<p>Anomalous ionospheric disturbances notably impact the precision and reliability of global navigation satellite system positioning. With a tendency to manifest in low-latitude regions, they are challenging to anticipate with certainty. We used data from about 100 continuous operating reference stations (CORS) to examine ionospheric disturbances in the low-latitude region in Yunnan, China. We calculated total electron content (TEC) and detrended TEC, determined the intensity and range of disturbances, and evaluated the impact of anomalous disturbances on positioning precision using the precise point positioning with ambiguity resolution (PPP-AR) method for a single BeiDou navigation satellite system (BDS) at low-latitudes. The analysis focused on the data collected during UT 04:00–05:00 and UT 19:00–20:00 on DOY 116 of 2023. The results demonstrated that anomalous ionospheric disturbances at low latitudes markedly prolong the convergence time of a single BDS PPP-AR and reduce the precision of positioning. These effects are especially pronounced in phases and regions with frequent and strong ionospheric activities. To overcome these challenges, this study proposes an improved approach by increasing the satellite elevation angle mask above 25° to mitigate the influence of low-angle signals due to ionospheric perturbations. In this way, the stability and accuracy of single BDS PPP-AR positioning in low-latitude regions are significantly improved.</p>