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florance
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加入日期: Dec 2003
文章: 3,688
應該很明確的指出這是設計與材質問題,後續的驗證與品管也是個問題。
疑... 護衛隊今天休假喔...

加減看看,GOOGLE 翻譯後:

全球定位系統問題

華碩最近發布了一個更新,可解決 GPS鎖定的性能,但它只能確保通過 WiFi下載星歷表(用於計算衛星位置)和歷書(所有GPS衛星的詳細信息)數據,以確定您當前的位置進程加快。沒有網絡的協助下,這個數據會收到從衛星本身處於極低的傳輸速率(每秒50位,在理想的條件下)。此更新不從根本上解決了GPS接收問題,也不是可能的地址,在軟件 - 這是一個總理的設計限制。

GPS信號傳輸高頻無線電波(1.5GHz的大多數客戶端GPSes)從地球表面(∼20K公里)以上的高軌道衛星的數量。 GPS衛星廣播準確的時間,為自己和其他系統的衛星的軌道定位信息。然後在地面上的GPS接收機可以計算出接收機的位置,從四個可見衛星的最低使用數據。更多的衛星更精確的位置計算是可能的,但四是普遍的最低。

從衛星所需要的數據不是很大,但它非常緩慢,並通過射頻傳輸很大的距離。正如我們在前面的帖子中提到的,無線電波不通過導線,阻止他們的道路。雖然時尚,鋁合金外殼阻擋無線電波非常好。


引用:
作者carage
AT這篇文章說的...
http://www.anandtech.com/show/5285/...issue-explained
The GPS Issue

ASUS recently released an update that addresses GPS lock performance, however it only ensures that ephemeris (used to calculate satellite position) and almanac (details for all GPS satellites) data are downloaded over WiFi to speed up the process of determining your current position. Without network assistance, this data would have to be received from the satellites themselves at an extremely low transfer rate (50 bits per second in ideal conditions). This update does not fundamentally address the issue of GPS reception, nor is it possible to address that in software - it's a limitation of the Prime's design.

GPS signals are transmitted as high frequency radio waves (~1.5GHz for most client GPSes) from a number of orbital satellites high above the earth's surface (~20K km). GPS satellites broadcast accurate time and orbital positioning information for themselves and other satellites in the system. GPS receivers on the ground can then calculate the receiver's location using this data from a minimum of four visible satellites. More accurate location calculation is possible with more satellites but four is generally the minimum.

The data needed from the satellites isn't very large, but it's transmitted very slowly and via RF over a great distance. As we've mentioned in earlier posts, radio waves don't pass through conductors that block their path. Though stylish, aluminum enclosures are very good at blocking radio waves.
     
      
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舊 2012-01-08, 01:09 PM #91
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