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Correct the estimate of SNR for FT4 signals.

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Joe Taylor 2019-01-29 13:56:04 -05:00
parent 0a6d67c1d6
commit 7e3b153d8b
1 changed files with 1 additions and 1 deletions
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lib/ft4/ft4_decode.f90
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@ -74,7 +74,7 @@ subroutine ft4_decode(cdatetime0,nfqso,iwave,ndecodes,mycall,hiscall,nrx,line)
ndecodes=0 ndecodes=0
do icand=1,ncand do icand=1,ncand
f0=candidate(1,icand) f0=candidate(1,icand)
xsnr=10*log10(candidate(3,icand))-15.0 xsnr=10*log10(candidate(3,icand))-18.0
if( f0.le.375.0 .or. f0.ge.(5000.0-375.0) ) cycle if( f0.le.375.0 .or. f0.ge.(5000.0-375.0) ) cycle
call ft4_downsample(iwave,f0,cd2) ! downsample from 320 Sa/Symbol to 20 Sa/Symbol call ft4_downsample(iwave,f0,cd2) ! downsample from 320 Sa/Symbol to 20 Sa/Symbol
sum2=sum(cd2*conjg(cd2))/(20.0*76) sum2=sum(cd2*conjg(cd2))/(20.0*76)