mirror of https://github.com/saitohirga/WSJT-X.git
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)
|
|||
!###
|
||||
if(bmsk144) then
|
||||
if(k.ge.7168) then
|
||||
tsec=(k-3584)/12000.0
|
||||
tsec=(k-7168)/12000.0
|
||||
call mskrtd(id2(k-7168+1:k),nutc0,tsec,ntol,line1)
|
||||
endif
|
||||
endif
|
||||
|
|
|
|||
|
|
@ -84,9 +84,9 @@ program msk144d2
|
|||
call timer('read ',1)
|
||||
do i=1,npts,7*512
|
||||
ichunk=id2(i:i+7*1024-1)
|
||||
tsec=(i-1+7*512)/12000.0
|
||||
tsec=(i-1)/12000.0
|
||||
call mskrtd(ichunk,nutc,tsec,ntol,line)
|
||||
if( line .ne. ' ' ) then
|
||||
if( index(line,"^") .ne. 0 .or. index(line,"&") .ne. 0 ) then
|
||||
write(*,*) line
|
||||
endif
|
||||
enddo
|
||||
|
|
|
|||
|
|
@ -1,5 +1,5 @@
|
|||
subroutine msk144decodeframe(c,msgreceived,nsuccess)
|
||||
use timer_module, only: timer
|
||||
! use timer_module, only: timer
|
||||
|
||||
parameter (NSPM=864)
|
||||
character*22 msgreceived
|
||||
|
|
@ -16,10 +16,9 @@ subroutine msk144decodeframe(c,msgreceived,nsuccess)
|
|||
logical first
|
||||
data first/.true./
|
||||
data s8/0,1,1,1,0,0,1,0/
|
||||
save df,first,cb,fs,pi,twopi,dt,s8,pp,nmatchedfilter
|
||||
save df,first,cb,fs,pi,twopi,dt,s8,pp
|
||||
|
||||
if(first) then
|
||||
nmatchedfilter=1
|
||||
! define half-sine pulse and raised-cosine edge window
|
||||
pi=4d0*datan(1d0)
|
||||
twopi=8d0*datan(1d0)
|
||||
|
|
@ -95,9 +94,9 @@ subroutine msk144decodeframe(c,msgreceived,nsuccess)
|
|||
|
||||
max_iterations=10
|
||||
max_dither=1
|
||||
call timer('bpdec144 ',0)
|
||||
! call timer('bpdec144 ',0)
|
||||
call bpdecode144(llr,max_iterations,decoded,niterations)
|
||||
call timer('bpdec144 ',1)
|
||||
! call timer('bpdec144 ',1)
|
||||
|
||||
if( niterations .ge. 0.0 ) then
|
||||
call extractmessage144(decoded,msgreceived,nhashflag)
|
||||
|
|
|
|||
|
|
@ -0,0 +1,312 @@
|
|||
subroutine msk144spd(cbig,n,ntol,nsuccess,msgreceived,fret,snrret,tret)
|
||||
! msk144 short-ping-decoder
|
||||
|
||||
use timer_module, only: timer
|
||||
|
||||
parameter (NSPM=864, NPTS=3*NSPM, MAXSTEPS=1700, NFFT=NSPM, MAXCAND=5)
|
||||
character*22 msgreceived
|
||||
complex cbig(n)
|
||||
complex cdat(NPTS) !Analytic signal
|
||||
complex cdat2(NPTS)
|
||||
complex c(NSPM)
|
||||
complex ctmp(NFFT)
|
||||
complex cb(42) !Complex waveform for sync word
|
||||
complex cbr(42) !Complex waveform for reversed sync word
|
||||
complex cfac,cca,ccb
|
||||
complex cc(NPTS)
|
||||
complex ccr(NPTS)
|
||||
complex cc1(NPTS)
|
||||
complex cc2(NPTS)
|
||||
complex ccr1(NPTS)
|
||||
complex ccr2(NPTS)
|
||||
complex bb(6)
|
||||
integer s8(8),s8r(8)
|
||||
integer, dimension(1) :: iloc
|
||||
integer indices(MAXSTEPS)
|
||||
integer ipeaks(10)
|
||||
logical ismask(NFFT)
|
||||
real cbi(42),cbq(42)
|
||||
real detmet(-2:MAXSTEPS+3)
|
||||
real detmet2(-2:MAXSTEPS+3)
|
||||
real detfer(MAXSTEPS)
|
||||
real rcw(12)
|
||||
real dd(NPTS)
|
||||
real ferrs(MAXCAND)
|
||||
real pp(12) !Half-sine pulse shape
|
||||
real snrs(MAXCAND)
|
||||
real times(MAXCAND)
|
||||
real tonespec(NFFT)
|
||||
real*8 dt, df, fs, pi, twopi
|
||||
logical first
|
||||
data first/.true./
|
||||
data s8/0,1,1,1,0,0,1,0/
|
||||
data s8r/1,0,1,1,0,0,0,1/
|
||||
save df,first,cb,fs,pi,twopi,dt,s8,rcw,pp,nmatchedfilter
|
||||
|
||||
if(first) then
|
||||
nmatchedfilter=1
|
||||
! define half-sine pulse and raised-cosine edge window
|
||||
pi=4d0*datan(1d0)
|
||||
twopi=8d0*datan(1d0)
|
||||
fs=12000.0
|
||||
dt=1.0/fs
|
||||
df=fs/NFFT
|
||||
|
||||
do i=1,12
|
||||
angle=(i-1)*pi/12.0
|
||||
pp(i)=sin(angle)
|
||||
rcw(i)=(1-cos(angle))/2
|
||||
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)
|
||||
s8r=2*s8r-1
|
||||
cbq(1:6)=pp(7:12)*s8r(1)
|
||||
cbq(7:18)=pp*s8r(3)
|
||||
cbq(19:30)=pp*s8r(5)
|
||||
cbq(31:42)=pp*s8r(7)
|
||||
cbi(1:12)=pp*s8r(2)
|
||||
cbi(13:24)=pp*s8r(4)
|
||||
cbi(25:36)=pp*s8r(6)
|
||||
cbi(37:42)=pp(1:6)*s8r(8)
|
||||
cbr=cmplx(cbi,cbq)
|
||||
|
||||
first=.false.
|
||||
endif
|
||||
|
||||
! fill the detmet, detferr arrays
|
||||
nstep=(n-NPTS)/216 ! 72ms/4=18ms steps
|
||||
detmet=0
|
||||
detmet2=0
|
||||
detfer=-999.99
|
||||
do istp=1,nstep
|
||||
ns=1+216*(istp-1)
|
||||
ne=ns+NSPM-1
|
||||
if( ne .gt. n ) exit
|
||||
ctmp=cmplx(0.0,0.0)
|
||||
ctmp(1:NSPM)=cbig(ns:ne)
|
||||
|
||||
! Coarse carrier frequency sync - seek tones at 2000 Hz and 4000 Hz in
|
||||
! squared signal spectrum.
|
||||
! search range for coarse frequency error is +/- 100 Hz
|
||||
|
||||
ctmp=ctmp**2
|
||||
ctmp(1:12)=ctmp(1:12)*rcw
|
||||
ctmp(NSPM-11:NSPM)=ctmp(NSPM-11:NSPM)*rcw(12:1:-1)
|
||||
call four2a(ctmp,NFFT,1,-1,1)
|
||||
tonespec=abs(ctmp)**2
|
||||
|
||||
ihlo=(4000-2*ntol)/df+1
|
||||
ihhi=(4000+2*ntol)/df+1
|
||||
ismask=.false.
|
||||
ismask(ihlo:ihhi)=.true. ! high tone search window
|
||||
iloc=maxloc(tonespec,ismask)
|
||||
ihpk=iloc(1)
|
||||
deltah=-real( (ctmp(ihpk-1)-ctmp(ihpk+1)) / (2*ctmp(ihpk)-ctmp(ihpk-1)-ctmp(ihpk+1)) )
|
||||
ah=tonespec(ihpk)
|
||||
ahavp=(sum(tonespec,ismask)-ah)/count(ismask)
|
||||
trath=ah/(ahavp+0.01)
|
||||
illo=(2000-2*ntol)/df+1
|
||||
ilhi=(2000+2*ntol)/df+1
|
||||
ismask=.false.
|
||||
ismask(illo:ilhi)=.true. ! window for low tone
|
||||
iloc=maxloc(tonespec,ismask)
|
||||
ilpk=iloc(1)
|
||||
deltal=-real( (ctmp(ilpk-1)-ctmp(ilpk+1)) / (2*ctmp(ilpk)-ctmp(ilpk-1)-ctmp(ilpk+1)) )
|
||||
al=tonespec(ilpk)
|
||||
alavp=(sum(tonespec,ismask)-al)/count(ismask)
|
||||
tratl=al/(alavp+0.01)
|
||||
fdiff=(ihpk+deltah-ilpk-deltal)*df
|
||||
i2000=2000/df+1
|
||||
i4000=4000/df+1
|
||||
ferrh=(ihpk+deltah-i4000)*df/2.0
|
||||
ferrl=(ilpk+deltal-i2000)*df/2.0
|
||||
if( ah .ge. al ) then
|
||||
ferr=ferrh
|
||||
else
|
||||
ferr=ferrl
|
||||
endif
|
||||
detmet(istp)=max(ah,al)
|
||||
detmet2(istp)=max(trath,tratl)
|
||||
detfer(istp)=ferr
|
||||
enddo ! end of detection-metric and frequency error estimation loop
|
||||
|
||||
call indexx(detmet(1:nstep),nstep,indices) !find median of detection metric vector
|
||||
xmed=detmet(indices(nstep/4))
|
||||
detmet=detmet/xmed ! noise floor of detection metric is 1.0
|
||||
ndet=0
|
||||
|
||||
do ip=1,MAXCAND ! Find candidates
|
||||
iloc=maxloc(detmet(1:nstep))
|
||||
il=iloc(1)
|
||||
! if( (detmet(il) .lt. 4.0) ) exit
|
||||
if( (detmet(il) .lt. 3.0) ) exit
|
||||
if( abs(detfer(il)) .le. ntol ) then
|
||||
ndet=ndet+1
|
||||
times(ndet)=((il-1)*216+NSPM/2)*dt
|
||||
ferrs(ndet)=detfer(il)
|
||||
snrs(ndet)=12.0*log10(detmet(il))/2-9.0
|
||||
endif
|
||||
! detmet(max(1,il-1):min(nstep,il+1))=0.0
|
||||
detmet(il)=0.0
|
||||
enddo
|
||||
|
||||
if( ndet .lt. 3 ) then
|
||||
do ip=1,MAXCAND-ndet ! Find candidates
|
||||
iloc=maxloc(detmet2(1:nstep))
|
||||
il=iloc(1)
|
||||
if( (detmet2(il) .lt. 12.0) ) exit
|
||||
if( abs(detfer(il)) .le. ntol ) then
|
||||
ndet=ndet+1
|
||||
times(ndet)=((il-1)*216+NSPM/2)*dt
|
||||
ferrs(ndet)=detfer(il)
|
||||
snrs(ndet)=12.0*log10(detmet2(il))/2-9.0
|
||||
endif
|
||||
! detmet2(max(1,il-1):min(nstep,il+1))=0.0
|
||||
detmet2(il)=0.0
|
||||
enddo
|
||||
endif
|
||||
|
||||
nsuccess=0
|
||||
msgreceived=' '
|
||||
do ip=1,ndet ! Try to sync/demod/decode each candidate.
|
||||
imid=times(ip)*fs
|
||||
if( imid .lt. NPTS/2 ) imid=NPTS/2
|
||||
if( imid .gt. n-NPTS/2 ) imid=n-NPTS/2
|
||||
cdat=cbig(imid-NPTS/2+1:imid+NPTS/2)
|
||||
ferr=ferrs(ip)
|
||||
|
||||
! remove coarse freq error - should now be within a few Hz
|
||||
call tweak1(cdat,NPTS,-(1500+ferr),cdat)
|
||||
|
||||
! attempt frame synchronization
|
||||
! correlate with sync word waveforms
|
||||
cc=0
|
||||
ccr=0
|
||||
cc1=0
|
||||
cc2=0
|
||||
ccr1=0
|
||||
ccr2=0
|
||||
do i=1,NPTS-(56*6+41)
|
||||
cc1(i)=sum(cdat(i:i+41)*conjg(cb))
|
||||
cc2(i)=sum(cdat(i+56*6:i+56*6+41)*conjg(cb))
|
||||
enddo
|
||||
cc=cc1+cc2
|
||||
dd=abs(cc1)*abs(cc2)
|
||||
cmax=maxval(abs(cc))
|
||||
|
||||
! Find 6 largest peaks
|
||||
do ipk=1, 6
|
||||
iloc=maxloc(abs(cc))
|
||||
ic1=iloc(1)
|
||||
iloc=maxloc(dd)
|
||||
ic2=iloc(1)
|
||||
ipeaks(ipk)=ic2
|
||||
dd(max(1,ic2-7):min(NPTS-56*6-41,ic2+7))=0.0
|
||||
enddo
|
||||
|
||||
do ipk=1,4
|
||||
|
||||
! we want ic to be the index of the first sample of the frame
|
||||
ic0=ipeaks(ipk)
|
||||
|
||||
! fine adjustment of sync index
|
||||
do i=1,6
|
||||
if( ic0+11+NSPM .le. NPTS ) then
|
||||
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 )
|
||||
else
|
||||
bb(i) = sum( ( cdat(ic0+i-1+6:NPTS:6) * conjg( cdat(ic0+i-1:NPTS-6:6) ) )**2 )
|
||||
endif
|
||||
enddo
|
||||
iloc=maxloc(abs(bb))
|
||||
ibb=iloc(1)
|
||||
bba=abs(bb(ibb))
|
||||
bbp=atan2(-imag(bb(ibb)),-real(bb(ibb)))/(2*twopi*6*dt)
|
||||
if( ibb .le. 3 ) ibb=ibb-1
|
||||
if( ibb .gt. 3 ) ibb=ibb-7
|
||||
|
||||
do id=1,3 ! Slicer dither.
|
||||
if( id .eq. 1 ) is=0
|
||||
if( id .eq. 2 ) is=-1
|
||||
if( id .eq. 3 ) is=1
|
||||
|
||||
! Adjust frame index to place peak of bb at desired lag
|
||||
ic=ic0+ibb+is
|
||||
if( ic .lt. 1 ) ic=ic+864
|
||||
|
||||
! Estimate fine frequency error.
|
||||
! Should a larger separation be used when frames are averaged?
|
||||
cca=sum(cdat(ic:ic+41)*conjg(cb))
|
||||
if( ic+56*6+41 .le. NPTS ) then
|
||||
ccb=sum(cdat(ic+56*6:ic+56*6+41)*conjg(cb))
|
||||
cfac=ccb*conjg(cca)
|
||||
ferr2=atan2(imag(cfac),real(cfac))/(twopi*56*6*dt)
|
||||
else
|
||||
ccb=sum(cdat(ic-88*6:ic-88*6+41)*conjg(cb))
|
||||
cfac=cca*conjg(ccb)
|
||||
ferr2=atan2(imag(cfac),real(cfac))/(twopi*88*6*dt)
|
||||
endif
|
||||
|
||||
! Final estimate of the carrier frequency - returned to the calling program
|
||||
fest=1500+ferr+ferr2
|
||||
|
||||
do idf=0,4 ! frequency jitter
|
||||
if( idf .eq. 0 ) then
|
||||
deltaf=0.0
|
||||
elseif( mod(idf,2) .eq. 0 ) then
|
||||
deltaf=idf
|
||||
else
|
||||
deltaf=-(idf+1)
|
||||
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
|
||||
|
|
@ -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 (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*80 line !Formatted line with UTC dB T Freq Msg
|
||||
|
||||
complex cdat(NFFT1) !Analytic signal
|
||||
complex cdat2(NFFT1) !Signal shifted to baseband
|
||||
complex c(NSPM) !Coherently averaged complex data
|
||||
complex ct(NSPM)
|
||||
complex ct2(2*NSPM)
|
||||
complex cs(NSPM)
|
||||
complex cb(42) !Complex waveform for sync word
|
||||
complex cc(0:NSPM-1)
|
||||
|
||||
! 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 iloc(1)
|
||||
integer ipeaks(10)
|
||||
integer nav(6)
|
||||
|
||||
real cbi(42),cbq(42)
|
||||
real d(NFFT1)
|
||||
real xcc(0:NSPM-1)
|
||||
real xccs(0:NSPM-1)
|
||||
real pkamps(10)
|
||||
real pp(12) !Half-sine pulse shape
|
||||
real xmc(6)
|
||||
logical first
|
||||
data first/.true./
|
||||
data s8/0,1,1,1,0,0,1,0/
|
||||
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
|
||||
|
||||
! call system_clock(count0,clkfreq)
|
||||
|
|
@ -80,58 +87,28 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
|
|||
d(1:NZ)=fac*d(1:NZ)
|
||||
d(NZ+1:NFFT1)=0.
|
||||
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
|
||||
line=char(0)
|
||||
nshort=0
|
||||
npts=7168
|
||||
nsnr=-4 !### Temporary ###
|
||||
|
||||
do iavg=1,5
|
||||
navg=nav(iavg)
|
||||
ndf=nint(7.0/navg) + 1
|
||||
xmax=0.0
|
||||
bestf=0.0
|
||||
! 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
|
||||
do iavg=1,6
|
||||
iavmask=iavpatterns(1:8,iavg)
|
||||
navg=sum(iavmask)
|
||||
! ndf=nint(7.0/navg) + 1
|
||||
ndf=nint(7.0/navg)
|
||||
|
||||
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
|
||||
! 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
|
||||
npeaks=2
|
||||
call msk144sync(cdat(1:8*NSPM),8*864,ntol,ndf,iavmask,npeaks,fest,snr,ipeaks,pkamps,c)
|
||||
|
||||
do ipk=1,2
|
||||
do is=1,3
|
||||
|
|
@ -143,8 +120,8 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
|
|||
call msk144decodeframe(ct,msgreceived,nsuccess)
|
||||
|
||||
if(nsuccess .gt. 0) then
|
||||
write(line,1020) nutc0,nsnr,tsec,nint(fest),msgreceived,char(0)
|
||||
1020 format(i6.6,i4,f5.1,i5,' ^ ',a22,a1)
|
||||
tdec=tsec+xmc(iavg)*tframe
|
||||
decsym=' ^ '
|
||||
goto 999
|
||||
endif
|
||||
enddo !Slicer dither
|
||||
|
|
@ -152,18 +129,10 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
|
|||
enddo
|
||||
|
||||
msgreceived=' '
|
||||
ndither=-98
|
||||
return
|
||||
999 continue
|
||||
|
||||
! call system_clock(count3,clkfreq)
|
||||
! t12=t12 + float(count2-count1)/clkfreq
|
||||
! 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)
|
||||
|
||||
nsnr=nint(snr)
|
||||
write(line,1020) nutc0,nsnr,tdec,nint(fest),decsym,msgreceived,char(0)
|
||||
1020 format(i6.6,i4,f5.1,i5,a3,a22,a1)
|
||||
return
|
||||
end subroutine mskrtd
|
||||
|
|
|
|||
Loading…
Reference in New Issue