基于北斗三频约束的中长基线解算研究

利用北斗三频模糊度易固定的特点,提出一种具有北斗三频约束的BDS/GPS基础模糊度快速解算方法。针对中长基线,利用多历元平滑无电离层组合模糊度,从无电离层组合模糊度中分离出北斗基础模糊度;然后将北斗基础模糊度带入基线解算模型中,约束求解出GPS基础模糊度,最后将GPS与BDS基础模糊度回带观测方程,可实现基线的快速解算。经北斗实测数据验证表明,文中方法可快速固定GPS基础模糊度,较传统卡尔曼滤波求解模糊度方法,大大减少正确固定模糊度所需的原始观测历元数,实现基线的快速解算。

Research on medium-length baseline solution with Beidou three frequency constraint

This paper uses the triple frequency ambiguity easily fixed characteristics,and puts forward a constraint based with the triple frequency BDS/GPS rapid ambiguity resolution method.For mid-long baselines,firstly,multiple epochs smoothe non-ionosphere combined ambiguity,and then separats Beidou basic ambiguity from non-ionosphere combined ambiguity.Then the Beidou basic ambiguity as a priori knowledge is put into the baseline solution model.The constraint of GPS basic ambiguity is solved,and finally the GPS and BDS basic ambiguity back to the observation equation,in order to achieve a fast baseline solution. The experimental data from BeiDou verified that the method proposed in this paper can quickly fix the basic ambiguity of GPS and solve the ambiguity compared with the traditional Kalman filter. This method can greatly reduce the original observation epoch needed to correctly fix the ambiguity and achieve the baseline quick solution.