mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-09-07 22:06:38 -04:00
f60f7d2060
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6937 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
169 lines
4.1 KiB
Fortran
169 lines
4.1 KiB
Fortran
program qratest
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parameter (NMAX=60*12000)
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real dd(NMAX)
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real t(5)
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integer*8 count0,count1,clkfreq
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character*8 arg
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nargs=iargc()
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if(nargs.ne.2) then
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print*,'Usage: qratest f0 fTol'
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go to 999
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endif
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call getarg(1,arg)
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read(arg,*) nf0
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call getarg(2,arg)
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read(arg,*) ntol
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nf1=nf0-ntol
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nf2=nf0+ntol
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do n=1,999
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read(60,end=999) dd
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call system_clock(count0,clkfreq)
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call sync64(dd,nf1,nf2,dtx,f0,f01,f02,f03,snr,t)
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call system_clock(count1,clkfreq)
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tsec=float(count1-count0)/float(clkfreq)
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! nf0=200*nint(f0/200.)
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dfreq0=f0-nf0
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dfreq1=f01-nf0
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dfreq2=f02-nf0
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dfreq3=f03-nf0
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write(*,1000) dtx,f0,dfreq0,dfreq1,dfreq2,dfreq3,snr,tsec,t(1),t(2)
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1000 format(f8.3,f8.2,4f7.2,f8.1,3f6.3)
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enddo
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999 end program qratest
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subroutine sync64(dd,nf1,nf2,dtx,f0,f01,f02,f03,snr,t)
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parameter (NMAX=60*12000) !Max size of raw data at 12000 Hz
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parameter (NSPS=2304) !Samples per symbol at 4000 Hz
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parameter (NSPC=7*NSPS) !Samples per Costas array
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real dd(NMAX) !Raw data
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real x(672000) !Up to 56 s at 12000 Hz
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real t(5)
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real s0(0:NSPC-1)
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real s1(0:NSPC-1)
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real s2(0:NSPC-1)
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real s3(0:NSPC-1)
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real s0a(0:NSPC-1)
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real s1a(0:NSPC-1)
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real s2a(0:NSPC-1)
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real s3a(0:NSPC-1)
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integer*8 count0,count1,clkfreq
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integer icos7(0:6)
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integer ipk(1)
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complex cc(0:NSPC-1)
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complex c0(0:336000)
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complex c1(0:NSPC-1)
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complex c2(0:NSPC-1)
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complex c3(0:NSPC-1)
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equivalence (x,c0)
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data icos7/2,5,6,0,4,1,3/ !Costas 7x7 pattern
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twopi=8.0*atan(1.0)
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dfgen=12000.0/6912.0
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k=-1
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phi=0.
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do j=0,6
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dphi=twopi*icos7(j)*dfgen/4000.0
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do i=1,2304
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phi=phi + dphi
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if(phi.gt.twopi) phi=phi-twopi
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k=k+1
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cc(k)=cmplx(cos(phi),sin(phi))
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enddo
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enddo
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npts0=54*12000
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nfft1=672000
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nfft2=nfft1/3
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df1=12000.0/nfft1
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fac=2.0/nfft1
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x=fac*dd(1:nfft1)
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call system_clock(count0,clkfreq)
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call four2a(c0,nfft1,1,-1,0) !Forward r2c FFT
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call four2a(c0,nfft2,1,1,1) !Inverse c2c FFT; c0 is analytic sig
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call system_clock(count1,clkfreq)
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t(1)=float(count1-count0)/float(clkfreq)
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npts2=npts0/3 !Downsampled complex data length
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nfft3=NSPC
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nh3=nfft3/2
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df3=4000.0/nfft3
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ia=nint(nf1/df3)
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ib=nint(nf2/df3)
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iz=ib-ia+1
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smax=0.
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jpk=0
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s0=0.
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ja=0
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jb=6*4000
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jstep=200
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call system_clock(count0,clkfreq)
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do iter=1,2
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do j1=ja,jb,jstep
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j2=j1 + 39*2304
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j3=j1 + 77*2304
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c1=1.e-4*c0(j1:j1+NSPC-1) * conjg(cc)
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call four2a(c1,nfft3,1,-1,1)
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c2=1.e-4*c0(j2:j2+NSPC-1) * conjg(cc)
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call four2a(c2,nfft3,1,-1,1)
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c3=1.e-4*c0(j3:j3+NSPC-1) * conjg(cc)
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call four2a(c3,nfft3,1,-1,1)
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do i=ia,ib
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freq=i*df3
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s1(i)=real(c1(i))**2 + aimag(c1(i))**2
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s2(i)=real(c2(i))**2 + aimag(c2(i))**2
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s3(i)=real(c3(i))**2 + aimag(c3(i))**2
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enddo
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call smo121(s1(ia:ib),iz)
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call smo121(s2(ia:ib),iz)
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call smo121(s3(ia:ib),iz)
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s0(ia:ib)=s1(ia:ib) + s2(ia:ib) + s3(ia:ib)
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s=maxval(s0(ia:ib))
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if(s.gt.smax) then
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jpk=j1
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s0a=s0
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s1a=s1
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s2a=s2
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s3a=s3
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smax=s
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dtx=jpk/4000.0 - 1.0
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ipk=maxloc(s0(ia:ib))
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f0=(ipk(1)+ia-1)*df3
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ipk=maxloc(s1(ia:ib))
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f01=(ipk(1)+ia-1)*df3
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ipk=maxloc(s2(ia:ib))
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f02=(ipk(1)+ia-1)*df3
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ipk=maxloc(s3(ia:ib))
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f03=(ipk(1)+ia-1)*df3
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endif
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enddo
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ja=jpk-2*jstep
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jb=jpk+2*jstep
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jstep=10
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enddo
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call system_clock(count1,clkfreq)
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t(2)=float(count1-count0)/float(clkfreq)
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ave=sum(s0a(ia:ib))/iz
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sq=dot_product(s0a(ia:ib),s0a(ia:ib))
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rms=sqrt(sq/iz - ave*ave)
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snr=(smax-ave)/rms
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! do i=0,nfft3-1
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! freq=i*df3
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! if(freq.gt.2500.0) exit
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! write(14,1020) freq,s0a(i),s1a(i),s2a(i),s3a(i)
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!1020 format(f10.3,4f12.1)
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! enddo
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end subroutine sync64
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