program wsprcpmsim ! Generate simulated data for a 2-minute "WSPR-LF" mode. Output is saved ! to a *.c2 or *.wav file. use wavhdr include 'wsprcpm_params.f90' !Set various constants parameter (NMAX=120*12000) type(hdr) hwav !Header for .wav file character arg*12,fname*16 character msg*22,msgsent*22 complex c0(0:NMAX/NDOWN-1) complex c(0:NMAX/NDOWN-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.9) then print*,'Usage: wsprcpmsim "message" f0 DT fsp del nwav nfiles snr h' print*,'Example: wsprcpmsim "K1ABC FN42 30" 50 1.0 0.1 1.0 1 10 -32 1.0' 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 *.c2 file call getarg(7,arg) read(arg,*) nfiles !Number of files call getarg(8,arg) read(arg,*) snrdb !SNR_2500 call getarg(9,arg) read(arg,*) h !h twopi=8.0*atan(1.0) fs=12000.0/NDOWN ! dt=1.0/fs !Sample interval (s) tt=NSPS*dt !Duration of "itone" 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 genwsprcpm(msg,msgsent,itone) !Encode the message, get itone write(*,1000) f0,xdt,txt,snrdb,fspread,delay,nfiles,msgsent 1000 format('f0:',f9.3,' DT:',f6.2,' txt:',f6.1,' SNR:',f6.1, & ' fspread:',f6.1,' delay:',f6.1,' nfiles:',i3,2x,a22) c0=0. k=-1 + nint(xdt/dt) do j=1,NN write(*,*) j,itone(j) dp=twopi*(f0+itone(j)*(h/2.0)*baud)*dt do i=1,NSPS k=k+1 phi=mod(phi+dp,twopi) if(k.ge.0 .and. k.lt.NMAX/NDOWN) c0(k)=cmplx(cos(phi),sin(phi)) enddo enddo call sgran() do ifile=1,nfiles c=c0 if(nwav.eq.0) then if( fspread .ne. 0.0 .or. delay .ne. 0.0 ) then ntot=NMAX/NDOWN nsig=NN*NSPS call watterson(c,ntot,nsig,fs,delay,fspread) endif c=c*sig if(snrdb.lt.90) then do i=0,NMAX/NDOWN-1 !Add gaussian noise at specified SNR xnoise=gran() ynoise=gran() c(i)=c(i) + cmplx(xnoise,ynoise) enddo endif write(fname,1100) ifile 1100 format('000000_',i4.4,'.c2') open(10,file=fname,status='unknown',access='stream') fMHz=10.1387d0 nmin=2 write(10) fname,nmin,fMHz,c !Save to *.c2 file close(10) else call wsprcpm_wav(baud,xdt,h,f0,itone,snrdb,iwave) hwav=default_header(12000,NMAX) write(fname,1102) ifile 1102 format('000000_',i4.4,'.wav') open(10,file=fname,status='unknown',access='stream') write(10) hwav,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 wsprcpmsim