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When using click-to-decode in FT8 (nagain=.true.), the regular noise baseline estimator fails, producing erroneous and very large SNR estimates. Revert to the older signal-to-noise-plus-interference calculation for click-to-decode.

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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@8076 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke 2017-09-09 18:09:18 +00:00
parent cca68e2769
commit 4d5331899b
1 changed files with 1 additions and 3 deletions
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lib/fsk4hf/ft8b.f90
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@ -337,12 +337,10 @@ subroutine ft8b(dd0,newdat,nQSOProgress,nfqso,nftx,ndepth,lapon,napwid, &
xsnr=0.001 xsnr=0.001
if(xnoi.gt.0 .and. xnoi.lt.xsig) xsnr=xsig/xnoi-1.0 if(xnoi.gt.0 .and. xnoi.lt.xsig) xsnr=xsig/xnoi-1.0
xsnr=10.0*log10(xsnr)-27.0 xsnr=10.0*log10(xsnr)-27.0
!###
xsnr2=db(xsig/xbase - 1.0) - 32.0 xsnr2=db(xsig/xbase - 1.0) - 32.0
! write(52,3052) f1,xdt,xsig,xnoi,xbase,xsnr,xsnr2 ! write(52,3052) f1,xdt,xsig,xnoi,xbase,xsnr,xsnr2
!3052 format(7f10.2) !3052 format(7f10.2)
xsnr=xsnr2 if(.not.nagain) xsnr=xsnr2
!###
if(xsnr .lt. -24.0) xsnr=-24.0 if(xsnr .lt. -24.0) xsnr=-24.0
return return
endif endif