开车到立交桥，手机导航为何突然就跟不上了？

Core Viewpoint - The article discusses the limitations of the BeiDou navigation system in complex urban environments, particularly when navigating over overpasses where signal obstruction occurs due to physical structures [1] Group 1: Technical Limitations - BeiDou provides stable and precise signals, but urban structures like overpasses can obstruct these signals, leading to temporary loss of accurate positioning [1] - The high precision of the BeiDou system can sometimes amplify fluctuations in positioning data during signal loss, causing navigation delays [1] Group 2: Signal Reflection Issues - When driving on overpasses, the physical environment creates "urban canyons" that block direct signals from navigation satellites, resulting in the phone receiving only weak or reflected signals [1] - Multiple reflections of the BeiDou signal between the overpass, guardrails, and vehicles can mislead the phone into miscalculating its position, causing apparent drift or lag in location tracking [1] Group 3: Future Improvements - The situation is expected to improve as ground receiver algorithms are optimized to better handle these signal challenges in complex environments [1]