聊城上空的“幽灵”干扰，重大民航GPS干扰事件“元凶”现形

Core Viewpoint - The article discusses a significant GPS signal interference issue affecting civil aviation safety in Shandong, China, which was traced back to unauthorized equipment set up by a local enterprise [1][4]. Group 1: Incident Overview - The issue began in April when civil aviation authorities reported severe GPS signal interference over specific areas in Liaocheng, leading to potential flight safety hazards [2]. - Initial monitoring efforts by the Liaocheng Radio Monitoring Center failed to identify the source of interference despite extensive low-altitude checks [2][3]. Group 2: Investigation and Analysis - Technical personnel analyzed detailed flight data to identify patterns in the interference, leading to a focused search around the Yellow River area [3]. - A critical discovery was made when a drone lost GPS signal at approximately 100 meters altitude, confirming the presence of a disturbance [3]. Group 3: Resolution and Collaboration - The monitoring center established a real-time communication mechanism with civil aviation departments to enhance data analysis and pinpoint the interference source [4]. - The interference was ultimately traced to unauthorized equipment at a local enterprise in Pingyin County, which was responsible for the GPS signal disruption [4]. Group 4: Lessons Learned - The successful resolution of the GPS interference case highlights the importance of innovative thinking, technical adaptation, and inter-departmental collaboration in addressing complex radio interference issues [5].