mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-03 16:01:18 -05:00
72dfe01bf3
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7321 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
155 lines
4.4 KiB
Fortran
155 lines
4.4 KiB
Fortran
subroutine sync64(dd,npts,nf1,nf2,nfqso,ntol,mode64,maxf1,dtx,f0,jpk,kpk, &
|
|
sync,c0)
|
|
|
|
use timer_module, only: timer
|
|
|
|
parameter (NMAX=60*12000) !Max size of raw data at 12000 Hz
|
|
parameter (NSPS=3456) !Samples per symbol at 6000 Hz
|
|
parameter (NSPC=7*NSPS) !Samples per Costas array
|
|
real dd(NMAX) !Raw data
|
|
real s1(0:NSPC-1) !Power spectrum of Costas 1
|
|
real s2(0:NSPC-1) !Power spectrum of Costas 2
|
|
real s3(0:NSPC-1) !Power spectrum of Costas 3
|
|
real s0(0:NSPC-1) !Sum of s1+s2+s3
|
|
real s0a(0:NSPC-1) !Best synchromized spectrum (saved)
|
|
real s0b(0:NSPC-1) !tmp
|
|
logical old_qra_sync
|
|
integer icos7(0:6) !Costas 7x7 tones
|
|
integer ipk0(1)
|
|
complex cc(0:NSPC-1) !Costas waveform
|
|
complex c0(0:720000) !Complex spectrum of dd()
|
|
complex c1(0:NSPC-1) !Complex spectrum of Costas 1
|
|
complex c2(0:NSPC-1) !Complex spectrum of Costas 2
|
|
complex c3(0:NSPC-1) !Complex spectrum of Costas 3
|
|
data icos7/2,5,6,0,4,1,3/ !Costas 7x7 tone pattern
|
|
data mode64z/-1/
|
|
save
|
|
|
|
if(mode64.ne.mode64z) then
|
|
nsync=10
|
|
inquire(file='old_qra_sync',exist=old_qra_sync)
|
|
if(old_qra_sync) nsync=1
|
|
twopi=8.0*atan(1.0)
|
|
dfgen=mode64*12000.0/6912.0
|
|
k=-1
|
|
phi=0.
|
|
do j=0,6 !Compute complex Costas waveform
|
|
dphi=twopi*nsync*icos7(j)*dfgen/6000.0
|
|
do i=1,NSPS
|
|
phi=phi + dphi
|
|
if(phi.gt.twopi) phi=phi-twopi
|
|
k=k+1
|
|
cc(k)=cmplx(cos(phi),sin(phi))
|
|
enddo
|
|
enddo
|
|
mode64z=mode64
|
|
endif
|
|
|
|
nfft1=672000
|
|
nfft2=nfft1/2
|
|
df1=12000.0/nfft1
|
|
fac=2.0/nfft1
|
|
c0(0:npts-1)=fac*dd(1:npts)
|
|
c0(npts:nfft1)=0.
|
|
call four2a(c0,nfft1,1,-1,1) !Forward c2c FFT
|
|
c0(nfft2/2+1:nfft2)=0.
|
|
c0(0)=0.5*c0(0)
|
|
call four2a(c0,nfft2,1,1,1) !Inverse c2c FFT; c0 is analytic sig
|
|
npts2=npts/2 !Downsampled complex data length
|
|
nfft3=NSPC
|
|
nh3=nfft3/2
|
|
df3=6000.0/nfft3
|
|
|
|
fa=max(nf1,nfqso-ntol)
|
|
fb=min(nf2,nfqso+ntol)
|
|
iaa=max(maxf1,nint(fa/df3))
|
|
ibb=min(NSPC-1-maxf1,nint(fb/df3))
|
|
|
|
maxtol=max(ntol,500)
|
|
fa=max(nf1,nfqso-maxtol)
|
|
fb=min(nf2,nfqso+maxtol)
|
|
ia=max(maxf1,nint(fa/df3))
|
|
ib=min(NSPC-1-maxf1,nint(fb/df3))
|
|
id=0.1*(ib-ia)
|
|
|
|
iz=ib-ia+1
|
|
sync=0.
|
|
jpk=0
|
|
ja=0
|
|
jb=6*5000
|
|
jstep=100
|
|
ka=-maxf1
|
|
kb=maxf1
|
|
ipk=0
|
|
kpk=0
|
|
! nadd=(7*mode64)/2
|
|
! nadd=7*mode64
|
|
nadd=10*mode64
|
|
if(mod(nadd,2).eq.0) nadd=nadd+1 !Make nadd odd
|
|
! nskip=max(14,2*mode64)
|
|
nskip=max(14,nadd)
|
|
|
|
do j1=ja,jb,jstep
|
|
call timer('sync64_1',0)
|
|
j2=j1 + 39*NSPS
|
|
j3=j1 + 77*NSPS
|
|
c1=1.e-4*c0(j1:j1+NSPC-1) * conjg(cc)
|
|
call four2a(c1,nfft3,1,-1,1)
|
|
c2=1.e-4*c0(j2:j2+NSPC-1) * conjg(cc)
|
|
call four2a(c2,nfft3,1,-1,1)
|
|
c3=1.e-4*c0(j3:j3+NSPC-1) * conjg(cc)
|
|
call four2a(c3,nfft3,1,-1,1)
|
|
s0=0.
|
|
s1=0.
|
|
s2=0.
|
|
s3=0.
|
|
do i=ia,ib
|
|
freq=i*df3
|
|
s1(i)=real(c1(i))**2 + aimag(c1(i))**2
|
|
s2(i)=real(c2(i))**2 + aimag(c2(i))**2
|
|
s3(i)=real(c3(i))**2 + aimag(c3(i))**2
|
|
enddo
|
|
call timer('sync64_1',1)
|
|
|
|
call timer('sync64_2',0)
|
|
do k=ka,kb
|
|
s0(ia:ib)=s1(ia-k:ib-k) + s2(ia:ib) + s3(ia+k:ib+k)
|
|
s0(:ia-1)=0.
|
|
s0(ib+1:)=0.
|
|
if(nadd.ge.3) then
|
|
do ii=1,3
|
|
s0b(ia:ib)=s0(ia:ib)
|
|
call smo(s0b(ia:ib),iz,s0(ia:ib),nadd)
|
|
|
|
enddo
|
|
endif
|
|
call smo121(s0(ia:ib),iz)
|
|
call averms(s0(ia+id:ib-id),iz-2*id,nskip,ave,rms)
|
|
s=(maxval(s0(ia:ib))-ave)/rms
|
|
ipk0=maxloc(s0(ia:ib))
|
|
ip=ipk0(1) + ia - 1
|
|
if(s.gt.sync .and. ip.ge.iaa .and. ip.le.ibb) then
|
|
jpk=j1
|
|
s0a=(s0-ave)/rms
|
|
sync=s
|
|
dtx=jpk/6000.0 - 1.0
|
|
ipk=ip
|
|
f0=ip*df3
|
|
kpk=k
|
|
endif
|
|
enddo
|
|
call timer('sync64_2',1)
|
|
enddo
|
|
sync=sync-3.5
|
|
|
|
ja=max(0,jpk-2*jstep)
|
|
jb=min(336000-NSPC,jpk+2*jstep)
|
|
jstep=10
|
|
|
|
s0a=s0a+2.0
|
|
write(17) ia,ib,s0a(ia:ib) !Save data for red curve
|
|
close(17)
|
|
|
|
return
|
|
end subroutine sync64
|