program qratest parameter (NMAX=60*12000) real dd(NMAX) real t(5) integer*8 count0,count1,clkfreq character*8 arg nargs=iargc() 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,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 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,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 real dd(NMAX) !Raw data real x(672000) !Up to 56 s at 12000 Hz real t(5) real s0(0:NSPC-1) real s1(0:NSPC-1) real s2(0:NSPC-1) real s3(0:NSPC-1) real s0a(0:NSPC-1) integer*8 count0,count1,clkfreq integer icos7(0:6) integer ipk0(1) complex cc(0:NSPC-1) complex c0(0:336000) complex c1(0:NSPC-1) complex c2(0:NSPC-1) complex c3(0:NSPC-1) 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 system_clock(count0,clkfreq) call four2a(c0,nfft1,1,-1,0) !Forward r2c FFT call four2a(c0,nfft2,1,1,1) !Inverse c2c FFT; c0 is analytic sig call system_clock(count1,clkfreq) t(1)=float(count1-count0)/float(clkfreq) npts2=npts0/3 !Downsampled complex data length nfft3=NSPC nh3=nfft3/2 df3=4000.0/nfft3 ia=nint(nf1/df3) ib=nint(nf2/df3) iz=ib-ia+1 snr=0. jpk=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 j2=j1 + 39*2304 j3=j1 + 77*2304 c1=1.e-4*c0(j1:j1+NSPC-1) * conjg(cc) call four2a(c1,nfft3,1,-1,1) c2=1.e-4*c0(j2:j2+NSPC-1) * conjg(cc) 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 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) 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