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Thread Subject:
Simple problem ...

Subject: Simple problem ...

From: Cris ToPh

Date: 6 Apr, 2010 20:28:22

Message: 1 of 3

Hi,

I need one of numerous experts around this forum.

it's a simple problem so if u can help me .. of give to me some references...

Assume a isotropic sensor emiting a time t=0 a frontwave. The radius of detection is R and celerity is c. So tmax = R/c is the time horizon of the problem.

Assume a target with a rectilign motion p(t) = p0 + ut where p0 is the initial position and u is the director vector ... (such that ||u|| << c)

My question is : find the time 0<t<tmax if exist where a beam intersect the target motion.....

Subject: Simple problem ...

From: Bruno Luong

Date: 6 Apr, 2010 20:47:20

Message: 2 of 3

"Cris ToPh" <sebydocky@hotmail.com> wrote in message <hpg5h5$jek$1@fred.mathworks.com>...
> Hi,
>
> I need one of numerous experts around this forum.
>
> it's a simple problem so if u can help me .. of give to me some references...
>
> Assume a isotropic sensor emiting a time t=0 a frontwave. The radius of detection is R and celerity is c. So tmax = R/c is the time horizon of the problem.
>
> Assume a target with a rectilign motion p(t) = p0 + ut where p0 is the initial position and u is the director vector ... (such that ||u|| << c)
>
> My question is : find the time 0<t<tmax if exist where a beam intersect the target motion.....

The way you formulate the problem shows that you completely ignore relativity effect. Are you sure it's a right formulation?

Bruno

Subject: Simple problem ...

From: Roger Stafford

Date: 6 Apr, 2010 20:49:21

Message: 3 of 3

"Cris ToPh" <sebydocky@hotmail.com> wrote in message <hpg5h5$jek$1@fred.mathworks.com>...
> Hi,
>
> I need one of numerous experts around this forum.
>
> it's a simple problem so if u can help me .. of give to me some references...
>
> Assume a isotropic sensor emiting a time t=0 a frontwave. The radius of detection is R and celerity is c. So tmax = R/c is the time horizon of the problem.
>
> Assume a target with a rectilign motion p(t) = p0 + ut where p0 is the initial position and u is the director vector ... (such that ||u|| << c)
>
> My question is : find the time 0<t<tmax if exist where a beam intersect the target motion.....

  I don't think I like the sound of that problem! What kind of target is it that you have in mind? Animal? Human? I'm certainly not going to help you with that one.

Roger Stafford

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