mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-16 00:51:56 -05:00
65 lines
1.5 KiB
Fortran
65 lines
1.5 KiB
Fortran
subroutine getcandidates2a(id,fa,fb,maxcand,savg,candidate,ncand)
|
|
|
|
! For now, hardwired to find the largest peak in the average spectrum
|
|
|
|
include 'ft2_params.f90'
|
|
real s(NH1,NHSYM)
|
|
real savg(NH1),savsm(NH1)
|
|
real x(NFFT1)
|
|
complex cx(0:NH1)
|
|
real candidate(3,100)
|
|
integer*2 id(NMAX)
|
|
integer*1 s8(8)
|
|
integer indx(NH1)
|
|
data s8/0,1,1,1,0,0,1,0/
|
|
equivalence (x,cx)
|
|
|
|
! Compute symbol spectra, stepping by NSTEP steps.
|
|
savg=0.
|
|
tstep=NSTEP/12000.0
|
|
df=12000.0/NFFT1 !3.125 Hz
|
|
fac=1.0/300.0
|
|
do j=1,NHSYM
|
|
ia=(j-1)*NSTEP + 1
|
|
ib=ia+NSPS-1
|
|
x(1:NSPS)=fac*id(ia:ib)
|
|
x(NSPS+1:)=0.
|
|
call four2a(x,NFFT1,1,-1,0) !r2c FFT
|
|
do i=1,NH1
|
|
s(i,j)=real(cx(i))**2 + aimag(cx(i))**2
|
|
enddo
|
|
savg=savg + s(1:NH1,j) !Average spectrum
|
|
enddo
|
|
savsm=0.
|
|
do i=2,NH1-1
|
|
savsm(i)=sum(savg(i-1:i+1))/3.
|
|
enddo
|
|
savsm(1)=savg(1)
|
|
savsm(NH1)=savg(NH1)
|
|
|
|
nfa=nint(fa/df)
|
|
nfb=nint(fb/df)
|
|
np=nfb-nfa+1
|
|
indx=0
|
|
call indexx(savsm(nfa:nfb),np,indx)
|
|
xn=savsm(nfa+indx(nint(0.3*np)))
|
|
if(xn.ne.0) savsm=savsm/xn
|
|
imax=-1
|
|
xmax=-99.
|
|
do i=2,NH1-1
|
|
if(savsm(i).gt.savsm(i-1).and. &
|
|
savsm(i).gt.savsm(i+1).and. &
|
|
savsm(i).gt.xmax) then
|
|
xmax=savsm(i)
|
|
imax=i
|
|
endif
|
|
enddo
|
|
f0=imax*df
|
|
if(xmax.gt.1.2) then
|
|
if(ncand.lt.maxcand) ncand=ncand+1
|
|
candidate(1,ncand)=f0
|
|
endif
|
|
|
|
return
|
|
end subroutine getcandidates2a
|