subroutine sync64(c0,nf1,nf2,nfqso,ntol,mode64,dtx,f0,jpk,sync,sync2,width) use timer_module, only: timer parameter (NMAX=60*12000) !Max size of raw data at 12000 Hz parameter (NSPS=3456) !Samples per symbol at 6000 Hz parameter (NSPC=7*NSPS) !Samples per Costas array real s1(0:NSPC-1) !Power spectrum of Costas 1 real s2(0:NSPC-1) !Power spectrum of Costas 2 real s3(0:NSPC-1) !Power spectrum of Costas 3 real s0(0:NSPC-1) !Sum of s1+s2+s3 real s0a(0:NSPC-1) !Best synchromized spectrum (saved) real s0b(0:NSPC-1) !tmp real a(5) integer icos7(0:6) !Costas 7x7 tones integer ipk0(1) complex cc(0:NSPC-1) !Costas waveform complex c0(0:720000) !Complex spectrum of dd() complex c1(0:NSPC-1) !Complex spectrum of Costas 1 complex c2(0:NSPC-1) !Complex spectrum of Costas 2 complex c3(0:NSPC-1) !Complex spectrum of Costas 3 data icos7/2,5,6,0,4,1,3/ !Costas 7x7 tone pattern data mode64z/-1/ save if(mode64.ne.mode64z) then twopi=8.0*atan(1.0) dfgen=mode64*12000.0/6912.0 k=-1 phi=0. do j=0,6 !Compute complex Costas waveform dphi=twopi*10.0*icos7(j)*dfgen/6000.0 do i=1,NSPS phi=phi + dphi if(phi.gt.twopi) phi=phi-twopi k=k+1 cc(k)=cmplx(cos(phi),sin(phi)) enddo enddo mode64z=mode64 endif nfft3=NSPC nh3=nfft3/2 df3=6000.0/nfft3 fa=max(nf1,nfqso-ntol) fb=min(nf2,nfqso+ntol) iaa=max(0,nint(fa/df3)) ibb=min(NSPC-1,nint(fb/df3)) maxtol=max(ntol,500) fa=max(nf1,nfqso-maxtol) fb=min(nf2,nfqso+maxtol) ia=max(0,nint(fa/df3)) ib=min(NSPC-1,nint(fb/df3)) id=0.1*(ib-ia) iz=ib-ia+1 sync=-1.e30 smaxall=0. jpk=0 ja=0 jb=7.5*6000 jstep=100 ipk=0 kpk=0 nadd=10*mode64 if(mod(nadd,2).eq.0) nadd=nadd+1 !Make nadd odd nskip=max(49,nadd) do j1=ja,jb,jstep call timer('sync64_1',0) j2=j1 + 39*NSPS j3=j1 + 77*NSPS c1=1.e-4*c0(j1:j1+NSPC-1) * conjg(cc) c2=1.e-4*c0(j2:j2+NSPC-1) * conjg(cc) c3=1.e-4*c0(j3:j3+NSPC-1) * conjg(cc) call four2a(c1,nfft3,1,-1,1) call four2a(c2,nfft3,1,-1,1) call four2a(c3,nfft3,1,-1,1) s1=0. s2=0. s3=0. s0b=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 timer('sync64_1',1) call timer('sync64_2',0) s0(ia:ib)=s1(ia:ib) + s2(ia:ib) + s3(ia:ib) s0(:ia-1)=0. s0(ib+1:)=0. if(nadd.ge.3) then do ii=1,3 s0b(ia:ib)=s0(ia:ib) call smo(s0b(ia:ib),iz,s0(ia:ib),nadd) enddo endif if(j1.eq.ja) then call averms(s0(ia+id:ib-id),iz-2*id,nskip,ave,rms) endif s=(maxval(s0(iaa:ibb))-ave)/rms ipk0=maxloc(s0(iaa:ibb)) ip=ipk0(1) + iaa - 1 if(s.gt.sync) then jpk=j1 s0a=(s0-ave)/rms sync=s dtx=jpk/6000.0 - 1.0 ipk=ip f0=ip*df3 endif call timer('sync64_2',1) enddo s0a=s0a+2.0 write(17) ia,ib,s0a(ia:ib) !Save data for red curve close(17) nskip=50 call lorentzian(s0a(ia+nskip:ib-nskip),iz-2*nskip,a) f0a=(a(3)+ia+49)*df3 w1=df3*a(4) w2=2*nadd*df3 width=w1 if(w1.gt.1.2*w2) width=sqrt(w1**2 - w2**2) sq=0. do i=1,20 j=ia+nskip+1 k=ib-nskip-21+i sq=sq + (s0a(j)-a(1))**2 + (s0a(k)-a(1))**2 enddo rms2=sqrt(sq/40.0) sync2=10.0*log10(a(2)/rms2) ! do i=1,iz-2*nskip ! x=i ! z=(x-a(3))/(0.5*a(4)) ! yfit=a(1) ! if(abs(z).lt.3.0) then ! d=1.0 + z*z ! yfit=a(1) + a(2)*(1.0/d - 0.1) ! endif ! j=i+ia+49 ! write(76,1110) j*df3,s0a(j),yfit !1110 format(3f10.3) ! enddo return end subroutine sync64