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求助:几个概念的解释或者定义
<P>差分GPS（DGPS）、自主差分GPS、信标差分GPS、卫星差分GPS</P><P>这几个概念的具体定义或者解释.谢谢</P>
2005-03-08 22:28
来自版块 -
全球定位系统 (GPS)
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![](<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>404 Not Found</title>
</head><body>
<h1>Not Found</h1>
<p>The requested URL /windid/index.php was not found on this server.</p>
<p>Additionally, a 404 Not Found
error was encountered while trying to use an ErrorDocument to handle the request.</p>
<hr>
<address>Apache/2.0.63 (Win32) PHP/5.2.14 Server at www.gisempire.com Port 80</address>
</body></html>/avatar/000/02/71/27125.jpg)