176 lines
5.6 KiB
Plaintext
176 lines
5.6 KiB
Plaintext
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program jt9sim
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! Generate simulated data for testing of WSJT-X
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use wavhdr
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use packjt
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parameter (NTMAX=120)
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parameter (NMAX=NTMAX*12000)
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type(hdr) h
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integer*2 iwave(NMAX) !Generated waveform (no noise)
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real*4 dat(NMAX)
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real*8 f0,f,dt,twopi,phi,dphi,baud,fspan,fsample,freq
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character msg*22,msg0*22,message*22,msgsent*22,arg*8,fname*11
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integer*4 i4tone(85) !Channel symbols (values 0-8)
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integer*4 i4DataSymNoGray(69) !Data Symbols, values 0-7
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integer*1 i1ScrambledBits(207) !Unpacked bits, scrambled order
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integer*1 i1Bits(207) !Encoded information-carrying bits
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integer*1 i1SoftSymbols(207)
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include 'jt9sync.f90'
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nargs=iargc()
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if(nargs.ne.6) then
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print*,'Usage: jt9sim "message" fspan nsigs minutes SNR nfiles'
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print*,'Example: jt9sim "CQ K1ABC FN42" 200 20 2 -28 1'
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print*,' '
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print*,'Enter message = "" to use entries in msgs.txt.'
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print*,'Enter SNR = 0 to generate a range of SNRs.'
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print*,'Enter SNR = 99 to generate a noiseless signal at frequency fspan'
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go to 999
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endif
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call getarg(1,msg0)
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call fmtmsg(msg0,iz)
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message=msg0 !Transmitted message
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call getarg(2,arg)
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read(arg,*) fspan !Total freq range (Hz)
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call getarg(3,arg)
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read(arg,*) nsigs !Number of signals in each file
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call getarg(4,arg)
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read(arg,*) minutes !Length of file (1 2 5 10 30 minutes)
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call getarg(5,arg)
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read(arg,*) snrdb !S/N in dB (2500 hz reference BW)
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call getarg(6,arg)
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read(arg,*) nfiles !Number of files
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rmsdb=25.
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rms=10.0**(0.05*rmsdb)
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fsample=12000.d0 !Sample rate (Hz)
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dt=1.d0/fsample !Sample interval (s)
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twopi=8.d0*atan(1.d0)
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npts=12000*(60*minutes-6)
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nsps=0
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if(minutes.eq.1) nsps=6912
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if(minutes.eq.2) nsps=15360
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if(minutes.eq.5) nsps=40960
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if(minutes.eq.10) nsps=82944
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if(minutes.eq.30) nsps=252000
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if(nsps.eq.0) stop 'Bad value for minutes.'
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f0=1400.d0 !Center frequency (Hz)
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! f0=3000.d0 !Center frequency (Hz)
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! f0=1500.0
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! if(minutes.eq.5) f0=1100.
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! if(minutes.eq.10) f0=1050.
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! if(minutes.eq.30) f0=1025.
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call init_random_seed() ! seed Fortran RANDOM_NUMBER generator
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call sgran() ! see C rand generator (used in gran)
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h=default_header(12000,npts)
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k=0 !Silence compiler warning
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if(msg0(1:3).eq.'sin') read(msg0(4:),*) sinfreq
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if(message.eq."") open(12,file='msgs.txt',status='old')
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write(*,1000)
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1000 format('File N freq S/N Message'/ &
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'---------------------------------------------------')
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do ifile=1,nfiles !Loop over all files
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nmin=(ifile-1)*minutes
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ihr=nmin/60
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imin=mod(nmin,60)
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write(fname,1002) ihr,imin !Create output filename
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1002 format('000000_',2i2.2)
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open(10,file=fname//'.wav',access='stream',status='unknown')
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if(snrdb.lt.90) then
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do i=1,npts
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dat(i)=gran()
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enddo
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else
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dat(1:npts)=0.
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endif
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if(msg0.ne.' ') then
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call gen9(message,0,msgsent,i4tone,itype) !Encode message into tone #s
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endif
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rewind 12
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do isig=1,nsigs !Loop over multiple signals
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if(msg0.eq.' ') then
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read(12,1004) message !Use pre-generated message texts
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1004 format(a22)
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call gen9(message,0,msgsent,i4tone,itype)
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endif
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f=f0
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if(nsigs.gt.1) f=f0 - 0.5d0*fspan + fspan*(isig-1.d0)/(nsigs-1.d0)
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snrdbx=snrdb
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! snrdbx=snrdb + (ifile-1)*4.0
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sig=10.0**(0.05*snrdbx)
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if(snrdb.gt.90.0) sig=1.0
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write(*,1020) ifile,isig,f,snrdbx,msgsent
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1020 format(i3,i4,f10.3,f7.1,2x,a22)
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phi=0.
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baud=12000.d0/nsps
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k=12000 !Start audio at t = 1.0 s
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! f1=0.0001 * (ifile-1)
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f1=0.
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! print*,ifile-1,f1
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dphi2=0.
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ddphi2=twopi*f1*dt/60.0
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do isym=1,85
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freq=f + i4tone(isym)*baud
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if(msg0(1:3).eq.'sin') freq=sinfreq
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dphi=twopi*freq*dt + dphi2
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do i=1,nsps
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phi=phi + dphi
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dphi2=dphi2 + ddphi2
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if(phi.lt.-twopi) phi=phi+twopi
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if(phi.gt.twopi) phi=phi-twopi
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xphi=phi
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k=k+1
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dat(k)=dat(k) + sig*sin(xphi) !Use lookup table for i*2 sin(x) ?
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enddo
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enddo
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enddo
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fac=32767.0/nsigs
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if(snrdb.ge.90.0) iwave(1:npts)=nint(fac*dat(1:npts))
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if(snrdb.lt.90.0) iwave(1:npts)=nint(rms*dat(1:npts))
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write(10) h,iwave(1:npts)
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close(10)
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! We're done! Now decode the data symbols from i4tone, as a test.
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if(msg0.ne.' ') then
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j=0
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do i=1,85
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if(isync(i).eq.1) cycle
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j=j+1
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i4DataSymNoGray(j)=igray(i4tone(i)-1,-1)
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enddo
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call unpackbits(i4DataSymNoGray,69,3,i1ScrambledBits)
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call interleave9(i1ScrambledBits,-1,i1Bits)
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do i=1,206
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i4=-10
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if(i1Bits(i).eq.1) i4=10
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i1SoftSymbols(i)=i4
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enddo
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limit=1000
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call jt9fano(i1SoftSymbols,limit,nlim,msg)
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if(msg.ne.msg0) print*,'Decode error: ',msg0,' ',msg
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endif
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enddo
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999 end program jt9sim
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