零基线约束的参考站间模糊度固定方法研究

论文提出一种GNSS零基线约束的参考站间模糊度快速固定方法,该方法基于“一天线+双接收机”设计进行参考站间模糊度固定。首先,利用两个参考站四台接收机观测值形成四对参考站间无电离层组合双差观测值。其次,结合无电离层组合观测值模糊度和宽巷整周模糊度进行卡尔曼滤波和N1模糊度实数解计算。然后在模糊度域内进行线性变换,单历元固定零基线模糊度;利用零基线模糊度约束解算四组参考站间模糊度中的一组模糊度。最后,利用固定的模糊度还原所有原始双差整周模糊度。实验证明:与传统参考站间模糊度固定方法比,充分利用了零基线模糊度固定的约束条件进行参考站间模糊度固定,加快了模糊度收敛速度,极大地提高了模糊度固定的速度和成功率。 

Research on Ambiguity Fixing Method of Reference Station with Zero Baseline Constraint

In this paper, a method for fast ambiguity resolution between reference stations with GNSS zero baseline constraints is proposed. The method is based on the design of "one antenna+two receivers". First of all, using the observations of four receivers on two reference stations, the double difference observation of the ionosphere free combination between four reference stations is constructed. Secondly, combined with the ionosphere ambiguity and the ambiguity of the whole lane, the real solution of N1 ambiguity is obtained by Kalman filter. Then, the linear transformation in the ambiguity domain, single epoch fixed zero baseline ambiguity; the relationship between the use of constraints of zero baseline ambiguity, calculated in the four groups a set of reference station ambiguity. Finally, all the original double difference ambiguities are solved by using the fixed ambiguity. Experiments show that compared with the traditional reference station, the ambiguity fixing method, make full use of the constraint of zero baseline ambiguity, accelerate the ambiguity speed, greatly improve the ambiguity speed and success rate.