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https://github.com/jtdx-project/jtdx
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121 lines
3.1 KiB
Fortran
121 lines
3.1 KiB
Fortran
! This source code file was last time modified by Igor UA3DJY on July 20th, 2017.
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! All changes are shown in the patch file coming together with the full JTDX source code.
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subroutine sync9(nzhsym,lag1,lag2,ia,ib,ccfred,red2)
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use jt9_mod1 ! dd9(0:NPTS9-1) NPTS9=618624
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include 'constants.f90' ! NSMAX=6827 MAXFFT3=16384
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include 'jt9sync.f90'
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real, DIMENSION(:), ALLOCATABLE :: dd1
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real, DIMENSION(:,:), ALLOCATABLE :: ss
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real ccfred(NSMAX),savg(NSMAX),savg2(NSMAX),sq(NSMAX),red2(NSMAX),ss1(184),smo(-5:25)
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real x(MAXFFT3),w(MAXFFT3)
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complex c(0:MAXFFT3/2)
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logical(1) first
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equivalence (x,c)
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data first/.true./
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save first,w
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fac1=0.1
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fac2=(1.0/MAXFFT3)**2; twopi=6.28318531
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nhstep=3456 ! 6912/2
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if(first) then ! Compute the FFT window
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do k=1,MAXFFT3
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w(k)=sin(twopi*(k+2)/32768) ! 32768 = 2*MAXFFT3
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enddo
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first=.false.
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endif
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allocate(dd1(631552), STAT = nAllocateStatus1)
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if(nAllocateStatus1.ne.0) STOP "Not enough memory"
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allocate(ss(184,NSMAX), STAT = nAllocateStatus1)
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if(nAllocateStatus1.ne.0) STOP "Not enough memory"
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dd1(1:NPTS9)=dd9(0:NPTS9-1) ! NPTS9=618624
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dd1(NPTS9+1:631552)=0.
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do j=1,nzhsym !nhsym
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i0=(j-1)*nhstep
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x=fac1*w*dd1(i0+1:i0+MAXFFT3)
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call four2a(c,MAXFFT3,1,-1,0) !r2c forward FFT
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do i=ia,ib
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s=fac2*SQRT(real(c(i))**2 + aimag(c(i))**2)
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ss(j,i)=s
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enddo
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enddo
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deallocate (dd1, STAT = nDeAllocateStatus1)
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if (nDeAllocateStatus1.ne.0) print *, 'failed to release memory'
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ipk=0; 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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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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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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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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enddo
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ccfred(i)=smax !Best at this freq, over all lags
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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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deallocate (ss, STAT = nDeAllocateStatus1)
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if (nDeAllocateStatus1.ne.0) print *, 'failed to release memory'
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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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