Android智能终端GNSS定位精度分析

目前，普通智能终端的平面定位精度在5 m左右。2016年，Google公司推出Android系统7.0版本，开始支持输出GNSS（global navigation satellite system）原始观测值。通过改正和计算，可以获得Android智能终端的伪码和载波相位观测值，从而实现较高精度的GNSS定位。研究采用华为P9手机进行，在观测条件良好的情况下，采集静态的GNSS原始观测数据，并采用多种方式分别进行定位解算，并分析其定位精度。同时，在相邻观测点放置NovAtel DL-V3-L1型接收机进行对比。实验表明通过静态下精密单点定位或者载波相位差分定位的方式，可以显著提升智能终端的定位精度，达到分米级水平。

Analysis of GNSS Positioning Precision on Android Smart Devices

In recent years, the positioning function of smart devices, such as mobile phone and tablets, gets more and more popular, which is a great convenience to people's daily life. Now, the best horizontal accuracy of positioning that most ordinary smart devices can achieve is about 5 meters. In 2016, Google Inc. launched Android Nougat (7.0) operating system, supporting the compatible smartphone and tablets to obtain global navigation satellite system (GNSS) raw measurements, which makes it possible to compute pseudorange and carrier phase measurements to achieve precise handset positioning. The target of this paper is to evaluate the precision of different positioning methods on the smart devices. A Huawei P9 smartphone was used as experimental devices and set statically in good observation condition to collect GNSS raw measurements. We compute the positioning precise, analyze the accuracy and compare the accuracy with that of the NovAtel DL-V3-L1 receiver which was set nearby at the same time. Experimental results show that the Huawei P9 smartphone can achieve decimeter-level positioning accuracy through precise point positioning or static relative surveying.