GNSS NLOS pseudorange correction based on skymask for smartphone applications

Hoi Fung Ng, Guohao Zhang, Li Ta Hsu

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

2 Citations (Scopus)

Abstract

In urban canyons, smartphone users experienced great inconvenience in inaccurate GNSS positioning. The development of 3D mapping aided (3DMA) GNSS is regarded as one solution for this challenge. Several ideas in 3DMA GNSS are proposed including, 1) non-light-of-sight (NLOS) measurement exclusion based on the 3D building model, 2) GNSS shadow matching, 3) ray-tracing based 3DMA GNSS, 4) likelihood-based 3DMA GNSS, etc. Recently, researches show the integration of these 3DMA GNSS methods can enhance the positioning accuracy. For example, GNSS shadow matching integrates with likelihood-based approach can reach a performance of less than 10 meters in most urban areas of cities. However, the performance of this state-of-the-art method is not as satisfactory in the deep urban canyons of mega Asian cities such as Hong Kong. In deep urban canyons, the number of NLOS affected measurements became excessive. About 75% of total measurement could be affected by NLOS. To achieve 10 meters level of positioning performance, the NLOS measurement must be corrected. Ray-tracing based 3DMA GNSS aims to correct the pseudorange delay caused by NLOS reflection. It is proven effective in the urban canyons in Tokyo, Japan. However, its computation load is immense. We proposed a skymask (which is the skyplot with building boundaries) aided NLOS correction method, which can be regarded as an accelerated ray-tracing 3DMA GNSS method. Instead of using this skymask method standalone, this paper integrates the state-of-the-art 3DMA GNSS with our proposed skymask aided method. According to the experiment results, the NLOS correction generated by the skymask method further improves the performance of the integration of GNSS shadow matching and likelihood based method.

Original languageEnglish
Title of host publicationProceedings of the 32nd International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2019
PublisherInstitute of Navigation
Pages109-119
Number of pages11
ISBN (Electronic)0936406232, 9780936406237
DOIs
Publication statusPublished - Sep 2019
Event32nd International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2019 - Miami, United States
Duration: 16 Sep 201920 Sep 2019

Publication series

NameProceedings of the 32nd International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2019

Conference

Conference32nd International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2019
CountryUnited States
CityMiami
Period16/09/1920/09/19

ASJC Scopus subject areas

  • Communication
  • Computer Science Applications
  • Information Systems
  • Software
  • Electrical and Electronic Engineering
  • Computer Networks and Communications

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