mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-10-31 23:57:10 -04:00
d7e99fa4f2
establishing sync in JT4. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6685 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
429 lines
12 KiB
Fortran
429 lines
12 KiB
Fortran
module jt4_decode
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type :: jt4_decoder
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procedure(jt4_decode_callback), pointer :: decode_callback => null ()
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procedure(jt4_average_callback), pointer :: average_callback => null ()
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contains
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procedure :: decode
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procedure, private :: wsjt4, avg4
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end type jt4_decoder
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! Callback function to be called with each decode
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abstract interface
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subroutine jt4_decode_callback (this, snr, dt, freq, have_sync, &
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sync, is_deep, decoded, qual, ich, is_average, ave)
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import jt4_decoder
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implicit none
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class(jt4_decoder), intent(inout) :: this
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integer, intent(in) :: snr
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real, intent(in) :: dt
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integer, intent(in) :: freq
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logical, intent(in) :: have_sync
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logical, intent(in) :: is_deep
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character(len=1), intent(in) :: sync
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character(len=22), intent(in) :: decoded
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real, intent(in) :: qual
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integer, intent(in) :: ich
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logical, intent(in) :: is_average
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integer, intent(in) :: ave
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end subroutine jt4_decode_callback
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end interface
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! Callback function to be called with each average result
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abstract interface
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subroutine jt4_average_callback (this, used, utc, sync, dt, freq, flip)
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import jt4_decoder
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implicit none
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class(jt4_decoder), intent(inout) :: this
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logical, intent(in) :: used
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integer, intent(in) :: utc
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real, intent(in) :: sync
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real, intent(in) :: dt
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integer, intent(in) :: freq
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logical, intent(in) :: flip
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end subroutine jt4_average_callback
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end interface
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contains
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subroutine decode(this,decode_callback,dd,jz,nutc,nfqso,ntol0,emedelay, &
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dttol,nagain,ndepth,nclearave,minsync,minw,nsubmode,mycall,hiscall, &
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hisgrid,nlist0,listutc0,average_callback)
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use jt4
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use timer_module, only: timer
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class(jt4_decoder), intent(inout) :: this
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procedure(jt4_decode_callback) :: decode_callback
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integer, intent(in) :: jz,nutc,nfqso,ntol0,ndepth,minsync,minw,nsubmode, &
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nlist0,listutc0(10)
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real, intent(in) :: dd(jz),emedelay,dttol
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logical, intent(in) :: nagain, nclearave
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character(len=12), intent(in) :: mycall,hiscall
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character(len=6), intent(in) :: hisgrid
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procedure(jt4_average_callback), optional :: average_callback
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real*4 dat(30*11025)
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character*6 cfile6
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this%decode_callback => decode_callback
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if (present (average_callback)) then
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this%average_callback => average_callback
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end if
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mode4=nch(nsubmode+1)
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ntol=ntol0
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neme=0
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lumsg=6 !### temp ? ###
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ndiag=1
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nlist=nlist0
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listutc=listutc0
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! Lowpass filter and decimate by 2
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call timer('lpf1 ',0)
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call lpf1(dd,jz,dat,jz2)
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call timer('lpf1 ',1)
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write(cfile6(1:4),1000) nutc
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1000 format(i4.4)
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cfile6(5:6)=' '
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call timer('wsjt4 ',0)
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call this%wsjt4(dat,jz2,nutc,NClearAve,minsync,ntol,emedelay,dttol,mode4, &
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minw,mycall,hiscall,hisgrid,nfqso,NAgain,ndepth,neme)
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call timer('wsjt4 ',1)
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return
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end subroutine decode
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subroutine wsjt4(this,dat,npts,nutc,NClearAve,minsync,ntol,emedelay,dttol, &
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mode4,minw,mycall,hiscall,hisgrid,nfqso,NAgain,ndepth,neme)
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! Orchestrates the process of decoding JT4 messages. Note that JT4
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! always operates as if in "Single Decode" mode; it looks for only one
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! decodable signal in the FTol range.
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use jt4
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use timer_module, only: timer
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class(jt4_decoder), intent(inout) :: this
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integer, intent(in) :: npts,nutc,minsync,ntol,mode4,minw, &
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nfqso,ndepth,neme
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logical, intent(in) :: NAgain,NClearAve
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character(len=12), intent(in) :: mycall,hiscall
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character(len=6), intent(in) :: hisgrid
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real, intent(in) :: dat(npts) !Raw data
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real z(458,65)
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logical first,prtavg
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character decoded*22,special*5
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character*22 avemsg,deepmsg,deepave,blank,deepmsg0,deepave1
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character csync*1
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data first/.true./,nutc0/-999/,nfreq0/-999999/
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save
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if(first) then
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nsave=0
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first=.false.
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blank=' '
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ccfblue=0.
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ccfred=0.
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endif
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zz=0.
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syncmin=3.0 + minsync
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naggressive=0
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if(ndepth.ge.2) naggressive=1
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nq1=3
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nq2=6
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if(naggressive.eq.1) nq1=1
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if(NClearAve) then
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nsave=0
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iutc=-1
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nfsave=0.
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listutc=0
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ppsave=0.
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rsymbol=0.
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dtsave=0.
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syncsave=0.
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nfanoave=0
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ndeepave=0
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endif
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! Attempt to synchronize: look for sync pattern, get DF and DT.
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call timer('sync4 ',0)
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call sync4(dat,npts,mode4,minw)
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call timer('sync4 ',1)
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call timer('zplt ',0)
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do ich=1,7
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z(1:458,1:65)=zz(274:731,1:65,ich)
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call zplt(z,ich-4,syncz,dtxz,nfreqz,flipz,sync2z,0,emedelay,dttol, &
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nfqso,ntol)
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enddo
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call timer('zplt ',1)
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! Use results from zplt
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!### NB: JT4 is severely "sync limited" at present... (Maybe not still true???)
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!### TESTS ONLY! ###
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nfreqz=1000
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dtxz=0.0
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flipz=1.0
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syncz=5.0
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!###
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flip=flipz
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sync=syncz
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snrx=db(sync) - 26.
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nsnr=nint(snrx)
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if(sync.lt.syncmin) then
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if (associated (this%decode_callback)) then
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call this%decode_callback(nsnr,dtxz,nfreqz,.false.,csync, &
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.false.,decoded,0.,ich,.false.,0)
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end if
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go to 990
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endif
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! We have achieved sync
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decoded=blank
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deepmsg=blank
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special=' '
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nsync=sync
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nsnrlim=-33
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csync='*'
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if(flip.lt.0.0) csync='#'
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qbest=0.
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qabest=0.
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prtavg=.false.
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do idt=-2,2
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dtx=dtxz + 0.03*idt
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nfreq=nfreqz + 2*idf
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! Attempt a single-sequence decode, including deep4 if Fano fails.
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call timer('decode4 ',0)
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call decode4(dat,npts,dtx,nfreq,flip,mode4,ndepth,neme,minw, &
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mycall,hiscall,hisgrid,decoded,nfano,deepmsg,qual,ich)
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call timer('decode4 ',1)
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if(nfano.gt.0) then
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! Fano succeeded: report the message and return !Fano OK
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if (associated (this%decode_callback)) then
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call this%decode_callback(nsnr,dtx,nfreq,.true.,csync, &
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.false.,decoded,99.,ich,.false.,0)
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end if
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nsave=0
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go to 990
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else !Fano failed
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if(qual.gt.qbest) then
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dtx0=dtx
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nfreq0=nfreq
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deepmsg0=deepmsg
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ich0=ich
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qbest=qual
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endif
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endif
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if(idt.ne.0) cycle
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! Single-sequence Fano decode failed, so try for an average Fano decode:
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qave=0.
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! If this is a new minute or a new frequency, call avg4
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if(.not. prtavg) then
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if(nutc.ne.nutc0 .or. abs(nfreq-nfreq0).gt.ntol) then
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! This is a new minute or a new frequency, so call avg4.
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nutc0=nutc !Try decoding average
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nfreq0=nfreq
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nsave=nsave+1
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nsave=mod(nsave-1,64)+1
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call timer('avg4 ',0)
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call this%avg4(nutc,sync,dtx,flip,nfreq,mode4,ntol,ndepth,neme, &
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mycall,hiscall,hisgrid,nfanoave,avemsg,qave,deepave,ich, &
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ndeepave)
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call timer('avg4 ',1)
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endif
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if(nfanoave.gt.0) then
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! Fano succeeded: report the message AVG FANO OK
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if (associated (this%decode_callback)) then
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call this%decode_callback(nsnr,dtx,nfreq,.true.,csync, &
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.false.,avemsg,99.,ich,.true.,nfanoave)
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end if
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prtavg=.true.
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cycle
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else
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if(qave.gt.qabest) then
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dtx1=dtx
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nfreq1=nfreq
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deepave1=deepave
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ich1=ich
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qabest=qave
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endif
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endif
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endif
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enddo
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dtx=dtx0
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nfreq=nfreq0
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deepmsg=deepmsg0
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ich=ich0
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qual=qbest
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if (associated (this%decode_callback)) then
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if(int(qual).ge.nq1) then
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call this%decode_callback(nsnr,dtx,nfreqz,.true.,csync,.true., &
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deepmsg,qual,ich,.false.,0)
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else
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call this%decode_callback(nsnr,dtxz,nfreqz,.true.,csync, &
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.false.,blank,0.,ich,.false.,0)
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endif
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end if
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dtx=dtx1
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nfreq=nfreq1
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deepave=deepave1
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ich=ich1
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qave=qabest
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if (associated (this%decode_callback) .and. ndeepave.ge.2) then
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if(int(qave).ge.nq1) then
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call this%decode_callback(nsnr,dtx,nfreq,.true.,csync,.true., &
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deepave,qave,ich,.true.,ndeepave)
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endif
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end if
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990 return
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end subroutine wsjt4
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subroutine avg4(this,nutc,snrsync,dtxx,flip,nfreq,mode4,ntol,ndepth,neme, &
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mycall,hiscall,hisgrid,nfanoave,avemsg,qave,deepave,ichbest,ndeepave)
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! Decodes averaged JT4 data
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use jt4
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class(jt4_decoder), intent(inout) :: this
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character*22 avemsg,deepave,deepbest
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character mycall*12,hiscall*12,hisgrid*6
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character*1 csync,cused(64)
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real sym(207,7)
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integer iused(64)
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logical first
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data first/.true./
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save
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if(first) then
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iutc=-1
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nfsave=0
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dtdiff=0.2
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first=.false.
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endif
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do i=1,64
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if(nutc.eq.iutc(i) .and. abs(nhz-nfsave(i)).le.ntol) go to 10
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enddo
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! Save data for message averaging
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iutc(nsave)=nutc
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syncsave(nsave)=snrsync
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dtsave(nsave)=dtxx
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nfsave(nsave)=nfreq
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flipsave(nsave)=flip
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ppsave(1:207,1:7,nsave)=rsymbol(1:207,1:7)
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10 sym=0.
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syncsum=0.
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dtsum=0.
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nfsum=0
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nsum=0
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do i=1,64
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cused(i)='.'
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if(iutc(i).lt.0) cycle
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if(mod(iutc(i),2).ne.mod(nutc,2)) cycle !Use only same sequence
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if(abs(dtxx-dtsave(i)).gt.dtdiff) cycle !DT must match
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if(abs(nfreq-nfsave(i)).gt.ntol) cycle !Freq must match
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if(flip.ne.flipsave(i)) cycle !Sync (*/#) must match
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sym(1:207,1:7)=sym(1:207,1:7) + ppsave(1:207,1:7,i)
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syncsum=syncsum + syncsave(i)
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dtsum=dtsum + dtsave(i)
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nfsum=nfsum + nfsave(i)
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cused(i)='$'
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nsum=nsum+1
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iused(nsum)=i
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enddo
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if(nsum.lt.64) iused(nsum+1)=0
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syncave=0.
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dtave=0.
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fave=0.
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if(nsum.gt.0) then
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sym=sym/nsum
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syncave=syncsum/nsum
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dtave=dtsum/nsum
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fave=float(nfsum)/nsum
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endif
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do i=1,nsave
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csync='*'
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if(flipsave(i).lt.0.0) csync='#'
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if (associated (this%average_callback)) then
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call this%average_callback(cused(i) .eq. '$',iutc(i), &
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syncsave(i) - 5.,dtsave(i),nfsave(i),flipsave(i) .lt.0.)
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end if
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enddo
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sqt=0.
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sqf=0.
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do j=1,64
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i=iused(j)
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if(i.eq.0) exit
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csync='*'
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if(flipsave(i).lt.0.0) csync='#'
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sqt=sqt + (dtsave(i)-dtave)**2
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sqf=sqf + (nfsave(i)-fave)**2
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enddo
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rmst=0.
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rmsf=0.
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if(nsum.ge.2) then
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rmst=sqrt(sqt/(nsum-1))
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rmsf=sqrt(sqf/(nsum-1))
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endif
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kbest=ich1
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do k=ich1,ich2
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call extract4(sym(1,k),ncount,avemsg) !Do the Fano decode
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nfanoave=0
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if(ncount.ge.0) then
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ichbest=k
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nfanoave=nsum
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go to 900
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endif
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if(nch(k).ge.mode4) exit
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enddo
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deepave=' '
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qave=0.
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! Possibly should pass nadd=nused, also ?
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if(iand(ndepth,32).eq.32) then
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flipx=1.0 !Normal flip not relevant for ave msg
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qbest=0.
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do k=ich1,ich2
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call deep4(sym(2,k),neme,flipx,mycall,hiscall,hisgrid,deepave,qave)
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if(qave.gt.qbest) then
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qbest=qave
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deepbest=deepave
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kbest=k
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ndeepave=nsum
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endif
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if(nch(k).ge.mode4) exit
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enddo
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deepave=deepbest
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qave=qbest
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ichbest=kbest
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endif
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900 return
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end subroutine avg4
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end module jt4_decode
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