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https://github.com/saitohirga/WSJT-X.git
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First decodes of wide/slow JT9 submodes from within wsjtx.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6577 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Joe Taylor
parent
acc2ea0c48
commit
e212367221
@ -297,6 +297,7 @@ set (wsjt_FSRCS
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lib/decode4.f90
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lib/decode65a.f90
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lib/decode65b.f90
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lib/decode9w.f90
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lib/decoder.f90
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lib/deep4.f90
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lib/deg2grid.f90
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@ -395,6 +396,7 @@ set (wsjt_FSRCS
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lib/smo121.f90
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lib/softsym.f90
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lib/softsym9f.f90
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lib/softsym9w.f90
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lib/shell.f90
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lib/spec9f.f90
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lib/stdmsg.f90
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@ -407,6 +409,7 @@ set (wsjt_FSRCS
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lib/sync65.f90
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lib/sync9.f90
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lib/sync9f.f90
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lib/sync9w.f90
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lib/synciscat.f90
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lib/syncmsk.f90
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lib/timer_C_wrapper.f90
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@ -1,26 +1,30 @@
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subroutine decode9w(nutc,nfqso,ntol,nsubmode,ss,id2)
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subroutine decode9w(nutc,nfqso,ntol,nsubmode,ss,id2,sync,nsnr,xdt1,f0,decoded)
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! Decode a weak signal in a wide/slow JT9 submode.
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parameter (NSMAX=6827,NZMAX=60*12000)
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real ss(184,NSMAX)
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real ccfred(NSMAX)
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real ccfblue(-9:18)
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real a(5)
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integer*2 id2(NZMAX)
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integer*1 i1SoftSymbols(207)
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character*22 decoded
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real ss(184,NSMAX) !Symbol spectra at 1/2-symbol steps
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real ccfred(NSMAX) !Best sync vs frequency
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real ccfblue(-9:18) !Sync vs time at best frequency
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real a(5) !Fitted Lorentzian params
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integer*2 id2(NZMAX) !Raw 16-bit data
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integer*1 i1SoftSymbols(207) !Binary soft symbols
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character*22 decoded !Decoded message
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df=12000.0/16384.0
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nsps=6912
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tstep=nsps*0.5/12000.0
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df=12000.0/16384.0 !Bin spacing in ss()
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nsps=6912 !Samples per 9-FSK symbol
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tstep=nsps*0.5/12000.0 !Half-symbol duration
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npts=52*12000
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limit=10000
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ntol=100
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limit=10000 !Fano timeout parameter
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ia=nint((nfqso-ntol)/df)
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ib=nint((nfqso+ntol)/df)
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lag1=-int(2.5/tstep + 0.9999)
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lag2=int(5.0/tstep + 0.9999)
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nhsym=184
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ia=nint((nfqso-ntol)/df) !Start frequency bin
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ib=nint((nfqso+ntol)/df) !End frequency bin
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lag1=-int(2.5/tstep + 0.9999) !Start lag
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lag2=int(5.0/tstep + 0.9999) !End lag
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nhsym=184 !Number of half-symbols
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! First sync pass finds approximate Doppler spread; second pass does a
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! good Lorentzian fit to determine frequency f0.
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do iter=1,2
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nadd=3
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if(iter.eq.2) nadd=2*nint(0.375*a(4)) + 1
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@ -30,28 +34,16 @@ subroutine decode9w(nutc,nfqso,ntol,nsubmode,ss,id2)
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ccfblue(lagpk)**2 - ccfblue(lagpk+1)**2
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base=sum1/25.0
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rms=sqrt(sq/24.0)
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snr=(ccfblue(lagpk)-base)/rms
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nsnr=nint(db(snr)-29.7)
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sync=(ccfblue(lagpk)-base)/rms
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nsnr=nint(db(sync)-29.7)
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xdt0=lagpk*tstep
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call lorentzian(ccfred(ia),ib-ia+1,a)
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f0=(ia+a(3))*df
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! write(*,3001) nadd,a,base,rms,snr,xdt,f0,ipk,lagpk
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!3001 format(i3,9f7.2,f7.1,2i5)
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ccfblue=(ccfblue-base)/rms
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! rewind 16
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! do lag=lag1,lag2
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! write(16,3002) lag*tstep,ccfblue(lag)
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!3002 format(2f10.3)
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! enddo
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enddo
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call softsym9w(id2,npts,xdt0,f0,a(4)*df,nsubmode,xdt1,i1softsymbols)
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call jt9fano(i1softsymbols,limit,nlim,decoded)
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write(*,1100) nutc,nsnr,xdt1-1.0,nint(f0),decoded,nlim
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1100 format(i4.4,i4,f5.1,i5,1x,'@',1x,a22,i10)
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return
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end subroutine decode9w
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@ -96,7 +96,7 @@ subroutine multimode_decoder(ss,id2,params,nfsample)
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call my_jt9%decode(jt9_decoded,ss,id2,params%nutc,params%nfqso, &
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newdat9,params%npts8,params%nfa,params%nfsplit,params%nfb, &
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params%ntol,params%nzhsym,logical(params%nagain),params%ndepth, &
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params%nmode,params%nsubmode)
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params%nmode,params%nsubmode,params%nexp_decode)
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call timer('decjt9 ',1)
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endif
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@ -118,7 +118,7 @@ subroutine multimode_decoder(ss,id2,params,nfsample)
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call my_jt9%decode(jt9_decoded,ss,id2,params%nutc,params%nfqso, &
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newdat9,params%npts8,params%nfa,params%nfsplit,params%nfb, &
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params%ntol,params%nzhsym,logical(params%nagain), &
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params%ndepth,params%nmode,params%nsubmode)
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params%ndepth,params%nmode,params%nsubmode,params%nexp_decode)
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call timer('decjt9 ',1)
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end if
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endif
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@ -25,7 +25,7 @@ module jt9_decode
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contains
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subroutine decode(this,callback,ss,id2,nutc,nfqso,newdat,npts8,nfa, &
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nfsplit,nfb,ntol,nzhsym,nagain,ndepth,nmode,nsubmode)
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nfsplit,nfb,ntol,nzhsym,nagain,ndepth,nmode,nsubmode,nexp_decode)
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use timer_module, only: timer
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include 'constants.f90'
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@ -43,9 +43,16 @@ contains
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common/decstats/ntry65a,ntry65b,n65a,n65b,num9,numfano
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save ccfred,red2
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! write(60) nutc,nfqso,ntol,ndepth,nmode,nsubmode,nzhsym,ss,id2(1:60*12000)
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this%callback => callback
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if(nmode.eq.9 .and. nsubmode.ge.1) then
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call decode9w(nutc,nfqso,ntol,nsubmode,ss,id2,sync,nsnr,xdt,freq,msg)
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if (associated(this%callback)) then
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ndrift=0
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call this%callback(nutc,sync,nsnr,xdt,freq,ndrift,msg)
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end if
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go to 999
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endif
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nsynced=0
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ndecoded=0
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nsps=6912 !Params for JT9-1
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@ -160,6 +167,6 @@ contains
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if(nagain) exit
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enddo
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return
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999 return
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end subroutine decode
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end module jt9_decode
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@ -5,6 +5,7 @@ program jt9w
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real ref(NSMAX)
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integer*2 id2(NZMAX)
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character*12 arg
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character*22 decoded
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call getarg(1,arg)
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read(arg,*) iutc
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@ -17,7 +18,11 @@ program jt9w
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do ifile=1,999
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read(60,end=999) nutc,nfqso,ntol,ndepth,nmode,nsubmode,ss,id2
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if(nutc.ne.iutc) cycle
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call decode9w(nutc,nfqso,ntol,nsubmode,ss,id2)
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ntol=100
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call decode9w(nutc,nfqso,ntol,nsubmode,ss,id2,sync,nsnr,xdt,freq,decoded)
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write(*,1100) nutc,nsnr,xdt1-1.0,nint(freq),decoded
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1100 format(i4.4,i4,f5.1,i5,1x,'@',1x,a22)
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exit
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enddo
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999 end program jt9w
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