摘要
针对三频载波模糊度解算TCAR法因电离层、观测噪声等误差影响而导致长基线模糊度解算可靠性较低的问题,提出了一种改进的适用于长基线网络RTK的TCAR方法。该方法继承了传统TCAR法逐级固定整周模糊度的思想,充分根据模糊度解算中每一步骤不同特点及不同目的选择最优组合观测值。首先,利用组合限制条件确定超宽巷模糊度解算最优组合;然后,引入平滑思想提高电离层残差估计精度,同时结合求解窄巷模糊度的WL/NL最优组合快速获得窄巷模糊度;最后,通过线性无关宽巷与窄巷组合模糊度实现基础载波模糊度准确解算。算例分析表明,基于最优组合的改进TCAR法有效提高了模糊度解算的成功率,实现了长基线网络RTK三频载波模糊度的快速解算。
In view that three-frequency carrier ambiguity resolution（TCAR） method has low reliability in long baseline ambiguity resolution due to the errors of ionosphere,observation noise,etc.,an improved TCAR method for long-range network RTK is proposed.With relying on integer bootstrapping,this method takes into account different features and purposes in every step in order to choose the best combination.First,the optimal combinations for the extra-wide-lane ambiguity resolution are selected under the combination constraints.Then an idea which is similar to carrier-smoothed code is introduced to improve the estimate accuracy of ionospheric errors.Also with the optimal combinations,the narrow-lane ambiguity is solved.At last,through the linear independence combinations of wide-lane and narrow-lane,the basic carrier ambiguity is accurately resolved.Experiment shows that this method can improve the success rate of ambiguity and realize the fast resolution for the three-frequency ambiguity of long-range network RTK.
出处
《中国惯性技术学报》
EI
CSCD
北大核心
2012年第5期587-592,共6页
Journal of Chinese Inertial Technology
基金
国家自然科学基金(41204032)
关键词
三频载波
模糊度解算
网络RTK
最优组合
长基线
three-frequency carrier
ambiguity resolution
network RTK
optimal combinations
long baseline
