mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-03 07:51:16 -05:00
151 lines
5.4 KiB
Fortran
151 lines
5.4 KiB
Fortran
program jt49sim
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! Generate simulated data for testing JT4 and JT9
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! April 26, 2020: changed to Watterson channel simulator (K9AN)
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!
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use wavhdr
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use packjt
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use jt4
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parameter (NMAX=60*12000) ! = 648,000
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parameter (NFFT=10*65536,NH=NFFT/2)
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type(hdr) h !Header for .wav file
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integer*2 iwave(NMAX) !Generated waveform
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integer*4 itone(206) !Channel symbols (values 0-8)
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real*4 xnoise(NMAX) !Generated random noise
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real*4 dat(NMAX) !Generated real data
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complex cdat(NMAX) !Generated complex waveform
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complex c0(NMAX) !Waveform multipled by fading realization
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complex z
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real*8 f0,dt,twopi,phi,dphi,baud,fsample,freq,dnsps
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character message*22,fname*11,csubmode*2,arg*12
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character msgsent*22
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nargs=iargc()
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if(nargs.ne. 8) then
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print *, 'Usage: jt49sim "msg" nA-nE Nsigs fDop delay DT Nfiles SNR'
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print *, 'Example: jt49sim "K1ABC W9XYZ EN37" 4G 10 0.2 1.0 0.0 1 0'
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print *, 'Example: jt49sim "K1ABC W9XYZ EN37" 9A 1 0.0 0.0 0.0 1 -20'
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print *, 'Use msg=@nnnn to generate a tone at nnnn Hz:'
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print *, 'Example: jt49sim "@1500" 9A 1 10.0 0.0 0.0 1 -20'
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print *, 'If Nsigs > 100, generate one signal with f0=Nsigs'
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print *, 'Example: jt49sim "K1ABC W9XYZ EN37" 4F 1800 0.2 0.0 0.0 1 -20'
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go to 999
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endif
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call getarg(1,message)
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call fmtmsg(message, iz)
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call getarg(2,csubmode)
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imode=ichar(csubmode(1:1)) - ichar('0')
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nsubmode=ichar(csubmode(2:2)) - ichar('A')
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if(imode.ne.4 .and. imode.ne.9) go to 999
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if(nsubmode.lt.0 .or. nsubmode.gt.7) go to 999
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call getarg(3,arg)
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read(arg,*) nsigs
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call getarg(4,arg)
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read(arg,*) fspread
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call getarg(5,arg)
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read(arg,*) delay
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call getarg(6,arg)
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read(arg,*) xdt
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call getarg(7,arg)
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read(arg,*) nfiles
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call getarg(8,arg)
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read(arg,*) snrdb
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rms=100.
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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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h=default_header(12000,NMAX)
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dfsig=2000.0/nsigs !Freq spacing between sigs in file (Hz)
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ichk=0
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nsym=0
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dnsps=0.
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baud=0.
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sig=0.
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if(imode.eq.4) then
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nsym=206 !Number of channel symbols (JT4)
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dnsps=12000.d0/4.375d0
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baud=12000.d0/dnsps !Keying rate = 1.7361111111
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else if(imode.eq.9) then
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nsym=85 !Number of channel symbols (JT9)
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dnsps=6912.d0 !Samples per symbol
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baud=12000.d0/dnsps !Keying rate = 1.736...
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endif
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NZ=nsym*dnsps
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write(*,1000)
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1000 format('File Sig Freq Mode S/N DT fDop delay Message'/60('-'))
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do ifile=1,nfiles !Loop over requested number of files
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write(fname,1002) ifile !Output filename
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1002 format('000000_',i4.4)
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open(10,file=fname//'.wav',access='stream',status='unknown')
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xnoise=0.
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cdat=0.
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if(snrdb.lt.90) then
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do i=1,NMAX
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xnoise(i)=gran() !Generate gaussian noise
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enddo
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endif
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do isig=1,nsigs !Generate requested number of sigs
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if(mod(nsigs,2).eq.0) f0=1500.0 + dfsig*(isig-0.5-nsigs/2)
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if(mod(nsigs,2).eq.1) f0=1500.0 + dfsig*(isig-(nsigs+1)/2)
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if(nsigs.eq.1) f0=1500.0
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if(nsigs.gt.100) f0=nsigs
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xsnr=snrdb
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if(snrdb.eq.0.0) xsnr=-20 - isig
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if(imode.eq.4) call gen4(message,ichk,msgsent,itone,itype)
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if(imode.eq.9) call gen9(message,ichk,msgsent,itone,itype)
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bandwidth_ratio=2500.0/6000.0
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sig=sqrt(2*bandwidth_ratio)*10.0**(0.05*xsnr)
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if(xsnr.gt.90.0) sig=1.0
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write(*,1020) ifile,isig,f0,csubmode,xsnr,xdt,fspread,delay,message
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1020 format(i4,i4,f10.3,2x,a2,2x,f5.1,f6.2,f6.1,1x,f6.1,2x,a22)
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phi=0.d0
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dphi=0.d0
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k=(xdt+1.0)*12000 !Start audio at t = xdt + 1.0 s
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isym0=-99
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do i=1,NMAX !Add this signal into cdat()
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isym=i/dnsps + 1
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if(isym.gt.nsym) exit
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if(isym.ne.isym0) then
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if(message(1:1).eq.'@') then
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read(message(2:),*) freq
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else
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if(imode.eq.4) freq=f0 + itone(isym)*baud*nch(1+nsubmode) !JT4
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if(imode.eq.9) freq=f0 + itone(isym)*baud*(2**nsubmode) !JT9
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endif
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dphi=twopi*freq*dt
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isym0=isym
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endif
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phi=phi + dphi
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if(phi.gt.twopi) phi=phi-twopi
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xphi=phi
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z=cmplx(cos(xphi),sin(xphi))
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k=k+1
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if(k.ge.1) cdat(k)=cdat(k) + z
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enddo
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if(nsigs.gt.100) exit
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enddo
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c0=cdat
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if(fspread.ne.0 .or. delay.ne.0) then !Apply specified Doppler spread
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fs=12000.0
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call watterson(c0,NMAX,NZ,fs,delay,fspread)
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endif
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dat=sig*aimag(c0) + xnoise !Add the generated noise
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fac=32767.0/nsigs
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if(snrdb.ge.90.0) iwave(1:NMAX)=nint(fac*dat(1:NMAX))
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if(snrdb.lt.90.0) iwave(1:NMAX)=nint(rms*dat(1:NMAX))
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write(10) h,iwave(1:NMAX) !Save the .wav file
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close(10)
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enddo
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999 end program jt49sim
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