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39 lines
902 B
Fortran
39 lines
902 B
Fortran
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subroutine syncmsk(cdat,npts,cwb,r,i1)
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! Establish character sync within a JTMS ping.
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complex cdat(npts) !Analytic signal
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complex cwb(168) !Complex waveform for 'space'
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real r(60000)
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real tmp(60000)
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integer hist(168),hmax(1)
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complex z
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r=0.
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jz=npts-168+1
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do j=1,jz
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z=0.
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ss=0.
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do i=1,168
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ss=ss + abs(cdat(i+j-1)) !Total power
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z=z + cdat(i+j-1)*conjg(cwb(i)) !Signal matching <space>
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enddo
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r(j)=abs(z)/ss !Goodness-of-fit to <space>
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! write(52,3001) j/168.0,r(j),cdat(j)
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!3001 format(4f12.3)
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enddo
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ncut=99.0*float(jz-10)/float(jz)
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call pctile(r,tmp,jz,ncut,rlim)
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hist=0
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do j=1,jz
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k=mod(j-1,168)+1
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if(r(j).gt.rlim) hist(k)=hist(k)+1
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enddo
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hmax=maxloc(hist)
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i1=hmax(1)
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return
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end subroutine syncmsk
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