mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-29 23:58:39 -05:00
f8a673077b
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7699 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
48 lines
1.2 KiB
Fortran
48 lines
1.2 KiB
Fortran
subroutine getfc1w(c,fs,fa,fb,fc1,xsnr)
|
|
|
|
include 'wsprlf_params.f90'
|
|
complex c(0:NZ-1) !Complex waveform
|
|
complex c2(0:NFFT1-1) !Short spectra
|
|
real s(-NH1+1:NH1) !Coarse spectrum
|
|
nspec=NZ/NFFT1
|
|
df1=fs/NFFT1
|
|
s=0.
|
|
do k=1,nspec
|
|
ia=(k-1)*N2
|
|
ib=ia+N2-1
|
|
c2(0:N2-1)=c(ia:ib)
|
|
c2(N2:)=0.
|
|
call four2a(c2,NFFT1,1,-1,1)
|
|
do i=0,NFFT1-1
|
|
j=i
|
|
if(j.gt.NH1) j=j-NFFT1
|
|
s(j)=s(j) + real(c2(i))**2 + aimag(c2(i))**2
|
|
enddo
|
|
enddo
|
|
! call smo121(s,NFFT1)
|
|
smax=0.
|
|
ipk=0
|
|
fc1=0.
|
|
ia=nint(fa/df1)
|
|
ib=nint(fb/df1)
|
|
do i=ia,ib
|
|
f=i*df1
|
|
if(s(i).gt.smax) then
|
|
smax=s(i)
|
|
ipk=i
|
|
fc1=f
|
|
endif
|
|
! write(51,3001) f,s(i),db(s(i))
|
|
! 3001 format(f10.3,e12.3,f10.3)
|
|
enddo
|
|
|
|
! The following is for testing SNR calibration:
|
|
sp3n=(s(ipk-1)+s(ipk)+s(ipk+1)) !Sig + 3*noise
|
|
base=(sum(s)-sp3n)/(NFFT1-3.0) !Noise per bin
|
|
psig=sp3n-3*base !Sig only
|
|
pnoise=(2500.0/df1)*base !Noise in 2500 Hz
|
|
xsnr=db(psig/pnoise)
|
|
|
|
return
|
|
end subroutine getfc1w
|