mirror of https://github.com/saitohirga/WSJT-X.git
127 lines
4.2 KiB
Fortran
127 lines
4.2 KiB
Fortran
program ft8sim
|
|
|
|
! Generate simulated data for a 15-second HF/6m mode using 8-FSK.
|
|
! Output is saved to a *.wav file.
|
|
|
|
use wavhdr
|
|
include 'ft8_params.f90' !Set various constants
|
|
type(hdr) h !Header for .wav file
|
|
character arg*12,fname*17,sorm*1
|
|
character msg*22,msgsent*22
|
|
character*6 mygrid6
|
|
logical bcontest
|
|
complex c0(0:NMAX-1)
|
|
complex c(0:NMAX-1)
|
|
integer itone(NN)
|
|
integer*1 msgbits(KK)
|
|
integer*2 iwave(NMAX) !Generated full-length waveform
|
|
data mygrid6/'EM48 '/
|
|
|
|
! Get command-line argument(s)
|
|
nargs=iargc()
|
|
if(nargs.ne.8) then
|
|
print*,'Usage: ft8sim "message" s|m f0 DT fdop del nfiles snr'
|
|
print*,'Example: ft8sim "K1ABC W9XYZ EN37" m 1500.0 0.0 0.1 1.0 10 -18'
|
|
print*,'s|m: "s" for single signal at 1500 Hz, "m" for 25 signals'
|
|
print*,'f0 is ignored when sorm = m'
|
|
print*,'Make nfiles negative to invoke 72-bit contest mode.'
|
|
go to 999
|
|
endif
|
|
call getarg(1,msg) !Message to be transmitted
|
|
call getarg(2,sorm) !s for single signal, m for multiple sigs
|
|
if(sorm.eq."s") then
|
|
print*,"Generating single signal at 1500 Hz."
|
|
nsig=1
|
|
elseif( sorm.eq."m") then
|
|
print*,"Generating 25 signals per file."
|
|
nsig=25
|
|
else
|
|
print*,"sorm parameter must be s (single) or m (multiple)."
|
|
goto 999
|
|
endif
|
|
call getarg(3,arg)
|
|
read(arg,*) f0 !Frequency (only used for single-signal)
|
|
call getarg(4,arg)
|
|
read(arg,*) xdt !Time offset from nominal (s)
|
|
call getarg(5,arg)
|
|
read(arg,*) fspread !Watterson frequency spread (Hz)
|
|
call getarg(6,arg)
|
|
read(arg,*) delay !Watterson delay (ms)
|
|
call getarg(7,arg)
|
|
read(arg,*) nfiles !Number of files
|
|
call getarg(8,arg)
|
|
read(arg,*) snrdb !SNR_2500
|
|
|
|
bcontest=nfiles.lt.0
|
|
nfiles=abs(nfiles)
|
|
twopi=8.0*atan(1.0)
|
|
fs=12000.0 !Sample rate (Hz)
|
|
dt=1.0/fs !Sample interval (s)
|
|
tt=NSPS*dt !Duration of symbols (s)
|
|
baud=1.0/tt !Keying rate (baud)
|
|
bw=8*baud !Occupied bandwidth (Hz)
|
|
txt=NZ*dt !Transmission length (s)
|
|
bandwidth_ratio=2500.0/(fs/2.0)
|
|
sig=sqrt(2*bandwidth_ratio) * 10.0**(0.05*snrdb)
|
|
if(snrdb.gt.90.0) sig=1.0
|
|
txt=NN*NSPS/12000.0
|
|
i3bit=0 ! ### TEMPORARY ??? ###
|
|
|
|
! Source-encode, then get itone()
|
|
call genft8(msg,mygrid6,bcontest,i3bit,msgsent,msgbits,itone)
|
|
write(*,1000) f0,xdt,txt,snrdb,bw,msgsent
|
|
1000 format('f0:',f9.3,' DT:',f6.2,' TxT:',f6.1,' SNR:',f6.1, &
|
|
' BW:',f4.1,2x,a22)
|
|
|
|
write(*,'(28i1,1x,28i1)') msgbits(1:56)
|
|
write(*,'(16i1)') msgbits(57:72)
|
|
write(*,'(3i1)') msgbits(73:75)
|
|
write(*,'(12i1)') msgbits(76:87)
|
|
|
|
! call sgran()
|
|
do ifile=1,nfiles
|
|
c=0.
|
|
do isig=1,nsig
|
|
c0=0.
|
|
if(nsig.eq.25) then
|
|
f0=(isig+2)*100.0
|
|
endif
|
|
k=-1 + nint((xdt+0.5+0.01*gran())/dt)
|
|
! k=-1 + nint((xdt+0.5)/dt)
|
|
phi=0.0
|
|
do j=1,NN !Generate complex waveform
|
|
dphi=twopi*(f0+itone(j)*baud)*dt
|
|
do i=1,NSPS
|
|
k=k+1
|
|
phi=mod(phi+dphi,twopi)
|
|
if(k.ge.0 .and. k.lt.NMAX) c0(k)=cmplx(cos(phi),sin(phi))
|
|
enddo
|
|
enddo
|
|
if(fspread.ne.0.0 .or. delay.ne.0.0) call watterson(c0,NMAX,fs,delay,fspread)
|
|
c=c+sig*c0
|
|
enddo
|
|
if(snrdb.lt.90) then
|
|
do i=0,NMAX-1 !Add gaussian noise at specified SNR
|
|
xnoise=gran()
|
|
ynoise=gran()
|
|
c(i)=c(i) + cmplx(xnoise,ynoise)
|
|
enddo
|
|
endif
|
|
|
|
fac=32767.0
|
|
rms=100.0
|
|
if(snrdb.ge.90.0) iwave(1:NMAX)=nint(fac*real(c))
|
|
if(snrdb.lt.90.0) iwave(1:NMAX)=nint(rms*real(c))
|
|
|
|
h=default_header(12000,NMAX)
|
|
write(fname,1102) ifile
|
|
1102 format('000000_',i6.6,'.wav')
|
|
open(10,file=fname,status='unknown',access='stream')
|
|
write(10) h,iwave !Save to *.wav file
|
|
close(10)
|
|
write(*,1110) ifile,xdt,f0,snrdb,fname
|
|
1110 format(i4,f7.2,f8.2,f7.1,2x,a17)
|
|
enddo
|
|
|
|
999 end program ft8sim
|