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ft8sim.f90 can now generate 25 independently-fading signals.

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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7869 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke 2017-07-13 22:23:59 +00:00
parent c71b72c824
commit 2e704a33db
1 changed files with 36 additions and 22 deletions
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58
lib/fsk4hf/ft8sim.f90
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@ -6,7 +6,7 @@ program ft8sim
use wavhdr
include 'ft8_params.f90' !Set various constants
type(hdr) h !Header for .wav file
character arg*12,fname*17
character arg*12,fname*17,sorm*1
character msg*22,msgsent*22
complex c0(0:NMAX-1)
complex c(0:NMAX-1)
@ -16,21 +16,36 @@ program ft8sim
! Get command-line argument(s)
nargs=iargc()
if(nargs.ne.6) then
print*,'Usage: ft8sim "message" DT fdop del nfiles snr'
print*,'Example: ft8sim "K1ABC W9XYZ EN37" 0.0 0.1 1.0 10 -18'
if(nargs.ne.8) then
print*,'Usage: ft8sim "message" sorm f0 DT fdop del nfiles snr'
print*,'Example: ft8sim "K1ABC W9XYZ EN37" m 1500.0 0.0 0.1 1.0 10 -18'
print*,'sorm: "s" for single signal at 1500 Hz, "m" for 25 signals'
print*,'f0 is ignored when sorm = m'
go to 999
endif
call getarg(1,msg) !Message to be transmitted
call getarg(2,arg)
read(arg,*) xdt !Time offset from nominal (s)
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,*) fspread !Watterson frequency spread (Hz)
read(arg,*) f0 !Frequency (only used for single-signal)
call getarg(4,arg)
read(arg,*) delay !Watterson delay (ms)
read(arg,*) xdt !Time offset from nominal (s)
call getarg(5,arg)
read(arg,*) nfiles !Number of files
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
twopi=8.0*atan(1.0)
@ -56,28 +71,27 @@ write(*,'(3i1)') msgbits(73:75)
write(*,'(12i1)') msgbits(76:87)
! call sgran()
c=0.
do ifile=1,nfiles
c0=0.
do isig=1,25
f0=(isig+2)*100.0
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
k=-1 + nint(xdt+0.5/dt)
do j=1,NN !Generate complex waveform
dphi=twopi*(f0+itone(j)*baud)*dt
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.NMAX) c0(k)=cmplx(cos(xphi),sin(xphi))
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(c,NMAX,fs,delay,fspread)
c=c+c0
if(fspread.ne.0.0 .or. delay.ne.0.0) call watterson(c0,NMAX,fs,delay,fspread)
c=c+sig*c0
enddo
c=c*sig
if(snrdb.lt.90) then
do i=0,NMAX-1 !Add gaussian noise at specified SNR
xnoise=gran()