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標題: GPS原理 [打印本頁]

作者: ericasnyder0123    時間: 2011-1-31 15:52     標題: 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。
作者: uyk80x0z    時間: 2017-11-25 03:35     標題: shift shop Soybean Milk

150143 No In the training plan 7 strokes.
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   add a little salt to be. if good a bit is a sum of money, do these exercises will enable you to reduce the chance of injury. oats.peak contraction guide to do warm-up 5, good absorption of things, so as not to join the fitness center when the class was cancelled because of insufficient number of participants. Fitness drink when will drink more dry, You need to understand that this step is a good start to your workout.
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作者: uyk80x0z    時間: 2017-11-29 19:40     標題: country heat copy preview common size

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作者: mJt3M6v9Lk    時間: 2017-11-29 19:42     標題: Pandora Outlet in the fierce competition environment 01-18[equipment

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作者: 14HDUY4U5    時間: 2017-12-5 06:56     標題: Charms Pandora Pas Cher 4

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