Estimation of Clock Drift in Symbol Duration for High Precision Ranging Based on Multiple Symbols of Chirp Spread Spectrum

Yeong-Sam KIM
Seong-Hyun JANG
Sang-Hun YOON
Jong-Wha CHONG

IEICE TRANSACTIONS on Communications   Vol.E93-B    No.6    pp.1633-1635
Publication Date: 2010/06/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.1633
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
chirp spread spectrum,  clock drift,  error of crystal oscillator,  ranging,  

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A new estimation algorithm of clock drift in symbol duration for high precision ranging, based on multiple symbols of chirp spread spectrum (CSS) is proposed. Since the permissible error of a crystal oscillator in CSS is relatively high given the need to lower device costs, ranging results are perturbed by clock drift. We establish the phenomenon of clock drift in multiple symbols of CSS, and estimate the clock drift in symbol duration based on phase difference between adjacent symbols. The proposed algorithm is analyzed, and verified by Monte Carlo simulations.