mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-25 05:38:46 -05:00
223 lines
6.5 KiB
Fortran
223 lines
6.5 KiB
Fortran
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
|