Article View: sci.electronics
Article #19677Re: To build a cheap RF location tracker?
From: Rich Moran
Date: Thu, 08 Sep 1988 23:58
Date: Thu, 08 Sep 1988 23:58
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In article <804@ns.UUCP> logajan@ns.UUCP (John Logajan x3118) writes: >Joseph Weinstein writes: >> I have an need for a position tracking device, for an >> area no bigger than 1/4 mile x 1/4 mile. > >Personally I would go with ultrasonic pulses -- and use the >arrival time difference at several sites to compute location. > Since the speed of sound varies with temperature, humidity and movement within the medium (wind), the ultrasonic method can have some problems. The temp and humidity problems can be nulled by having a reference distance which is measured along with the targets, but wind is a toughie.
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arc1-ca.pugleaf.net!utzoo!attcan!uunet!lll-winken!lll-tis!ames!ncar!tank!oddjob!uwvax!rutgers!mit-eddie!uw-beaver!tikal!amc!richmReferences:
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!lll-winken!lll-tis!ames!ncar!tank!oddjob!uwvax!rutgers!mit-eddie!uw-beaver!tikal!amc!richm From: richm@amc.UUCP (Rich Moran) Newsgroups: sci.electronics Subject: Re: To build a cheap RF location tracker? Message-ID: <753@amc.UUCP> Date: 8 Sep 88 23:58:27 GMT References: <831@sybase.sybase.com> <804@ns.UUCP> Reply-To: richm@amc.UUCP (Rich Moran) Organization: Applied Microsystems Corp., Redmond, WA. Lines: 13