110 lines
3.7 KiB
Fortran
110 lines
3.7 KiB
Fortran
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.8) then
|
|
print*,'Usage: wsprmsksim "message" f0 DT fsp del nwav nfiles snr'
|
|
print*,'Example: wsprmsksim "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 *.c2 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 !
|
|
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)
|
|
|
|
h=1.00
|
|
c0=0.
|
|
k=-1 + nint(xdt/dt)
|
|
do j=1,NN
|
|
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
|
|
call watterson(c,NMAX/NDOWN,fs,delay,fspread)
|
|
endif
|
|
!do i=0,NMAX/NDOWN-1
|
|
!write(23,*) i,real(c(i)),imag(c(i))
|
|
!enddo
|
|
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)
|
|
!do i=0,NMAX/NDOWN-1
|
|
!write(57,*) i,real(c(i)),imag(c(i))
|
|
!enddo
|
|
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
|