基于BDS/GPS组合定位的部分模糊度固定效果分析

多系统组合有利于提高卫星导航定位的精度及可靠性，然而对于载波差分定位由于模糊度维数的陡增、观测噪声、大气残余误差等原因用传统的Lambda方法很难得到所有模糊度的固定解，采用部分模糊度方法固定最优的模糊度子集则相对容易。总结了现有的部分模糊度固定方法，分析了不同方法的特点，并用实测数据分析了BDS/GPS组合动态定位时部分模糊度固定的效果。实验结果表明，部分模糊度方法可以显著提高模糊度固定时的成功率及Ratio值，并且可以缩短RTK定位时的初始化时间，加快坐标的收敛速度，提高组合系统动态定位结果的精度。

Performance Assessment of Partial Ambiguity Resolution Based on BDS/GPS Combined Positioning

Multi-GNSS combination is helpful to improve the accuracy and relibality of satellite navigation and positioning. However, in case of BDS/GPS combined carrier phase positioning systems, it is difficult to fix all the ambiguities due to the increasing number of ambiguities, high measurement noises or residual atmosphere delays with the traditional Lambda method. But it is of greater probability to fix a subset of ambiguities. In this paper, we divided current partial ambiguity fixing methods into three categories and analyzed the characteristics of every method. Finally, the effect of the three partial resolution methods were tested with the measured BDS/GPS data. The results show that the success rate and ratio value is obviously improved when using partial ambiguity fixing, at the same time, the initialization time of RTK is shortened, the precision of kinematic positioning is also improved.