mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2025-05-30 05:12:26 -04:00
More work on real time decoder.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7105 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke
parent
5df0bbcd50
commit
be0c4f15c1
@ -67,7 +67,7 @@ subroutine hspec(id2,k,nutc0,ntrperiod,ntol,bmsk144,ingain,green,s,jh,line1)
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!###
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!###
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if(bmsk144) then
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if(bmsk144) then
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if(k.ge.7168) then
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if(k.ge.7168) then
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tsec=(k-3584)/12000.0
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tsec=(k-7168)/12000.0
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call mskrtd(id2(k-7168+1:k),nutc0,tsec,ntol,line1)
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call mskrtd(id2(k-7168+1:k),nutc0,tsec,ntol,line1)
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endif
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endif
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endif
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endif
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@ -84,9 +84,9 @@ program msk144d2
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call timer('read ',1)
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call timer('read ',1)
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do i=1,npts,7*512
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do i=1,npts,7*512
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ichunk=id2(i:i+7*1024-1)
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ichunk=id2(i:i+7*1024-1)
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tsec=(i-1+7*512)/12000.0
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tsec=(i-1)/12000.0
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call mskrtd(ichunk,nutc,tsec,ntol,line)
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call mskrtd(ichunk,nutc,tsec,ntol,line)
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if( line .ne. ' ' ) then
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if( index(line,"^") .ne. 0 .or. index(line,"&") .ne. 0 ) then
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write(*,*) line
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write(*,*) line
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endif
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endif
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enddo
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enddo
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@ -1,5 +1,5 @@
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subroutine msk144decodeframe(c,msgreceived,nsuccess)
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subroutine msk144decodeframe(c,msgreceived,nsuccess)
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use timer_module, only: timer
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! use timer_module, only: timer
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parameter (NSPM=864)
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parameter (NSPM=864)
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character*22 msgreceived
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character*22 msgreceived
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@ -16,10 +16,9 @@ subroutine msk144decodeframe(c,msgreceived,nsuccess)
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logical first
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logical first
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data first/.true./
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data first/.true./
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data s8/0,1,1,1,0,0,1,0/
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data s8/0,1,1,1,0,0,1,0/
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save df,first,cb,fs,pi,twopi,dt,s8,pp,nmatchedfilter
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save df,first,cb,fs,pi,twopi,dt,s8,pp
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if(first) then
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if(first) then
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nmatchedfilter=1
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! define half-sine pulse and raised-cosine edge window
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! define half-sine pulse and raised-cosine edge window
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pi=4d0*datan(1d0)
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pi=4d0*datan(1d0)
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twopi=8d0*datan(1d0)
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twopi=8d0*datan(1d0)
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@ -95,9 +94,9 @@ subroutine msk144decodeframe(c,msgreceived,nsuccess)
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max_iterations=10
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max_iterations=10
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max_dither=1
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max_dither=1
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call timer('bpdec144 ',0)
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! call timer('bpdec144 ',0)
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call bpdecode144(llr,max_iterations,decoded,niterations)
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call bpdecode144(llr,max_iterations,decoded,niterations)
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call timer('bpdec144 ',1)
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! call timer('bpdec144 ',1)
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if( niterations .ge. 0.0 ) then
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if( niterations .ge. 0.0 ) then
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call extractmessage144(decoded,msgreceived,nhashflag)
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call extractmessage144(decoded,msgreceived,nhashflag)
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312
lib/msk144spd.f90
Normal file
312
lib/msk144spd.f90
Normal file
@ -0,0 +1,312 @@
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subroutine msk144spd(cbig,n,ntol,nsuccess,msgreceived,fret,snrret,tret)
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! msk144 short-ping-decoder
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use timer_module, only: timer
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parameter (NSPM=864, NPTS=3*NSPM, MAXSTEPS=1700, NFFT=NSPM, MAXCAND=5)
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character*22 msgreceived
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complex cbig(n)
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complex cdat(NPTS) !Analytic signal
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complex cdat2(NPTS)
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complex c(NSPM)
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complex ctmp(NFFT)
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complex cb(42) !Complex waveform for sync word
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complex cbr(42) !Complex waveform for reversed sync word
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complex cfac,cca,ccb
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complex cc(NPTS)
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complex ccr(NPTS)
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complex cc1(NPTS)
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complex cc2(NPTS)
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complex ccr1(NPTS)
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complex ccr2(NPTS)
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complex bb(6)
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integer s8(8),s8r(8)
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integer, dimension(1) :: iloc
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integer indices(MAXSTEPS)
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integer ipeaks(10)
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logical ismask(NFFT)
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real cbi(42),cbq(42)
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real detmet(-2:MAXSTEPS+3)
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real detmet2(-2:MAXSTEPS+3)
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real detfer(MAXSTEPS)
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real rcw(12)
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real dd(NPTS)
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real ferrs(MAXCAND)
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real pp(12) !Half-sine pulse shape
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real snrs(MAXCAND)
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real times(MAXCAND)
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real tonespec(NFFT)
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real*8 dt, df, fs, pi, twopi
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logical first
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data first/.true./
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data s8/0,1,1,1,0,0,1,0/
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data s8r/1,0,1,1,0,0,0,1/
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save df,first,cb,fs,pi,twopi,dt,s8,rcw,pp,nmatchedfilter
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if(first) then
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nmatchedfilter=1
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! define half-sine pulse and raised-cosine edge window
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pi=4d0*datan(1d0)
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twopi=8d0*datan(1d0)
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fs=12000.0
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dt=1.0/fs
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df=fs/NFFT
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do i=1,12
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angle=(i-1)*pi/12.0
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pp(i)=sin(angle)
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rcw(i)=(1-cos(angle))/2
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enddo
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! define the sync word waveforms
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s8=2*s8-1
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cbq(1:6)=pp(7:12)*s8(1)
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cbq(7:18)=pp*s8(3)
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cbq(19:30)=pp*s8(5)
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cbq(31:42)=pp*s8(7)
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cbi(1:12)=pp*s8(2)
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cbi(13:24)=pp*s8(4)
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cbi(25:36)=pp*s8(6)
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cbi(37:42)=pp(1:6)*s8(8)
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cb=cmplx(cbi,cbq)
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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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cbr=cmplx(cbi,cbq)
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first=.false.
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endif
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! fill the detmet, detferr arrays
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nstep=(n-NPTS)/216 ! 72ms/4=18ms steps
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detmet=0
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detmet2=0
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detfer=-999.99
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do istp=1,nstep
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ns=1+216*(istp-1)
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ne=ns+NSPM-1
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if( ne .gt. n ) exit
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ctmp=cmplx(0.0,0.0)
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ctmp(1:NSPM)=cbig(ns:ne)
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! Coarse carrier frequency sync - seek tones at 2000 Hz and 4000 Hz in
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! squared signal spectrum.
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! search range for coarse frequency error is +/- 100 Hz
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ctmp=ctmp**2
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ctmp(1:12)=ctmp(1:12)*rcw
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ctmp(NSPM-11:NSPM)=ctmp(NSPM-11:NSPM)*rcw(12:1:-1)
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call four2a(ctmp,NFFT,1,-1,1)
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tonespec=abs(ctmp)**2
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ihlo=(4000-2*ntol)/df+1
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ihhi=(4000+2*ntol)/df+1
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ismask=.false.
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ismask(ihlo:ihhi)=.true. ! high tone search window
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iloc=maxloc(tonespec,ismask)
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ihpk=iloc(1)
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deltah=-real( (ctmp(ihpk-1)-ctmp(ihpk+1)) / (2*ctmp(ihpk)-ctmp(ihpk-1)-ctmp(ihpk+1)) )
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ah=tonespec(ihpk)
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ahavp=(sum(tonespec,ismask)-ah)/count(ismask)
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trath=ah/(ahavp+0.01)
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illo=(2000-2*ntol)/df+1
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ilhi=(2000+2*ntol)/df+1
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ismask=.false.
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ismask(illo:ilhi)=.true. ! window for low tone
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iloc=maxloc(tonespec,ismask)
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ilpk=iloc(1)
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deltal=-real( (ctmp(ilpk-1)-ctmp(ilpk+1)) / (2*ctmp(ilpk)-ctmp(ilpk-1)-ctmp(ilpk+1)) )
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al=tonespec(ilpk)
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alavp=(sum(tonespec,ismask)-al)/count(ismask)
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tratl=al/(alavp+0.01)
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fdiff=(ihpk+deltah-ilpk-deltal)*df
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i2000=2000/df+1
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i4000=4000/df+1
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ferrh=(ihpk+deltah-i4000)*df/2.0
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ferrl=(ilpk+deltal-i2000)*df/2.0
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if( ah .ge. al ) then
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ferr=ferrh
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else
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ferr=ferrl
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endif
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detmet(istp)=max(ah,al)
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detmet2(istp)=max(trath,tratl)
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detfer(istp)=ferr
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enddo ! end of detection-metric and frequency error estimation loop
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call indexx(detmet(1:nstep),nstep,indices) !find median of detection metric vector
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xmed=detmet(indices(nstep/4))
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detmet=detmet/xmed ! noise floor of detection metric is 1.0
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ndet=0
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do ip=1,MAXCAND ! Find candidates
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iloc=maxloc(detmet(1:nstep))
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il=iloc(1)
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! if( (detmet(il) .lt. 4.0) ) exit
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if( (detmet(il) .lt. 3.0) ) exit
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if( abs(detfer(il)) .le. ntol ) then
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ndet=ndet+1
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times(ndet)=((il-1)*216+NSPM/2)*dt
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ferrs(ndet)=detfer(il)
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snrs(ndet)=12.0*log10(detmet(il))/2-9.0
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endif
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! detmet(max(1,il-1):min(nstep,il+1))=0.0
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detmet(il)=0.0
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enddo
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if( ndet .lt. 3 ) then
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do ip=1,MAXCAND-ndet ! Find candidates
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iloc=maxloc(detmet2(1:nstep))
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il=iloc(1)
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if( (detmet2(il) .lt. 12.0) ) exit
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if( abs(detfer(il)) .le. ntol ) then
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ndet=ndet+1
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times(ndet)=((il-1)*216+NSPM/2)*dt
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ferrs(ndet)=detfer(il)
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snrs(ndet)=12.0*log10(detmet2(il))/2-9.0
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endif
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! detmet2(max(1,il-1):min(nstep,il+1))=0.0
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detmet2(il)=0.0
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enddo
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endif
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nsuccess=0
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msgreceived=' '
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do ip=1,ndet ! Try to sync/demod/decode each candidate.
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imid=times(ip)*fs
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if( imid .lt. NPTS/2 ) imid=NPTS/2
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if( imid .gt. n-NPTS/2 ) imid=n-NPTS/2
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cdat=cbig(imid-NPTS/2+1:imid+NPTS/2)
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ferr=ferrs(ip)
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! remove coarse freq error - should now be within a few Hz
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call tweak1(cdat,NPTS,-(1500+ferr),cdat)
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! attempt frame synchronization
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! correlate with sync word waveforms
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cc=0
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ccr=0
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cc1=0
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cc2=0
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ccr1=0
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ccr2=0
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do i=1,NPTS-(56*6+41)
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cc1(i)=sum(cdat(i:i+41)*conjg(cb))
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cc2(i)=sum(cdat(i+56*6:i+56*6+41)*conjg(cb))
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enddo
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cc=cc1+cc2
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dd=abs(cc1)*abs(cc2)
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cmax=maxval(abs(cc))
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! Find 6 largest peaks
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do ipk=1, 6
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iloc=maxloc(abs(cc))
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ic1=iloc(1)
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iloc=maxloc(dd)
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ic2=iloc(1)
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ipeaks(ipk)=ic2
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dd(max(1,ic2-7):min(NPTS-56*6-41,ic2+7))=0.0
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enddo
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do ipk=1,4
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! we want ic to be the index of the first sample of the frame
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ic0=ipeaks(ipk)
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! fine adjustment of sync index
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do i=1,6
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if( ic0+11+NSPM .le. NPTS ) then
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bb(i) = sum( ( cdat(ic0+i-1+6:ic0+i-1+6+NSPM:6) * conjg( cdat(ic0+i-1:ic0+i-1+NSPM:6) ) )**2 )
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else
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bb(i) = sum( ( cdat(ic0+i-1+6:NPTS:6) * conjg( cdat(ic0+i-1:NPTS-6:6) ) )**2 )
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endif
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enddo
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iloc=maxloc(abs(bb))
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ibb=iloc(1)
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bba=abs(bb(ibb))
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bbp=atan2(-imag(bb(ibb)),-real(bb(ibb)))/(2*twopi*6*dt)
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if( ibb .le. 3 ) ibb=ibb-1
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if( ibb .gt. 3 ) ibb=ibb-7
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do id=1,3 ! Slicer dither.
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if( id .eq. 1 ) is=0
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if( id .eq. 2 ) is=-1
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if( id .eq. 3 ) is=1
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! Adjust frame index to place peak of bb at desired lag
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ic=ic0+ibb+is
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if( ic .lt. 1 ) ic=ic+864
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! Estimate fine frequency error.
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! Should a larger separation be used when frames are averaged?
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cca=sum(cdat(ic:ic+41)*conjg(cb))
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if( ic+56*6+41 .le. NPTS ) then
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ccb=sum(cdat(ic+56*6:ic+56*6+41)*conjg(cb))
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cfac=ccb*conjg(cca)
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ferr2=atan2(imag(cfac),real(cfac))/(twopi*56*6*dt)
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else
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ccb=sum(cdat(ic-88*6:ic-88*6+41)*conjg(cb))
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cfac=cca*conjg(ccb)
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ferr2=atan2(imag(cfac),real(cfac))/(twopi*88*6*dt)
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endif
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! Final estimate of the carrier frequency - returned to the calling program
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fest=1500+ferr+ferr2
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do idf=0,4 ! frequency jitter
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if( idf .eq. 0 ) then
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deltaf=0.0
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elseif( mod(idf,2) .eq. 0 ) then
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deltaf=idf
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else
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deltaf=-(idf+1)
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endif
|
||||||
|
|
||||||
|
! Remove fine frequency error
|
||||||
|
call tweak1(cdat,NPTS,-(ferr2+deltaf),cdat2)
|
||||||
|
|
||||||
|
! place the beginning of frame at index NSPM+1
|
||||||
|
cdat2=cshift(cdat2,ic-(NSPM+1))
|
||||||
|
|
||||||
|
do iav=1,7 ! Hopefully we can eliminate some of these after looking at more examples
|
||||||
|
if( iav .eq. 1 ) then
|
||||||
|
c=cdat2(NSPM+1:2*NSPM)
|
||||||
|
elseif( iav .eq. 2 ) then
|
||||||
|
c=cdat2(NSPM-431:NSPM+432)
|
||||||
|
c=cshift(c,-432)
|
||||||
|
elseif( iav .eq. 3 ) then
|
||||||
|
c=cdat2(2*NSPM-431:2*NSPM+432)
|
||||||
|
c=cshift(c,-432)
|
||||||
|
elseif( iav .eq. 4 ) then
|
||||||
|
c=cdat2(1:NSPM)
|
||||||
|
elseif( iav .eq. 5 ) then
|
||||||
|
c=cdat2(2*NSPM+1:NPTS)
|
||||||
|
elseif( iav .eq. 6 ) then
|
||||||
|
c=cdat2(1:NSPM)+cdat2(NSPM+1:2*NSPM)
|
||||||
|
elseif( iav .eq. 7 ) then
|
||||||
|
c=cdat2(NSPM+1:2*NSPM)+cdat2(2*NSPM+1:NPTS)
|
||||||
|
elseif( iav .eq. 8 ) then
|
||||||
|
c=cdat2(1:NSPM)+cdat2(NSPM+1:2*NSPM)+cdat2(2*NSPM+1:NPTS)
|
||||||
|
endif
|
||||||
|
|
||||||
|
call msk144decodeframe(c,msgreceived,nsuccess)
|
||||||
|
if( nsuccess .eq. 1 ) then
|
||||||
|
fret=1500+ferrs(ip)
|
||||||
|
snrret=snrs(ip)
|
||||||
|
tret=times(ip)
|
||||||
|
return
|
||||||
|
endif
|
||||||
|
|
||||||
|
enddo ! frame averaging loop
|
||||||
|
enddo ! frequency dithering loop
|
||||||
|
enddo ! sample-time dither loop
|
||||||
|
enddo ! peak loop
|
||||||
|
enddo ! candidate loop
|
||||||
|
return
|
||||||
|
end subroutine msk144spd
|
||||||
102
lib/msk144sync.f90
Normal file
102
lib/msk144sync.f90
Normal file
@ -0,0 +1,102 @@
|
|||||||
|
subroutine msk144sync(cdat,n,ntol,ndf,iavmask,npeaks,fest,snr,ipklocs,pkamps,c)
|
||||||
|
|
||||||
|
parameter (NSPM=864)
|
||||||
|
complex cdat(n)
|
||||||
|
complex cdat2(n)
|
||||||
|
complex c(NSPM) !Coherently averaged complex data
|
||||||
|
complex ct2(2*NSPM)
|
||||||
|
complex cs(NSPM)
|
||||||
|
complex cb(42) !Complex waveform for sync word
|
||||||
|
complex cc(0:NSPM-1)
|
||||||
|
|
||||||
|
integer s8(8)
|
||||||
|
integer iloc(1)
|
||||||
|
integer ipklocs(npeaks)
|
||||||
|
integer iavmask(8) ! defines which frames to average
|
||||||
|
|
||||||
|
real cbi(42),cbq(42)
|
||||||
|
real pkamps(npeaks)
|
||||||
|
real xcc(0:NSPM-1)
|
||||||
|
real xccs(0:NSPM-1)
|
||||||
|
real pp(12) !Half-sine pulse shape
|
||||||
|
logical first
|
||||||
|
data first/.true./
|
||||||
|
data s8/0,1,1,1,0,0,1,0/
|
||||||
|
save first,cb,fs,pi,twopi,dt,s8,pp
|
||||||
|
|
||||||
|
! call system_clock(count0,clkfreq)
|
||||||
|
if(first) then
|
||||||
|
pi=4.0*atan(1.0)
|
||||||
|
twopi=8.0*atan(1.0)
|
||||||
|
fs=12000.0
|
||||||
|
dt=1.0/fs
|
||||||
|
|
||||||
|
do i=1,12 !Define half-sine pulse
|
||||||
|
angle=(i-1)*pi/12.0
|
||||||
|
pp(i)=sin(angle)
|
||||||
|
enddo
|
||||||
|
|
||||||
|
! Define the sync word waveforms
|
||||||
|
s8=2*s8-1
|
||||||
|
cbq(1:6)=pp(7:12)*s8(1)
|
||||||
|
cbq(7:18)=pp*s8(3)
|
||||||
|
cbq(19:30)=pp*s8(5)
|
||||||
|
cbq(31:42)=pp*s8(7)
|
||||||
|
cbi(1:12)=pp*s8(2)
|
||||||
|
cbi(13:24)=pp*s8(4)
|
||||||
|
cbi(25:36)=pp*s8(6)
|
||||||
|
cbi(37:42)=pp(1:6)*s8(8)
|
||||||
|
cb=cmplx(cbi,cbq)
|
||||||
|
|
||||||
|
first=.false.
|
||||||
|
endif
|
||||||
|
|
||||||
|
navg=sum(iavmask)
|
||||||
|
xmax=0.0
|
||||||
|
bestf=0.0
|
||||||
|
do ifr=-ntol,ntol,ndf !Find freq that maximizes sync
|
||||||
|
ferr=ifr
|
||||||
|
call tweak1(cdat,n,-(1500+ferr),cdat2)
|
||||||
|
c=0
|
||||||
|
do i=1,8
|
||||||
|
ib=(i-1)*NSPM+1
|
||||||
|
ie=ib+NSPM-1
|
||||||
|
if( iavmask(i) .eq. 1 ) then
|
||||||
|
c(1:NSPM)=c(1:NSPM)+cdat2(ib:ie)
|
||||||
|
endif
|
||||||
|
enddo
|
||||||
|
|
||||||
|
cc=0
|
||||||
|
ct2(1:NSPM)=c
|
||||||
|
ct2(NSPM+1:2*NSPM)=c
|
||||||
|
do ish=0,NSPM-1
|
||||||
|
cc(ish)=dot_product(ct2(1+ish:42+ish)+ct2(336+ish:377+ish),cb(1:42))
|
||||||
|
enddo
|
||||||
|
|
||||||
|
xcc=abs(cc)
|
||||||
|
xb=maxval(xcc)/(48.0*sqrt(float(navg)))
|
||||||
|
if(xb.gt.xmax) then
|
||||||
|
xmax=xb
|
||||||
|
bestf=ferr
|
||||||
|
cs=c
|
||||||
|
xccs=xcc
|
||||||
|
endif
|
||||||
|
enddo
|
||||||
|
|
||||||
|
fest=1500+bestf
|
||||||
|
c=cs
|
||||||
|
xcc=xccs
|
||||||
|
|
||||||
|
! Find npeaks largest peaks
|
||||||
|
do ipk=1,npeaks
|
||||||
|
iloc=maxloc(xcc)
|
||||||
|
ic2=iloc(1)
|
||||||
|
ipklocs(ipk)=ic2
|
||||||
|
pkamps(ipk)=xcc(ic2-1)
|
||||||
|
xcc(max(0,ic2-7):min(NSPM-1,ic2+7))=0.0
|
||||||
|
enddo
|
||||||
|
|
||||||
|
!write(*,*) xmax,bestf,fest,pkamps(1)/(48.0*sqrt(float(navg))),ipklocs(1),ipklocs(2)
|
||||||
|
snr=-6.0
|
||||||
|
return
|
||||||
|
end subroutine msk144sync
|
||||||
107
lib/mskrtd.f90
107
lib/mskrtd.f90
@ -10,34 +10,41 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
|
|||||||
parameter (NAVGMAX=7) !Coherently average up to 7 frames
|
parameter (NAVGMAX=7) !Coherently average up to 7 frames
|
||||||
parameter (NPTSMAX=7*NSPM) !Max points analyzed at once
|
parameter (NPTSMAX=7*NSPM) !Max points analyzed at once
|
||||||
|
|
||||||
integer*2 id2(NZ) !Raw 16-bit data
|
character*3 decsym !"&" for mskspd or "^" for long averages
|
||||||
character*22 msgreceived !Decoded message
|
character*22 msgreceived !Decoded message
|
||||||
character*80 line !Formatted line with UTC dB T Freq Msg
|
character*80 line !Formatted line with UTC dB T Freq Msg
|
||||||
|
|
||||||
complex cdat(NFFT1) !Analytic signal
|
complex cdat(NFFT1) !Analytic signal
|
||||||
complex cdat2(NFFT1) !Signal shifted to baseband
|
|
||||||
complex c(NSPM) !Coherently averaged complex data
|
complex c(NSPM) !Coherently averaged complex data
|
||||||
complex ct(NSPM)
|
complex ct(NSPM)
|
||||||
complex ct2(2*NSPM)
|
|
||||||
complex cs(NSPM)
|
|
||||||
complex cb(42) !Complex waveform for sync word
|
complex cb(42) !Complex waveform for sync word
|
||||||
complex cc(0:NSPM-1)
|
|
||||||
|
|
||||||
! integer*8 count0,count1,count2,count3,clkfreq
|
! integer*8 count0,count1,count2,count3,clkfreq
|
||||||
|
integer*2 id2(NZ) !Raw 16-bit data
|
||||||
|
integer iavmask(8)
|
||||||
|
integer iavpatterns(8,6)
|
||||||
integer s8(8)
|
integer s8(8)
|
||||||
integer iloc(1)
|
|
||||||
integer ipeaks(10)
|
integer ipeaks(10)
|
||||||
integer nav(6)
|
integer nav(6)
|
||||||
|
|
||||||
real cbi(42),cbq(42)
|
real cbi(42),cbq(42)
|
||||||
real d(NFFT1)
|
real d(NFFT1)
|
||||||
real xcc(0:NSPM-1)
|
real pkamps(10)
|
||||||
real xccs(0:NSPM-1)
|
|
||||||
real pp(12) !Half-sine pulse shape
|
real pp(12) !Half-sine pulse shape
|
||||||
|
real xmc(6)
|
||||||
logical first
|
logical first
|
||||||
data first/.true./
|
data first/.true./
|
||||||
data s8/0,1,1,1,0,0,1,0/
|
data s8/0,1,1,1,0,0,1,0/
|
||||||
data nav/1,2,3,5,7,9/
|
data nav/1,2,3,5,7,9/
|
||||||
|
data iavpatterns/ &
|
||||||
|
1,1,1,0,0,0,0,0, &
|
||||||
|
0,1,1,1,0,0,0,0, &
|
||||||
|
0,0,1,1,1,0,0,0, &
|
||||||
|
1,1,1,1,1,0,0,0, &
|
||||||
|
0,0,1,1,1,1,1,0, &
|
||||||
|
1,1,1,1,1,1,1,0/
|
||||||
|
data xmc/1.5,2.5,3.5,2.5,4.5,3.5/ !Used to label decode with time at center of averaging mask
|
||||||
|
|
||||||
save first,cb,fs,pi,twopi,dt,s8,pp,t03,t12,nutc00
|
save first,cb,fs,pi,twopi,dt,s8,pp,t03,t12,nutc00
|
||||||
|
|
||||||
! call system_clock(count0,clkfreq)
|
! call system_clock(count0,clkfreq)
|
||||||
@ -80,58 +87,28 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
|
|||||||
d(1:NZ)=fac*d(1:NZ)
|
d(1:NZ)=fac*d(1:NZ)
|
||||||
d(NZ+1:NFFT1)=0.
|
d(NZ+1:NFFT1)=0.
|
||||||
call analytic(d,NZ,NFFT1,cdat) !Convert to analytic signal and filter
|
call analytic(d,NZ,NFFT1,cdat) !Convert to analytic signal and filter
|
||||||
|
|
||||||
|
np=7*NSPM
|
||||||
|
call msk144spd(cdat,np,ntol,nsuccess,msgreceived,fest,snr,tdec)
|
||||||
|
if( nsuccess .eq. 1 ) then
|
||||||
|
tdec=tsec+tdec
|
||||||
|
decsym=' & '
|
||||||
|
goto 999
|
||||||
|
endif
|
||||||
|
|
||||||
|
tframe=float(NSPM)/12000.0
|
||||||
nmessages=0
|
nmessages=0
|
||||||
line=char(0)
|
line=char(0)
|
||||||
nshort=0
|
|
||||||
npts=7168
|
npts=7168
|
||||||
nsnr=-4 !### Temporary ###
|
|
||||||
|
|
||||||
do iavg=1,5
|
do iavg=1,6
|
||||||
navg=nav(iavg)
|
iavmask=iavpatterns(1:8,iavg)
|
||||||
ndf=nint(7.0/navg) + 1
|
navg=sum(iavmask)
|
||||||
xmax=0.0
|
! ndf=nint(7.0/navg) + 1
|
||||||
bestf=0.0
|
ndf=nint(7.0/navg)
|
||||||
! call system_clock(count1,clkfreq)
|
|
||||||
do ifr=-ntol,ntol,ndf !Find freq that maximizes sync
|
|
||||||
ferr=ifr
|
|
||||||
call tweak1(cdat,NPTS,-(1500+ferr),cdat2)
|
|
||||||
c=0
|
|
||||||
do i=1,navg
|
|
||||||
ib=(i-1)*NSPM+1
|
|
||||||
ie=ib+NSPM-1
|
|
||||||
c(1:NSPM)=c(1:NSPM)+cdat2(ib:ie)
|
|
||||||
enddo
|
|
||||||
|
|
||||||
cc=0
|
npeaks=2
|
||||||
ct2(1:NSPM)=c
|
call msk144sync(cdat(1:8*NSPM),8*864,ntol,ndf,iavmask,npeaks,fest,snr,ipeaks,pkamps,c)
|
||||||
ct2(NSPM+1:2*NSPM)=c
|
|
||||||
do ish=0,NSPM-1
|
|
||||||
cc(ish)=dot_product(ct2(1+ish:42+ish)+ct2(336+ish:377+ish),cb(1:42))
|
|
||||||
enddo
|
|
||||||
|
|
||||||
xcc=abs(cc)
|
|
||||||
xb=maxval(xcc)/(48.0*sqrt(float(navg)))
|
|
||||||
if(xb.gt.xmax) then
|
|
||||||
xmax=xb
|
|
||||||
bestf=ferr
|
|
||||||
cs=c
|
|
||||||
xccs=xcc
|
|
||||||
endif
|
|
||||||
enddo
|
|
||||||
! call system_clock(count2,clkfreq)
|
|
||||||
|
|
||||||
fest=1500+bestf
|
|
||||||
c=cs
|
|
||||||
xcc=xccs
|
|
||||||
|
|
||||||
! Find 2 largest peaks
|
|
||||||
do ipk=1,2
|
|
||||||
iloc=maxloc(xcc)
|
|
||||||
ic2=iloc(1)
|
|
||||||
ipeaks(ipk)=ic2
|
|
||||||
xcc(max(0,ic2-7):min(NSPM-1,ic2+7))=0.0
|
|
||||||
enddo
|
|
||||||
|
|
||||||
do ipk=1,2
|
do ipk=1,2
|
||||||
do is=1,3
|
do is=1,3
|
||||||
@ -143,8 +120,8 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
|
|||||||
call msk144decodeframe(ct,msgreceived,nsuccess)
|
call msk144decodeframe(ct,msgreceived,nsuccess)
|
||||||
|
|
||||||
if(nsuccess .gt. 0) then
|
if(nsuccess .gt. 0) then
|
||||||
write(line,1020) nutc0,nsnr,tsec,nint(fest),msgreceived,char(0)
|
tdec=tsec+xmc(iavg)*tframe
|
||||||
1020 format(i6.6,i4,f5.1,i5,' ^ ',a22,a1)
|
decsym=' ^ '
|
||||||
goto 999
|
goto 999
|
||||||
endif
|
endif
|
||||||
enddo !Slicer dither
|
enddo !Slicer dither
|
||||||
@ -152,18 +129,10 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
|
|||||||
enddo
|
enddo
|
||||||
|
|
||||||
msgreceived=' '
|
msgreceived=' '
|
||||||
ndither=-98
|
return
|
||||||
999 continue
|
999 continue
|
||||||
|
nsnr=nint(snr)
|
||||||
! call system_clock(count3,clkfreq)
|
write(line,1020) nutc0,nsnr,tdec,nint(fest),decsym,msgreceived,char(0)
|
||||||
! t12=t12 + float(count2-count1)/clkfreq
|
1020 format(i6.6,i4,f5.1,i5,a3,a22,a1)
|
||||||
! t03=t03 + float(count3-count0)/clkfreq
|
|
||||||
! if(navg.gt.7) navg=0
|
|
||||||
! write(*,3002) nutc0,tsec,t12,t03,xmax,nint(bestf),navg, &
|
|
||||||
! nbadsync,niterations,ipk,is,msgreceived(1:19)
|
|
||||||
! write(62,3002) nutc0,tsec,t12,t03,xmax,nint(bestf),navg, &
|
|
||||||
! nbadsync,niterations,ipk,is,msgreceived(1:19)
|
|
||||||
!3002 format(i6,f6.2,2f7.2,f6.2,i5,5i3,1x,a19)
|
|
||||||
|
|
||||||
return
|
return
|
||||||
end subroutine mskrtd
|
end subroutine mskrtd
|
||||||
|
|||||||
Loading…
x
Reference in New Issue
Block a user