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<p>BDS-3 geostationary orbit (GEO) satellites can deliver real-time precise point positioning (PPP) service through B2b signal, but they are susceptible to signal blockage. The limitations of PPP-B2b nominal validity periods (i.e., 96-s orbit and 12-s clock offset corrections) render the positioning service unavailable during PPP-B2b signal interruptions. Moreover, PPP needs to be reinitialized upon signal reacquisition. The PPP-B2b corrections have the potential to be predicted since they are applied to broadcast ephemeris. To ensure PPP continuity during short outages of PPP-B2b service and avoid frequent reinitializations, we propose a prediction method for PPP-B2b products, in which broadcast ephemeris update situations during PPP-B2b signal interruptions are carefully considered. We systematically assess real-time PPP accuracy under two conditions of broadcast ephemeris (updated and non-updated) during PPP-B2b signal interruptions lasting 1 to 30&#xa0;min as well as convergence time after reacquiring signal. Results indicate that BDS-3/GPS dual-system achieves 6.2, 5.5 and 13.3 cm in the east, north and up directions during a 30&#xa0;min interruption without broadcast ephemeris update, and 10.1, 8.8 and 21.8 cm in the three directions with broadcast ephemeris update. Moreover, BDS-3 single-system and BDS-3/GPS dual-system achieve instantaneous convergence upon signal reacquisition, whereas GPS single-system requires 6.5 and 14.0&#xa0;min to converge using non-updated and updated broadcast ephemeris, respectively. The accuracy of predicted ephemeris for GPS and BDS-3 degrades to broadcast ephemeris levels after 90.5 and 119.0&#xa0;min of interruptions, respectively. These results demonstrate that the proposed method can ensure PPP continuity during PPP-B2b signal interruptions and avoid frequent reinitializations.</p>

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Sustaining real-time PPP with predicted precise corrections during short outages of BDS-3 PPP-B2b service and its rapid convergence upon signal reacquisition

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Chen Yang,
  • Lin Pan

摘要

BDS-3 geostationary orbit (GEO) satellites can deliver real-time precise point positioning (PPP) service through B2b signal, but they are susceptible to signal blockage. The limitations of PPP-B2b nominal validity periods (i.e., 96-s orbit and 12-s clock offset corrections) render the positioning service unavailable during PPP-B2b signal interruptions. Moreover, PPP needs to be reinitialized upon signal reacquisition. The PPP-B2b corrections have the potential to be predicted since they are applied to broadcast ephemeris. To ensure PPP continuity during short outages of PPP-B2b service and avoid frequent reinitializations, we propose a prediction method for PPP-B2b products, in which broadcast ephemeris update situations during PPP-B2b signal interruptions are carefully considered. We systematically assess real-time PPP accuracy under two conditions of broadcast ephemeris (updated and non-updated) during PPP-B2b signal interruptions lasting 1 to 30 min as well as convergence time after reacquiring signal. Results indicate that BDS-3/GPS dual-system achieves 6.2, 5.5 and 13.3 cm in the east, north and up directions during a 30 min interruption without broadcast ephemeris update, and 10.1, 8.8 and 21.8 cm in the three directions with broadcast ephemeris update. Moreover, BDS-3 single-system and BDS-3/GPS dual-system achieve instantaneous convergence upon signal reacquisition, whereas GPS single-system requires 6.5 and 14.0 min to converge using non-updated and updated broadcast ephemeris, respectively. The accuracy of predicted ephemeris for GPS and BDS-3 degrades to broadcast ephemeris levels after 90.5 and 119.0 min of interruptions, respectively. These results demonstrate that the proposed method can ensure PPP continuity during PPP-B2b signal interruptions and avoid frequent reinitializations.