【摘要】：為研究衛(wèi)星截止高度角和GNSS系統(tǒng)組合對PPP精度的影響,對部分MGEX觀測站10d的實測數(shù)據(jù)分別進行24h的精密單點定位數(shù)據(jù)處理,分析了5°~55°不同截止高度角下單系統(tǒng)GPS、BDS、GLONASS、雙系統(tǒng)GPS/BDS、GPS/GLONASS、GLONASS/BDS、三系統(tǒng)GPS/BDS/GLONASS組合的可見衛(wèi)星數(shù)以及定位精度。在確定的系統(tǒng)組合情況下,對不同截止高度角的定位精度分析表明,單系統(tǒng)定位的截止高度角應(yīng)設(shè)置在30°以下,雙系統(tǒng)應(yīng)設(shè)置在40°以下,多系統(tǒng)應(yīng)設(shè)置在55°以下;所有組合方式的最優(yōu)截止高度角均在7°~15°;在確定的衛(wèi)星截止高度角情況下,對不同系統(tǒng)組合的定位精度分析表明,當(dāng)截止高度角小于40°時,定位精度最高的為GPS/BDS/GLONASS,最低的為BDS,其他系統(tǒng)組合居中;當(dāng)截止高度角小于25°時,系統(tǒng)組合對定位精度的影響較為明顯,隨著截止高度角的增大(從25°到40°時),這種影響逐漸減小,當(dāng)截止高度角進一步增大至40°時,主要依靠BDS衛(wèi)星定位,能夠進行定位的系統(tǒng)組合定位精度基本相當(dāng)。
[Abstract]:In order to study the effect of satellite cutoff altitude angle and GNSS system combination on PPP accuracy, the data of 10 days measured at some MGEX stations were processed with precise single point positioning data for 24 hours, and the GPS,BDS,GLONASS, system with 5 擄~ 55 擄different cut-off height angles was analyzed. The number of visible satellites and positioning accuracy of GPS/BDS/GLONASS combination of dual system GPS/BDS,GPS/GLONASS,GLONASS/BDS, three systems. In the case of determined system combination, the positioning accuracy of different cut-off height angles shows that the cutoff height angle of single system positioning should be below 30 擄, that of double system should be below 40 擄, and that of multi-system should be less than 55 擄. The optimal cut-off height angle of all combinations is 7 擄~ 15 擄; When the cut-off altitude angle of satellite is determined, the positioning accuracy of different system combinations is analyzed. The results show that when the cut-off altitude angle is less than 40 擄, the highest positioning accuracy is GPS/BDS/GLONASS, and the lowest one is BDS, other system combination. When the cut-off height angle is less than 25 擄, the effect of system combination on positioning accuracy is obvious. With the increase of cut-off height angle (from 25 擄to 40 擄), the effect decreases gradually, and when the cut-off height angle increases further to 40 擄, Mainly rely on BDS satellite positioning, the positioning system combination positioning accuracy is basically the same.
【作者單位】： 中國礦業(yè)大學(xué)環(huán)境與測繪學(xué)院;中國礦業(yè)大學(xué)江蘇省資源環(huán)境信息工程重點實驗室;
【基金】：國家自然科學(xué)基金(41674008,41604006) 高等學(xué)校博士學(xué)科點專項科研基金(20130095110022) 江蘇省普通高校研究生科研創(chuàng)新計劃項目(SJCX17_0522)~~
【分類號】：P228

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