2021-04-09 08:57:41 -04:00
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program synctst
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! Tests JT65B2 sync patterns
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parameter (LAGMAX=20)
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real ccf0(0:LAGMAX),ccf2(0:LAGMAX),ccf3(0:LAGMAX)
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character*12 arg
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integer npr(126),np0(126),np1(126),npr2(126)
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data npr/1,0,0,1,1,0,0,0,1,1,1,1,1,1,0,1,0,1,0,0, &
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0,1,0,1,1,0,0,1,0,0,0,1,1,1,0,0,1,1,1,1, &
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0,1,1,0,1,1,1,1,0,0,0,1,1,0,1,0,1,0,1,1, &
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0,0,1,1,0,1,0,1,0,1,0,0,1,0,0,0,0,0,0,1, &
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1,0,0,0,0,0,0,0,1,1,0,1,0,0,1,0,1,1,0,1, &
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0,1,0,1,0,0,1,1,0,0,1,0,0,1,0,0,0,0,1,1, &
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1,1,1,1,1,1/
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nargs=iargc()
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if(nargs.ne.1) then
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print*,'Usage: synctst iters'
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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,*) iters
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worst=0.
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do lag=0,LAGMAX
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nsum=0
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do i=1,126-lag
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nsum=nsum + npr(i)*npr(lag+i)
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enddo
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ccf0(lag)=2.0*nsum/(126.0-lag)
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if(lag.ge.1 .and. ccf0(lag).gt.worst) worst=ccf0(lag)
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enddo
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best2=1.0
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do iter=1,iters
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10 np0=0
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np1=0
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n0=0
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do i=1,126
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if(npr(i).eq.1) then
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call random_number(r)
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if(r.lt.0.5) then
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np0(i)=1
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n0=n0+1
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else
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np1(i)=1
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endif
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endif
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enddo
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if(n0.ne.31 .and. n0.ne.32) go to 10
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worst2=0.
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do lag=0,LAGMAX
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nsum=0
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do i=1,126-lag
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nsum=nsum + np0(i)*np0(lag+i) + np1(i)*np1(lag+i)
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enddo
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ccf2(lag)=2.0*nsum/(126.0-lag)
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if(lag.ge.1 .and. ccf2(lag).gt.worst2) then
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worst2=ccf2(lag)
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lagbad=lag
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endif
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enddo
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if(worst2.lt.best2) then
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best2=worst2
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lagbest=lagbad
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n0best=n0
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ccf3=ccf2
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npr2=np0 + 2*np1
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endif
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enddo
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do lag=0,LAGMAX
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write(13,1100) lag,ccf0(lag),ccf3(lag)
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1100 format(i3,2f10.3)
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enddo
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print*,worst,best2,n0best,lagbest
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write(*,1110) npr2
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1110 format((8x,20(i1,',')))
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999 end program synctst
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