Performance Assessment of Partial Ambiguity Resolution Based on BDS/GPS Combined Positioning
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摘要: 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。Abstract: 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.
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Keywords:
- partial ambiguity resolution /
- BDS/GPS /
- success rate /
- RTK /
- Lambda
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图 3 3种部分模糊度与FULL方法基线解算精度比较
Figure 3. Contrast of Three Partial Ambiguities Resolution Methods with "FULL" Method about the Precision of Baseline Solution
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图 4 4种模糊度固定方法解算的坐标误差结果
Figure 4. Performance of Four Ambiguity > Resolution Methods for "Baseline 2"
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图 5 滤波过程中模糊度成功固定的个数
Figure 5. The Number of Successfully Fixed Ambiguities for "Baseline 2"
表 1 四种方法在不同的Ratio阈值下的固定率/%
Table 1 The Proportion of Successfully Fixed Epochs Under Different Ratio Threshold/%
Ratio阈值 FULL FS WN SRC 3.0 32.9 63.8 61.8 41.4 2.0 50.4 99.8 69.0 67.2 动态阈值 69.1 99.9 69.2 100 
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表 2 4种解算方法的初始化时间及坐标误差结果
Table 2 The Initialization Time and Baseline Solution Error of Four Methods
模糊度固定方法 FULL FS WN SRC 初始化时间/s 910 20 500 640 N/m 0.040 0.012 0.014 0.030 E/m 0.063 0.016 0.016 0.036 U/m 0.111 0.030 0.042 0.082
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