WSJT-X/lib/mskrtd.f90

257 lines
7.5 KiB
Fortran
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subroutine mskrtd(id2,nutc0,tsec,ntol,nrxfreq,ndepth,mycall,mygrid,hiscall, &
bshmsg,btrain,pcoeffs,bswl,datadir,line)
! Real-time decoder for MSK144.
! Analysis block size = NZ = 7168 samples, t_block = 0.597333 s
! Called from hspec() at half-block increments, about 0.3 s
parameter (NZ=7168) !Block size
parameter (NSPM=864) !Number of samples per message frame
parameter (NFFT1=8192) !FFT size for making analytic signal
parameter (NPATTERNS=4) !Number of frame averaging patterns to try
parameter (NRECENT=10) !Number of recent calls to remember
parameter (NSHMEM=50) !Number of recent SWL messages to remember
character*4 decsym !"&" for mskspd or "^" for long averages
character*37 msgreceived !Decoded message
character*37 msglast,msglastswl !Used for dupechecking
character*80 line !Formatted line with UTC dB T Freq Msg
character*12 mycall,hiscall
character*6 mygrid
character*12 recent_calls(NRECENT)
character*22 recent_shmsgs(NSHMEM)
character*512 datadir
complex cdat(NFFT1) !Analytic signal
complex c(NSPM) !Coherently averaged complex data
complex ct(NSPM)
integer*2 id2(NZ) !Raw 16-bit data
integer iavmask(8)
integer iavpatterns(8,NPATTERNS)
integer npkloc(10)
integer nhasharray(NRECENT,NRECENT)
integer nsnrlast,nsnrlastswl
real d(NFFT1)
real pow(8)
real softbits(144)
real xmc(NPATTERNS)
real*8 pcoeffs(5)
logical*1 bshmsg,btrain,bswl
logical*1 first
logical*1 bshdecode
logical*1 seenb4
logical*1 bflag
logical*1 bvar
data first/.true./
data iavpatterns/ &
1,1,1,1,0,0,0,0, &
0,0,1,1,1,1,0,0, &
1,1,1,1,1,0,0,0, &
1,1,1,1,1,1,1,0/
data xmc/2.0,4.5,2.5,3.5/ !Used to set time at center of averaging mask
First attempt at a UI phase compensation tool for MSK144 This builds on the static phase compensation in the MSK144 decoder and the phase analysis and polynomial fitting capabilities also in teh MSK144 decoder, by allowing captured data to be selected for phase equalization from the WSJT-X UI. Reads captured phase compensation curve estimate files containing fitted polynomial coefficients and measured phase data from MSK144 receptions. Intent is to select a compensation curve that is from a known transmitter like an SDR which have good phase linearity. Phase plots and compensation polynomials may be viewed and compared with the current compensation polynomial. A suitable polynomial can be applied to be use in all further decoding of MSK144 signals. Plots of the currently selected polynomial and its modified higher order terms polynomial which is actually used in equalization (this plot may be dropped - it is just for kicks at the moment). When a captured phase analysis file is loaded plots of the measured phase and the proposed best fit polynomial are shown. Basic maintenance is also included allowing clearing and loading captured plots and an option to revert to a flat no equalization curve. More to come on this as amplitude equalization is also possible, this will probably be similar, maybe even plotted on the same graph with dual axes for phase and amplitude. Amplitude correction from a measured reference spectrum could be viewed and selected for equalization for all modes. TBC... This change also introduces the QCustomPlot 3rd party widget. Currently this is statically linked from a qcp library built by the WSJT-X CMake script. This will probably be migrated to a shared object (DLL) build as a CMake external project, once some CMake script re-factoring has been completed, which is more in line with the QCustomPlot author's intentions. This will allow efficient reuse in other tools shipped with WSJT-X. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7570 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
2017-02-20 21:13:13 -05:00
save first,tsec0,nutc00,pnoise,cdat,msglast,msglastswl, &
nsnrlast,nsnrlastswl,recent_calls,nhasharray,recent_shmsgs
if(first) then
tsec0=tsec
nutc00=nutc0
pnoise=-1.0
do i=1,nrecent
recent_calls(i)(1:12)=' '
enddo
do i=1,nshmem
recent_shmsgs(i)(1:22)=' '
enddo
msglast=' '
msglastswl=' '
nsnrlast=-99
nsnrlastswl=-99
first=.false.
endif
fc=nrxfreq
! Dupe checking setup
if(nutc00.ne.nutc0 .or. tsec.lt.tsec0) then ! reset dupe checker
msglast=' '
msglastswl=' '
nsnrlast=-99
nsnrlastswl=-99
nutc00=nutc0
endif
tframe=float(NSPM)/12000.0
line=char(0)
msgreceived=' '
max_iterations=10
niterations=0
d(1:NZ)=id2
rms=sqrt(sum(d(1:NZ)*d(1:NZ))/NZ)
if(rms.lt.1.0) go to 999
fac=1.0/rms
d(1:NZ)=fac*d(1:NZ)
d(NZ+1:NFFT1)=0.
First attempt at a UI phase compensation tool for MSK144 This builds on the static phase compensation in the MSK144 decoder and the phase analysis and polynomial fitting capabilities also in teh MSK144 decoder, by allowing captured data to be selected for phase equalization from the WSJT-X UI. Reads captured phase compensation curve estimate files containing fitted polynomial coefficients and measured phase data from MSK144 receptions. Intent is to select a compensation curve that is from a known transmitter like an SDR which have good phase linearity. Phase plots and compensation polynomials may be viewed and compared with the current compensation polynomial. A suitable polynomial can be applied to be use in all further decoding of MSK144 signals. Plots of the currently selected polynomial and its modified higher order terms polynomial which is actually used in equalization (this plot may be dropped - it is just for kicks at the moment). When a captured phase analysis file is loaded plots of the measured phase and the proposed best fit polynomial are shown. Basic maintenance is also included allowing clearing and loading captured plots and an option to revert to a flat no equalization curve. More to come on this as amplitude equalization is also possible, this will probably be similar, maybe even plotted on the same graph with dual axes for phase and amplitude. Amplitude correction from a measured reference spectrum could be viewed and selected for equalization for all modes. TBC... This change also introduces the QCustomPlot 3rd party widget. Currently this is statically linked from a qcp library built by the WSJT-X CMake script. This will probably be migrated to a shared object (DLL) build as a CMake external project, once some CMake script re-factoring has been completed, which is more in line with the QCustomPlot author's intentions. This will allow efficient reuse in other tools shipped with WSJT-X. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7570 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
2017-02-20 21:13:13 -05:00
bvar=.true.
if( btrain ) bvar=.false. ! if training, turn off rx eq
call analytic(d,NZ,NFFT1,cdat,pcoeffs,bvar)
! Calculate average power for each frame and for the entire block.
! If decode is successful, largest power will be taken as signal+noise.
! If no decode, entire-block average will be used to update noise estimate.
pmax=-99
do i=1,8
ib=(i-1)*NSPM+1
ie=ib+NSPM-1
pow(i)=real(dot_product(cdat(ib:ie),cdat(ib:ie)))*rms**2
pmax=max(pmax,pow(i))
enddo
pavg=sum(pow)/8.0
! Short ping decoder uses squared-signal spectrum to determine where to
! center a 3-frame analysis window and attempts to decode each of the
! 3 frames along with 2- and 3-frame averages.
np=8*NSPM
call msk144spd(cdat,np,ntol,ndecodesuccess,msgreceived,fc,fest,tdec,navg,ct, &
softbits,recent_calls,nrecent)
if(ndecodesuccess.eq.0 .and. (bshmsg.or.bswl)) then
call msk40spd(cdat,np,ntol,mycall(1:6),hiscall(1:6),bswl,nhasharray, &
recent_calls,nrecent,ndecodesuccess,msgreceived,fc,fest,tdec,navg)
endif
if( ndecodesuccess .ge. 1 ) then
tdec=tsec+tdec
ipk=0
is=0
goto 900
endif
! If short ping decoder doesn't find a decode,
! Fast - short ping decoder only.
! Normal - try 4-frame averages
! Deep - try 4-, 5- and 7-frame averages.
npat=NPATTERNS
if( ndepth .eq. 1 ) npat=0
if( ndepth .eq. 2 ) npat=2
do iavg=1,npat
iavmask=iavpatterns(1:8,iavg)
navg=sum(iavmask)
deltaf=10.0/real(navg) ! search increment for frequency sync
npeaks=2
call msk144sync(cdat(1:8*NSPM),8,ntol,deltaf,iavmask,npeaks,fc, &
fest,npkloc,nsyncsuccess,xmax,c)
if( nsyncsuccess .eq. 0 ) cycle
do ipk=1,npeaks
do is=1,3
ic0=npkloc(ipk)
if(is.eq.2) ic0=max(1,ic0-1)
if(is.eq.3) ic0=min(NSPM,ic0+1)
ct=cshift(c,ic0-1)
call msk144decodeframe(ct,softbits,msgreceived,ndecodesuccess, &
recent_calls,nrecent)
if(ndecodesuccess .gt. 0) then
tdec=tsec+xmc(iavg)*tframe
goto 900
endif
enddo !Slicer dither
enddo !Peak loop
enddo
msgreceived=' '
! no decode - update noise level used for calculating displayed snr.
if( pnoise .lt. 0 ) then ! initialize noise level
pnoise=pavg
elseif( pavg .gt. pnoise ) then ! noise level is slow to rise
pnoise=0.9*pnoise+0.1*pavg
elseif( pavg .lt. pnoise ) then ! and quick to fall
pnoise=pavg
endif
go to 999
900 continue
! Successful decode - estimate snr
if( pnoise .gt. 0.0 ) then
snr0=10.0*log10(pmax/pnoise-1.0)
else
snr0=0.0
endif
nsnr=nint(snr0)
bshdecode=.false.
if( msgreceived(1:1) .eq. '<' ) bshdecode=.true.
if(.not. bshdecode) then
call msk144signalquality(ct,snr0,fest,tdec,softbits,msgreceived,hiscall, &
btrain,datadir,ncorrected,eyeopening,pcoeffs)
endif
decsym=' & '
if( btrain ) decsym=' ^ '
if( msgreceived(1:1).eq.'<') then
ncorrected=0
eyeopening=0.0
endif
if( nsnr .lt. -8 ) nsnr=-8
if( nsnr .gt. 24 ) nsnr=24
! Dupe check.
bflag=ndecodesuccess.eq.1 .and. &
(msgreceived.ne.msglast .or. nsnr.gt.nsnrlast .or. tsec.lt.tsec0)
if(bflag) then
msglast=msgreceived
nsnrlast=nsnr
if(.not. bshdecode) then
call update_hasharray(recent_calls,nrecent,nhasharray)
endif
write(line,1020) nutc0,nsnr,tdec,nint(fest),decsym,msgreceived, &
navg,ncorrected,eyeopening,char(0)
1020 format(i6.6,i4,f5.1,i5,a4,a22,i2,i3,f5.1,a1)
elseif(bswl .and. ndecodesuccess.ge.2) then
seenb4=.false.
do i=1,nshmem
if( msgreceived .eq. recent_shmsgs(i) ) then
seenb4=.true.
endif
enddo
call update_recent_shmsgs(msgreceived,recent_shmsgs,nshmem)
bflag=seenb4 .and. &
(msgreceived.ne.msglastswl .or. nsnr.gt.nsnrlastswl .or. tsec.lt.tsec0) &
.and. nsnr.gt.-6
if(bflag) then
msglastswl=msgreceived
nsnrlastswl=nsnr
write(line,1020) nutc0,nsnr,tdec,nint(fest),decsym,msgreceived, &
navg,ncorrected,eyeopening,char(0)
endif
endif
999 tsec0=tsec
return
end subroutine mskrtd
subroutine update_recent_shmsgs(message,msgs,nsize)
character*22 msgs(nsize)
character*22 message
logical*1 seen
seen=.false.
do i=1,nsize
if( msgs(i) .eq. message ) seen=.true.
enddo
if( .not. seen ) then
do i=nsize,2,-1
msgs(i)=msgs(i-1)
enddo
msgs(1)=message
endif
return
end subroutine update_recent_shmsgs