Sparse Signal Bands Selection for Precise Time-based Ranging in Terrestrial Positioning

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Abstract

Time-based ranging accuracy is inversely proportional to the signal bandwidth. A larger the signal bandwidth leads to a higher accuracy of time delay estimation, but more complex hardware is needed. Alternatively, we explore the idea of using multiple narrow signal bands (e.g., 10 MHz of each) to create a large virtual signal bandwidth, which maintains the spectral efficiency but largely improves the ranging accuracy. Considering the impact of multipath, the propagation delay of the LoS path is computed from the estimated channel impulse response (CIR). In this paper, we propose an approach to sparsely select signal bands for ranging and positioning based on convex optimization. The Cramér-Rao lower bound (CRLB) for the propagation delay and gain estimators, as a performance criterion, is employed in the constraint of the optimization. The CRLB is derived in a two-path channel, so that the accuracy and the correlation between the LoS path and the reflection are taken into account. Experiments are conducted in a laboratory environment to illustrate the proposed signal design methodology dedicated for ranging with a sub-decimeter accuracy.

Original languageEnglish
Title of host publication2020 IEEE/ION Position, Location and Navigation Symposium (PLANS)
PublisherIEEE
Pages1372-1380
Number of pages9
ISBN (Electronic)978-1-7281-0244-3
ISBN (Print)978-1-7281-9446-2
DOIs
Publication statusPublished - 2020
Event2020 IEEE/ION Position, Location and Navigation Symposium, PLANS 2020 - Portland, United States
Duration: 20 Apr 202023 Apr 2020

Conference

Conference2020 IEEE/ION Position, Location and Navigation Symposium, PLANS 2020
CountryUnited States
CityPortland
Period20/04/2023/04/20

Keywords

  • convex optimization
  • Cramér-Rao lower bound
  • multipath channel
  • OFDM
  • ranging
  • time delay estimation

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