mirror of https://github.com/saitohirga/WSJT-X.git
57 lines
1.4 KiB
Fortran
57 lines
1.4 KiB
Fortran
subroutine test9(c0,npts8,nsps8)
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parameter (NMAX=128*864)
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complex c0(0:npts8-1)
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complex c1(0:NMAX-1)
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complex c2(0:4096-1)
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complex z
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real p(0:3300)
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include 'jt9sync.f90'
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c1(0:npts8-1)=c0 !Copy c0 into c1
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c1(npts8:)=0. !Zero the rest of c1
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nfft1=NMAX !Forward FFT length
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call four2a(c1,nfft1,1,-1,1) !Forward FFT
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ndown=54 !Downsample factor
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nfft2=nfft1/ndown !Backward FFT length
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nh2=nfft2/2
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fac=1.e-5
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c2(0:nh2)=fac*c1(0:nh2)
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c2(nh2+1:nh2+nh2-1)=fac*c1(nfft1-nh2+1:nfft1-1)
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call four2a(c2,nfft2,1,1,1) !Backward FFT
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nspsd=nsps8/ndown
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nz=npts8/ndown
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! Start of afc loop here: solve for DT, f0, f1, f2, (phi0) ?
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p=0.
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i0=5*nspsd
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do i=0,nz-1
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z=sum(c2(max(i-(nspsd-1),0):i)) !Integrate
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p(i0+i)=real(z)**2 + aimag(z)**2 !Symbol power at freq=0
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! Option here for coherent processing ?
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enddo
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iz=85*nspsd
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lagmax=13*nspsd
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do lag=0,lagmax
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sum0=0.
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sum1=0.
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j=-nspsd
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do i=1,85
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j=j+nspsd
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if(isync(i).eq.1) then
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sum1=sum1+p(j+lag)
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else
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sum0=sum0+p(j+lag)
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endif
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enddo
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ss=(sum1/16.0)/(sum0/69.0) - 1.0
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write(52,3001) lag,ss
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3001 format(i5,f12.3)
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enddo
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return
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end subroutine test9
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