Scholarlink

<p>We present techniques for estimating key parameters of OneWeb’s Ku-band downlink signal (10.7–12.7 GHz) and reveal it as a single-carrier QPSK signal with a 230.4 MHz symbol rate. The techniques also estimate the signal’s roll-off factor and center frequencies. We further provide the first published account of OneWeb signal demodulation, revealing the basic frame structure of the downlink signal, including a synchronization sequence that repeats every millisecond and is common across all beams, channels, and satellites. Identifying this sequence enables making time-of-arrival measurements from OneWeb signals. These findings contribute to the growing body of research focused on repurposing low-Earth-orbit satellite communication signals for positioning, navigation, and timing.</p>

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Signal parameter estimation and demodulation of the OneWeb Ku-band downlink

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月2日

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  • Zacharias M. Komodromos,
  • Todd E. Humphreys

摘要

We present techniques for estimating key parameters of OneWeb’s Ku-band downlink signal (10.7–12.7 GHz) and reveal it as a single-carrier QPSK signal with a 230.4 MHz symbol rate. The techniques also estimate the signal’s roll-off factor and center frequencies. We further provide the first published account of OneWeb signal demodulation, revealing the basic frame structure of the downlink signal, including a synchronization sequence that repeats every millisecond and is common across all beams, channels, and satellites. Identifying this sequence enables making time-of-arrival measurements from OneWeb signals. These findings contribute to the growing body of research focused on repurposing low-Earth-orbit satellite communication signals for positioning, navigation, and timing.