mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2025-10-30 04:20:22 -04:00
51 lines
1.0 KiB
Fortran
51 lines
1.0 KiB
Fortran
|
program genmet
|
||
|
|
|
||
|
|
character*12 arg
|
||
|
|
integer hist(-128:128)
|
||
|
|
lim(x)=min(127,max(-128,nint(scale*x)))
|
||
|
|
|
||
|
|
nargs=iargc()
|
||
|
|
if(nargs.ne.4) then
|
||
|
|
print*,'Usage: genmet bw scale snr iters'
|
||
|
|
print*,'Example: genmet 1.46 20 -24 1000000'
|
||
|
|
go to 999
|
||
|
|
endif
|
||
|
|
call getarg(1,arg)
|
||
|
|
read(arg,*) bw
|
||
|
|
call getarg(2,arg)
|
||
|
|
read(arg,*) scale
|
||
|
|
call getarg(3,arg)
|
||
|
|
read(arg,*) snr
|
||
|
|
call getarg(4,arg)
|
||
|
|
read(arg,*) iters
|
||
|
|
|
||
|
|
hist=0
|
||
|
|
s=sqrt(2500.0/bw) * 10.0**(0.05*snr)
|
||
|
|
fac=1.0/sqrt(2.0)
|
||
|
|
do iter=1,iters
|
||
|
|
x1=fac*gran()
|
||
|
|
y1=fac*gran()
|
||
|
|
x0=fac*gran()
|
||
|
|
y0=fac*gran()
|
||
|
|
r=(x1+s)**2 + y1*y1 - x0*x0 - y0*y0
|
||
|
|
hist(lim(r))=hist(lim(r))+1
|
||
|
|
enddo
|
||
|
|
|
||
|
|
xln2=log(2.0)
|
||
|
|
do i=-128,127
|
||
|
|
p1=hist(i)/dfloat(iters)
|
||
|
|
j=-i
|
||
|
|
if(j.gt.127) j=127
|
||
|
|
p0=hist(j)/dfloat(iters)
|
||
|
|
xlhd0=log(max(0.001,2.0*p0/(p0+p1)))/xln2
|
||
|
|
xlhd1=log(max(0.001,2.0*p1/(p0+p1)))/xln2
|
||
|
|
write(13,1010) i/scale,hist(i)/dfloat(iters)
|
||
|
|
1010 format(f8.3,f12.9)
|
||
|
|
write(14,1012) i+128,xlhd0,xlhd1
|
||
|
|
1012 format(i4,2f8.3)
|
||
|
|
enddo
|
||
|
|
|
||
|
|
999 end program genmet
|
||
|
|
|
||
|
|
|