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https://github.com/saitohirga/WSJT-X.git
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6bf40a28d7
displayed DT values appear to be to low by 0.2 s -- they range from -2.2 s to +4.8 s, according to files generated by jt65sim. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6179 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
49 lines
1.2 KiB
Fortran
49 lines
1.2 KiB
Fortran
subroutine ccf2(ss,nz,nflip,ccfbest,xlagpk)
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parameter (LAGMIN=-86,LAGMAX=258)
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real ss(nz)
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real ccf(-LAGMAX:LAGMAX)
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integer npr(126)
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! The JT65 pseudo-random sync pattern:
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data npr/ &
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1,0,0,1,1,0,0,0,1,1,1,1,1,1,0,1,0,1,0,0, &
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0,1,0,1,1,0,0,1,0,0,0,1,1,1,0,0,1,1,1,1, &
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0,1,1,0,1,1,1,1,0,0,0,1,1,0,1,0,1,0,1,1, &
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0,0,1,1,0,1,0,1,0,1,0,0,1,0,0,0,0,0,0,1, &
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1,0,0,0,0,0,0,0,1,1,0,1,0,0,1,0,1,1,0,1, &
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0,1,0,1,0,0,1,1,0,0,1,0,0,1,0,0,0,0,1,1, &
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1,1,1,1,1,1/
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save
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ccfbest=0.
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lag1=LAGMIN
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lag2=LAGMAX
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do lag=lag1,lag2
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s0=0.
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s1=0.
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do i=1,126
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j=16*(i-1)+1 + lag
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if(j.ge.1 .and. j.le.nz-8) then
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x=ss(j)
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if(npr(i).eq.0) then
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s0=s0 + x
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else
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s1=s1 + x
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endif
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endif
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enddo
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ccf(lag)=nflip*(s1-s0)
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if(ccf(lag).gt.ccfbest) then
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ccfbest=ccf(lag)
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lagpk=lag
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xlagpk=lagpk
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endif
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enddo
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if( lagpk.gt.-LAGMAX .and. lagpk.lt.LAGMAX) then
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call peakup(ccf(lagpk-1),ccf(lagpk),ccf(lagpk+1),dx)
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xlagpk=lagpk+dx
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endif
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return
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end subroutine ccf2
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