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Tweak SNR calibration.

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This commit is contained in:
Steven Franke 2020-07-26 19:31:20 -05:00
parent 4d439e5248
commit 3de14a5436
1 changed files with 6 additions and 2 deletions
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8
lib/fst4_decode.f90
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@ -552,9 +552,13 @@ contains
do i=1,NN do i=1,NN
xsig=xsig+s4(itone(i),i)**2 xsig=xsig+s4(itone(i),i)**2
enddo enddo
arg=400.0*(xsig/base)-1.0 arg=600.0*(xsig/base)-1.0
if(arg.gt.0.0) then if(arg.gt.0.0) then
xsnr=10*log10(arg)-21.0-11.7*log10(nsps/800.0) xsnr=10*log10(arg)-35.5-12.5*log10(nsps/8200.0)
if(ntrperiod.eq. 15) xsnr=xsnr+2
if(ntrperiod.eq. 30) xsnr=xsnr+1
if(ntrperiod.eq. 900) xsnr=xsnr+1
if(ntrperiod.eq.1800) xsnr=xsnr+2
else else
xsnr=-99.9 xsnr=-99.9
endif endif