Quality assessment of Android smartphone with GNSS raw observations
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摘要: 随着全球卫星导航系统(GNSS)的不断建设,智能手机基于移动位置服务 (LBS)得到了迅猛发展. 文中选取市面上常见的3种手机机型,包括:三星S9+(Exynos)、华为Mate30和华为P40 Pro作为研究对象,并使用北斗星通UR4B0-D高性能GNSS接收机进行同步静态观测实验,从卫星可见数、载噪比(CNR)、卫星高度角和多路径误差等方面,对手机GNSS数据质量进行分析. 结果表明:不同型号手机在观测能力和数据质量方面存在明显差异. Android智能手机的GNSS数据质量较差,CNR较小,且CNR与卫星高度角无明显关系. 此外,多路径误差是影响Android智能手机高精度定位的主要误差项之一.
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关键词:
- Android智能手机 /
- GNSS原始观测值 /
- 数据质量评估 /
- 多路径误差 /
- 静态数据分析
Abstract: With the continuous construction of Global Navigation Satellite System (GNSS), the location-based service (LBS) of smart phones has rapidly developed. In this paper, several commonly used smartphone are selected as research objects, such as Samsung S9+(Exynos), Huawei Mate30, Huawei P40 Pro. the measurement receiver UR4B0-D from BDStar Navigation is used for synchronous static observation experiment. the GNSS raw data quality of Android smartphone is analyzed from the aspects of satellite visibility, carrier-to-noise ratio (CNR), satellite altitude angle, multipath error and so on. The results show that there are obvious differences in observation capabilities and data quality among different smartphones. Android smartphones have poor data quality and low CNR. The CNR of Android smartphones has no obvious relationships with the satellite altitude angle. In addition, multipath error is one of the main errors that affect the high-precision positioning of Android smartphones.-
Key words:
- Android smartphone /
- GNSS raw data /
- data quality assessment /
- multipath error /
- static data analysis
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表 1 Android API时钟和测量类字段信息
字段名 所属类 描述 TimeNanos GNSSClock 手机硬件时间/ns BiasNanos GNSSClock 手机本地时钟与GPST亚纳秒级钟差/ns FullBiasNanos GNSSClock 手机本地时钟与GPST纳秒级钟差/ns DriftNanosPerSecond GNSSClock 钟漂/(ns·s−1) TimeOffsetNanos GNSSMeasurement 手机TimeNanos的偏差修正量/ns ConstellationType GNSSMeasurement 星座类型 Svid GNSSMeasurement 卫星编号 ReceivedSvTimeNanos GNSSMeasurement GNSS信号在卫星端的发射时间/ns AccumulatedDelataRange GNSSMeasurement 载波相位观测值/m Cn0DbHz GNSSMeasurement CNR/(dB·Hz) PseudorangeRatemeterperSecond GNSSMeasurement 伪距变化率 CarrierFrequencyHz GNSSMeasurement 载波频率 表 2 三款智能手机具体参数
手机型号 芯片型号 可接收卫星频点 三星S9+(Exynos) Broadcom BCM4775 GPS L1、Galileo E1、QZSS L1、GLONASS G1、BDS B1 华为P40 Pro Hisilicon Hi1105 GPS L1+L5、Galileo E1+E5a、QZSS L1+L5、GLONASS G1、BDS B1 华为Mate30 Hisilicon Hi1103 GPS L1+L5、Galileo E1+E5a、QZSS L1+L5、GLONASS G1、BDS B1 表 3 不同终端G04卫星多路径误差
m 终端型号 MP1_RMS MP5_RMS 北斗星通UR4B0-D 0.014 4 0.010 8 华为P40 Pro 3.227 9 3.424 2 华为Mate30(整体) 2.923 8 4.695 8 华为Mate30(前5 000历元) 2.124 1 1.816 7 华为Mate30(后5 800历元) 3.507 5 6.284 1 -
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