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<p><span style="font-size:12pt;font-family:宋体;">相对于传统</span><span style="font-size:12pt;font-family:´Arial´,´sans-serif´;">GPS</span><span style="font-size:12pt;font-family:宋体;">解决方案而言，</span><span style="font-size:12pt;font-family:´Arial´,´sans-serif´;">A-GPS</span><span style="font-size:12pt;font-family:宋体;">（</span><span style="font-size:12pt;font-family:´Arial´,´sans-serif´;">Assisted GPS</span><span style="font-size:12pt;font-family:宋体;">）和手机整合之后显得实用性更强，</span><span style="font-size:12pt;font-family:´Arial´,´sans-serif´;">A-GPS</span><span style="font-size:12pt;font-family:宋体;">同样需要在手机内部内置</span><span style="font-size:12pt;font-family:´Arial´,´sans-serif´;">GPS</span><span style="font-size:12pt;font-family:宋体;">模块，并且对手机天线需要进行相应的改造。不过和传统</span><span style="font-size:12pt;font-family:´Arial´,´sans-serif´;">GPS</span><span style="font-size:12pt;font-family:宋体;">定位不同的是，手机作为</span><span style="font-size:12pt;font-family:´Arial´,´sans-serif´;">GPS</span><span style="font-size:12pt;font-family:宋体;">应用设备不需要进行位置信息数据计算，而是将</span><span style="font-size:12pt;font-family:´Arial´,´sans-serif´;">GPS</span><span style="font-size:12pt;font-family:宋体;">定位数据传输给移动网络，直接由网络定位服务器进行计算，同时移动网络按照</span><span style="font-size:12pt;font-family:´Arial´,´sans-serif´;">GPS</span><span style="font-size:12pt;font-family:宋体;">的参考网络所产生的辅助数据，如差分校正数据、卫星运行状态等传递给手机，并从数据库中查出手机的近似位置和小区所在的位置信息回传给手机，这样手机就能很快接受到所需要的</span><span style="font-size:12pt;font-family:´Arial´,´sans-serif´;">GPS</span><span style="font-size:12pt;font-family:宋体;">定位数据，这样就解决了我们经常遇到的</span><span style="font-size:12pt;font-family:´Arial´,´sans-serif´;">GPS</span><span style="font-size:12pt;font-family:宋体;">首次定位的时间过长问题，短短几秒钟时间我们就能得到所需要的</span><span style="font-size:12pt;font-family:´Arial´,´sans-serif´;">GPS</span><span style="font-size:12pt;font-family:宋体;">信号和定位信息。</span><span style="font-size:12pt;font-family:宋体;">简而言之，</span><span style="font-size:12pt;font-family:´Arial´,´sans-serif´;">A-GPS</span><span style="font-size:12pt;font-family:宋体;">就是利用移动基站提供的位置信息，帮助机身内置的</span><span style="font-size:12pt;font-family:´Arial´,´sans-serif´;">GPS</span><span style="font-size:12pt;font-family:宋体;">芯片的设备快速定位。</span></p> |
