subroutine symspec(k,nxpol,ndiskdat,nb,nbslider,idphi,nfsample, & fgreen,iqadjust,iqapply,gainx,gainy,phasex,phasey,rejectx,rejecty, & pxdb,pydb,ssz5a,nkhz,ihsym,nzap,slimit,lstrong) ! k pointer to the most recent new data ! nxpol 0/1 to indicate single- or dual-polarization ! ndiskdat 0/1 to indicate if data from disk ! nb 0/1 status of noise blanker ! idphi Phase correction for Y channel, degrees ! nfsample sample rate (Hz) ! fgreen Frequency of green marker in I/Q calibrate mode (-48.0 to +48.0 kHz) ! iqadjust 0/1 to indicate whether IQ adjustment is active ! iqapply 0/1 to indicate whether to apply I/Q calibration ! pxdb power in x channel (0-60 dB) ! pydb power in y channel (0-60 dB) ! ssz5a polarized spectrum, for waterfall display ! nkhz integer kHz portion of center frequency, e.g., 125 for 144.125 ! ihsym index number of this half-symbol (1-322) ! nzap number of samples zero'ed by noise blanker parameter (NSMAX=60*96000) !Total sample intervals per minute parameter (NFFT=32768) !Length of FFTs real*8 ts,hsym real*8 fcenter common/datcom/dd(4,5760000),ss(4,322,NFFT),savg(4,NFFT),fcenter,nutc,junk(36) real*4 ssz5a(NFFT),w(NFFT),w2a(NFFT),w2b(NFFT) complex z,zfac complex zsumx,zsumy complex cx(NFFT),cy(NFFT) complex cx00(NFFT),cy00(NFFT) complex cx0(0:1023),cx1(0:1023) complex cy0(0:1023),cy1(0:1023) logical*1 lstrong(0:1023) data rms/999.0/,k0/99999999/,nadjx/0/,nadjy/0/ save nfast=1 if(k.gt.5751000) go to 999 if(k.lt.NFFT) then ihsym=0 go to 999 !Wait for enough samples to start endif if(k0.eq.99999999) then pi=4.0*atan(1.0) w2a=0. w2b=0. do i=1,NFFT w(i)=(sin(i*pi/NFFT))**2 !Window for nfast=1 if(i.lt.17833) w2a(i)=(sin(i*pi/17832.925))**2 !Window a for nfast=2 j=i-8916 if(j.gt.0 .and. j.lt.17833) w2b(i)=(sin(j*pi/17832.925))**2 ! b enddo w2a=sqrt(2.0)*w2a w2b=sqrt(2.0)*w2b endif hsym=2048.d0*96000.d0/11025.d0 !Samples per JT65 half-symbol if(nfsample.eq.95238) hsym=2048.d0*95238.1d0/11025.d0 if(k.lt.k0) then ts=1.d0 - hsym savg=0. ihsym=0 k1=0 if(ndiskdat.eq.0) dd(1:4,k+1:5760000)=0. !### Should not be needed ??? ### endif k0=k nzap=0 sigmas=1.5*(10.0**(0.01*nbslider)) + 0.7 peaklimit=sigmas*max(10.0,rms) faclim=3.0 px=0. py=0. iqapply0=0 iqadjust0=0 if(iqadjust.ne.0) iqapply0=0 nwindow=2 ! nwindow=0 !### No windowing ### nfft2=1024 kstep=nfft2 if(nwindow.ne.0) kstep=nfft2/2 nblks=(k-k1)/kstep do nblk=1,nblks j=k1+1 do i=0,nfft2-1 cx0(i)=cmplx(dd(1,j+i),dd(2,j+i)) if(nxpol.ne.0) cy0(i)=cmplx(dd(3,j+i),dd(4,j+i)) enddo call timf2(k,nxpol,nfft2,nwindow,nb,peaklimit,iqadjust0,iqapply0, & faclim,cx0,cy0,gainx,gainy,phasex,phasey,cx1,cy1,slimit,lstrong, & px,py,nzap) do i=0,kstep-1 dd(1,j+i)=real(cx1(i)) dd(2,j+i)=aimag(cx1(i)) if(nxpol.ne.0) then dd(3,j+i)=real(cy1(i)) dd(4,j+i)=aimag(cy1(i)) endif enddo k1=k1+kstep enddo npts=NFFT !Samples used in each half-symbol FFT ts=ts+hsym ja=ts !Index of first sample jb=ja+npts-1 !Last sample i=0 fac=0.0002 dphi=idphi/57.2957795 zfac=fac*cmplx(cos(dphi),sin(dphi)) do j=ja,jb !Copy data into cx, cy x1=dd(1,j) x2=dd(2,j) if(nxpol.ne.0) then x3=dd(3,j) x4=dd(4,j) else x3=0. x4=0. endif i=i+1 cx(i)=fac*cmplx(x1,x2) cy(i)=zfac*cmplx(x3,x4) !NB: cy includes dphi correction enddo if(nzap/178.lt.50 .and. (ndiskdat.eq.0 .or. ihsym.lt.280)) then nsum=nblks*kstep - nzap if(nsum.le.0) nsum=1 rmsx=sqrt(0.5*px/nsum) rmsy=sqrt(0.5*py/nsum) rms=rmsx if(nxpol.ne.0) rms=sqrt((px+py)/(4.0*nsum)) endif pxdb=0. pydb=0. if(rmsx.gt.1.0) pxdb=20.0*log10(rmsx) if(rmsy.gt.1.0) pydb=20.0*log10(rmsy) if(pxdb.gt.60.0) pxdb=60.0 if(pydb.gt.60.0) pydb=60.0 cx00=cx if(nxpol.ne.0) cy00=cy do mm=1,nfast ihsym=ihsym+1 if(nfast.eq.1) then cx=w*cx00 !Apply window for 2nd forward FFT if(nxpol.ne.0) cy=w*cy00 else if(mm.eq.1) then cx=w2a*cx00 if(nxpol.ne.0) cy=w2a*cy00 else cx=w2b*cx00 if(nxpol.ne.0) cy=w2b*cy00 endif endif call four2a(cx,NFFT,1,1,1) !Second forward FFT (X) if(iqadjust.eq.0) nadjx=0 if(iqadjust.ne.0 .and. nadjx.lt.50) call iqcal(nadjx,cx,NFFT, & gainx,phasex,zsumx,ipkx,rejectx0) if(iqapply.ne.0) call iqfix(cx,NFFT,gainx,phasex) if(nxpol.ne.0) then call four2a(cy,NFFT,1,1,1) !Second forward FFT (Y) if(iqadjust.eq.0) nadjy=0 if(iqadjust.ne.0 .and. nadjy.lt.50) call iqcal(nadjy,cy,NFFT, & gainy,phasey,zsumy,ipky,rejecty) if(iqapply.ne.0) call iqfix(cy,NFFT,gainy,phasey) endif n=min(322,ihsym) do i=1,NFFT sx=real(cx(i))**2 + aimag(cx(i))**2 ss(1,n,i)=sx ! Pol = 0 savg(1,i)=savg(1,i) + sx if(nxpol.ne.0) then z=cx(i) + cy(i) s45=0.5*(real(z)**2 + aimag(z)**2) ss(2,n,i)=s45 ! Pol = 45 savg(2,i)=savg(2,i) + s45 sy=real(cy(i))**2 + aimag(cy(i))**2 ss(3,n,i)=sy ! Pol = 90 savg(3,i)=savg(3,i) + sy z=cx(i) - cy(i) s135=0.5*(real(z)**2 + aimag(z)**2) ss(4,n,i)=s135 ! Pol = 135 savg(4,i)=savg(4,i) + s135 z=cx(i)*conjg(cy(i)) q=sx - sy u=2.0*real(z) ssz5a(i)=0.707*sqrt(q*q + u*u) !Spectrum of linear polarization ! Leif's formula: ! ssz5a(i)=0.5*(sx+sy) + (real(z)**2 + aimag(z)**2 - sx*sy)/(sx+sy) else ssz5a(i)=sx endif enddo enddo if(ihsym.eq.278) then if(iqadjust.ne.0 .and. ipkx.ne.0 .and. ipky.ne.0) then rejectx=10.0*log10(savg(1,1+nfft-ipkx)/savg(1,1+ipkx)) rejecty=10.0*log10(savg(3,1+nfft-ipky)/savg(3,1+ipky)) endif endif nkhz=nint(1000.d0*(fcenter-int(fcenter))) if(fcenter.eq.0.d0) nkhz=125 999 return end subroutine symspec