顾及DISB的智能手机伪距差分定位算法  

Pseudorange differential positioning algorithm for smartphones considering DISB

作　　者：李玉星 李广云[1] 吕葳 陈明剑[1] 蔡巍 李雪晴 LI Yuxing;LI Guangyun;LYU Wei;CHEN Mingjian;CAI Wei;LI Xueqing(Institute of Geospatial Information,Information Engineering University,Zhengzhou 450001,China;Xi′an Mapping Terminus,Xi′an 710054,China)

机构地区：[1]信息工程大学地理空间信息学院,郑州450001 [2]西安测绘总站,西安710054

出　　处：《导航定位学报》2024年第4期68-78,共11页Journal of Navigation and Positioning

摘　　要：为了提高智能手机在遮挡环境下的定位精度和可靠性,给出一种全球定位系统(GPS)、伽利略卫星导航系统(Galileo)、北斗卫星导航系统(BDS)组合的系统间紧组合伪距差分定位模型和适用于智能手机的高度角附加不确定度的随机模型。首先评估了L1/B1I和L1/E1频率间的伪距差分系统间偏差的大小与稳定性,结果表明,智能手机伪距差分系统间偏差可以保持稳定性。利用小米8、华为P40智能手机和实测相同及不同类型接收机进行对比验证,通过设置截止高度角方式模拟遮挡环境。实验结果表明:在45°截止高度角模拟遮挡环境情况下,应用紧组合伪距差分改正模型,小米8和华为P40智能手机平面定位精度分别提高了25.5%和32.4%。该方法可以提高智能手机在遮挡环境下定位的精度和可靠性。In order to enhance the positioning accuracy and reliability of smart phones in the occluded environment,a combined inter-system tightly combined pseudorange differential positioning model of the global positioning system(GPS),Galileo satellite navigation system(Galileo),and BeiDou navigation satellite system(BDS),as well as a random model with height angle additional uncertainty suitable for smart phones,was provided.Firstly,the size and stability of the inter-system bias of the pseudorange differential between the L1/B1I and L1/E1 frequencies were evaluated,and the results showed that the intersystem bias of the smart phone pseudorange differential system could maintain stability.By using the Xiaomi 8 and Huawei P40 smart phones and actually measuring the same and different types of receivers for comparative verification,the occluded environment by setting the cutoff altitude angle was simulated.The experimental results showed that:in the case of simulating the occluded environment with a 45°cutoff altitude angle and applying the tightly combined pseudorange differential correction model,the plane positioning accuracy of the Xiaomi 8 and Huawei P40 smart phones had been increased by 25.5%and 32.4%,respectively.This method could improve the positioning accuracy and reliability of smart phones in the occluded environment.

关 键 词：智能手机 全球导航卫星系统(GNSS) 伪距差分 伪距差分系统间偏差(DISB) 紧组合 

分 类 号：P228[天文地球—大地测量学与测量工程]