Characterisation and position-aiding performance analysis of Doppler observation from android smartphones

IF 1.9 4区工程技术 Q2 ENGINEERING, MARINE

Journal of Navigation Pub Date : 2023-03-01 DOI:10.1017/S0373463323000115

Zihan Peng, C. Gao, Hua Zou, Rui Shang, Qi Liu, Wu Zhao

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引用次数: 0

Abstract

Abstract It has been acknowledged that the Doppler is beneficial to the GNSS positioning of smartphones. However, analysis of Doppler precision on smartphones is insufficient. In this paper, we focus on the characteristic analysis of the raw Doppler measurement from Android smartphones. A comprehensive investigation of the Doppler was conducted. The results illustrate that the availability of Doppler is stable and higher than that of carrier measurements, which means that the Doppler-smoothed code (DSC) method is more effective. However, there is a constant bias between the Doppler and the code rate in Xiaomi MI8, which indicates that extra processing of the DSC method is necessary for this phone. Additionally, it is demonstrated that the relationship between the Doppler and C/N0 can be expressed as an exponential function, and the fitting parameters are provided. The numerical experiment in car-borne and hand-held scenes was conducted for evaluating the performance of the Doppler-aided positioning algorithm. For positioning, the improvement reaches 37 ⋅ 69%/37 ⋅ 14%/26 ⋅ 61% in the east, north and up components, respectively, after applying the Doppler aiding. For velocity estimation, the improvement reaches 29 ⋅ 62%/39 ⋅ 63%/29 ⋅ 37% in the three components, respectively.

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android智能手机多普勒观测的特征化和位置辅助性能分析

摘要众所周知，多普勒技术有利于智能手机的GNSS定位。然而，在智能手机上对多普勒精度的分析还不够。本文重点分析了安卓智能手机原始多普勒测量的特性。对多普勒进行了全面的研究。结果表明，多普勒的可用性是稳定的，并且高于载波测量的可用性，这意味着多普勒平滑码（DSC）方法更有效。然而，小米MI8的多普勒和码率之间存在恒定的偏差，这表明DSC方法的额外处理对这款手机来说是必要的。此外，还证明了多普勒和C/N0之间的关系可以表示为指数函数，并提供了拟合参数。在车载和手持场景中进行了数值实验，以评估多普勒辅助定位算法的性能。在定位方面，应用多普勒辅助后，东分量、北分量和上分量的改善分别达到37∙69%/37∙14%/26∙61%。对于速度估计，三个分量的改进分别达到29·62%/39·63%/29·37%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Navigation 工程技术-工程：海洋

CiteScore

6.10

自引率

4.20%

发文量

审稿时长

4.6 months

期刊介绍： The Journal of Navigation contains original papers on the science of navigation by man and animals over land and sea and through air and space, including a selection of papers presented at meetings of the Institute and other organisations associated with navigation. Papers cover every aspect of navigation, from the highly technical to the descriptive and historical. Subjects include electronics, astronomy, mathematics, cartography, command and control, psychology and zoology, operational research, risk analysis, theoretical physics, operation in hostile environments, instrumentation, ergonomics, financial planning and law. The journal also publishes selected papers and reports from the Institute’s special interest groups. Contributions come from all parts of the world.