100 lines
2.5 KiB
Plaintext
100 lines
2.5 KiB
Plaintext
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program msk144sim
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use wavhdr
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parameter (NMAX=15*12000)
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real pings(0:NMAX-1)
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real waveform(0:NMAX-1)
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character*6 mygrid
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character arg*8,msg*22,msgsent*22,fname*40
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real wave(0:NMAX-1) !Simulated received waveform
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real*8 twopi,freq,phi,dphi0,dphi1,dphi
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type(hdr) h !Header for .wav file
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integer*2 iwave(0:NMAX-1)
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integer itone(144) !Message bits
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logical*1 bcontest
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data mygrid/"EN50wc"/
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nargs=iargc()
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if(nargs.ne.6) then
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print*,'Usage: msk144sim message freq width nslow snr nfiles'
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print*,'Example: msk144sim "K1ABC W9XYZ EN37" 1500 0.12 1 2 1'
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print*,' msk144sim "K1ABC W9XYZ EN37" 1500 2.5 32 15 1'
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go to 999
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endif
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call getarg(1,msg)
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call getarg(2,arg)
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read(arg,*) freq
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call getarg(3,arg)
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read(arg,*) width
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call getarg(4,arg)
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read(arg,*) nslow
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call getarg(5,arg)
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read(arg,*) snrdb
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call getarg(6,arg)
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read(arg,*) nfiles
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!sig is the peak amplitude of the ping.
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sig=sqrt(2.0)*10.0**(0.05*snrdb)
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h=default_header(12000,NMAX)
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i1=len(trim(msg))-5
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bcontest=.false.
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if(msg(i1:i1+1).eq.'R ') bcontest=.true.
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ichk=0
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call genmsk144(msg,mygrid,ichk,bcontest,msgsent,itone,itype)
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twopi=8.d0*atan(1.d0)
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nsym=144
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nsps=6*nslow
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if( itone(41) .lt. 0 ) nsym=40
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baud=2000.d0/nslow
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dphi0=twopi*(freq-0.25d0*baud)/12000.d0
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dphi1=twopi*(freq+0.25d0*baud)/12000.d0
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phi=0.0
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k=0
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nreps=NMAX/(nsym*nsps)
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print*,nsym,nslow,nsps,baud,freq
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do jrep=1,nreps
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do i=1,nsym
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if( itone(i) .eq. 0 ) then
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dphi=dphi0
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else
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dphi=dphi1
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endif
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do j=1,nsps
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waveform(k)=cos(phi)
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k=k+1
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phi=mod(phi+dphi,twopi)
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enddo
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enddo
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enddo
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if(itype.lt.1 .or. itype.gt.7) then
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print*,'Illegal message'
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go to 999
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endif
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if(nslow.eq.1) call makepings(pings,NMAX,width,sig)
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! call sgran()
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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_',i6.6)
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open(10,file=fname(1:13)//'.wav',access='stream',status='unknown')
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wave=0.0
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iwave=0
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fac=sqrt(6000.0/2500.0)
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do i=0,NMAX-1
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xx=gran()
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if(nslow.eq.1) wave(i)=pings(i)*waveform(i) + fac*xx
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if(nslow.gt.1) wave(i)=sig*waveform(i) + fac*xx
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iwave(i)=30.0*wave(i)
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enddo
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write(10) h,iwave !Save the .wav file
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close(10)
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enddo
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999 end program msk144sim
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