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<html> <head> <title>RFID-Bulletin Board: Re: Where can I get introduction for POSITIONING using RFID., Roshini at 12/05/2000 09:51</title> <!-- Anfang Header --><!-- Ende Header --> </head> <BODY BGCOLOR="#fffcf4"><!-- Anfang BeitragsseitenKopf --><!-- Ende BeitragsseitenKopf --><!-- AnfangBanner --><!-- EndeBanner --><blockquote> <center> <h1>Re: Where can I get introduction for POSITIONING using RFID.</h1> </center><!-- Anfang BeitragsNavigationsLeisteOben --><!-- AnfangLinie --><center><p><HR></p></center><!-- EndeLinie --><center><P><B>[ <a href="../index.htm">RFID-Bulletin Board</a> ]</B></P></center><!-- AnfangLinie --><center><p><HR></p></center><!-- EndeLinie --><!-- Ende BeitragsNavigationsLeisteOben --><p>Written by <a href="mailto:roshini999@yahoo.com">Roshini</a> at 05 Dec 2000 09:51:32:<p>As an answer to: <a href="196.htm">Where can I get introduction for POSITIONING using RFID.</a> written by Janson Wang at 18 Oct 2000 17:50:43:<p>I think I can give a brief overview on positioning using RFID. The range of the tags used for positioning should be large and they need to generate codes at a baseband rate of 10 MHz or better (presumably modulated onto a 915-MHz or 2.4-GHz carrier).The setup would be something like this-the tags are attached to valuable assets or personnel badges.The tags change the signal's frequency and transpond it back to the reader with tag ID information phase-modulated onto it. The reader extracts the tag ID from this return signal, and also determines the tag's distance from the antenna by measuring the round trip time of flight. Since the distance to each reader is determined independently, there is no need to synchronize the clocks on the various readers. The cell controller quickly cycles among antennas, determining distances to whichever of them are in range of the tag. Once this is done for at least three antennas, the tag's location in space can be estimated. In many situations, a good estimate of tag location can be obtained from fewer than three antennas. <p>I found a similar solution in www.solveit.com. There are other solutions mapped on the site using RFID which would help u in clearly understanding the concepts. Also search for the related products mapped on the site. I hope this info helps u. <br><br><!-- AnfangLinie --><center><p><HR></p></center><!-- EndeLinie --><form method=POST action="http://f16.parsimony.net/forum26490/wwwforum.cgi?formular"><input type=hidden name="followup" value="196,233"><input type=hidden name="origname" value="Roshini"><input type=hidden name="origemail" value="roshini999@yahoo.com"><input type=hidden name="origsubject" value="Re: Where can I get introduction for POSITIONING using RFID."><input type=hidden name="origdate" value="05 Dec 2000 09:51:32"><input type=hidden name="subject" value="Re: Where can I get introduction for POSITIONING using RFID."><input type=hidden name="body" value=">I think I can give a brief overview on positioning using RFID. The range of the tags used for positioning should be large and they need to generate codes at a baseband rate of 10 MHz or better (presumably modulated onto a 915-MHz or 2.4-GHz carrier).The setup would be something like this-the tags are attached to valuable assets or personnel badges.The tags change the signal's frequency and transpond it back to the reader with tag ID information phase-modulated onto it. The reader extracts the tag ID from this return signal, and also determines the tag's distance from the antenna by measuring the round trip time of flight. Since the distance to each reader is determined independently, there is no need to synchronize the clocks on the various readers. The cell controller quickly cycles among antennas, determining distances to whichever of them are in range of the tag. Once this is done for at least three antennas, the tag's location in space can be estimated. In many situations, a good estimate of tag location can be obtained from fewer than three antennas. >I found a similar solution in www.solveit.com. There are other solutions mapped on the site using RFID which would help u in clearly understanding the concepts. Also search for the related products mapped on the site. I hope this info helps u. "><input type="submit" name="abschicken" value="Write an answer"> <br><!-- AnfangLinie --><center><p><HR></p></center><!-- EndeLinie --><p><a name="followups"><B>List of answers:</B></a><br><ul><!--insert: 233--></ul><!--end: 233--><!-- Anfang BeitragsNavigationsLeisteUnten --><!-- AnfangLinie --><center><p><HR></p></center><!-- EndeLinie --><center><P><B>[ <a href="../index.htm">RFID-Bulletin Board</a> ]</B></P></center><!-- AnfangLinie --><center><p><HR></p></center><!-- EndeLinie --><!-- Ende BeitragsNavigationsLeisteUnten --></blockquote><!-- Anfang BeitragsseitenFuss --><!-- Ende BeitragsseitenFuss --></body></html>⌨️ 快捷键说明
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