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Add computation of an average spectrum of unmodulated FST4 signals after decoding.

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This commit is contained in:
Joe Taylor 2020-07-27 14:02:33 -04:00
parent e96dee4c23
commit 884854223c
1 changed files with 17 additions and 0 deletions
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17
lib/fst4_decode.f90
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@ -821,6 +821,7 @@ contains
complex, allocatable :: cwave(:) !Reconstructed complex signal
complex, allocatable :: g(:) !Channel gain, g(t) in QEX paper
real,allocatable :: ss(:) !Computed power spectrum of g(t)
real,allocatable,save :: ssavg(:) !Computed power spectrum of g(t)
integer itone(160) !Tones for this message
integer*2 iwave(nmax) !Raw Rx data
integer hmod !Modulation index
@ -907,6 +908,22 @@ contains
1010 format(f12.6,f12.6)
enddo
if(nsps.eq.720) then
ia=101.0/df
if(ncall.eq.1) then
allocate(ssavg(-ia:ia))
ssavg=0.
endif
rewind 53
do i=-ia,ia !Find smax in +/- 1 Hz around 0.
j=i
if(j.lt.0) j=i+nfft
ssavg(i)=ssavg(i) + real(g(j))**2 + aimag(g(j))**2
write(53,1020) i*df,ssavg(i)
1020 format(f12.6,e12.3)
enddo
endif
return
end subroutine write_ref