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Make noise analysis bandwidth at least 10 times the signal bandwidth, when possible.

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This commit is contained in:
Steven Franke 2020-06-22 15:21:55 -05:00
parent 37eff41549
commit 67f2450cc5
1 changed files with 16 additions and 5 deletions
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21
lib/fst280_decode.f90
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@ -464,20 +464,31 @@ contains
df2=baud/2.0
nd=df2/df1
ndh=nd/2
ia=fa/df2
ib=fb/df2
ia=nint(max(100.0,fa)/df2)
ib=nint(min(4800.0,fb)/df2)
signal_bw=4*(12000.0/nsps)*hmod
analysis_bw=min(4800.0,fb)-max(100.0,fa)
noise_bw=10.0*signal_bw
if(analysis_bw.gt.noise_bw) then
ina=ia
inb=ib
else
fcenter=(fa+fb)/2.0
ina=nint(max(100.0,fcenter-noise_bw/2.)/df2)
inb=nint(min(4800.0,fcenter+noise_bw/2.)/df2)
endif
s=0.
do i=ia,ib
do i=ina,inb ! noise analysis window includes signal analysis window
j0=nint(i*df2/df1)
do j=j0-ndh,j0+ndh
s(i)=s(i) + real(c_bigfft(j))**2 + aimag(c_bigfft(j))**2
enddo
enddo
nh=hmod
do i=ia,ib
do i=ina,inb
s2(i)=s(i-nh*3) + s(i-nh) +s(i+nh) +s(i+nh*3)
enddo
call pctile(s2(ia:ib),ib-ia+1,30,base)
call pctile(s2(ina:inb),ib-ia+1,30,base)
s2=s2/base
thresh=1.30