2021-04-29 14:35:19 -04:00
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module wideband_sync
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parameter (NFFT=32768)
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integer isync(22)
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2021-04-29 17:05:11 -04:00
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integer nkhz_center
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2021-04-29 14:35:19 -04:00
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real sync_dat(NFFT,4) !fkhz, ccfmax, xdt, ipol
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contains
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subroutine wb_sync(ss,savg)
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! Compute "orange sync curve" using the Q65 sync pattern
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parameter (LAGMAX=30)
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real ss(4,322,NFFT)
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real savg(4,NFFT)
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logical first
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integer isync0(22)
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! Q65 sync symbols
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data isync0/1,9,12,13,15,22,23,26,27,33,35,38,46,50,55,60,62,66,69,74,76,85/
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data first/.true./
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save first
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tstep=2048.0/11025.0
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if(first) then
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fac=0.6/tstep
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do i=1,22 !Expand the sync stride
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isync(i)=nint((isync0(i)-1)*fac) + 1
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enddo
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first=.false.
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endif
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df=96000.0/NFFT
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ia=nint(7000.0/df) !Flat frequency range for WSE converters
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ib=nint(89000.0/df)
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lagbest=-1
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ipolbest=-1
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do i=ia,ib
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ccfmax=0.
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do ipol=1,4
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do lag=0,LAGMAX
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ccf=0.
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do j=1,22
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k=isync(j) + lag
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ccf=ccf + ss(ipol,k,i)
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enddo
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ccf=ccf - savg(ipol,i)*22.0/322.0
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if(ccf.gt.ccfmax) then
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ipolbest=ipol
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lagbest=lag
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ccfmax=ccf
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endif
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enddo ! lag
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enddo !ipol
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2021-04-30 15:22:41 -04:00
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fkhz=0.001*i*df + nkhz_center - 48.0
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2021-04-29 14:35:19 -04:00
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xdt=lagbest*tstep-1.0
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sync_dat(i,1)=fkhz
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sync_dat(i,2)=ccfmax
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sync_dat(i,3)=xdt
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sync_dat(i,4)=ipolbest
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2021-04-30 15:22:41 -04:00
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! write(14,3010) i,sync_dat(i,1:3),nint(sync_dat(i,4)),0.001*i*df,nkhz_center
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!3010 format(i6,3f10.3,i5,f10.3,i5)
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2021-04-29 14:35:19 -04:00
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enddo
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return
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end subroutine wb_sync
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end module wideband_sync
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