Re: measuring distance between two cars using infrared circuits

From: Anthony Fremont (spam_at_anywhere.com)
Date: 01/24/05 

Date: Mon, 24 Jan 2005 04:12:22 GMT

"keith" <krw@att.bizzzz> wrote

> > I disagree. In the grand scheme of a signal that's usually taking
tens
> > of mS to make its journey, a few uS of turnaround overhead is not,
IMO,
> > significant nor does it have to be an unknown.
>
> We're talking abotu cars a few tens of feet apart. Thus it's
nanoseconds,
> and *any* turn-around in the transponder is *significant*.

Mac originally wrote:

>>> Ultrasound might work well. You could have a transponder on the back
>>> of the car in front and a range-finder on the front of the car in
>>> back.

This portion of the thread is about using ultrasound transponders, not
radar or IR. Sound doesn't get very far in a nS.

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