摘要
针对紧组合模型下 GPS/QZSS( quasi-zenith satellite system)短基线相对定位精度,基于
IGS(International GNSS Service)跟踪站组成的短基线 GPS、QZSS 重叠频率实测数据,推
导 GPS/QZSS 紧组合模型原理,评估了两个系统间偏差与模糊度固定情况,并且对比了松组合和
紧组合模型下的相对定位精度。结果表明,紧组合模型计算得到的卫星可见数与卫星空间几何分布
结构略优于松组合模型,相同类型接收机组成的短基线,GPS/QZSS 系统偏差几乎为 0,可忽略
不计;紧组合模型相较于松组合模型,能有效提升模糊度固定情况和相对定位精度,在截止高度角
为 30°且卫星可见数较少条件下提升效果尤为明显。
Abstract
Based on the measured data of the short baseline GPS and QZSS overlapping
frequencies composed of IGS(international GNSS service) tracking stations, this
paper derives the principle of the GPS/QZSS tight combination model, fixes the
deviation and ambiguity between the two systems , and compares the relative
positioning accuracies of the loose combination and tight combination models
targeting on GPS/QZSS(quasi-zenith satellite system) short baseline relative
positioning accuracy under tight combination model. The analysis results show that
the satellite visible number calculated by the compact combination model is slightly
better than the satellite combination geometric distribution structure. The short
baseline composed of the same type of receivers has a GPS/QZSS system deviation
of almost 0, which can be ignored. Compared with the loose combination model,
the tight combination model can effectively improve the fixed ambiguity and the
relative positioning accuracy, especially when the altitude angle is 30° and the
satellite visibility is less.
译
关键词
GPS/QZSS; 重叠频率; 紧组合; 相对定位
Keywords
GPS/QZSS; overlapping frequency; tight combination; relative positioning
译
准天顶系统(quasi-zenith satallite system,QZSS)是日本新一代区域定位系统,主要在亚太
地 区 提 供 导 航 与 定 位 服 务
[ 1 - 3 ]
。 QZSS 由 3 颗 倾 斜 地 球 同 步 轨 道 ( inclined geosynchronous
satellite orbit,IGSO)卫 星 和 1 颗中地球轨道(medium earth orbit,MEO)卫星组成,播
发 L1、L2、L5 3 个频率, 3 个频率 与 GPS 的 L1、L2、L5 频率 相同,与 GPS 有较好的兼 容 性
[ 4, 5]
。
相对定位技术目前主要有两种常用模型:①各系统自己选择参考卫星进行系统内差分即松组合模型;
②各系统选择同一个参考卫星进行系统间差分即紧组合模型。松组合模型是相对定位中常用的模型,