Abstract—The accuracy of the positi

Abstract—The accuracy of the positions of a pedestrian is veryimportant and useful information for the statistics, advertisement,and safety of different applications. Although the GPS chip ina smartphone is currently the most convenient device to obtainthe positions, it still suffers from the effect of multipath andnonline-of-sight propagation in urban canyons. These reflectionscould greatly degrade the performance of a GPS receiver. Thispaper describes an approach to estimate a pedestrian position bythe aid of a 3-D map and a ray-tracing method. The proposed approachfirst distributes the numbers of position candidates arounda reference position. The weighting of the position candidates isevaluated based on the similarity between the simulated pseudorangeand the observed pseudorange. Simulated pseudoranges arecalculated using a ray-tracing simulation and a 3-D map. Finally,the proposed method was verified through field experiments in anurban canyon in Tokyo. According to the results, the proposedapproach successfully estimates the reflection and direct paths sothat the estimate appears very close to the ground truth, whereasthe result of a commercial GPS receiver is far from the groundtruth. The results show that the proposed method has a smallererror distance than the conventional method.

結果 (英文) 1:

Abstract—The accuracy of the positions of a pedestrian is very
important and useful information for the statistics, advertisement,
and safety of different applications. Although the GPS chip in
a smartphone is currently the most convenient device to obtain
the positions, it still suffers from the effect of multipath and
nonline-of-sight propagation in urban canyons. These reflections
could greatly degrade the performance of a GPS receiver. This
paper describes an approach to estimate a pedestrian position by
the aid of a 3-D map and a ray-tracing method. The proposed approach
first distributes the numbers of position candidates around
a reference position. The weighting of the position candidates is
evaluated based on the similarity between the simulated pseudorange
and the observed pseudorange. Simulated pseudoranges are
calculated using a ray-tracing simulation and a 3-D map. Finally,
the proposed method was verified through field experiments in an
urban canyon in Tokyo. According to the results, the proposed
approach successfully estimates the reflection and direct paths so
that the estimate appears very close to the ground truth, whereas
the result of a commercial GPS receiver is far from the ground
truth. The results show that the proposed method has a smaller
error distance than the conventional method.

結果 (英文) 3:

摘要行人的位置准确度很高
重要的有用信息，如统计，广告，
以及不同应用的安全性。虽然GPS芯片
智能手机是目前最方便获得的设备
位置，它仍然受到多径和
城市峡谷中的非线性视线传播。这些反映
会大大降低GPS接收机的性能。这个
本文描述了一种通过以下方法估计行人位置的方法
借助三维地图和射线追踪方法。提议的方法
首先将职位候选人的数量分布在
参考位置。职位候选人的权重是
基于模拟伪距的相似性评估
以及观测到的伪距模拟伪距是
使用光线跟踪模拟和三维地图计算。最后，
通过现场试验，验证了该方法的有效性
东京的城市峡谷。根据结果，建议
方法成功地估计了反射和直接路径
估计值似乎非常接近实际情况
商用GPS接收机的结果离地面很远
真相。结果表明，该方法具有较小的计算量
误差距离比传统方法。