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WSJT-X
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Speed up sync by 10x, solve for frequency drift, and improve Sync S/N estimate. 

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6938 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Joe Taylor 2016-07-22 18:52:59 +00:00
parent f60f7d2060
commit a2d961aa5a
1 changed files with 64 additions and 52 deletions
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116
lib/qratest.f90
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@ -7,35 +7,38 @@ program qratest
character*8 arg
nargs=iargc()
if(nargs.ne.2) then
print*,'Usage: qratest f0 fTol'
if(nargs.ne.3) then
print*,'Usage: qratest f0 maxf1 fTol'
go to 999
endif
call getarg(1,arg)
read(arg,*) nf0
call getarg(2,arg)
read(arg,*) maxf1
call getarg(3,arg)
read(arg,*) ntol
nf1=nf0-ntol
nf2=nf0+ntol
! do iskip=1,13
! read(60)
! enddo
do n=1,999
read(60,end=999) dd
call system_clock(count0,clkfreq)
call sync64(dd,nf1,nf2,dtx,f0,f01,f02,f03,snr,t)
call sync64(dd,nf1,nf2,maxf1,dtx,f0,kpk,snr,t)
call system_clock(count1,clkfreq)
tsec=float(count1-count0)/float(clkfreq)
! nf0=200*nint(f0/200.)
dfreq0=f0-nf0
dfreq1=f01-nf0
dfreq2=f02-nf0
dfreq3=f03-nf0
write(*,1000) dtx,f0,dfreq0,dfreq1,dfreq2,dfreq3,snr,tsec,t(1),t(2)
1000 format(f8.3,f8.2,4f7.2,f8.1,3f6.3)
write(*,1000) dtx,f0,dfreq0,kpk,snr,tsec
1000 format(f8.3,f8.2,f7.2,i4,f8.1,f7.3)
enddo
999 end program qratest
subroutine sync64(dd,nf1,nf2,dtx,f0,f01,f02,f03,snr,t)
subroutine sync64(dd,nf1,nf2,maxf1,dtx,f0,kpk,snr,t)
parameter (NMAX=60*12000) !Max size of raw data at 12000 Hz
parameter (NSPS=2304) !Samples per symbol at 4000 Hz
parameter (NSPC=7*NSPS) !Samples per Costas array
@ -49,13 +52,10 @@ subroutine sync64(dd,nf1,nf2,dtx,f0,f01,f02,f03,snr,t)
real s3(0:NSPC-1)
real s0a(0:NSPC-1)
real s1a(0:NSPC-1)
real s2a(0:NSPC-1)
real s3a(0:NSPC-1)
integer*8 count0,count1,clkfreq
integer icos7(0:6)
integer ipk(1)
integer ipk0(1)
complex cc(0:NSPC-1)
complex c0(0:336000)
@ -97,12 +97,15 @@ subroutine sync64(dd,nf1,nf2,dtx,f0,f01,f02,f03,snr,t)
ia=nint(nf1/df3)
ib=nint(nf2/df3)
iz=ib-ia+1
smax=0.
snr=0.
jpk=0
s0=0.
ja=0
jb=6*4000
jstep=200
ka=-maxf1
kb=maxf1
ipk=0
kpk=0
call system_clock(count0,clkfreq)
do iter=1,2
do j1=ja,jb,jstep
@ -114,55 +117,64 @@ subroutine sync64(dd,nf1,nf2,dtx,f0,f01,f02,f03,snr,t)
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 smo121(s1(ia:ib),iz)
call smo121(s2(ia:ib),iz)
call smo121(s3(ia:ib),iz)
s0(ia:ib)=s1(ia:ib) + s2(ia:ib) + s3(ia:ib)
s=maxval(s0(ia:ib))
if(s.gt.smax) then
jpk=j1
s0a=s0
s1a=s1
s2a=s2
s3a=s3
smax=s
dtx=jpk/4000.0 - 1.0
ipk=maxloc(s0(ia:ib))
f0=(ipk(1)+ia-1)*df3
ipk=maxloc(s1(ia:ib))
f01=(ipk(1)+ia-1)*df3
ipk=maxloc(s2(ia:ib))
f02=(ipk(1)+ia-1)*df3
ipk=maxloc(s3(ia:ib))
f03=(ipk(1)+ia-1)*df3
endif
do k=ka,kb
s0(ia:ib)=s1(ia-k:ib-k) + s2(ia:ib) + s3(ia+k:ib+k)
call smo121(s0(ia:ib),iz)
call averms(s0(ia:ib),iz,14,ave,rms)
s=(maxval(s0(ia:ib))-ave)/rms
if(s.gt.snr) then
jpk=j1
s0a=s0
snr=s
dtx=jpk/4000.0 - 1.0
ipk0=maxloc(s0(ia:ib))
ipk=ipk0(1)
f0=(ipk+ia-1)*df3
kpk=k
write(16,3101) jpk,ipk,kpk,dtx,f0,snr
3101 format(3i5,f8.3,f8.2,f10.1)
endif
enddo
enddo
ja=jpk-2*jstep
jb=jpk+2*jstep
jstep=10
! ka=kpk
! kb=kpk
enddo
call system_clock(count1,clkfreq)
t(2)=float(count1-count0)/float(clkfreq)
ave=sum(s0a(ia:ib))/iz
sq=dot_product(s0a(ia:ib),s0a(ia:ib))
rms=sqrt(sq/iz - ave*ave)
snr=(smax-ave)/rms
! do i=0,nfft3-1
! freq=i*df3
! if(freq.gt.2500.0) exit
! write(14,1020) freq,s0a(i),s1a(i),s2a(i),s3a(i)
!1020 format(f10.3,4f12.1)
! enddo
return
end subroutine sync64
subroutine averms(x,n,nskip,ave,rms)
real x(n)
integer ipk(1)
ns=0
s=0.
sq=0.
ipk=maxloc(x)
do i=1,n
if(abs(i-ipk(1)).gt.nskip) then
s=s + x(i)
sq=sq + x(i)**2
ns=ns+1
endif
enddo
ave=s/ns
rms=sqrt(sq/ns - ave*ave)
return
end subroutine averms