Newsgroups: comp.robotics
Path: brunix!sgiblab!sdd.hp.com!col.hp.com!csn!newncar!hsdndev!admii!ovation!usenet
From: rjd@pica.army.mil (Robert Dellicker  (QAF-I) <rjd>)
Subject: Re: Altitude sensors
Message-ID: <CJzxBK.FLJ@pica.army.mil>
Sender: usenet@pica.army.mil (USENET Special Account <usenet>)
Nntp-Posting-Host: ramcad2.pica.army.mil
Reply-To: rjd@pica.army.mil
Organization: US Army ARDEC
References: <2hh6g5INNpec@matt.ksu.ksu.edu>
Date: Fri, 21 Jan 1994 20:09:20 GMT
Lines: 28


>I would like to know if anyone has ever tried to do any kind of altitude
>sensing.  Is there a pressure sensor sensitive enough to detect a change
>in altitude of a foot or less?  The best method I could think of was to
>mount an ultrsonic sensor pointing downward and take a reading to determine
>the distance.  What is the best way to do implement this sonar array?  Is
>there any device out there that controls this easily?
>Any info would be greatly appreciated.
>
The standard altimeters used in private aircraft are presure sensing
devices.  They must be set to the barometric pressure or known altitude of
the airport prior to takeoff.  If landing at a controlled airfield the
current barometric pressure is normally given so that the altimeter can be
adjusted.  This is to prevent flying into the ground under low visibility
conditions.  In order to trust your instruments you need to know that they
are calibrated.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Bob Dellicker
rjd@pica.army.mil
 
Fire Control & Small Cal Systems Div.
Product Assurance & Test Dir.
US Army, Armaments Research, Development & Engineering Center
 
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