mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-09 02:26:06 -05:00
56 lines
1.0 KiB
Fortran
56 lines
1.0 KiB
Fortran
|
subroutine sync9f(s2,nq,nfa,nfb,ss2,ss3,lagpk,ipk,ccfbest)
|
||
|
|
|
||
|
|
! Look for JT9 sync pattern in the folded symbol spectra, s2.
|
||
|
|
! Frequency search extends from nfa to nfb. Synchronized symbol
|
||
|
|
! spectra are put into ss2() and ss3().
|
||
|
|
|
||
|
|
integer ii4(16)
|
||
|
|
real s2(240,340)
|
||
|
|
real ss2(0:8,85)
|
||
|
|
real ss3(0:7,69)
|
||
|
|
include 'jt9sync.f90'
|
||
|
|
|
||
|
|
ii4=4*ii-3
|
||
|
|
ccf=0.
|
||
|
|
ccfbest=0.
|
||
|
|
nfft=4*nq
|
||
|
|
df=12000.0/nfft
|
||
|
|
ia=nfa/df
|
||
|
|
ib=nfb/df + 0.9999
|
||
|
|
|
||
|
|
do i=ia,ib
|
||
|
|
do lag=0,339
|
||
|
|
t=0.
|
||
|
|
do n=1,16
|
||
|
|
j=ii4(n)+lag
|
||
|
|
if(j.gt.340) j=j-340
|
||
|
|
t=t + s2(i,j)
|
||
|
|
enddo
|
||
|
|
if(t.gt.ccfbest) then
|
||
|
|
lagpk=lag
|
||
|
|
ipk=i
|
||
|
|
ccfbest=t
|
||
|
|
endif
|
||
|
|
enddo
|
||
|
|
enddo
|
||
|
|
|
||
|
|
do i=0,8
|
||
|
|
j4=lagpk-4
|
||
|
|
i2=2*i + ipk
|
||
|
|
if(i2.lt.1) i2=1
|
||
|
|
m=0
|
||
|
|
do j=1,85
|
||
|
|
j4=j4+4
|
||
|
|
if(j4.gt.340) j4=j4-340
|
||
|
|
if(j4.lt.1) j4=j4+340
|
||
|
|
ss2(i,j)=s2(i2,j4)
|
||
|
|
if(i.ge.1 .and. isync(j).eq.0) then
|
||
|
|
m=m+1
|
||
|
|
ss3(i-1,m)=ss2(i,j)
|
||
|
|
endif
|
||
|
|
enddo
|
||
|
|
enddo
|
||
|
|
|
||
|
|
return
|
||
|
|
end subroutine sync9f
|