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Reconfigure to optimize decoder for MF/LF (high coherence) channels.
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@ -105,7 +105,7 @@ subroutine get_fst4_bitmetrics(cd,nss,hmod,nmax,nhicoh,bitmetrics,s4,badsync)
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csum=csum+cs(graymap(ntone),ks+j)*cterm
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cterm=cterm*conjg(cp(graymap(ntone)))
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enddo
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s2(i)=abs(csum)**2
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s2(i)=abs(csum)
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enddo
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ipt=1+(ks-1)*2
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if(nsym.eq.1) ibmax=1
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@ -275,12 +275,8 @@ contains
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fb=min(4800,nfb)
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endif
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if(hmod.eq.1) then
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if(ntrperiod.eq.15) minsync=1.15
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if(ntrperiod.gt.15) minsync=1.25
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elseif(hmod.gt.1) then
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minsync=1.2
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endif
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minsync=1.2
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if(ntrperiod.eq.15) minsync=1.15
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! Get first approximation of candidate frequencies
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call get_candidates_fst4(c_bigfft,nfft1,nsps,hmod,fs,fa,fb, &
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@ -788,13 +784,13 @@ contains
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iploc=ia+im(1)-1 !Index of CCF peak
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pval=s2(iploc) !Peak value
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if(pval.lt.minsync) exit
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! do i=-3,+3 !Remove 0.9 of a model CCF at
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! k=iploc+2*hmod*i !this frequency from s2()
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! if(k.ge.ia .and. k.le.ib) then
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! s2(k)=max(0.,s2(k)-0.9*pval*xdb(i))
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! endif
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! enddo
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s2(max(1,iploc-2*hmod*3):min(nnw,iploc+2*hmod*3))=0.0
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do i=-3,+3 !Remove 0.9 of a model CCF at
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k=iploc+2*hmod*i !this frequency from s2()
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if(k.ge.ia .and. k.le.ib) then
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s2(k)=max(0.,s2(k)-0.9*pval*xdb(i))
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endif
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enddo
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! s2(max(1,iploc-2*hmod*3):min(nnw,iploc+2*hmod*3))=0.0
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ncand=ncand+1
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candidates(ncand,1)=df2*iploc !Candidate frequency
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candidates(ncand,2)=pval !Rough estimate of SNR
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