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