mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-26 22:28:41 -05:00
132 lines
2.7 KiB
Fortran
132 lines
2.7 KiB
Fortran
|
program JTMSKsim
|
||
|
|
|
||
|
|
use wavhdr
|
||
|
|
parameter (NSPM=1404)
|
||
|
|
parameter (NFFT=256*1024)
|
||
|
|
parameter (NMAX=15*12000)
|
||
|
|
type(hdr) h
|
||
|
|
complex cb11(0:NSPM-1)
|
||
|
|
complex cmsg(0:NSPM-1)
|
||
|
|
complex c(0:NFFT-1)
|
||
|
|
complex c1(0:NSPM-1)
|
||
|
|
complex c2(0:NSPM-1)
|
||
|
|
integer i4tone(NSPM)
|
||
|
|
integer*2 iwave(NMAX)
|
||
|
|
real w(0:255)
|
||
|
|
character*8 arg
|
||
|
|
|
||
|
|
nargs=iargc()
|
||
|
|
if(nargs.ne.2) then
|
||
|
|
print*,'Usage: JTMSK freq dB'
|
||
|
|
go to 999
|
||
|
|
endif
|
||
|
|
call getarg(1,arg)
|
||
|
|
read(arg,*) fmid
|
||
|
|
call getarg(2,arg)
|
||
|
|
read(arg,*) snrdb
|
||
|
|
|
||
|
|
open(10,file='JTMSKcode.out',status='old')
|
||
|
|
do j=1,234
|
||
|
|
read(10,*) junk,i4tone(j)
|
||
|
|
enddo
|
||
|
|
close(10)
|
||
|
|
|
||
|
|
npts=NMAX
|
||
|
|
h=default_header(12000,npts)
|
||
|
|
twopi=8.0*atan(1.0)
|
||
|
|
dt=1.0/12000.0
|
||
|
|
df=12000.0/NFFT
|
||
|
|
k=-1
|
||
|
|
phi=0.
|
||
|
|
phi0=0.
|
||
|
|
sig=10.0**(0.05*snrdb)
|
||
|
|
|
||
|
|
! Generate the Tx waveform
|
||
|
|
cb11=0.
|
||
|
|
do j=1,234
|
||
|
|
dphi=twopi*(fmid-500.0)*dt
|
||
|
|
if(i4tone(j).eq.1) dphi=twopi*(fmid+500.0)*dt
|
||
|
|
dphi0=twopi*1000.0*dt
|
||
|
|
if(i4tone(j).eq.1) dphi0=twopi*2000.0*dt
|
||
|
|
do i=1,6
|
||
|
|
k=k+1
|
||
|
|
phi=phi+dphi
|
||
|
|
if(phi.gt.twopi) phi=phi-twopi
|
||
|
|
cmsg(k)=cmplx(cos(phi),sin(phi))
|
||
|
|
phi0=phi0+dphi0
|
||
|
|
if(phi0.gt.twopi) phi0=phi0-twopi
|
||
|
|
! if((k.ge.1 .and. k.le.66) .or. (k.ge.283 .and. k.le.348) .or. &
|
||
|
|
! (k.ge.769 .and.k.le.834)) cb11(k)=cmplx(cos(phi0),sin(phi0))
|
||
|
|
if(k.ge.1 .and. k.le.66) cb11(k)=cmplx(cos(phi0),sin(phi0))
|
||
|
|
! write(11,3001) k*dt,cmsg(k),phi
|
||
|
|
!3001 format(4f12.6)
|
||
|
|
enddo
|
||
|
|
enddo
|
||
|
|
|
||
|
|
! Generate noise with B=2500 Hz, rms=1.0
|
||
|
|
c=0.
|
||
|
|
ia=nint(250.0/df)
|
||
|
|
ib=nint(2759.0/df)
|
||
|
|
do i=ia,ib
|
||
|
|
x=gran()
|
||
|
|
y=gran()
|
||
|
|
c(i)=cmplx(x,y)
|
||
|
|
enddo
|
||
|
|
call four2a(c,NFFT,1,1,1)
|
||
|
|
sq=0.
|
||
|
|
do i=0,npts-1
|
||
|
|
sq=sq + real(c(i))**2 + aimag(c(i))**2
|
||
|
|
enddo
|
||
|
|
rms=sqrt(0.5*sq/npts)
|
||
|
|
c=c/rms
|
||
|
|
|
||
|
|
i0=3*12000
|
||
|
|
ncopy=NSPM
|
||
|
|
! ncopy=0.5*NSPM
|
||
|
|
c(i0:i0+ncopy-1)=c(i0:i0+ncopy-1) + sig*cmsg(0:ncopy-1)
|
||
|
|
do i=1,npts
|
||
|
|
iwave(i)=100.0*real(c(i))
|
||
|
|
enddo
|
||
|
|
|
||
|
|
open(12,file='150901_000000.wav',status='unknown',access='stream')
|
||
|
|
write(12) h,iwave(1:npts)
|
||
|
|
|
||
|
|
smax=0.
|
||
|
|
fpk=0.
|
||
|
|
jpk=0
|
||
|
|
nfft1=256
|
||
|
|
w=0.
|
||
|
|
do i=0,65
|
||
|
|
w(i)=sin(i*twopi/132.0)
|
||
|
|
enddo
|
||
|
|
|
||
|
|
do ia=0,npts-nfft1
|
||
|
|
c1(0:nfft1-1)=c(ia:ia+nfft1-1)*conjg(cb11(0:nfft1-1))
|
||
|
|
c2(0:nfft1-1)=w(0:nfft1-1)*c1(0:nfft1-1)
|
||
|
|
call four2a(c2,nfft1,1,-1,1)
|
||
|
|
do i=0,nfft1-1
|
||
|
|
! write(21,1100) i,c1(i)
|
||
|
|
!1100 format(i6,2f12.3)
|
||
|
|
enddo
|
||
|
|
|
||
|
|
df1=12000.0/nfft1
|
||
|
|
do i=-20,20
|
||
|
|
j=i
|
||
|
|
if(i.lt.0) j=j+nfft1
|
||
|
|
f=j*df1
|
||
|
|
if(i.lt.0) f=f-12000.0
|
||
|
|
s=1.e-3*(real(c2(j))**2 + aimag(c2(j))**2)
|
||
|
|
if(abs(ia-i0).lt.1404) write(22,1110) f,c2(j),s,ia
|
||
|
|
1110 format(4f12.3,i6)
|
||
|
|
if(s.gt.smax) then
|
||
|
|
smax=s
|
||
|
|
jpk=ia
|
||
|
|
fpk=f
|
||
|
|
endif
|
||
|
|
enddo
|
||
|
|
enddo
|
||
|
|
print*,smax,jpk*dt,fpk
|
||
|
|
|
||
|
|
999 end program JTMSKsim
|
||
|
|
|