w4kek/WSJT-X
1
0
Fork 0
mirror of https://github.com/saitohirga/WSJT-X.git synced 2025-03-23 04:28:36 -04:00
Code Issues Packages Projects Releases Wiki Activity

Test program for improved sync detection.

Browse Source 
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6936 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Joe Taylor 2016-07-21 20:30:04 +00:00
parent 6d6fa2b4ae
commit 44d2f446a2
3 changed files with 119 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
lib/qra/qra64/qra64sim.f90
View File

@ -76,7 +76,6 @@ program qra64sim
bandwidth_ratio=2500.0/6000.0
sig=sqrt(2*bandwidth_ratio)*10.0**(0.05*xsnr)
! sig=sqrt(2.0)*10.0**(0.05*xsnr)
if(xsnr.gt.90.0) sig=1.0
write(*,1020) ifile,isig,f0,csubmode,xsnr,xdt,fspread,msg
1020 format(i4,i4,f10.3,2x,a1,2x,f5.1,f6.2,f5.1,1x,a22)

4
lib/qra64a.f90
View File

@ -2,7 +2,7 @@ subroutine qra64a(dd0,nutc,nf1,nf2,nfqso,ntol,mycall_12,hiscall_12, &
hisgrid_6,sync,nsnr,dtx,nfreq,decoded,nft)
use packjt
parameter (NFFT=2*6912,NH=NFFT/2,NZ=5760,NMAX=60*12000)
parameter (NFFT=2*6912,NZ=5760,NMAX=60*12000)
character decoded*22
character*12 mycall_12,hiscall_12
character*6 mycall,hiscall,hisgrid_6
@ -21,6 +21,8 @@ subroutine qra64a(dd0,nutc,nf1,nf2,nfqso,ntol,mycall_12,hiscall_12, &
common/qra64com/ss(NZ,194),s3(0:63,1:63),ccf(NZ,0:25)
save
! write(60) dd0
decoded=' '
nft=99
nsnr=-30

116
lib/qratest.f90 Normal file
View File

@ -0,0 +1,116 @@
program qratest
parameter (NMAX=60*12000)
real dd(NMAX)
do n=1,999
read(60,end=999) dd
call sync64(dd,dtx,f0,snr)
write(*,1000) dtx,f0,snr
1000 format('DT:',f6.2,' f0:',f7.1,' Sync S/N:',f10.1)
enddo
999 end program qratest
subroutine sync64(dd,dtx,f0,snr)
parameter (NMAX=60*12000)
real dd(NMAX)
real x(672000)
real s0(0:16127)
real s1(0:16127)
real s2(0:16127)
real s3(0:16127)
real s0a(0:16127)
real s1a(0:16127)
real s2a(0:16127)
real s3a(0:16127)
integer icos7(0:6)
integer ipk(1)
complex cc(0:16127)
complex c0(0:336000)
complex c1(0:16127)
complex c2(0:16127)
complex c3(0:16127)
equivalence (x,c0)
data icos7/2,5,6,0,4,1,3/ !Costas 7x7 pattern
twopi=8.0*atan(1.0)
dfgen=12000.0/6912.0
k=-1
phi=0.
do j=0,6
dphi=twopi*icos7(j)*dfgen/4000.0
do i=1,2304
phi=phi + dphi
if(phi.gt.twopi) phi=phi-twopi
k=k+1
cc(k)=cmplx(cos(phi),sin(phi))
enddo
enddo
npts0=54*12000
nfft1=672000
nfft2=nfft1/3
df1=12000.0/nfft1
fac=2.0/nfft1
x=fac*dd(1:nfft1)
call four2a(c0,nfft1,1,-1,0) !Forward r2c FFT
call four2a(c0,nfft2,1,1,1) !Inverse c2c FFT
npts2=npts0/3 !Downsampled complex data length
nfft3=16128
nh3=nfft3/2
df3=4000.0/nfft3
iz=750.0/df3
smax=0.
jpk=0
do j1=0,24000,20
j2=j1 + 39*2304
j3=j1 + 77*2304
c1=1.e-4*c0(j1:j1+16127) * conjg(cc)
call four2a(c1,nfft3,1,-1,1)
c2=1.e-4*c0(j2:j2+16127) * conjg(cc)
call four2a(c2,nfft3,1,-1,1)
c3=1.e-4*c0(j3:j3+16127) * conjg(cc)
call four2a(c3,nfft3,1,-1,1)
do i=0,nfft3-1
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,nfft3)
call smo121(s2,nfft3)
call smo121(s3,nfft3)
s0=s1+s2+s3
s=maxval(s0)
if(s.gt.smax) then
jpk=j1
s0a=s0
s1a=s1
s2a=s2
s3a=s3
smax=s
ipk=maxloc(s0)
dtx=jpk/4000.0 - 1.0
f0=(ipk(1)-1)*df3
endif
enddo
sq=dot_product(s0a,s0a)
ave=sum(s0a)/nfft3
rms=sqrt(sq/nfft3 - 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
end subroutine sync64