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- 2017
北斗卫星伪距码偏差特性及其影响分析
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Abstract:
在北斗导航卫星伪距码偏差特性分析的基础上，建立了倾斜地球同步轨道卫星（IGSO）和中轨卫星（MEO）的伪距码偏差多项式改正模型；并利用星间单差宽巷小数周一致性，分析建立北斗地球同步轨道卫星（GEO）卫星伪距码偏差改正模型。采用武汉大学北斗试验网、中国陆态网络和MGEX网不同位置、不同类型接收机观测数据进行分析验证，结果表明，北斗卫星伪距码偏差特性与观测值频率、卫星类型相关，所有GEO和IGSO卫星变化规律相同，所有MEO卫星变化规律相同，与接收机类型、测站位置和观测时间无关，偏差值大小随卫星高度角变化，其变化规律稳定，可以采用建立的两类改正模型（GEO/IGSO和MEO）进行修正。通过偏差修正后的伪距无电离层组合的残差、双频SPP以及单频PPP三个方面验证了伪距码偏差改正模型的正确性
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