| Citation: | KANG K，WANG Z P，FANG K，et al. Impact of IFB uncertainty on dual-frequency code carrier divergence monitoring[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（9）：2463-2472 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0649
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Code carrier divergence (CCD) monitor is one of the integrity monitors introduced by ground-based augmentation systems (GBAS), which is used to monitor the inconsistency between code pseudorange and carrier phase observations. Dual-frequency smoothing technology changes the test statistics and other parameters of CCD monitor, which affect the monitoring performance. Considering the inter-frequency bias (IFB) introduced in dual-frequency GBAS, the impact of IFB uncertainty on the dual-frequency CCD monitoring is analyzed based on the dual-frequency observation data of BDS B1I and B3I signals. The results show that under the influence of IFB uncertainty, the threshold of the monitor increases by 26.1%, resulting in a significant increase of the probability of missed detection (PMD) in the case of CCD fault. And the minimum detectable fault increases by 26.9%, which means a decrease in the sensitivity of the monitor. Meanwhile, the probability of the loss of integrity in the worst case increases from less than 10−14 to nearly 10−8, and the delay introduced by the airborne to meet the PMD requirement is larger, resulting in a slower response of CCD monitor and impacts the integrity of dual-frequency GBAS.
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