(NFFT)
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complex cx00(NFFT),cy00(NFFT)
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complex cx0(0:1023),cx1(0:1023)
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complex cy0(0:1023),cy1(0:1023)
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logical*1 lstrong(0:1023)
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data rms/999.0/,k0/99999999/,nadjx/0/,nadjy/0/
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save
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nfast=1
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if(k.gt.5751000) go to 999
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if(k.lt.NFFT) then
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ihsym=0
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go to 999 !Wait for enough samples to start
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endif
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if(k0.eq.99999999) then
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pi=4.0*atan(1.0)
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w2a=0.
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w2b=0.
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do i=1,NFFT
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w(i)=(sin(i*pi/NFFT))**2 !Window for nfast=1
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if(i.lt.17833) w2a(i)=(sin(i*pi/17832.925))**2 !Window a for nfast=2
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j=i-8916
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if(j.gt.0 .and. j.lt.17833) w2b(i)=(sin(j*pi/17832.925))**2 ! b
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enddo
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w2a=sqrt(2.0)*w2a
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w2b=sqrt(2.0)*w2b
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endif
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hsym=2048.d0*96000.d0/11025.d0 !Samples per JT65 half-symbol
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if(nfsample.eq.95238) hsym=2048.d0*95238.1d0/11025.d0
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if(k.lt.k0) then
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ts=1.d0 - hsym
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savg=0.
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ihsym=0
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k1=0
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if(ndiskdat.eq.0) dd(1:4,k+1:5760000)=0. !### Should not be needed ??? ###
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endif
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k0=k
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nzap=0
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sigmas=1.5*(10.0**(0.01*nbslider)) + 0.7
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peaklimit=sigmas*max(10.0,rms)
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faclim=3.0
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px=0.
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py=0.
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iqapply0=0
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iqadjust0=0
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if(iqadjust.ne.0) iqapply0=0
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nwindow=2
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! nwindow=0 !### No windowing ###
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nfft2=1024
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kstep=nfft2
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if(nwindow.ne.0) kstep=nfft2/2
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nblks=(k-k1)/kstep
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do nblk=1,nblks
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j=k1+1
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do i=0,nfft2-1
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cx0(i)=cmplx(dd(1,j+i),dd(2,j+i))
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if(nxpol.ne.0) cy0(i)=cmplx(dd(3,j+i),dd(4,j+i))
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enddo
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call timf2(k,nxpol,nfft2,nwindow,nb,peaklimit,iqadjust0,iqapply0, &
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faclim,cx0,cy0,gainx,gainy,phasex,phasey,cx1,cy1,slimit,lstrong, &
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px,py,nzap)
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do i=0,kstep-1
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dd(1,j+i)=real(cx1(i))
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dd(2,j+i)=aimag(cx1(i))
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if(nxpol.ne.0) then
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dd(3,j+i)=real(cy1(i))
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dd(4,j+i)=aimag(cy1(i))
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endif
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enddo
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k1=k1+kstep
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enddo
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npts=NFFT !Samples used in each half-symbol FFT
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ts=ts+hsym
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ja=ts !Index of first sample
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jb=ja+npts-1 !Last sample
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i=0
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fac=0.0002
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dphi=idphi/57.2957795
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zfac=fac*cmplx(cos(dphi),sin(dphi))
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do j=ja,jb !Copy data into cx, cy
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x1=dd(1,j)
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x2=dd(2,j)
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if(nxpol.ne.0) then
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x3=dd(3,j)
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x4=dd(4,j)
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else
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x3=0.
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x4=0.
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endif
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i=i+1
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cx(i)=fac*cmplx(x1,x2)
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cy(i)=zfac*cmplx(x3,x4) !NB: cy includes dphi correction
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enddo
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if(nzap/178.lt.50 .and. (ndiskdat.eq.0 .or. ihsym.lt.280)) then
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nsum=nblks*kstep - nzap
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if(nsum.le.0) nsum=1
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rmsx=sqrt(0.5*px/nsum)
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rmsy=sqrt(0.5*py/nsum)
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rms=rmsx
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if(nxpol.ne.0) rms=sqrt((px+py)/(4.0*nsum))
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endif
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pxdb=0.
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pydb=0.
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if(rmsx.gt.1.0) pxdb=20.0*log10(rmsx)
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if(rmsy.gt.1.0) pydb=20.0*log10(rmsy)
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if(pxdb.gt.60.0) pxdb=60.0
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if(pydb.gt.60.0) pydb=60.0
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cx00=cx
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if(nxpol.ne.0) cy00=cy
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do mm=1,nfast
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ihsym=ihsym+1
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if(nfast.eq.1) then
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cx=w*cx00 !Apply window for 2nd forward FFT
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if(nxpol.ne.0) cy=w*cy00
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else
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if(mm.eq.1) then
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cx=w2a*cx00
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if(nxpol.ne.0) cy=w2a*cy00
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else
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cx=w2b*cx00
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if(nxpol.ne.0) cy=w2b*cy00
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endif
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endif
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call four2a(cx,NFFT,1,1,1) !Second forward FFT (X)
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if(iqadjust.eq.0) nadjx=0
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if(iqadjust.ne.0 .and. nadjx.lt.50) call iqcal(nadjx,cx,NFFT, &
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gainx,phasex,zsumx,ipkx,rejectx0)
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if(iqapply.ne.0) call iqfix(cx,NFFT,gainx,phasex)
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if(nxpol.ne.0) then
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call four2a(cy,NFFT,1,1,1) !Second forward FFT (Y)
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if(iqadjust.eq.0) nadjy=0
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if(iqadjust.ne.0 .and. nadjy.lt.50) call iqcal(nadjy,cy,NFFT, &
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gainy,phasey,zsumy,ipky,rejecty)
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if(iqapply.ne.0) call iqfix(cy,NFFT,gainy,phasey)
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endif
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n=min(322,ihsym)
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do i=1,NFFT
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sx=real(cx(i))**2 + aimag(cx(i))**2
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ss(1,n,i)=sx ! Pol = 0
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savg(1,i)=savg(1,i) + sx
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if(nxpol.ne.0) then
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z=cx(i) + cy(i)
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s45=0.5*(real(z)**2 + aimag(z)**2)
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ss(2,n,i)=s45 ! Pol = 45
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savg(2,i)=savg(2,i) + s45
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sy=real(cy(i))**2 + aimag(cy(i))**2
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ss(3,n,i)=sy ! Pol = 90
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savg(3,i)=savg(3,i) + sy
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z=cx(i) - cy(i)
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s135=0.5*(real(z)**2 + aimag(z)**2)
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ss(4,n,i)=s135 ! Pol = 135
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savg(4,i)=savg(4,i) + s135
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z=cx(i)*conjg(cy(i))
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q=sx - sy
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u=2.0*real(z)
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ssz5a(i)=0.707*sqrt(q*q + u*u) !Spectrum of linear polarization
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! Leif's formula:
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! ssz5a(i)=0.5*(sx+sy) + (real(z)**2 + aimag(z)**2 - sx*sy)/(sx+sy)
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else
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ssz5a(i)=sx
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endif
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enddo
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enddo
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if(ihsym.eq.278) then
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if(iqadjust.ne.0 .and. ipkx.ne.0 .and. ipky.ne.0) then
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rejectx=10.0*log10(savg(1,1+nfft-ipkx)/savg(1,1+ipkx))
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rejecty=10.0*log10(savg(3,1+nfft-ipky)/savg(3,1+ipky))
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endif
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endif
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nkhz=nint(1000.d0*(fcenter-int(fcenter)))
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if(fcenter.eq.0.d0) nkhz=125
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999 return
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end subroutine symspec
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