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随着全球导航卫星系统(Global Navigation Satellite System, GNSS)的发展，智能终端在导航定位和位置服务中的应用日趋广泛，但是针对其GNSS原始观测数据的综合研究分析不足。选取具有代表性的智能手机，从数据完整率、周跳比、信噪比(Signal to Noise Ratio, SNR)、多路径误差、卫星可见数和伪距单点定位等方面，综合评估智能手机的GNSS数据质量及定位精度。研究结果表明，智能手机的锁星能力及GNSS数据质量水平存在一定差异，其BDS数据完整率最高为94.73%,GLONASS最低为81.14%;大部分周跳比相对测量型接收机略差，个别相差较大；SNR均值最大值为35.19 dB-Hz,同一频点SNR均值的差值最大为14.85 dB-Hz; L5频点的多路径误差均值最小为0.72 m。智能手机观测数据质量整体低于测量型接收机，并非双频手机的所有数据质量优于单频手机，L5/E5信号的多路径抑制功能并非对所有的智能手机都适用。双频信号比单频信号能更有效地对抗多路径效应，提升定位精度。
Abstract：With the development of the Global Navigation Satellite System(GNSS), intelligent terminals are widely used in navigation, positioning and location services. However, the comprehensive analysis of GNSS raw observation data is rare. GNSS data quality and positioning accuracy of representative smartphones are comprehensively analyzed and evaluated from the aspects of data integrity rate, cycle slip rate, Signal to Noise Ratio(SNR), multipath error, satellite visible number and single point positioning. The results show that there are some differences in the satellite locking capability and GNSS data quality of smartphones. The data integrity rate of BDS is the highest 94.73%, while the data integrity rate of GLONASS system is the lowest 81.14%. Most of smartphones' cycle slip rate is slightly lower than geodetic receiver, and the difference of individual smartphone is large. The maximum SNR of smartphone is 35.19 dB-Hz. The maximum difference of SNR at the same frequency point is 14.85 dB-Hz. The minimum multipath error of L5 frequency point is 0.72 m. The quality of observation data of smartphone is generally lower than that of geodetic receiver. Not all of the data quality of dual-frequency phones is better than single-frequency. L5/E5 signal multipath rejection feature does not apply to all smartphones. Dual-frequency signal can be more effectively against multipath effect than single-frequency signal, and improve positioning accuracy.
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基本信息:
中图分类号:TN967.1
引用信息:
[1]林楠,王乐,李孟园,等.Android智能手机GNSS数据质量综合评估及定位精度分析[J].无线电工程,2023,53(05):1015-1023.
基金信息:
国家重大科研仪器研制项目(42127802); 长安大学实验教学改革研究项目(20211815); 陕西省重点研发计划(2022ZDLSF07-12,2021LLRH-06)~~
2023-03-15
2023-03-15
2023-03-15