本文關(guān)鍵詞： BDS TCAR RTK 模糊度解算 幾何無關(guān)組合 電離層無關(guān)組合　出處：《武漢大學學報(信息科學版)》2017年12期 　論文類型：期刊論文

【摘要】：基于幾何無關(guān)(geometry-free,GF)和電離層無關(guān)(ionosphere-free,IF)的三頻原始載波線性組合觀測量,由于消除了一階電離層延遲項以及同衛(wèi)星與測站間幾何距離相關(guān)誤差項的影響,可有效應(yīng)用于中長基線模糊度解算。對適用于北斗衛(wèi)星導航系統(tǒng)(BDS)中長基線模糊度解算的GF和IF線性組合觀測量進行了研究和優(yōu)化,通過對載波觀測量與偽距觀測量組合,得到噪聲最小且基于GF和IF的寬巷組合觀測量,然后將模糊度得到固定的兩個載波組合觀測量與原始載波觀測量進行最優(yōu)線性組合,得到具有最低噪聲的基于GF和IF的窄巷組合觀測量。該方法充分利用了所有載波及偽距觀測量信息,并根據(jù)其噪聲水平進行了加權(quán)優(yōu)化,公式推導具有普遍性和代表性。通過三頻實測基線數(shù)據(jù)進行了論證分析。結(jié)果表明,經(jīng)過一段時間的平滑之后,寬巷和窄巷模糊度浮點解的偏差能收斂到0.5周以內(nèi),從而實現(xiàn)模糊度的快速準確固定。
[Abstract]:The linear combination of three frequency carrier based on geometric free free GF( GF) and ionospheric ionosphere-free ionization (IFF) can eliminate the influence of the first order ionospheric delay term and the geometric distance related error term between the same satellite and the observation station, the first order ionospheric delay term and the geometric distance between the same satellite and the station are eliminated. It can be used to calculate the ambiguity of medium and long baseline effectively. The GF and if linear combined observations, which are suitable for the calculation of ambiguity of medium and long baseline in Beidou Satellite Navigation system (BDS), are studied and optimized. The carrier observations and pseudo-range observations are combined. The minimum noise and the combination of GF and if are obtained. Then the ambiguity of the two carrier combination observations with the original carrier observations is optimized and linearly combined. The combined observation of narrow lane based on GF and if with the lowest noise is obtained. The method makes full use of all carrier and pseudo-range observation information, and makes weighted optimization according to its noise level. The formula derivation is universal and representative. It is proved and analyzed by the measured baseline data of three frequencies. The results show that after a period of smoothing, the deviation of the floating point solution of ambiguity in wide and narrow lanes can converge to less than 0.5 weeks. Thus the ambiguity is fixed quickly and accurately.
【作者單位】： 信息工程大學導航與空天目標工程學院;
【分類號】：TN967.1

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