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测绘学报  2015 

SPODS软件GPS/GNSS网解的模糊度解算方法

DOI: 10.11947/j.AGCS.2015.20130461, PP. 128-134

Keywords: 全球GPS/GNSS网,模糊度解算,独立双差模糊度选取,SPODS软件

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Abstract:

为了尽可能多地固定模糊度,需要定义一组“最容易被固定”的独立双差模糊度,当前最优的方法(传统方法)是分基线层和网层对候选双差模糊度进行独立性检验,其中候选模糊度按照其综合固定成功概率进行排列。考虑到通常的网解中,测站数量远多于卫星数量,提出先星座层再网层的分层独立模糊度选取方法(新方法)以及基于更新协方差阵上三角平方根的序贯模糊度固定方法,并应用于西安测绘研究所自主设计和开发的SPODS软件中。包含64个IGS监测站的实测GPS数据进行的单天解算试验验证了新方法的正确性。试验结果表明新方法和传统方法得到的单天GPS轨道解与IGS最终综合轨道比较的1DRMS都约为0.012m,独立双差模糊度成功固定的比例约为92%,两种方法仅有非常细微的差异。不同测站数量的进一步试验表明,新方法和传统方法在网层需要采用Grams-Schmidt方法进行独立性检验的候选双差模糊度数量的比约等于卫星和测站的数量比,这与理论分析结论一致。对于实际应用中更为普遍的测站数量大于卫星数量的情况,新方法将减少独立双差模糊度选取的计算时间,且测站数越多,其优势越明显。

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