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]

Group 1 - The core issue discussed is the temporary loss of GPS signal accuracy when driving on overpasses due to physical obstructions like bridges and buildings, which can interfere with satellite signals [1] - The Beidou system provides stable and precise signals, but complex environments can cause momentary disruptions in signal reception, leading to navigation inaccuracies [1] - When vehicles are on overpasses, the physical structures create "urban canyons" that block direct signals from satellites, resulting in reliance on weaker reflected signals that can mislead the device [1] Group 2 - The article highlights that the Beidou system's high precision can sometimes amplify the fluctuations in positioning data during signal loss, causing further confusion in navigation [1] - It mentions that as ground receiver algorithms improve, the issues related to signal reflection and misjudgment of location will gradually be resolved [1]