program wspr5sim ! Generate simulated data for a 5-minute "WSPR-LF" mode. Output is saved ! to a *.c5 or *.wav file. use wavhdr include 'wsprlf_params.f90' !Set various constants parameter (NMAX=300*12000) type(hdr) h !Header for .wav file character arg*12,fname*16 character msg*22,msgsent*22 complex c0(0:NZ-1) complex c(0:NZ-1) real*8 fMHz integer itone(NN) integer*2 iwave(NMAX) !Generated full-length waveform ! Get command-line argument(s) nargs=iargc() if(nargs.ne.8) then print*,'Usage: wspr5sim "message" f0 DT fsp del nwav nfiles snr' print*,'Example: wspr5sim "K1ABC FN42 30" 50 0.0 0.1 1.0 1 10 -33' go to 999 endif call getarg(1,msg) !Message to be transmitted call getarg(2,arg) read(arg,*) f0 !Freq relative to WSPR-band center (Hz) call getarg(3,arg) read(arg,*) xdt !Time offset from nominal (s) call getarg(4,arg) read(arg,*) fspread !Watterson frequency spread (Hz) call getarg(5,arg) read(arg,*) delay !Watterson delay (ms) call getarg(6,arg) read(arg,*) nwav !1 for *.wav file, 0 for *.c5 file call getarg(7,arg) read(arg,*) nfiles !Number of files call getarg(8,arg) read(arg,*) snrdb !SNR_2500 twopi=8.0*atan(1.0) fs=12000.0/NDOWN !Sample rate dt=1.0/fs !Sample interval (s) tt=NSPS*dt !Duration of "itone" symbols (s) ts=2*NSPS*dt !Duration of OQPSK symbols (s) baud=1.0/tt !Keying rate for "itone" symbols (baud) txt=NZ*dt !Transmission length (s) bandwidth_ratio=2500.0/(fs/2.0) sig=sqrt(bandwidth_ratio) * 10.0**(0.05*snrdb) if(snrdb.gt.90.0) sig=1.0 txt=NN*NSPS0/12000.0 call genwspr5(msg,msgsent,itone) !Encode the message, get itone write(*,1000) f0,xdt,txt,snrdb,nfiles,msgsent 1000 format('f0:',f9.3,' DT:',f6.2,' txt:',f6.1,' SNR:',f6.1, & ' nfiles:',i3,2x,a22) dphi0=twopi*(f0-0.25*baud)*dt dphi1=twopi*(f0+0.25*baud)*dt phi=0.0 c0=0. k=-1 + nint(xdt/dt) do j=1,NN !Generate OQPSK waveform from itone dphi=dphi0 if(itone(j).eq.1) dphi=dphi1 if(k.eq.0) phi=-dphi do i=1,NSPS k=k+1 phi=phi+dphi if(phi.gt.twopi) phi=phi-twopi xphi=phi if(k.ge.0 .and. k.lt.NZ) c0(k)=cmplx(cos(xphi),sin(xphi)) enddo enddo if( fspread .ne. 0.0 .or. delay .ne. 0.0 ) then call watterson(c0,NZ,fs,delay,fspread) endif c0=sig*c0 !Scale to requested sig level do ifile=1,nfiles if(nwav.eq.0) then if(snrdb.lt.90) then do i=0,NZ-1 !Add gaussian noise at specified SNR xnoise=gran() ynoise=gran() c(i)=c0(i) + cmplx(xnoise,ynoise) enddo endif write(fname,1100) ifile 1100 format('000000_',i4.4,'.c5') open(10,file=fname,status='unknown',access='stream') fMHz=10.1387d0 nmin=5 write(10) fname,nmin,fMHz,c !Save to *.c5 file close(10) else call wspr5_wav(baud,xdt,f0,itone,snrdb,iwave) h=default_header(12000,NMAX) write(fname,1102) ifile 1102 format('000000_',i4.4,'.wav') open(10,file=fname,status='unknown',access='stream') write(10) h,iwave !Save to *.wav file close(10) endif write(*,1110) ifile,xdt,f0,snrdb,fname 1110 format(i4,f7.2,f8.2,f7.1,2x,a16) enddo 999 end program wspr5sim