git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/map65@338 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

This commit is contained in:
Joe Taylor 2007-01-11 21:49:48 +00:00
parent bbe950c76a
commit 1f947448de
3 changed files with 125 additions and 0 deletions

68
ccf1.f Normal file
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subroutine ccf1(cx,cy,n5,nflip,a,ccfmax,dtmax)
parameter (NMAX=60*96000) !Approx samples per half symbol
complex cx(n5)
complex cy(n5)
real a(5)
complex w,wstep,za,zb,z
real ss(2600)
complex csx(0:NMAX/64),csy(0:NMAX/64)
data twopi/6.283185307/a1,a2,a3/99.,99.,99./
save
if(a(1).ne.a1 .or. a(2).ne.a2 .or. a(3).ne.a3) then
a1=a(1)
a2=a(2)
a3=a(3)
C Mix and integrate the complex X and Y signals
csx(0)=0.
csy(0)=0.
w=1.0
x0=0.5*(n5+1)
s=2.0/n5
do i=1,n5
x=s*(i-x0)
if(mod(i,1000).eq.1) then
p2=1.5*x*x - 0.5
! p3=2.5*(x**3) - 1.5*x
! p4=4.375*(x**4) - 3.75*(x**2) + 0.375
dphi=(a(1) + x*a(2) + p2*a(3)) * (twopi/1378.125)
wstep=cmplx(cos(dphi),sin(dphi))
endif
w=w*wstep
csx(i)=csx(i-1) + w*cx(i)
csy(i)=csy(i-1) + w*cy(i)
enddo
endif
C Compute 1/2-symbol powers at 1/16-symbol steps.
n6=n5/32
fac=1.e-4
pol=a(4)/57.2957795
aa=cos(pol)
bb=sin(pol)
fsample=1378.125
baud=11025.0/4096.0
nsph=nint(0.5*fsample/baud) !Samples per half symbol
do i=1,n6
j=32*i
k=j-nsph
ss(i)=0.
if(k.ge.1) then
za=csx(j)-csx(k)
zb=csy(j)-csy(k)
z=aa*za + bb*zb
ss(i)=fac*(real(z)**2 + aimag(z)**2)
endif
enddo
ccfmax=0.
call ccf2(ss,n6,nflip,ccf,lagpk)
if(ccf.gt.ccfmax) then
ccfmax=ccf
dtmax=0.5*lagpk*(512.0/11025.0)
endif
return
end

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subroutine trimlist(sig,kk,indx,nsiz,nz)
parameter (MAXMSG=1000) !Size of decoded message list
real sig(MAXMSG,30)
integer indx(MAXMSG),nsiz(MAXMSG)
data ftol/0.02/
C 1 2 3 4 5 6 7 8
C nfile nutc freq snr dt ipol flip sync
call indexx(kk,sig(1,3),indx) !Sort list by frequency
n=1
i0=1
do i=2,kk
j0=indx(i-1)
j=indx(i)
if(sig(j,3)-sig(j0,3).gt.ftol) then
nsiz(n)=i-i0
i0=i
n=n+1
endif
enddo
nz=n
nsiz(nz)=kk+1-i0
nsiz(nz+1)=-1
return
end

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twkfreq.f Normal file
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subroutine twkfreq(c4aa,c4bb,n5,a)
complex c4aa(n5)
complex c4bb(n5)
real a(5)
complex w,wstep
data twopi/6.283185307/
C Apply AFC corrections to the c4aa and c4bb data
w=1.0
x0=0.5*(n5+1)
s=2.0/n5
do i=1,n5
x=s*(i-x0)
if(mod(i,1000).eq.1) then
p2=1.5*x*x - 0.5
! p3=2.5*(x**3) - 1.5*x
! p4=4.375*(x**4) - 3.75*(x**2) + 0.375
dphi=(a(1) + x*a(2) + p2*a(3)) * (twopi/1378.125)
wstep=cmplx(cos(dphi),sin(dphi))
endif
w=w*wstep
c4aa(i)=w*c4aa(i)
c4bb(i)=w*c4bb(i)
enddo
return
end