97 lines
2.5 KiB
Plaintext
97 lines
2.5 KiB
Plaintext
subroutine sync65(nfa,nfb,naggressive,ntol,nqsym,ca,ncand,nrobust, &
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bVHF)
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parameter (NSZ=3413,NFFT=8192,MAXCAND=300)
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real ss(552,NSZ)
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real ccfblue(-32:82) !CCF with pseudorandom sequence
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real ccfred(NSZ) !Peak of ccfblue, as function of freq
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logical bVHF
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type candidate
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real freq
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real dt
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real sync
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real flip
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end type candidate
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type(candidate) ca(MAXCAND)
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common/steve/thresh0
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common/sync/ss
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if(ntol.eq.-99) stop !Silence compiler warning
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call setup65
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df=12000.0/NFFT !df = 12000.0/8192 = 1.465 Hz
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ia=max(2,nint(nfa/df))
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ib=min(NSZ-1,nint(nfb/df))
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! lag1=-11
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! lag2=59
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! lag1=-22
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! lag2=118
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lag1=-32
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lag2=82 !may need to be extended for EME
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nsym=126
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ncand=0
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fdot=0.
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ccfred=0.
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ccfblue=0.
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ccfmax=0.
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ipk=0
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do i=ia,ib
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call xcor(i,nqsym,nsym,lag1,lag2,ccfblue,ccf0,lagpk0,flip,fdot,nrobust)
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! Remove best-fit slope from ccfblue and normalize so baseline rms=1.0
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if(.not.bVHF) call slope(ccfblue(lag1),lag2-lag1+1, &
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lagpk0-lag1+1.0)
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ccfred(i)=ccfblue(lagpk0)
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if(ccfred(i).gt.ccfmax) then
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ccfmax=ccfred(i)
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ipk=i
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endif
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enddo
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call pctile(ccfred(ia:ib),ib-ia+1,35,xmed)
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ccfred(ia:ib)=ccfred(ia:ib)-xmed
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ccfred(ia-1)=ccfred(ia)
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ccfred(ib+1)=ccfred(ib)
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do i=ia,ib
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freq=i*df
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itry=0
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! if(naggressive.gt.0 .and. ntol.lt.1000 .and. ccfmax.ge.thresh0) then
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if(naggressive.gt.0 .and. ccfmax.ge.thresh0) then
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if(i.ne.ipk) cycle
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itry=1
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ncand=ncand+1
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else
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if(ccfred(i).ge.thresh0 .and. ccfred(i).gt.ccfred(i-1) .and. &
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ccfred(i).gt.ccfred(i+1)) then
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itry=1
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ncand=ncand+1
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endif
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endif
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if(itry.ne.0) then
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call xcor(i,nqsym,nsym,lag1,lag2,ccfblue,ccf0,lagpk,flip,fdot,nrobust)
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if(.not.bVHF) call slope(ccfblue(lag1),lag2-lag1+1, &
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lagpk-lag1+1.0)
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xlag=lagpk
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if(lagpk.gt.lag1 .and. lagpk.lt.lag2) then
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call peakup(ccfblue(lagpk-1),ccfmax,ccfblue(lagpk+1),dx2)
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xlag=lagpk+dx2
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endif
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dtx=xlag*1024.0/11025.0
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ccfblue(lag1)=0.
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ccfblue(lag2)=0.
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ca(ncand)%freq=freq
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ca(ncand)%dt=dtx
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ca(ncand)%flip=flip
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if(bVHF) then
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ca(ncand)%sync=db(ccfred(i)) - 16.0
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else
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ca(ncand)%sync=ccfred(i)
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endif
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endif
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if(ncand.eq.MAXCAND) exit
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enddo
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return
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end subroutine sync65
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