基于智能手机的地下车库北斗伪卫星信号分析

Smartphone-based analysis of BeiDou pseudolites signals in underground garages

摘要:

随着全球卫星导航系统(GNSS, Global Navigation Satellite System)不断完善和经济社会快速发展,人们对室内位置服务需求日趋强烈,对于智能手机端的室内高精度定位技术研究蓬勃发展。针对商用智能手机接收北斗伪卫星信号实现室内定位难题,开展智能手机端的北斗室内伪卫星观测数据质量分析工作,选取多款主流品牌智能手机,分别从数据完整率、周跳比、载噪比、多普勒频移、载波相位等方面分析手机GNSS芯片性能,为室内停车场环境下智能手机伪卫星定位提供数据支撑,为北斗室内外一体化提供参考。研究表明：在地下停车场环境下,静止状态时部分手机的载噪比,星间载波相位差的数据连续性稳定性已经可以达到专用测量接收机水平；步行状态下,部分手机的星间数据差的数据质量甚至优于测量型接收机。

Abstract:

With the continuous improvement of Global Navigation Satellite System (GNSS) and the rapid development of economy and society, people"s demand for indoor location services is becoming stronger and stronger, and the research on indoor high-precision positioning technology for smartphones is booming. In order to solve the problem of indoor positioning by receiving BeiDou pseudolites signals from commercial smartphones, we carry out data quality analysis of BeiDou indoor pseudolites observation data on smartphones, and analyse the performance of mobile phone GNSS chips in terms of data completeness, weekly hopping ratio, carrier-to-noise ratio, Doppler shift, carrier phase, etc., so as to provide data support for pseudolites positioning of smartphones in the indoor car park environment, and to provide data support for BeiDou indoor and outdoor integration. It provides data for pseudo-satellite positioning of smartphone in indoor car park environment, and provides reference for BeiDou indoor and outdoor integration. The study shows that in the underground car park environment, the data continuity and stability of the carrier-to-noise ratio and the interstellar carrier phase difference of some mobile phones can reach the level of dedicated measurement receivers in the stationary state, and the data quality of the interstellar data difference of some mobile phones in the walking state is even better than that of the measurement receivers.