mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-18 01:52:05 -05:00
3ba268cf14
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/jtms3@2519 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
39 lines
902 B
Fortran
39 lines
902 B
Fortran
subroutine syncmsk(cdat,npts,cwb,r,i1)
|
|
|
|
! Establish character sync within a JTMS ping.
|
|
|
|
complex cdat(npts) !Analytic signal
|
|
complex cwb(168) !Complex waveform for 'space'
|
|
real r(60000)
|
|
real tmp(60000)
|
|
integer hist(168),hmax(1)
|
|
complex z
|
|
|
|
r=0.
|
|
jz=npts-168+1
|
|
do j=1,jz
|
|
z=0.
|
|
ss=0.
|
|
do i=1,168
|
|
ss=ss + abs(cdat(i+j-1)) !Total power
|
|
z=z + cdat(i+j-1)*conjg(cwb(i)) !Signal matching <space>
|
|
enddo
|
|
r(j)=abs(z)/ss !Goodness-of-fit to <space>
|
|
! write(52,3001) j/168.0,r(j),cdat(j)
|
|
!3001 format(4f12.3)
|
|
enddo
|
|
|
|
ncut=99.0*float(jz-10)/float(jz)
|
|
call pctile(r,tmp,jz,ncut,rlim)
|
|
hist=0
|
|
do j=1,jz
|
|
k=mod(j-1,168)+1
|
|
if(r(j).gt.rlim) hist(k)=hist(k)+1
|
|
enddo
|
|
|
|
hmax=maxloc(hist)
|
|
i1=hmax(1)
|
|
|
|
return
|
|
end subroutine syncmsk
|