Improving GPS AutoNav orbit accuracy with onboard accelerometers

Jing Qiao, Wu Chen

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

1 Citation (Scopus)

Abstract

Autonomous navigation (AutoNav) is a crucial technique for enhancing the navigation satellite system, such as GPS, autonomy and decreasing systemic vulnerability. However, AutoNav using only inter-satellite link (ISL) observations can lead to constellation rotation problem over time, mainly due to the complex perturbations. The conservative perturbations, such as the Earth non-spherical perturbations, tidal perturbation, the solar, lunar attractions, etc. can be precisely modeled with latest force models. The non-conservative ones, mainly the Solar Radiation Pressure (SRP), on the other hand, are difficult to be modeled precisely and have become the main factors affecting AutoNav accuracy. Accelerometers onboard satellites are capable of measuring non-conservation forces and have been successfully used in the scientific missions, e.g., CHAMP, GRACE, and GOCE. This study investigates the feasibility of using accelerometers for GPS. Based on the IGS precise ephemerides, inter-satellite range measurements of decimeter accuracy (σ=0.31m) are simulated. AutoNav using only ISL measurements and ISL together with accelerometers have been carried out, respectively. The results show that AutoNav with accelerometer data can achieve 0.3 to 0.5m orbit accuracy in radial direction, less than 8m in the horizontal direction during the 180-day AutoNav period, several times better than that without accelerometer data. Also, the AutoNav performances of GPS and Beidou are compared.
Original languageEnglish
Title of host publication30th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS 2017
PublisherInstitute of Navigation
Pages1169-1177
Number of pages9
Volume2
ISBN (Electronic)9781510853317
Publication statusPublished - 1 Jan 2017
Event30th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS 2017 - Portland, United States
Duration: 25 Sep 201729 Sep 2017

Conference

Conference30th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS 2017
Country/TerritoryUnited States
CityPortland
Period25/09/1729/09/17

ASJC Scopus subject areas

  • Software
  • Computer Science Applications
  • Electrical and Electronic Engineering

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