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Create a separate simulation program, ft8sim2, for New Style 77 bit messages. Hashes are not handled yet. Needs more testing.

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This commit is contained in:
Steve Franke 2018-07-04 09:52:39 -05:00
parent 24f4792b23
commit 91388f8ba2
3 changed files with 139 additions and 5 deletions
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4
CMakeLists.txt
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@ -466,6 +466,7 @@ set (wsjt_FSRCS
lib/ft8/ft8code.f90
lib/ft8/ft8_downsample.f90
lib/ft8/ft8sim.f90
lib/ft8/ft8sim2.f90
lib/gen4.f90
lib/gen65.f90
lib/gen9.f90
@ -1277,6 +1278,9 @@ target_link_libraries (ft8code wsjt_fort wsjt_cxx)
add_executable (ft8sim lib/ft8/ft8sim.f90 wsjtx.rc)
target_link_libraries (ft8sim wsjt_fort wsjt_cxx)
add_executable (ft8sim2 lib/ft8/ft8sim2.f90 wsjtx.rc)
target_link_libraries (ft8sim2 wsjt_fort wsjt_cxx)
add_executable (wsprlfsim lib/fsk4hf/wsprlfsim.f90 wsjtx.rc)
target_link_libraries (wsprlfsim wsjt_fort wsjt_cxx)

10
lib/ft8/ft8sim.f90
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@ -22,11 +22,11 @@ program ft8sim
! Get command-line argument(s)
nargs=iargc()
if(nargs.ne.9) then
print*,'Usage: ft8sim "message" nsig|f0 DT fdop del width nfiles snr type'
print*,'Examples: ft8sim "K1ABC W9XYZ EN37" 1500.0 0.0 0.1 1.0 0 10 -18 1'
print*,' ft8sim "K1ABC W9XYZ EN37" 10 0.0 0.1 1.0 25 10 -18 1'
print*,' ft8sim "K1ABC W9XYZ EN37" 25 0.0 0.1 1.0 25 10 -18 1'
print*,' ft8sim "K1ABC RR73; W9XYZ <KH1/KH7Z> -11" 300 0 0 0 25 1 -10 1'
print*,'Usage: ft8sim "message" nsig|f0 DT fdop del width nfiles snr'
print*,'Examples: ft8sim "K1ABC W9XYZ EN37" 1500.0 0.0 0.1 1.0 0 10 -18'
print*,' ft8sim "K1ABC W9XYZ EN37" 10 0.0 0.1 1.0 25 10 -18'
print*,' ft8sim "K1ABC W9XYZ EN37" 25 0.0 0.1 1.0 25 10 -18'
print*,' ft8sim "K1ABC RR73; W9XYZ <KH1/KH7Z> -11" 300 0 0 0 25 1 -10'
print*,'Make nfiles negative to invoke 72-bit contest mode.'
go to 999
endif

130
lib/ft8/ft8sim2.f90 Normal file
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@ -0,0 +1,130 @@
program ft8sim2
! Generate simulated "type 2" ft8 files
! Output is saved to a *.wav file.
use wavhdr
include 'ft8_params.f90' !Set various constants
parameter (NWAVE=NN*NSPS)
type(hdr) h !Header for .wav file
character arg*12,fname*17
character msg37*37,msgsent37*37,msg40*40
character c77*77
character*6 mygrid6
logical bcontest
complex c0(0:NMAX-1)
complex c(0:NMAX-1)
real wave(NMAX)
integer itone(NN)
integer*1 msgbits(77)
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" nsig|f0 DT fdop del width nfiles snr'
print*,'Examples: ft8sim "K1ABC W9XYZ EN37" 1500.0 0.0 0.1 1.0 0 10 -18'
print*,' ft8sim "K1ABC W9XYZ EN37" 10 0.0 0.1 1.0 25 10 -18'
print*,' ft8sim "K1ABC W9XYZ EN37" 25 0.0 0.1 1.0 25 10 -18'
print*,' ft8sim "K1ABC RR73; W9XYZ <KH1/KH7Z> -11" 300 0 0 0 25 1 -10'
print*,'Make nfiles negative to invoke 72-bit contest mode.'
go to 999
endif
call getarg(1,msg37) !Message to be transmitted
call getarg(2,arg)
read(arg,*) f0 !Frequency (only used for single-signal)
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,*) width !Filter transition width (Hz)
call getarg(7,arg)
read(arg,*) nfiles !Number of files
call getarg(8,arg)
read(arg,*) snrdb !SNR_2500
nsig=1
if(f0.lt.100.0) then
nsig=f0
f0=1500
endif
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
! Source-encode, then get itone()
call pack77(msg37,i3,n3,c77)
call unpack77(c77,msgsent37)
call genft8_174_91(msg37,mygrid6,bcontest,i3,n3,msgsent37,msgbits,itone)
write(*,1000) f0,xdt,txt,snrdb,bw,msgsent37
1000 format('f0:',f9.3,' DT:',f6.2,' TxT:',f6.1,' SNR:',f6.1, &
' BW:',f4.1,2x,a37)
write(*,'(a23,a37,i1,a1,i1)') 'New Style FT8 Message: ',msgsent37,i3,'.',n3
write(*,'(a14)') 'Message bits: '
write(*,'(77i1)') msgbits
write(*,'(a17)') 'Channel symbols: '
write(*,'(79i1)') itone
call sgran()
msg0=msg
do ifile=1,nfiles
k=nint((xdt+0.5)/dt)
ia=k
phi=0.0
do j=1,NN !Generate complex waveform
dphi=twopi*(f0*dt+itone(j)/real(NSPS))
do i=1,NSPS
if(k.ge.0 .and. k.lt.NMAX) c0(k)=cmplx(cos(phi),sin(phi))
k=k+1
phi=mod(phi+dphi,twopi)
enddo
enddo
if(fspread.ne.0.0 .or. delay.ne.0.0) call watterson(c0,NMAX,fs,delay,fspread)
c=c+sig*c0
enddo
ib=k
wave=real(c)
peak=maxval(abs(wave(ia:ib)))
rms=sqrt(dot_product(wave(ia:ib),wave(ia:ib))/NWAVE)
nslots=1
if(width.gt.0.0) call filt8(f0,nslots,width,wave)
if(snrdb.lt.90) then
do i=1,NMAX !Add gaussian noise at specified SNR
xnoise=gran()
wave(i)=wave(i) + xnoise
enddo
endif
fac=32767.0
rms=100.0
if(snrdb.ge.90.0) iwave(1:NMAX)=nint(fac*wave)
if(snrdb.lt.90.0) iwave(1:NMAX)=nint(rms*wave)
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)
999 end program ft8sim2