mirror of https://github.com/saitohirga/WSJT-X.git
54 lines
1.2 KiB
Fortran
54 lines
1.2 KiB
Fortran
subroutine sync9(ss,nzhsym,tstep,df3,ntol,nfqso,ccfred,ia,ib,ipkbest)
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parameter (NSMAX=22000) !Max length of saved spectra
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real ss(184,NSMAX)
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real ccfred(NSMAX)
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include 'jt9sync.f90'
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ipk=0
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ipkbest=0
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ia=1
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ib=min(1000,nint(1000.0/df3))
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if(ntol.lt.1000) then
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ia=nint((nfqso-1000-ntol)/df3)
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ib=nint((nfqso-1000+ntol)/df3)
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if(ia.lt.1) ia=1
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if(ib.gt.NSMAX) ib=NSMAX
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endif
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sbest=0.
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lag1=-(2.5/tstep + 0.9999)
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lag2=5.0/tstep + 0.9999
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ccfred=0.
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do i=ia,ib
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smax=0.
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do lag=lag1,lag2
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sum=0.
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do j=1,16
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k=ii2(j) + lag
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kaa=ka(j)+lag
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kbb=kb(j)+lag
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if(k.ge.1 .and. k.le.nzhsym) sum=sum + ss(k,i) - &
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0.5*(ss(kaa,i)+ss(kbb,i))
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enddo
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if(sum.gt.smax) then
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smax=sum
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ipk=i
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endif
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enddo
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ccfred(i)=smax !Best at this freq, over all lags
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if(smax.gt.sbest) then
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sbest=smax
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ipkbest=ipk
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endif
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enddo
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call pctile(ccfred(ia),ib-ia+1,50,xmed)
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if(xmed.le.0.0) xmed=1.0
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ccfred=ccfred/xmed
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return
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end subroutine sync9
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