本文選題：區(qū)域定軌 + 模糊度固定　； 參考：《武漢大學(xué)學(xué)報(bào)(信息科學(xué)版)》2016年02期

【摘要】：我國(guó)北斗衛(wèi)星導(dǎo)航系統(tǒng)難以實(shí)現(xiàn)境外全球布站,采用區(qū)域站觀測(cè)值是實(shí)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(duì)提高區(qū)域定軌精度的作用。采用陸態(tài)網(wǎng)GPS觀測(cè)數(shù)據(jù)進(jìn)行區(qū)域精密定軌仿真驗(yàn)證,首先論證了不同測(cè)站分布下,整網(wǎng)模糊度固定對(duì)區(qū)域定軌精度的效果,結(jié)果表明:相同測(cè)站條件下,固定解定軌精度比浮點(diǎn)解精度提高30%以上;僅采用國(guó)內(nèi)7個(gè)站的固定解三維定軌精度即達(dá)到20cm左右,優(yōu)于27站的浮點(diǎn)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(cè)時(shí)長(zhǎng)對(duì)定軌精度影響,實(shí)測(cè)數(shù)據(jù)論證表明:當(dāng)中國(guó)區(qū)域站觀測(cè)時(shí)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(cè)弧段三維定軌精度均可達(dá)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(xué)衛(wèi)星導(dǎo)航定位中心;
【基金】：國(guó)家自然科學(xué)基金(41374034)~~
【分類號(hào)】：P228.4

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