Investigating the Effects of Ionospheric Scintillation on Multi‐Frequency BDS‐2/BDS‐3 Signals at Low Latitudes

Ionospheric scintillation could seriously disrupt the signal tracking of global navigation satellite systems (GNSS), further causing positioning accuracy degradation or unavailability. BeiDou system (BDS), a newly developed GNSS by China, has begun to provide positioning, navigation, and timing service. The objective present study is investigate effects ionospheric on BDS-2 BDS-3 multi-frequency signals. monitor receiver data from four monitors in Brazil were collected October 2021 May 2022. results illustrate that S4(B2) S4(B3) linearly increase with S4(B1) for ≤ 0.6, which consistent weak scattering theories, average experimental ratios S4(B2)/S4(B1), S4(B3)/S4(B1), S4(B2)/S4(B3) are less than corresponding theoretical ones 6.1%, 4.4%, 1.9%, respectively. Meanwhile, as S4 values increase, lower-frequency saturates earlier higher ones, probability events B2 B3 signals approximately twice (S4 ≥ 0.7) B1 equatorial ionization anomaly (EIA) regions. To alleviate undesirable missing we first inter-frequency relationship distribution two significant spectral parameters, is, T (the strength phase noise at 1 Hz) p slope power density) jitter model among three BDS frequencies. Results show performances B1, B2, frequencies have correlation respectively, their more susceptible be impacted scintillation.