| 谷歌Nexus 9智能终端原始GNSS观测值的质量分析 |
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| 引用本文： | 刘万科,史翔,朱锋,王甫红,虞顺.谷歌Nexus 9智能终端原始GNSS观测值的质量分析[J].武汉大学学报(信息科学版),2019,44(12):1749-1756. |
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| 作者姓名： | 刘万科 史翔 朱锋 王甫红 虞顺 |
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| 作者单位： | 1.武汉大学测绘学院, 湖北 武汉, 430079 |
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| 基金项目： | 国家重点研发计划2016YFB0501803武汉市科技计划项目2018010401011270 |
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| 摘 要： | 从信噪比、伪距残差、相位残差等方面对开阔环境下的静态谷歌Nexus 9智能平板终端的原始全球导航卫星系统（Global Navigation Satellite System，GNSS）观测数据质量进行了分析评估，结果表明，Nexus 9平板的全球定位系统（Global Positioning System，GPS）、GLONASS观测值的信噪比比测量型接收机低10 dBHz左右；伪距精度分别为5.43 m、11.39 m，相位精度分别为4.44 mm、4.99 mm；相对于高度角来说，信噪比与伪距残差的相关性更强，更能反映观测数据的质量。在此基础上给出了信噪比定权的随机模型，并进行了开阔环境下的伪距单点定位测试。实验结果表明，基于信噪比定权的单点定位平面精度为2.74 m，高程精度为4.56m，比高度角定权精度提高了约26%。
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| 关 键 词： | Nexus 9智能平板 原始GNSS观测数据 数据质量评估 信噪比定权 单点定位 |
| 收稿时间： | 2018-11-06 |
Quality Analysis of Raw GNSS Observation of Google Nexus 9 Smart Tablet Terminal |
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| Affiliation: | 1.School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China2.Collaborative Innovation Center of Geospatial Technology, Wuhan 430079, China3.Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China4.Wuhan UniStrong Spatial Information Co. Ltd, Wuhan 430223, China |
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| Abstract: | This paper analyzes and evaluates the quality of the static raw Global Navigation Satellite System (GNSS) observations of Google Nexus 9 tablet in terms of signal-to-noise ratio(SNR), pseudorange residual and phase residual in the open sky. The results show that the SNR of Global Positioning System (GPS), GLONASS observations collected from the tablet is about 10 dBHz lower than normal surveying receiver; pseudorange accuracies of GPS, GLONASS observations are 5.43 m and 11.39 m, phase accuracies are 4.44 mm and 4.99 mm respectively. Compared with the elevation, the SNR is more relevant to the pseudorange residuals and reflects the quality of the observations better. On this basis, a stochastic model of SNR weighting is given and a standard point positioning test is conducted. The positioning precision is 2.74 m in horizontal component and 4.56 m in vertical component which are increased by about 26% compared with the elevation weighted positioning in the open sky. |
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