2016-10-02 01:43:31 +00:00
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subroutine msk40sync(cdat,nframes,ntol,delf,navmask,npeaks,fc,fest, &
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npklocs,nsuccess,c)
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!$ use omp_lib
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parameter (NSPM=240)
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complex cdat(NSPM*nframes)
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complex cdat2(NSPM*nframes,8)
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complex c(NSPM) !Coherently averaged complex data
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complex cs(NSPM,8)
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complex cb(42) !Complex waveform for sync word
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integer s8r(8)
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integer iloc(1)
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integer npklocs(npeaks)
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integer navmask(nframes) ! defines which frames to average
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real cbi(42),cbq(42)
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real pkamps(npeaks)
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real xcc(0:NSPM-1)
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real xccs(0:NSPM-1,8)
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real xm(8)
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real bf(8)
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real pp(12) !Half-sine pulse shape
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logical first
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data first/.true./
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2016-10-03 20:18:53 +00:00
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data s8r/1,0,1,1,0,0,0,1/
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save first,cb,fs,pi,twopi,dt,s8r,pp
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2016-10-02 01:43:31 +00:00
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if(first) then
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pi=4.0*atan(1.0)
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twopi=8.0*atan(1.0)
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fs=12000.0
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dt=1.0/fs
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do i=1,12 !Define half-sine pulse
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angle=(i-1)*pi/12.0
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pp(i)=sin(angle)
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enddo
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! Define the sync word waveforms
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s8r=2*s8r-1
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cbq(1:6)=pp(7:12)*s8r(1)
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cbq(7:18)=pp*s8r(3)
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cbq(19:30)=pp*s8r(5)
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cbq(31:42)=pp*s8r(7)
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cbi(1:12)=pp*s8r(2)
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cbi(13:24)=pp*s8r(4)
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cbi(25:36)=pp*s8r(6)
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cbi(37:42)=pp(1:6)*s8r(8)
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cb=cmplx(cbi,cbq)
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first=.false.
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endif
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nfreqs=2*nint(ntol/delf) + 1
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xm=0.0
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bf=0.0
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nthreads=1
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!$ nthreads=min(8,int(OMP_GET_MAX_THREADS(),4))
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nstep=nfreqs/nthreads
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!$OMP PARALLEL NUM_THREADS(nthreads) PRIVATE(id,if1,if2)
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id=1
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!$ id=OMP_GET_THREAD_NUM() + 1 !Thread id = 1,2,...
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if1=-nint(ntol/delf) + (id-1)*nstep
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if2=if1+nstep-1
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if(id.eq.nthreads) if2=nint(ntol/delf)
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call msk40_freq_search(cdat,fc,if1,if2,delf,nframes,navmask,cb, &
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cdat2(1,id),xm(id),bf(id),cs(1,id),xccs(1,id))
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! write(73,3002) id,if1,if2,nfreqs,nthreads,bf(id),xm(id)
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!3002 format(5i5,2f10.3)
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!$OMP END PARALLEL
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xmax=xm(1)
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fest=fc+bf(1)
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c=cs(1:NSPM,1)
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xcc=xccs(0:NSPM-1,1)
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if(nthreads.gt.1) then
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do i=2,nthreads
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if(xm(i).gt.xmax) then
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xmax=xm(i)
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fest=fc+bf(i)
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c=cs(1:NSPM,i)
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xcc=xccs(0:NSPM-1,i)
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endif
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enddo
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endif
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! Find npeaks largest peaks
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do ipk=1,npeaks
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iloc=maxloc(xcc)
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ic2=iloc(1)
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npklocs(ipk)=ic2
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pkamps(ipk)=xcc(ic2-1)
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xcc(max(0,ic2-7):min(NSPM-1,ic2+7))=0.0
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enddo
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2016-10-03 20:18:53 +00:00
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nsuccess=0
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if( xmax .ge. 1.3 ) nsuccess=1
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2016-10-02 01:43:31 +00:00
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return
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end subroutine msk40sync
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