發(fā)布時間：2018-06-16 17:32

  本文選題：區(qū)域定軌 + 模糊度固定　； 參考：《武漢大學學報(信息科學版)》2016年02期

【摘要】：我國北斗衛(wèi)星導航系統(tǒng)難以實現(xiàn)境外全球布站,采用區(qū)域站觀測值是實現(xiàn)高精度定軌的主要手段。本文分析了整網(wǎng)模糊度固定、有效定軌弧段選擇對提高區(qū)域定軌精度的作用。采用陸態(tài)網(wǎng)GPS觀測數(shù)據(jù)進行區(qū)域精密定軌仿真驗證,首先論證了不同測站分布下,整網(wǎng)模糊度固定對區(qū)域定軌精度的效果,結(jié)果表明:相同測站條件下,固定解定軌精度比浮點解精度提高30%以上;僅采用國內(nèi)7個站的固定解三維定軌精度即達到20cm左右,優(yōu)于27站的浮點解精度。另外,從星座的構(gòu)型與地面站分布的可視范圍方面,分析了不同觀測時長對定軌精度影響,實測數(shù)據(jù)論證表明:當中國區(qū)域站觀測時間大于48h,總能獲取不小于24h的區(qū)域有效定軌弧段,并且各衛(wèi)星最佳的24h觀測弧段三維定軌精度均可達到0.3m左右。
[Abstract]:It is difficult for China's Beidou satellite navigation system to achieve the global distribution of foreign stations, and the use of regional station observations is the main means to achieve high precision orbit determination. In this paper, the effect of fixed ambiguity of the whole network and the selection of effective orbit determination arc on improving the precision of orbit determination in the region is analyzed. The regional precision orbit determination is verified by GPS observation data of land network. Firstly, the effect of fixed ambiguity of the whole network on the precision of orbit determination is demonstrated under different station distribution. The results show that: under the same station conditions, The precision of fixed solution is more than 30% higher than that of floating-point solution, and the precision of three-dimension orbit determination by using only 7 stations in China is about 20cm, which is better than that of floating-point solution of 27 stations. In addition, from the configuration of constellation and the visible range of earth station distribution, the influence of different observation time on orbit determination accuracy is analyzed. The experimental data show that when the observation time of the Chinese regional station is more than 48 hours, the effective orbit determination can always be obtained in the region not less than 24 hours, and the best 3D orbit determination accuracy of the 24 hours observation arc segment of each satellite can reach about 0.3 m.
【作者單位】： 武漢大學衛(wèi)星導航定位中心;
【基金】：國家自然科學基金(41374034)~~
【分類號】：P228.4

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本文編號：2027542