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Merge branch 'develop' of bitbucket.org:k1jt/wsjtx into develop

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Bill Somerville 2019-12-03 19:08:46 +00:00
commit 507739b668
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5 changed files with 47 additions and 132 deletions
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1
CMakeLists.txt
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@ -487,6 +487,7 @@ set (wsjt_FSRCS
lib/geodist.f90
lib/getlags.f90
lib/getmet4.f90
lib/ft8/get_spectrum_baseline.f90
lib/ft2/gfsk_pulse.f90
lib/graycode.f90
lib/graycode65.f90

1
lib/ft8/baseline.f90
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@ -37,6 +37,7 @@ subroutine baseline(s,nfa,nfb,sbase)
kz=k
a=0.
call polyfit(x,y,y,kz,nterms,0,a,chisqr) !Fit a low-order polynomial
sbase=0.0
do i=ia,ib
t=i-i0
sbase(i)=a(1)+t*(a(2)+t*(a(3)+t*(a(4)+t*(a(5))))) + 0.65

131
lib/ft8/ft8sim_gfsk.f90
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@ -1,131 +0,0 @@
program ft8sim_gfsk
! Generate simulated "type 2" ft8 files
! Output is saved to a *.wav file.
use wavhdr
use packjt77
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
character c77*77
complex c0(0:NMAX-1)
complex c(0:NMAX-1)
complex cwave(0:NWAVE-1)
real wave(NMAX)
real xjunk(NWAVE)
integer itone(NN)
integer*1 msgbits(77)
integer*2 iwave(NMAX) !Generated full-length waveform
! Get command-line argument(s)
nargs=iargc()
if(nargs.ne.7) then
print*,'Usage: ft8sim "message" f0 DT fdop del nfiles snr'
print*,'Examples: ft8sim "K1ABC W9XYZ EN37" 1500.0 0.0 0.1 1.0 10 -18'
print*,' ft8sim "WA9XYZ/R KA1ABC/R FN42" 1500.0 0.0 0.1 1.0 10 -18'
print*,' ft8sim "K1ABC RR73; W9XYZ <KH1/KH7Z> -11" 300 0 0 0 25 1 -10'
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,*) nfiles !Number of files
call getarg(7,arg)
read(arg,*) snrdb !SNR_2500
nsig=1
if(f0.lt.100.0) then
nsig=f0
f0=1500
endif
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)
bt=2.0
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()
i3=-1
n3=-1
call pack77(msg37,i3,n3,c77)
call genft8(msg37,i3,n3,msgsent37,msgbits,itone)
call gen_ft8wave(itone,NN,NSPS,bt,fs,f0,cwave,xjunk,1,NWAVE) !Generate complex cwave
write(*,*)
write(*,'(a23,a37,3x,a7,i1,a1,i1)') 'New Style FT8 Message: ',msgsent37,'i3.n3: ',i3,'.',n3
write(*,1000) f0,xdt,txt,snrdb,bw
1000 format('f0:',f9.3,' DT:',f6.2,' TxT:',f6.1,' SNR:',f6.1, &
' BW:',f4.1)
write(*,*)
if(i3.eq.1) then
write(*,*) ' mycall hiscall hisgrid'
write(*,'(28i1,1x,i1,1x,28i1,1x,i1,1x,i1,1x,15i1,1x,3i1)') msgbits(1:77)
else
write(*,'(a14)') 'Message bits: '
write(*,'(77i1)') msgbits
endif
write(*,*)
write(*,'(a17)') 'Channel symbols: '
write(*,'(79i1)') itone
write(*,*)
call sgran()
msg0=msg
do ifile=1,nfiles
c0=0.
c0(0:NWAVE-1)=cwave
c0=cshift(c0,-nint((xdt+0.5)/dt))
if(fspread.ne.0.0 .or. delay.ne.0.0) call watterson(c0,NMAX,NWAVE,fs,delay,fspread)
c=sig*c0
wave=imag(c)
peak=maxval(abs(wave))
nslots=1
if(snrdb.lt.90) then
do i=1,NMAX !Add gaussian noise at specified SNR
xnoise=gran()
wave(i)=wave(i) + xnoise
enddo
endif
gain=100.0
if(snrdb.lt.90.0) then
wave=gain*wave
else
datpk=maxval(abs(wave))
fac=32766.9/datpk
wave=fac*wave
endif
if(any(abs(wave).gt.32767.0)) print*,"Warning - data will be clipped."
iwave=nint(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)
enddo
999 end program ft8sim_gfsk

43
lib/ft8/get_spectrum_baseline.f90 Normal file
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@ -0,0 +1,43 @@
subroutine get_spectrum_baseline(dd,nfa,nfb,sbase)
include 'ft8_params.f90'
parameter(NST=NFFT1/2,NF=NMAX/NST-1)
real s(NH1,NF)
real savg(NH1)
real sbase(NH1)
real x(NFFT1)
real window(NFFT1)
complex cx(0:NH1)
real dd(NMAX)
equivalence (x,cx)
logical first
data first/.true./
save first,window
if(first) then
first=.false.
pi=4.0*atan(1.)
window=0.
call nuttal_window(window,NFFT1)
window=window/sum(window)*NSPS*2/300.0
endif
! Compute symbol spectra, stepping by NSTEP steps.
savg=0.
df=12000.0/NFFT1
do j=1,NF
ia=(j-1)*NST + 1
ib=ia+NFFT1-1
if(ib.gt.NMAX) exit
x=dd(ia:ib)*window
call four2a(x,NFFT1,1,-1,0) !r2c FFT
s(1:NH1,j)=abs(cx(1:NH1))**2
savg=savg + s(1:NH1,j) !Average spectrum
enddo
if(nfa.lt.nint(200.0)) nfa=nint(200.0)
if(nfb.gt.nint(4910.0)) nfb=nint(4910.0)
call baseline(savg,nfa,nfb,sbase)
return
end subroutine get_spectrum_baseline

3
lib/ft8/sync8.f90
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@ -37,7 +37,8 @@ subroutine sync8(dd,nfa,nfb,syncmin,nfqso,maxcand,s,candidate, &
enddo
savg=savg + s(1:NH1,j) !Average spectrum
enddo
call baseline(savg,nfa,nfb,sbase)
! call baseline(savg,nfa,nfb,sbase)
call get_spectrum_baseline(dd,nfa,nfb,sbase)
ia=max(1,nint(nfa/df))
ib=nint(nfb/df)