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8794bad146
By using the local 8-bit character set we can allow local non-ASCII characters in file paths, for example user account names on MS Windows with characters in the default code page.
258 lines
7.4 KiB
Fortran
258 lines
7.4 KiB
Fortran
subroutine mskrtd(id2,nutc0,tsec,ntol,nrxfreq,ndepth,mycall,hiscall, &
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bshmsg,btrain,pcoeffs,bswl,datadir,line)
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! Real-time decoder for MSK144.
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! Analysis block size = NZ = 7168 samples, t_block = 0.597333 s
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! Called from hspec() at half-block increments, about 0.3 s
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use packjt77
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parameter (NZ=7168) !Block size
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parameter (NSPM=864) !Number of samples per message frame
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parameter (NFFT1=8192) !FFT size for making analytic signal
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parameter (NPATTERNS=4) !Number of frame averaging patterns to try
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parameter (NSHMEM=50) !Number of recent SWL messages to remember
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character*4 decsym !"&" for mskspd or "^" for long averages
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character*37 msgreceived !Decoded message
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character*37 msglast,msglastswl !Used for dupechecking
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character*80 line !Formatted line with UTC dB T Freq Msg
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character*12 mycall,hiscall
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character*37 recent_shmsgs(NSHMEM)
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character*(*) datadir
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complex cdat(NFFT1) !Analytic signal
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complex c(NSPM) !Coherently averaged complex data
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complex ct(NSPM)
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integer*2 id2(NZ) !Raw 16-bit data
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integer iavmask(8)
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integer iavpatterns(8,NPATTERNS)
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integer npkloc(10)
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integer nhasharray(MAXRECENT,MAXRECENT)
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integer nsnrlast,nsnrlastswl
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real d(NFFT1)
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real pow(8)
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real softbits(144)
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real xmc(NPATTERNS)
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real*8 pcoeffs(5)
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logical*1 bshmsg,btrain,bswl
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logical*1 first
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logical*1 bshdecode
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logical*1 seenb4
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logical*1 bflag
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logical*1 bvar
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data first/.true./
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data iavpatterns/ &
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1,1,1,1,0,0,0,0, &
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0,0,1,1,1,1,0,0, &
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1,1,1,1,1,0,0,0, &
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1,1,1,1,1,1,1,0/
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data xmc/2.0,4.5,2.5,3.5/ !Used to set time at center of averaging mask
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save first,tsec0,nutc00,pnoise,cdat,msglast,msglastswl, &
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nsnrlast,nsnrlastswl,nhasharray,recent_shmsgs
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! nsnrlast,nsnrlastswl,nhasharray,recent_shmsgs,mycall13
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if(first) then
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tsec0=tsec
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nutc00=nutc0
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pnoise=-1.0
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do i=1,MAXRECENT
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recent_calls(i)(1:13)=' '
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enddo
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do i=1,nshmem
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recent_shmsgs(i)(1:37)=' '
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enddo
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msglast=' '
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msglastswl=' '
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nsnrlast=-99
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nsnrlastswl=-99
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mycall13=mycall//' '
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dxcall13=hiscall//' '
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first=.false.
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endif
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fc=nrxfreq
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! Reset if mycall or dxcall changes
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if(mycall13(1:12).ne.mycall .or. dxcall13(1:12).ne.hiscall) first=.true.
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! Dupe checking setup
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if(nutc00.ne.nutc0 .or. tsec.lt.tsec0) then ! reset dupe checker
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msglast=' '
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msglastswl=' '
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nsnrlast=-99
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nsnrlastswl=-99
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nutc00=nutc0
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endif
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tframe=float(NSPM)/12000.0
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line=char(0)
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msgreceived=' '
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max_iterations=10
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niterations=0
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d(1:NZ)=id2
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rms=sqrt(sum(d(1:NZ)*d(1:NZ))/NZ)
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if(rms.lt.1.0) go to 999
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fac=1.0/rms
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d(1:NZ)=fac*d(1:NZ)
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d(NZ+1:NFFT1)=0.
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bvar=.true.
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if( btrain ) bvar=.false. ! if training, turn off rx eq
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call analytic(d,NZ,NFFT1,cdat,pcoeffs,bvar)
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! Calculate average power for each frame and for the entire block.
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! If decode is successful, largest power will be taken as signal+noise.
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! If no decode, entire-block average will be used to update noise estimate.
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pmax=-99
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do i=1,8
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ib=(i-1)*NSPM+1
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ie=ib+NSPM-1
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pow(i)=real(dot_product(cdat(ib:ie),cdat(ib:ie)))*rms**2
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pmax=max(pmax,pow(i))
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enddo
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pavg=sum(pow)/8.0
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! Short ping decoder uses squared-signal spectrum to determine where to
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! center a 3-frame analysis window and attempts to decode each of the
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! 3 frames along with 2- and 3-frame averages.
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np=8*NSPM
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call msk144spd(cdat,np,ntol,ndecodesuccess,msgreceived,fc,fest,tdec,navg,ct, &
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softbits)
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bshdecode=.false.
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if(ndecodesuccess.eq.0 .and. (bshmsg.or.bswl)) then
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call msk40spd(cdat,np,ntol,mycall,hiscall,bswl,nhasharray, &
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ndecodesuccess,msgreceived,fc,fest,tdec,navg)
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if(ndecodesuccess .ge.1) bshdecode=.true.
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endif
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if( ndecodesuccess .ge. 1 ) then
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tdec=tsec+tdec
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ipk=0
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is=0
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goto 900
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endif
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! If short ping decoder doesn't find a decode,
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! Fast - short ping decoder only.
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! Normal - try 4-frame averages
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! Deep - try 4-, 5- and 7-frame averages.
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npat=NPATTERNS
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if( ndepth .eq. 1 ) npat=0
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if( ndepth .eq. 2 ) npat=2
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do iavg=1,npat
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iavmask=iavpatterns(1:8,iavg)
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navg=sum(iavmask)
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deltaf=10.0/real(navg) ! search increment for frequency sync
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npeaks=2
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call msk144sync(cdat(1:8*NSPM),8,ntol,deltaf,iavmask,npeaks,fc, &
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fest,npkloc,nsyncsuccess,xmax,c)
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if( nsyncsuccess .eq. 0 ) cycle
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do ipk=1,npeaks
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do is=1,3
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ic0=npkloc(ipk)
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if(is.eq.2) ic0=max(1,ic0-1)
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if(is.eq.3) ic0=min(NSPM,ic0+1)
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ct=cshift(c,ic0-1)
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call msk144decodeframe(ct,softbits,msgreceived,ndecodesuccess)
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if(ndecodesuccess .gt. 0) then
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tdec=tsec+xmc(iavg)*tframe
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goto 900
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endif
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enddo !Slicer dither
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enddo !Peak loop
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enddo
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msgreceived=' '
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! no decode - update noise level used for calculating displayed snr.
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if( pnoise .lt. 0 ) then ! initialize noise level
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pnoise=pavg
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elseif( pavg .gt. pnoise ) then ! noise level is slow to rise
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pnoise=0.9*pnoise+0.1*pavg
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elseif( pavg .lt. pnoise ) then ! and quick to fall
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pnoise=pavg
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endif
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go to 999
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900 continue
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! Successful decode - estimate snr
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if( pnoise .gt. 0.0 ) then
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snr0=10.0*log10(pmax/pnoise-1.0)
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else
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snr0=0.0
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endif
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nsnr=nint(snr0)
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if(.not. bshdecode) then
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call msk144signalquality(ct,snr0,fest,tdec,softbits,msgreceived,hiscall, &
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btrain,datadir,ncorrected,eyeopening,pcoeffs)
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endif
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decsym=' & '
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if( btrain ) decsym=' ^ '
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if( bshdecode ) then
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ncorrected=0
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eyeopening=0.0
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endif
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if( nsnr .lt. -8 ) nsnr=-8
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if( nsnr .gt. 24 ) nsnr=24
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! Dupe check.
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bflag=ndecodesuccess.eq.1 .and. &
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(msgreceived.ne.msglast .or. nsnr.gt.nsnrlast .or. tsec.lt.tsec0)
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if(bflag) then
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msglast=msgreceived
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nsnrlast=nsnr
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if(.not. bshdecode) then
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call update_msk40_hasharray(nhasharray)
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endif
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write(line,1021) nutc0,nsnr,tdec,nint(fest),decsym,msgreceived,char(0)
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1021 format(i6.6,i4,f5.1,i5,a4,a37,a1)
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elseif(bswl .and. ndecodesuccess.ge.2) then
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seenb4=.false.
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do i=1,nshmem
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if( msgreceived .eq. recent_shmsgs(i) ) then
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seenb4=.true.
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endif
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enddo
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call update_recent_shmsgs(msgreceived,recent_shmsgs,nshmem)
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bflag=seenb4 .and. &
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(msgreceived.ne.msglastswl .or. nsnr.gt.nsnrlastswl .or. tsec.lt.tsec0) &
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.and. nsnr.gt.-6
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if(bflag) then
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msglastswl=msgreceived
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nsnrlastswl=nsnr
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write(line,1021) nutc0,nsnr,tdec,nint(fest),decsym,msgreceived,char(0)
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endif
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endif
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999 tsec0=tsec
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return
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end subroutine mskrtd
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subroutine update_recent_shmsgs(message,msgs,nsize)
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character*37 msgs(nsize)
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character*37 message
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logical*1 seen
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seen=.false.
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do i=1,nsize
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if( msgs(i) .eq. message ) seen=.true.
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enddo
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if( .not. seen ) then
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do i=nsize,2,-1
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msgs(i)=msgs(i-1)
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enddo
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msgs(1)=message
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endif
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return
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end subroutine update_recent_shmsgs
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