�?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#20122;&#27954;&#27431;&#27954;&#21160;&#28459;&#44;&#31934;&#21697;&#21306;&#19968;&#21306;&#20108;&#21306;&#44;&#30007;&#29983;&#22899;&#29983;&#24046;&#24046;&#24046;&#30340;&#35270;&#39057;&#22312;&#32447;&#35266;&#30475;</title><link>http://www.aygfsteel.com/skweld/archive/2005/11/01/17605.html</link><dc:creator>麓�</dc:creator><author>麓�</author><pubDate>Mon, 31 Oct 2005 16:59:00 GMT</pubDate><guid>http://www.aygfsteel.com/skweld/archive/2005/11/01/17605.html</guid><wfw:comment>http://www.aygfsteel.com/skweld/comments/17605.html</wfw:comment><comments>http://www.aygfsteel.com/skweld/archive/2005/11/01/17605.html#Feedback</comments><slash:comments>1</slash:comments><wfw:commentRss>http://www.aygfsteel.com/skweld/comments/commentRss/17605.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/skweld/services/trackbacks/17605.html</trackback:ping><description><![CDATA[
<p style="line-height: 13pt;"><span style="font-size: 10.5pt;" lang="EN-US">RFID</span><span style="font-size: 10.5pt;">是英�span lang="EN-US">“RADIO FREQUENCY IDENTIFICATION�/span>�
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密性。射频识别技术适用的领域：物料跟踪ã€�è¿�载工具和货架识别½{‰è¦�求é�žæŽ¥è§¦æ•°æ�®é‡‡é›†å’Œäº¤æ�¢çš„场å�ˆåQŒè¦�求频¾J�改å�˜æ•°æ�®å†…容的场å�ˆž®¤äؓ适用。如香港的èžR辆自åŠ?
识别¾pÈ�»Ÿ<span lang="EN-US">â€?/span>驾易通，采用的主è¦�技术就是射频技术。目å‰�香港已¾l�有¾U?span lang="EN-US">8</span>万辆汽èžR装上了电å­�æ ‡½{¾ï¼Œè£…有电å­�标签的èžR辆通过装有ž®„频扫æ��器的专用隧é�“ã€�å�œè½¦åœºæˆ–高速公路èµ\å�£æ—¶åQŒæ— éœ€å�œèžR¾~´è´¹åQŒå¤§å¤§æ��高了行èžR速度åQŒæ��高了效率。射频技术在其它物å“�的识别å�Šè‡ªåŠ¨åŒ–管ç�†æ–¹é�¢ä¹Ÿå¾—到了较òq¿æ³›çš„应用ã€?span lang="EN-US"> <br>
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</span><span style="font-size: 10.5pt; font-family: 宋体;">　　å�ªæœ‰å�¯è¯»å�¯å†™æ ‡ç­¾¾pÈ�»Ÿæ‰�需è¦�ç¼–½E‹å™¨ã€‚ç¼–½E‹å™¨æ˜¯å�‘标签写入数æ�®çš„装¾|®ã€‚ç¼–½E‹å™¨å†™å…¥æ•°æ�®ä¸€èˆ¬æ�¥è¯´æ˜¯¼›È�º¿åQ?/span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US">OFF-LINE</span><span style="font-size: 10.5pt; font-family: 宋体;">åQ‰å®Œæˆ�çš„åQŒä¹Ÿž®±æ˜¯é¢„先在标½{¾ä¸­å†™å…¥æ•°æ�®åQŒç­‰åˆ°å¼€å§‹åº”用时直接把标½{ùN»�附在被标识项目上。也有一äº?/span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US">RFID</span><span style="font-size: 10.5pt; font-family: 宋体;">应用¾pÈ�»ŸåQŒå†™æ•°æ�®æ˜¯åœ¨¾U¿ï¼ˆ</span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US">ON-LINE</span><span style="font-size: 10.5pt; font-family: 宋体;">åQ‰å®Œæˆ�çš„åQŒå°¤å…¶æ˜¯åœ¨ç”Ÿäº§çŽ¯å¢ƒä¸­ä½œäؓ交互å¼�便æ�ºæ•°æ�®æ–‡ä»¶æ�¥å¤„ç�†æ—¶ã€?/span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US"><br>
</span><span style="font-size: 10.5pt; font-family: 宋体;">　　</span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US">4</span><span style="font-size: 10.5pt; font-family: 宋体;">åQ?/span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;"> </span><span style="font-size: 10.5pt; font-family: 宋体;">天线</span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US"><br>
</span><span style="font-size: 10.5pt; font-family: 宋体;">　　天线是标½{¾ä¸Žé˜…读器之间传输数æ�®çš„å�‘å°„ã€�接收装¾|®ã€‚在实际应用中，除了¾pÈ�»ŸåŠŸçŽ‡åQŒå¤©¾U¿çš„形状和相对ä½�¾|®ä¹Ÿä¼šåª„å“�æ•°æ�®çš„å�‘射和接æ”Óž¼Œéœ€è¦�专业ä�h员对¾pÈ�»Ÿçš„天¾U¿è¿›è¡Œè®¾è®¡ã€�安装ã€?/span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US"><br>
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有é™�åQŒä»Žæ ‡ç­¾ä¸­å�‘出的无线信å�·æ˜¯é�žå¸¸å¼±çš„，信å�·ä¼ è¾“的速度与传输的è·�离ž®±å¾ˆæœ‰é™�。äؓ了实现数æ�®é«˜é€Ÿã€�è¿œè·�离åœîC¼ è¾“，必须把数æ�®ä¿¡å�·å� åŠ åœ¨ä¸€ä¸ªè§„则å�˜åŒ–çš„ä¿?
å�äh¯”较强的电波上åQŒè¿™ä¸ªè¿‡½E‹å�«è°ƒåˆ¶åQŒè§„则å�˜åŒ–的甉|‡Lå�«è�²æ³¢ã€‚在</span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US">RFID</span><span style="font-size: 10.5pt; font-family: 宋体;">¾pÈ�»Ÿä¸­ï¼Œè½½æ‡L甉|‡L一般由阅读器或¾~–程器å�‘出。有多ç§�æ–ÒŽ³•å�¯ä»¥å®žçŽ°æ•°æ�®åœ¨è�²æ³¢ä¸Šçš„è°ƒåˆÓž¼Œå¦‚用数æ�®ä¿¡æ�¯æ”¹å�˜è½½æ‡Lçš„æ‡Lòq…å�«è°ƒå¹…åQ›æ”¹å�˜è�²æ³¢çš„频率å�«è°ƒé¢‘；改å�˜è½½æ‡L的相ä½�å�«è°ƒç›¸½{‰ç­‰ã€‚一般æ�¥è¯ß_¼Œä½¿ç”¨çš„è�²æ³¢é¢‘率越高，数æ�®èƒ½å¤Ÿä¼ è¾“的速度­‘Šå¿«åQŒä¾‹å¦‚，</span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US">2.4GHZ</span><span style="font-size: 10.5pt; font-family: 宋体;">频率的è�²æ³¢ï¼Œå�¯ä»¥å®žçŽ°</span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US">2Mbps</span><span style="font-size: 10.5pt; font-family: 宋体;">åQˆç›¸å½“于æ¯�秒å�¯ä»¥ä¼ è¾“大约</span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US">200</span><span style="font-size: 10.5pt; font-family: 宋体;">万个字符åQ‰ã€‚但是，ä¸�能无é™�地æ��高è�²æ³¢é¢‘率以æ��高信æ�¯ä¼ è¾“速度åQŒå› ä¸ºï¼Œæ— çº¿ç”‰|‡L频率的选用是å�—到政府管制的åQŒå�„个国家一般都对ä¸�å�Œé¢‘率的无线甉|‡L规定了ä¸�å�Œçš„应用目的åQ?/span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US">RFID</span><span style="font-size: 10.5pt; font-family: 宋体;">技术无¾U¿ç”µæ³¢çš„选择也必™å»é�µå®ˆè¿™¿U�规定。目å‰�，国内一般采用通信频率ä¸?/span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US">2.4GHz</span><span style="font-size: 10.5pt; font-family: 宋体;">扩频技术进行通信。这是因为在我国</span><st1:chmetcnv unitname="g" sourcevalue="2.4" hasspace="False" negative="False" numbertype="1" tcsc="0" w:st="on"><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US">2.4G</span></st1:chmetcnv><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US">-2.4835GHz </span><span style="font-size: 10.5pt; font-family: 宋体;">çš?
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用宽带频率传输数æ�®æœ€æ˜Žæ˜¾çš„优势是数æ�®ä¼ è¾“的速度˜q›ä¸€æ­¥åŠ å¿«ï¼Œè€Œä¸”å�¯é� æ€§æ›´é«˜ï¼Œå› äؓ当一个频率的载æ‡L¾U¿èµ\¾J�忙或出现故障时åQŒä¿¡æ�¯å�¯ä»¥é€šè¿‡åˆ«çš„频率载æ‡L¾U¿èµ\
传输。实际商用宽带传输数æ�®æŠ€æœ¯å�ˆå�¯ä»¥åˆ†äؓ两ç§�åQšå�³ç›´æŽ¥åº�列扩频技术（</span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US">Direct Sequence<br>
</span><span style="font-size: 10.5pt; font-family: 宋体;">　　</span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US">Spread
Spectrum,</span><span style="font-size: 10.5pt; font-family: 宋体;">½Ž€¿U°ç›´é¢‘技术）和蟩频技术（</span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US">Frequency Hopping FH</span><span style="font-size: 10.5pt; font-family: 宋体;">åQ‰ã€?/span><span style="font-size: 10.5pt; font-family: &quot;Times New Roman&quot;;" lang="EN-US"><br>
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