173 lines
5.9 KiB
Plaintext
173 lines
5.9 KiB
Plaintext
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program ft8sim
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! Generate simulated data for a 15-second HF/6m mode using 8-FSK.
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! Output is saved to a *.wav file.
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use wavhdr
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include 'ft8_params.f90' !Set various constants
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parameter (NWAVE=NN*NSPS)
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type(hdr) h !Header for .wav file
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character arg*12,fname*17
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character msg40*40,msg*22,msgsent*22,msg0*22
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character*6 mygrid6
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logical bcontest
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complex c0(0:NMAX-1)
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complex c(0:NMAX-1)
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real wave(NMAX)
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integer itone(NN)
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integer*1 msgbits(KK)
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integer*2 iwave(NMAX) !Generated full-length waveform
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data mygrid6/'EM48 '/
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! Get command-line argument(s)
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nargs=iargc()
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if(nargs.ne.8) then
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print*,'Usage: ft8sim "message" nsig|f0 DT fdop del width nfiles snr'
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print*,'Examples: ft8sim "K1ABC W9XYZ EN37" 1500.0 0.0 0.1 1.0 0 10 -18'
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print*,' ft8sim "K1ABC W9XYZ EN37" 10 0.0 0.1 1.0 25 10 -18'
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print*,' ft8sim "K1ABC W9XYZ EN37" 25 0.0 0.1 1.0 25 10 -18'
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print*,' ft8sim "K1ABC RR73; W9XYZ <KH1/KH7Z> -11" 300 0 0 0 25 1 -10'
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print*,'Make nfiles negative to invoke 72-bit contest mode.'
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go to 999
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endif
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call getarg(1,msg40) !Message to be transmitted
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call getarg(2,arg)
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read(arg,*) f0 !Frequency (only used for single-signal)
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call getarg(3,arg)
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read(arg,*) xdt !Time offset from nominal (s)
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call getarg(4,arg)
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read(arg,*) fspread !Watterson frequency spread (Hz)
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call getarg(5,arg)
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read(arg,*) delay !Watterson delay (ms)
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call getarg(6,arg)
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read(arg,*) width !Filter transition width (Hz)
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call getarg(7,arg)
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read(arg,*) nfiles !Number of files
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call getarg(8,arg)
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read(arg,*) snrdb !SNR_2500
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nsig=1
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if(f0.lt.100.0) then
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nsig=f0
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f0=1500
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endif
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bcontest=nfiles.lt.0
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nfiles=abs(nfiles)
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twopi=8.0*atan(1.0)
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fs=12000.0 !Sample rate (Hz)
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dt=1.0/fs !Sample interval (s)
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tt=NSPS*dt !Duration of symbols (s)
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baud=1.0/tt !Keying rate (baud)
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bw=8*baud !Occupied bandwidth (Hz)
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txt=NZ*dt !Transmission length (s)
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bandwidth_ratio=2500.0/(fs/2.0)
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sig=sqrt(2*bandwidth_ratio) * 10.0**(0.05*snrdb)
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if(snrdb.gt.90.0) sig=1.0
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txt=NN*NSPS/12000.0
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! Source-encode, then get itone()
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if(index(msg40,';').le.0) then
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i3bit=0
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msg=msg40(1:22)
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call genft8(msg,mygrid6,bcontest,i3bit,msgsent,msgbits,itone)
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write(*,1000) f0,xdt,txt,snrdb,bw,msgsent
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1000 format('f0:',f9.3,' DT:',f6.2,' TxT:',f6.1,' SNR:',f6.1, &
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' BW:',f4.1,2x,a22)
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else
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call foxgen_wrap(msg40,msgbits,itone)
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write(*,1001) f0,xdt,txt,snrdb,bw,msg40
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1001 format('f0:',f9.3,' DT:',f6.2,' TxT:',f6.1,' SNR:',f6.1, &
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' BW:',f4.1,2x,a40)
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endif
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write(*,1030) msgbits(1:56)
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1030 format(/'Call1: ',28i1,' Call2: ',28i1)
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write(*,1032) msgbits(57:72),msgbits(73:75),msgbits(76:87)
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1032 format('Grid: ',16i1,' 3Bit: ',3i1,' CRC12: ',12i1)
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write(*,1034) itone
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1034 format(/'Channel symbols:'/79i1/)
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msg0=msg
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do ifile=1,nfiles
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c=0.
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do isig=1,nsig
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c0=0.
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if(nsig.eq.2) then
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if(index(msg,'R-').gt.0) f0=500
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i1=index(msg,' ')
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msg(i1+4:i1+4)=char(ichar('A')+isig-1)
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if(isig.eq.2) then
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f0=f0+100
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endif
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call genft8(msg,mygrid6,bcontest,i3bit,msgsent,msgbits,itone)
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endif
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if(nsig.eq.25) then
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f0=(isig+2)*100.0
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else if(nsig.eq.50) then
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msg=msg0
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f0=1000.0 + (isig-1)*60.0
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i1=index(msg,' ')
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i2=index(msg(i1+1:),' ') + i1
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msg(i1+2:i1+2)=char(ichar('0')+mod(isig-1,10))
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msg(i1+3:i1+3)=char(ichar('A')+mod(isig-1,26))
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msg(i1+4:i1+4)=char(ichar('A')+mod(isig-1,26))
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msg(i1+5:i1+5)=char(ichar('A')+mod(isig-1,26))
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write(msg(i2+3:i2+4),'(i2.2)') isig-1
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if(ifile.ge.2 .and. isig.eq.ifile-1) then
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write(msg(i2+1:i2+4),1002) -isig
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1002 format('R',i3.2)
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f0=600.0 + mod(isig-1,5)*60.0
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endif
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call genft8(msg,mygrid6,bcontest,i3bit,msgsent,msgbits,itone)
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endif
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k=-1 + nint((xdt+0.5+0.01*gran())/dt)
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! k=-1 + nint((xdt+0.5)/dt)
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ia=k+1
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phi=0.0
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do j=1,NN !Generate complex waveform
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dphi=twopi*(f0+itone(j)*baud)*dt
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do i=1,NSPS
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k=k+1
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phi=mod(phi+dphi,twopi)
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if(k.ge.0 .and. k.lt.NMAX) c0(k)=cmplx(cos(phi),sin(phi))
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enddo
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enddo
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if(fspread.ne.0.0 .or. delay.ne.0.0) call watterson(c0,NMAX,fs,delay,fspread)
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c=c+sig*c0
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enddo
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ib=k
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wave=real(c)
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peak=maxval(abs(wave(ia:ib)))
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rms=sqrt(dot_product(wave(ia:ib),wave(ia:ib))/NWAVE)
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nslots=1
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if(width.gt.0.0) call filt8(f0,nslots,width,wave)
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if(snrdb.lt.90) then
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do i=1,NMAX !Add gaussian noise at specified SNR
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xnoise=gran()
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! wave(i)=wave(i) + xnoise
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! if(i.ge.ia .and. i.le.ib) write(30,3001) i,wave(i)/peak
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!3001 format(i8,f12.6)
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wave(i)=wave(i) + xnoise
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enddo
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endif
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fac=32767.0
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rms=100.0
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if(snrdb.ge.90.0) iwave(1:NMAX)=nint(fac*wave)
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if(snrdb.lt.90.0) iwave(1:NMAX)=nint(rms*wave)
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h=default_header(12000,NMAX)
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write(fname,1102) ifile
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1102 format('000000_',i6.6,'.wav')
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open(10,file=fname,status='unknown',access='stream')
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write(10) h,iwave !Save to *.wav file
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close(10)
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write(*,1110) ifile,xdt,f0,snrdb,fname
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1110 format(i4,f7.2,f8.2,f7.1,2x,a17)
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enddo
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999 end program ft8sim
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