多频载波相位混合伪距组合解算模糊度研究

GPS Ambiguity Resolution Method Based on Multi-frequency Phase Carrier Combination Mixed with Pseudo-range Data

基于多频载波相位混合伪距组合原理,根据无几何消电离层的限制条件,以组合后噪声最小为目标提出了优选模型,搜索得到适用于GPS中长基线模糊度解算的典型组合;进而研究了利用电离层延迟平滑改进的多频模糊度解算方法,对GPS三频仿真中长基线数据进行了实验。结果表明,采用实时平滑电离层延迟,只需几min的数据便可以使双差电离层延迟影响削弱到cm级,而利用十几min的观测数据可以快速正确固定基础载波相位模糊度,具有一定的实用价值。

Based on the model of phase carrier combination mixed with pseudo-range,taking the minimal noise variance as the standard and the geometry-free and ionosphere-free property as the constrain condition,the searching model was proposed.Furthermore,the ionosphere delay smoothed triple-frequency ambiguity resolution method was investigated.And experiment was performed based on the simulated GPS triple-frequency double-differenced long baseline data.The result shows that the ionosphere delay can be degraded from decimeter level to centimeter even millimeter level only with several minutes data using the real time smoothed algorithm.Consequently,the ambiguity of basic frequency phase observation can be resolved within several minutes.