mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-06 01:11:18 -05:00
170 lines
4.4 KiB
Fortran
170 lines
4.4 KiB
Fortran
subroutine sync64(c0,nf1,nf2,nfqso,ntol,mode64,emedelay,dtx,f0,jpk,sync, &
|
|
sync2,width)
|
|
|
|
! 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 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
|
|
real a(5)
|
|
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
|
|
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*10.0*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
|
|
|
|
nfft3=NSPC
|
|
nh3=nfft3/2
|
|
df3=6000.0/nfft3
|
|
|
|
faa=nfqso-ntol
|
|
fbb=nfqso+ntol
|
|
iaa=max(0,nint(faa/df3)+nh3)
|
|
ibb=min(NSPC-1,nint(fbb/df3)+nh3)
|
|
|
|
fa=-3000.0
|
|
fb=3000.0
|
|
ia=max(0,nint(fa/df3)+nh3)
|
|
ib=min(NSPC-1,nint(fb/df3)+nh3)
|
|
|
|
id=0.1*(ib-ia)
|
|
iz=ib-ia+1
|
|
sync=-1.e30
|
|
smaxall=0.
|
|
jpk=0
|
|
ja=0
|
|
jb=(5.0+emedelay)*6000
|
|
! jstep=100
|
|
jstep=200
|
|
ipk=0
|
|
kpk=0
|
|
nadd=10*mode64
|
|
if(mod(nadd,2).eq.0) nadd=nadd+1 !Make nadd odd
|
|
nskip=max(49,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)
|
|
c2=1.e-4*c0(j2:j2+NSPC-1) * conjg(cc)
|
|
c3=1.e-4*c0(j3:j3+NSPC-1) * conjg(cc)
|
|
call four2a(c1,nfft3,1,-1,1)
|
|
call four2a(c2,nfft3,1,-1,1)
|
|
call four2a(c3,nfft3,1,-1,1)
|
|
c1=cshift(c1,nh3)
|
|
c2=cshift(c2,nh3)
|
|
c3=cshift(c3,nh3)
|
|
s1=0.
|
|
s2=0.
|
|
s3=0.
|
|
s0b=0.
|
|
do i=ia,ib
|
|
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)
|
|
s0(ia:ib)=s1(ia:ib) + s2(ia:ib) + s3(ia:ib)
|
|
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 averms(s0(ia+id:ib-id),iz-2*id,nskip,ave,rms)
|
|
s=(maxval(s0(iaa:ibb))-ave)/rms
|
|
ipk0=maxloc(s0(iaa:ibb))
|
|
ip=ipk0(1) + iaa - 1
|
|
if(s.gt.sync) then
|
|
jpk=j1
|
|
s0a=(s0-ave)/rms
|
|
sync=s
|
|
dtx=jpk/6000.0 - 1.0
|
|
ipk=ip
|
|
f0=ip*df3 - 3000.0
|
|
! rewind 61
|
|
! do i=iaa,ibb
|
|
! write(61,3301) i*df3-3000.0,s0(i),s1(i),s2(i),s3(i)
|
|
!3301 format(5f12.3)
|
|
! enddo
|
|
! flush(61)
|
|
endif
|
|
call timer('sync64_2',1)
|
|
enddo
|
|
|
|
nskip=50
|
|
call lorentzian(s0a(ia+nskip:ib-nskip),iz-2*nskip,a)
|
|
f0a=(a(3)+ia+49)*df3
|
|
w1=df3*a(4)
|
|
w2=2*nadd*df3
|
|
width=w1
|
|
if(w1.gt.1.2*w2) width=sqrt(w1**2 - w2**2)
|
|
|
|
sq=0.
|
|
do i=1,20
|
|
j=ia+nskip+1
|
|
k=ib-nskip-21+i
|
|
sq=sq + (s0a(j)-a(1))**2 + (s0a(k)-a(1))**2
|
|
enddo
|
|
rms2=sqrt(sq/40.0)
|
|
sync2=10.0*log10(a(2)/rms2)
|
|
|
|
slimit=6.0
|
|
rewind 17
|
|
write(17,1110) 0.0,0.0
|
|
rewind 17
|
|
! rewind 76
|
|
do i=2,iz-2*nskip-1,3
|
|
x=i
|
|
z=(x-a(3))/(0.5*a(4))
|
|
yfit=a(1)
|
|
if(abs(z).lt.3.0) then
|
|
d=1.0 + z*z
|
|
yfit=a(1) + a(2)*(1.0/d - 0.1)
|
|
endif
|
|
j=i+ia+49
|
|
freq=j*df3-3000.0
|
|
ss=(s0a(j-1)+s0a(j)+s0a(j+1))/3.0
|
|
if(ss.gt.slimit) write(17,1110) freq,ss
|
|
1110 format(3f10.3)
|
|
! write(76,1110) freq,ss,yfit
|
|
enddo
|
|
flush(17)
|
|
! flush(76)
|
|
|
|
return
|
|
end subroutine sync64
|