Low-cost software-defined GPS simulator with the capability of time synchronization

Woohyun Kim, Jiwon Seo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, a low-cost software-defined Global Positioning System (GPS) simulator for indoor positioning is proposed. The purpose of the proposed GPS simulator is to generate GPS signals so that the users can obtain the desired positions in an indoor environment with conventional GPS receivers. Since some commercial GPS receivers cannot properly provide position solutions if the calculated time based on the simulated signals is earlier than the last measured time based on the actual signals, the proposed GPS simulator generates GPS signals that do not cause this problem. In order to achieve this, an outdoor receiver was utilized to retrieve live ephemeris data, and the proposed GPS simulator generated baseband GPS signals that can provide a desired indoor position and time based on the ephemeris data. During the process of baseband GPS signal generation, time delay in the simulation process was compensated. Then, the baseband signals were modulated to GPS L1 frequency and were broadcast as radio frequency (RF) signals using a software-defined radio platform. The proposed GPS simulator was implemented using a u-blox M8T as an outdoor receiver and a USRP N210 as a software-defined radio platform. The performance of the proposed simulator was validated with another u-blox receiver as a user. The u-blox receiver successfully acquired the desired position with the simulated RF signals that were transmitted via a coaxial cable to the receiver.

Original languageEnglish
Title of host publicationInternational Conference on Control, Automation and Systems
PublisherIEEE Computer Society
Pages1087-1090
Number of pages4
ISBN (Electronic)9788993215151
Publication statusPublished - 2018 Dec 10
Event18th International Conference on Control, Automation and Systems, ICCAS 2018 - PyeongChang, Korea, Republic of
Duration: 2018 Oct 172018 Oct 20

Publication series

NameInternational Conference on Control, Automation and Systems
Volume2018-October
ISSN (Print)1598-7833

Other

Other18th International Conference on Control, Automation and Systems, ICCAS 2018
CountryKorea, Republic of
CityPyeongChang
Period18/10/1718/10/20

All Science Journal Classification (ASJC) codes

  • Artificial Intelligence
  • Computer Science Applications
  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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  • Cite this

    Kim, W., & Seo, J. (2018). Low-cost software-defined GPS simulator with the capability of time synchronization. In International Conference on Control, Automation and Systems (pp. 1087-1090). [8571587] (International Conference on Control, Automation and Systems; Vol. 2018-October). IEEE Computer Society.