mirror of https://github.com/saitohirga/WSJT-X.git
97 lines
2.2 KiB
Fortran
97 lines
2.2 KiB
Fortran
subroutine sync9(ss,nzhsym,lag1,lag2,ia,ib,ccfred,red2,ipkbest)
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include 'constants.f90'
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real ss(184,NSMAX)
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real ss1(184)
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real ccfred(NSMAX)
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real savg(NSMAX)
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real savg2(NSMAX)
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real smo(-5:25)
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real sq(NSMAX)
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real red2(NSMAX)
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character*27 cr
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data cr/'(C) 2016, Joe Taylor - K1JT'/
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include 'jt9sync.f90'
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ipk=0
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ipkbest=0
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sbest=0.
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ccfred=0.
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do i=ia,ib !Loop over freq range
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ss1=ss(1:184,i)
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call pctile(ss1,nzhsym,40,xmed)
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ss1=ss1/xmed - 1.0
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do j=1,nzhsym
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if(ss1(j).gt.3.0) ss1(j)=3.0
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enddo
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call pctile(ss1,nzhsym,45,sbase)
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ss1=ss1-sbase
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sq0=dot_product(ss1(1:nzhsym),ss1(1:nzhsym))
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rms=sqrt(sq0/(nzhsym-1))
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smax=0.
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do lag=lag1,lag2 !DT = 2.5 to 5.0 s
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sum1=0.
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sq2=sq0
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nsum=nzhsym
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do j=1,16 !Sum over 16 sync symbols
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k=ii2(j) + lag
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if(k.ge.1 .and. k.le.nzhsym) then
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sum1=sum1 + ss1(k)
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sq2=sq2 - ss1(k)*ss1(k)
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nsum=nsum-1
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endif
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enddo
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if(sum1.gt.smax) then
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smax=sum1
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ipk=i
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endif
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rms=sqrt(sq2/(nsum-1))
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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=2.0*ccfred/xmed
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savg=0.
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do j=1,nzhsym
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savg(ia:ib)=savg(ia:ib) + ss(j,ia:ib)
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enddo
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savg(ia:ib)=savg(ia:ib)/nzhsym
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smo(0:20)=1.0/21.0
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smo(-5:-1)=-(1.0/21.0)*(21.0/10.0)
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smo(21:25)=smo(-5)
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do i=ia,ib
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sm=0.
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do j=-5,25
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if(i+j.ge.1 .and. i+j.lt.NSMAX) sm=sm + smo(j)*savg(i+j)
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enddo
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savg2(i)=sm
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sq(i)=sm*sm
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enddo
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call pctile(sq(ia:ib),ib-ia+1,20,sq0)
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rms=sqrt(sq0)
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savg2(ia:ib)=savg2(ia:ib)/(5.0*rms)
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red2=0.
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do i=ia+11,ib-10
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ref=max(savg2(i-10),savg2(i+10))
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red2(i)=savg2(i)-ref
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if(red2(i).lt.-99.0) red2(i)=-99.0
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if(red2(i).gt.99.0) red2(i)=99.0
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enddo
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return
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end subroutine sync9
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