Re: Radar Jamming

"Andy" <andysharpe@xxxxxxxx> wrote in
news:1113669980.202450.75090@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:

>
> Jim Yanik wrote:
>> "Andy" <andysharpe@xxxxxxxx> wrote in
>> news:1113598761.215699.286490@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:
>>
>>
>>
>> >
>> > Come to think of it, can anyone suggest where I can get a schematic
> of
>> > a LASAR gun so I can
>> > see how it works ?
>> >
>> > Andy (retired from Texas Instruments)
>> >
>>
>> Laser speed guns work by making multiple distance/time
> measurements,using
>> pulse widths of ~35ns,rep rates of ~500 hz.They fire a pulse,and
> clock the
>> return to measure distance.Then calculate the distance change over
> time.
>>
>> I got that a long time ago from an industry laser magazine;Laser
> World or
>> something like that.
>>
>> --
>> Jim Yanik
>> jyanik
>> at
>> kua.net
>
>
> Andy replies:
>
> Well then, I doubt that my blue sky idea would work for LASARs
> then...
> Oh well.
>
> I suspect that the beam is wide enough when it meets the car to
> illuminate the whole front, so they will get enough return from
> somewhere or other.....
>


Actually beam width is around 18 inches. Too big a spot,and your
measurement area may unknowingly strike more than one car,thus raising
doubt of which car was actually measured.



--
Jim Yanik
jyanik
at
kua.net
.

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