mirror of https://github.com/saitohirga/WSJT-X.git
55 lines
1.0 KiB
Fortran
55 lines
1.0 KiB
Fortran
subroutine peakdt9(c2,nsps8,nspsd,c3,xdt)
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parameter (NZ2=1512,NZ3=1360)
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complex c2(0:NZ2-1)
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complex c3(0:NZ3-1)
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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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p=0.
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i0=5*nspsd
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do i=0,NZ2-1
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z=1.e-3*sum(c2(max(i-(nspsd-1),0):i))
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p(i0+i)=real(z)**2 + aimag(z)**2 !Integrated symbol power at freq=0
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enddo
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call getlags(nsps8,lag0,lag1,lag2)
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tsymbol=nsps8/1500.0
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dtlag=tsymbol/nspsd
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smax=0.
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lagpk=0
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do lag=lag1,lag2
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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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xdt=(lag-lag0)*dtlag
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if(ss.gt.smax) then
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smax=ss
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lagpk=lag
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endif
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enddo
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xdt=(lagpk-lag0)*dtlag
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do i=0,NZ3-1
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j=i+lagpk-i0-nspsd+1
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if(j.ge.0 .and. j.lt.NZ2) then
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c3(i)=c2(j)
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else
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c3(i)=0.
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endif
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enddo
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return
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end subroutine peakdt9
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