Defying the Storm: Dagong Technology's Tethered UAV Creates the "Hengshan Miracle" with 72-Hour Emergency Communication

Hengshan Mountain, Hunan Province — As the last tourist captured the sea of clouds at the summit of Zhurong Peak, a different kind of drama was unfolding 1,300 meters above sea level at Leibofeng. On September 27, 2017, Beijing Dagong Technology Co., Ltd. orchestrated a miraculous feat in emergency communication, deploying its tethered UAV system to establish an "Airborne Lifeline" that restored critical signals to the Hengshan Scenic Area during the National Day Golden Rush, achieving a groundbreaking 72 hours of continuous, uninterrupted operation amidst severe storms.

The crisis began just 18 hours before the peak tourist influx, when a sudden severe convection weather event triggered landslides, paralyzing the core scenic area's communication base stations. With 3,000 daily tourists facing panic due to intermittent signals and traditional repair vehicles blocked by severed roads, Dagong Technology’s emergency response team arrived with three tethered UAV systems, turning a potential disaster into a testament to technological resilience.

Executing a "blitz deployment," the engineering team assembled the modular equipment in just 47 minutes. The UAV, carrying a lightweight 18kg 4G base station with a capacity for 5,000 concurrent users, ascended to combat the elements. Facing instantaneous Level 8 gusts (20.7m/s), the system activated its proprietary "Hurricane Mode," utilizing a three-axis gimbal for real-time angle adjustment and a dual-redundant flight control system to maintain stability with a vertical positioning accuracy of ±0.5 meters—a six-fold improvement over industry standards.

The operation marked a revolutionary breakthrough in emergency power supply. Implementing a "photoelectric hybrid" solution, the team integrated ground photovoltaic panels, lithium battery banks, and diesel generators to feed power through a mere 4.2mm diameter tether cable. This innovation supported a 300-meter altitude limit and ensured the system functioned flawlessly in temperatures dropping to -5℃, expanding the operational envelope from the standard -20℃~+55℃ to a staggering -30℃~+65℃.

The results rewrote industry rules for signal coverage. The tethered UAV extended the coverage radius from the traditional 1.5 kilometers to 5 kilometers, delivering a downlink rate of 120Mbps and an uplink of 30Mbps—effectively serving the area's massive connectivity demands. This 72-hour continuous operation shattered traditional endurance limits, outperforming standard solutions by 20 times.

Beyond the emergency rescue, this 2017 milestone catalyzed a transformation in "Smart Tourism" infrastructure. The success birthed the "Air View of Hengshan" project, enabling 24-hour panoramic live broadcasts that now attract over 800,000 tourists annually. Furthermore, the technology was pivotal in cultural heritage preservation, utilizing millimeter-level 3D modeling to archive over 500TB of data for the Nanyue Grand Temple, aiding its 2018 World Heritage application.

Validated by the harsh environment of Leibofeng, Dagong Technology’s product line has since iterated to its fourth generation. Today, the systems boast altitude limits increased to 600 meters, payload capacities breakthrough to 30kg, and enduring wind resistance up to Level 8. From a critical emergency rescue in the mountains to a permanent fixture in global smart scenic infrastructure, the "Hengshan Miracle" remains a definitive chapter in how tethered UAV technology redefines aerial guardianship.

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