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116 lines
2.8 KiB
Fortran
116 lines
2.8 KiB
Fortran
module wideband2_sync
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parameter (NFFT=32768)
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integer isync(22)
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integer nkhz_center
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real sync_dat(NFFT,6) !fkhz, ccfmax, xdt, ipol, flip
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real savg_med(4)
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contains
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subroutine wb2_sync(ss,savg,nfa,nfb)
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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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integer jsync0(63)
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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 jsync0/ &
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1, 4, 5, 9, 10, 11, 12, 13, 14, 16, 18, 22, 24, 25, 28, 32, &
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33, 34, 37, 38, 39, 40, 42, 43, 45, 46, 47, 48, 52, 53, 55, 57, &
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59, 60, 63, 64, 66, 68, 70, 73, 80, 81, 89, 90, 92, 95, 97, 98, &
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100,102,104,107,108,111,114,119,120,121,122,123,124,125,126/
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data first/.true./
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save first
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do j=322,1,-1
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if(sum(ss(1,j,1:NFFT)).gt.0.0) exit
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enddo
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jz=j
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tstep=2048.0/11025.0 !0.185760 s: 0.5*tsym_jt65, 0.3096*tsym_q65
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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 Q65 sync stride
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isync(i)=nint((isync0(i)-1)*fac) + 1
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enddo
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do i=1,63
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jsync0(i)=2*(jsync0(i)-1) + 1
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enddo
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first=.false.
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endif
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df3=96000.0/NFFT
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ia=nint(1000*nfa/df3) !Flat frequency range for WSE converters
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ib=nint(1000*nfb/df3)
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do i=1,4
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call pctile(savg(i,ia:ib),ib-ia+1,50,savg_med(i))
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enddo
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do i=ia,ib
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write(14,3014) 0.001*i*df3,savg(1:4,i)
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3014 format(5f10.3)
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enddo
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lagbest=0
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ipolbest=1
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flip=0.
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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+1) + ss(ipol,k+1,i+1) + ss(ipol,k+2,i+1)
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enddo
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ccf=ccf - savg(ipol,i+1)*3*22/float(jz)
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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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flip=0.
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endif
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ccf=0.
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do j=1,63
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k=jsync0(j) + lag
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ccf=ccf + ss(ipol,k,i+1) + ss(ipol,k+1,i+1)
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enddo
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ccf=ccf - savg(ipol,i+1)*2*63/float(jz)
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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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flip=1.0
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endif
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enddo ! lag
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enddo !ipol
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fkhz=0.001*i*df3 + nkhz_center - 48.0
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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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sync_dat(i,5)=flip
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sync_dat(i,6)=ccfmax/(savg(ipolbest,i)/savg_med(ipolbest))
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enddo
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call pctile(sync_dat(ia:ib,2),ib-ia+1,50,base)
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sync_dat(ia:ib,2)=sync_dat(ia:ib,2)/base
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return
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end subroutine wb2_sync
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end module wideband2_sync
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