基于智能手机GNSS伪距定位的运动距离和速度确定  

Determination of Distance and Speed of Motion by the Standard Point Positioning based on Smartphone GNSS

作　　者：葛在宸 王明华 GE Zaichen;WANG Minghua(School of Remote Sensing and Geomatics Engineering,Nanjing University of Information Science and Technology,210044,Nanjing,PRC)

机构地区：[1]南京信息工程大学遥感与测绘工程学院,南京210044

出　　处：《江西科学》2023年第6期1124-1130,共7页Jiangxi Science

基　　金：上海市空间导航与定位技术重点实验室开放基金项目(202103);国家自然科学基金面上项目(41974025)。

摘　　要：准确确定运动距离和速度有着重要的实际应用价值。使用智能手机GNSS观测值进行伪距单点定位,分别采用位置差分法和移动平均法,对手机的单点定位坐标进行修正,基于修正坐标计算运动距离和速度。结果表明,以手机作为流动站,无论采用高精度GNSS接收机(大地测量型)还是手机(导航型)作为基准站,位置差分改正后均无法显著提高流动站手机定位精度,这与手机端伪距单点定位(含对流层和电离层模型改正)误差的组成有关,即误差的主要部分为流动站与基准站间的非公共误差,无法通过差分消除;对手机的单点定位坐标序列进行移动平均,能显著改善坐标精度,由此计算得到的距离和速度与参考值相比,距离误差小于15 m(总距离约4 km),速度误差小于0.65 m/min(速度值为80~150 m/min),其精度与商业化运动手表的数据精度相当。It is of great practical value to determine the distance and speed of motion accurately.In this paper,the GNSS observation value of smart phone is used for the standard point positioning(SPP).We use the differencing and the moving average method to correct the smart phone’s standard point positioning coordinates,and then use the modified coordinates to calculate the distance and speed of motion.The results showed that no matter whether the high-precision geodetic GNSS receiver OR smartphone GNSS receiver was used as the base station,as long as the smart phone was used as the rover,smart phone positioning accuracy could not be significantly improved by position difference correction.It was related to the error composition of SPP(including tropospheric and ionosphere model correction)on the smart phone,that was,the main part of the error was the nonpublic error between the rover and the base station,which could not be eliminated by differencing.The distance and velocity derived from the coordinate time series filtered by moving average method were accurate:comparing with the result from roller measurements,the distance errors were less than 15 m(total distance larger than 4000 m),and the velocity errors were less than 0.65 m/min(the speed is 80~150 m/min),the accuracy was equivalent to the data accuracy of commercial sports watches.

关 键 词：全球卫星定位系统 安卓智能手机 差分GPS 动态定位误差 滑动平均法 

分 类 号：P228[天文地球—大地测量学与测量工程]