Indoor pseudolite positioning systems can provide GNSS-like ranging signals in GNSS-denied environments, but their signal quality is easily degraded by indoor multipath, attenuation, antenna displacement, blockage, and receiver tracking instability. This study proposes a multi-source signal quality assessment method for indoor pseudolite positioning based on monitoring-station observations. An experimental platform was established with pseudolite signal generation, transmitting antenna deployment, receiver-side acquisition, and GNSS-SDR processing. Three manually controlled degradation scenarios were designed: transmitting antenna displacement, signal attenuation, and signal blockage. Signal-, correlation-, tracking-, and observation-domain indicators were extracted, including C/N0, EVM, SCB-related indicators, tracking errors, lock indicators, pseudorange residuals, carrier-phase residuals, Doppler residuals, and observation-domain C/N0 residuals. These indicators were converted into degradation-oriented residuals, robustly normalized, and fused into an Indoor Pseudolite Quality Index (IPQI). Experimental results show that different indicators exhibit distinct responses to different degradation mechanisms. The proposed Indoor Pseudolite Quality Index further distinguishes transient antenna displacement, sustained signal attenuation, and intermittent signal blockage, demonstrating its effectiveness for integrated signal quality monitoring and scenario-level degradation assessment in indoor pseudolite positioning systems.
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Xu et al. (2026) studied this question.
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