mirror of https://github.com/saitohirga/WSJT-X.git
31 lines
905 B
Fortran
31 lines
905 B
Fortran
subroutine spec64(c0,npts2,mode64,jpk,s3,LL,NN)
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parameter (NSPS=3456) !Samples per symbol at 6000 Hz
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complex c0(0:360000) !Complex spectrum of dd()
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complex cs(0:NSPS-1) !Complex symbol spectrum
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real s3(LL,NN) !Synchronized symbol spectra
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nfft6=nsps
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fac=1.0/nfft6
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do j=1,63
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jj=j+7 !Skip first Costas array
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if(j.ge.32) jj=j+14 !Skip middle Costas array
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ja=jpk + (jj-1)*nfft6
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jb=ja+nfft6-1
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cs(0:nfft6-1)=fac*c0(ja:jb)
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call four2a(cs,nfft6,1,-1,1)
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smax=0.
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do ii=1,LL
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i=ii-65
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if(i.lt.0) i=i+nfft6
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s3(ii,j)=real(cs(i))**2 + aimag(cs(i))**2
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if(s3(ii,j).gt.smax) then
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smax=s3(ii,j)
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ipk=ii-65
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endif
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enddo
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enddo
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return
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end subroutine spec64
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