57 lines
1.1 KiB
Fortran
57 lines
1.1 KiB
Fortran
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program t6
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parameter (MAXFFT=1404)
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complex c(0:MAXFFT-1)
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real s(0:MAXFFT-1)
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m1=45
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m2=67
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m3=89
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nsym=3*11 + m1 + m2 + m3
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nfft=6*nsym
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nh=nfft/2
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best=9999.
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! do m1=22,67
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! do m2=37,97
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do m1=30,67
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do m2=26,100
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m3=201-m2-m1
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if(m3.lt.13) cycle
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c=0.
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n1=6*(11+m1)
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n2=n1+6*(11+m2)
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c(1:66)=1.
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c(1+n1:66+n1)=1.
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c(1+n2:66+n2)=1.
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call four2a(c,nfft,1,-1,1) !c2c FFT
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df=12000.0/nfft
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smax=0.
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do i=0,nfft-1
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s(i)=real(c(i))**2 + aimag(c(i))**2
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if(i.ne.0) smax=max(s(i),smax)
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enddo
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sidelobe=db(smax/s(0))
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if(sidelobe.lt.best) then
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write(*,1000) m1,m2,m3,sidelobe
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1000 format(3i5,f8.2)
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best=sidelobe
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s=s/s(0)
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rewind 13
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do j=0,nfft-1
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i=mod(j+nh,nfft)
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f=i*df
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if(i.gt.nh) f=f-12000.0
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write(13,1020) f,s(i)
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1020 format(2f12.4)
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enddo
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endif
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enddo
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enddo
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end program t6
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