mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-10 22:26:23 -05:00
99 lines
2.3 KiB
Fortran
99 lines
2.3 KiB
Fortran
module wideband_sync
|
|
|
|
parameter (NFFT=32768)
|
|
integer isync(22)
|
|
integer nkhz_center
|
|
real sync_dat(NFFT,4) !fkhz, ccfmax, xdt, ipol
|
|
|
|
contains
|
|
|
|
subroutine wb_sync(ss,savg,ntone_spacing)
|
|
|
|
! Compute "orange sync curve" using the Q65 sync pattern
|
|
|
|
parameter (LAGMAX=30)
|
|
real ss(4,322,NFFT)
|
|
real savg(4,NFFT)
|
|
logical first
|
|
character*1 c1
|
|
! integer hist(0:20)
|
|
integer isync0(22)
|
|
! Q65 sync symbols
|
|
data isync0/1,9,12,13,15,22,23,26,27,33,35,38,46,50,55,60,62,66,69,74,76,85/
|
|
data first/.true./
|
|
save first
|
|
|
|
tstep=2048.0/11025.0
|
|
if(first) then
|
|
fac=0.6/tstep
|
|
do i=1,22 !Expand the sync stride
|
|
isync(i)=nint((isync0(i)-1)*fac) + 1
|
|
enddo
|
|
first=.false.
|
|
endif
|
|
|
|
df=96000.0/NFFT
|
|
ia=nint(7000.0/df) !Flat frequency range for WSE converters
|
|
ib=nint(89000.0/df)
|
|
lagbest=-1
|
|
ipolbest=-1
|
|
|
|
do i=ia,ib
|
|
ccfmax=0.
|
|
do ipol=1,4
|
|
do lag=0,LAGMAX
|
|
ccf=0.
|
|
do j=1,22
|
|
k=isync(j) + lag
|
|
ccf=ccf + ss(ipol,k,i+1)
|
|
enddo
|
|
ccf=ccf - savg(ipol,i+1)*22.0/322.0
|
|
if(ccf.gt.ccfmax) then
|
|
ipolbest=ipol
|
|
lagbest=lag
|
|
ccfmax=ccf
|
|
endif
|
|
enddo ! lag
|
|
enddo !ipol
|
|
|
|
fkhz=0.001*i*df + nkhz_center - 48.0
|
|
xdt=lagbest*tstep-1.0
|
|
sync_dat(i,1)=fkhz
|
|
sync_dat(i,2)=ccfmax
|
|
sync_dat(i,3)=xdt
|
|
sync_dat(i,4)=ipolbest
|
|
enddo
|
|
|
|
call pctile(sync_dat(ia:ib,2),ib-ia+1,50,base)
|
|
sync_dat(ia:ib,2)=sync_dat(ia:ib,2)/base
|
|
! hist=0
|
|
! s2_avg=63.5*ntone_spacing
|
|
! do i=ia,ib
|
|
! f0=0.001*i*df
|
|
! write(70,3010) f0,sync_dat(i,2:3),nint(sync_dat(i,4)), &
|
|
! 0.001*i*df,nkhz_center
|
|
!3010 format(3f10.3,i5,f10.3,i5)
|
|
! x=min(sync_dat(i,2),20.0)
|
|
! nx=x
|
|
! hist(nx)=hist(nx)+1
|
|
! if(x.gt.2.5) then
|
|
! c1=' '
|
|
! s0=sync_dat(i,2) - 1.0
|
|
! s1=(sync_dat(i-1,2) + sync_dat(i+1,2) - 2.0)/s0
|
|
! s2=(sum(sync_dat(i+ntone_spacing/2+1:i+64*ntone_spacing,2)) - s2_avg)/s0
|
|
! if(s2.ge.0.5) c1='*'
|
|
! write(72,3072) f0,s0,s1,s2,c1
|
|
!3072 format(f12.6,3f10.3,2x,a1)
|
|
! endif
|
|
! enddo
|
|
|
|
! do i=0,20
|
|
! write(71,3071) i,hist(i)
|
|
!3071 format(i2,i8)
|
|
! enddo
|
|
|
|
return
|
|
end subroutine wb_sync
|
|
|
|
end module wideband_sync
|