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Better calibration of SNR.

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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6799 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke 2016-06-23 02:43:40 +00:00
parent f43c4fddbc
commit 0e3cb2ee8c
1 changed files with 4 additions and 3 deletions
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7
lib/detectmsk144.f90
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@ -40,7 +40,7 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
logical first
data first/.true./
data s8/0,1,1,1,0,0,1,0/
save df,first,cb,fs,pi,twopi,dt,s8,rcw,pp,hannwindow
save df,first,cb,fs,pi,twopi,dt,s8,rcw,pp,hannwindow,nmatchedfilter
if(first) then
nmatchedfilter=1
@ -147,7 +147,8 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
enddo ! end of detection-metric and frequency error estimation loop
call indexx(detmet(1:nstep),nstep,indices) !find median of detection metric vector
xmed=detmet(indices(nstep/2))
! xmed=detmet(indices(nstep/2))
xmed=detmet(indices(nstep/4))
detmet=detmet/xmed ! noise floor of detection metric is 1.0
ndet=0
@ -158,7 +159,7 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
ndet=ndet+1
times(ndet)=((il-1)*216+NSPM/2)*dt
ferrs(ndet)=detfer(il)
snrs(ndet)=10.0*log10(detmet(il))/2-5.0 !/2 because detmet is a 4th order moment
snrs(ndet)=12.0*log10(detmet(il))/2-9.0
detmet(il-3:il+3)=0.0
! write(*,*) ndet,"snr ",snrs(ndet),"ferr ",ferrs(ndet)
enddo