WSJT-X/lib/fsk4hf/wsprsimf.f90

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Fortran
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!-------------------------------------------------------------------------------
!
! This file is part of the WSPR application, Weak Signal Propagation Reporter
!
!-------------------------------------------------------------------------------
program wsprsim
use wavhdr
include 'wspr_params.f90'
type(hdr) hwav
character arg*12,fname14*14,fname15*15
character*22 msg,msgsent
complex c0(0:NMAX/NDOWN-1)
complex c(0:NMAX/NDOWN-1)
integer itone(NN)
integer*2 iwave(NMAX)
real*8 fMHz
! Get command-line argument(s)
nargs=iargc()
if(nargs.ne.8) then
print*,'Usage: wsprsim "message" f0 DT fsp del nwav nfiles snr'
print*,'Example: wsprsim "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
tt=NSPS*dt
baud=12000.0/8192.0
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 genwspr(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)
! write(*,*) "Channel symbols: "
! write(*,'(162i2)') itone
h=1.0
phi=0.0
c0=0.
k=-1 + nint(xdt/dt)
do j=1,NN
dphi=-twopi*(f0+h*(itone(j)-1.5)*baud)*dt
do i=1,NSPS
k=k+1
phi=mod(phi+dphi,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
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(fname14,1100) ifile
1100 format('000000_',i4.4,'.c2')
open(10,file=fname14,status='unknown',access='stream')
fMHz=10.1387d0
nmin=2
write(10) fname14,nmin,fMHz,c !Save to *.c2 file
close(10)
write(*,1108) ifile,xdt,f0,snrdb,fname14
1108 format(i4,f7.2,f8.2,f7.1,2x,a14)
else
freq=1500.0+f0
call wspr_wav(baud,xdt,h,freq,itone,snrdb,iwave)
hwav=default_header(12000,NMAX)
write(fname15,1102) ifile
1102 format('000000_',i4.4,'.wav')
open(10,file=fname15,status='unknown',access='stream')
write(10) hwav,iwave !Save to *.wav file
close(10)
write(*,1110) ifile,xdt,f0,snrdb,fname15
1110 format(i4,f7.2,f8.2,f7.1,2x,a15)
endif
enddo
999 end program wsprsim