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<p>Anomalous ionospheric gradients are hazardous to the integrity of precision approach operations supported by Sea-Based Joint Precision Approach and Landing System (SB-JPALS). Carrier phase measurements collected from multiple short-baseline reference receivers are widely utilized to detect the threat of ionospheric gradients. However, the conventional carrier phase-based monitoring methods are vulnerable to the undetectable dead zones caused by ambiguity resolution failure, thereby degrading both navigation integrity and continuity. To mitigate the impact of ambiguity resolution failure on ionospheric gradient monitoring, a novel monitoring method based on the Boolean collaborative decision rule is proposed. The integrity risk and continuity risk associated with incorrect ambiguity resolution can be effectively bounded by adjusting the collaborative decision threshold. Dynamic experiments conducted using BeiDou Navigation Satellite System (BDS) demonstrate that the impact of ambiguity resolution failure can be isolated so that the undetectable dead zones can be eliminated. Furthermore, the proposed method improves monitoring sensitivity by 12% compared with conventional monitoring methods.</p>

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Sea-based JPALS ionospheric gradient monitoring based on multi-reference Boolean collaborative decision rule

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月7日

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  • Xin Xu,
  • Liang Li,
  • Jiachang Jiang,
  • Yilin Wei,
  • Ruifan Tang,
  • Xiuyun Shi

摘要

Anomalous ionospheric gradients are hazardous to the integrity of precision approach operations supported by Sea-Based Joint Precision Approach and Landing System (SB-JPALS). Carrier phase measurements collected from multiple short-baseline reference receivers are widely utilized to detect the threat of ionospheric gradients. However, the conventional carrier phase-based monitoring methods are vulnerable to the undetectable dead zones caused by ambiguity resolution failure, thereby degrading both navigation integrity and continuity. To mitigate the impact of ambiguity resolution failure on ionospheric gradient monitoring, a novel monitoring method based on the Boolean collaborative decision rule is proposed. The integrity risk and continuity risk associated with incorrect ambiguity resolution can be effectively bounded by adjusting the collaborative decision threshold. Dynamic experiments conducted using BeiDou Navigation Satellite System (BDS) demonstrate that the impact of ambiguity resolution failure can be isolated so that the undetectable dead zones can be eliminated. Furthermore, the proposed method improves monitoring sensitivity by 12% compared with conventional monitoring methods.