Dagong Technology DG-X50 Tethered UAV Breaks GNSS Denial Bottleneck with Satellite-Free Optical Navigation at 500m Altitude

Beijing, China — In a monumental leap for low-altitude economy technologies, Beijing Dagong Technology Co., Ltd. has officially shattered the GNSS denial bottleneck that has long crippled unmanned aerial vehicles in complex environments. Through a proprietary "Navigation Reconstruction" breakthrough, the company's latest DG-X50 tethered UAV has successfully executed a high-stakes national-level aerial live broadcast mission without relying on a single satellite signal. Utilising high-precision optical sensors and advanced laser ranging, the system achieved impeccably stable hovering and HD signal transmission at a 500-metre altitude, unequivocally establishing Dagong Technology as the global pioneer in satellite-free tethered drone navigation.

For decades, traditional drone stability has been heavily reliant on the Global Navigation Satellite System (GNSS). However, in extreme emergency and security scenarios—such as urban canyons, dense forests, and areas plagued by severe electromagnetic interference—satellite signals face obstruction or complete denial. This vulnerability has historically caused catastrophic instability or total loss of control. Addressing this deep-rooted industry pain point, Dagong Technology's DG-X50 has fundamentally shifted the positioning paradigm. Instead of looking to the sky for satellite validation, the drone's "Navigation Reconstruction" technology anchors its positioning baseline to its own high-precision optical sensors and intelligent algorithms, granting the platform unprecedented environmental adaptability and survival capabilities.

The core driver of this satellite-free positioning lies in the deep fusion of multi-source perception technologies. According to recently published patent information from the National Intellectual Property Administration, Dagong Technology has engineered a tethered UAV positioning system based on laser ranging. This innovative architecture integrates a laser rangefinder, a visual tracking identification module, and a sophisticated data processing module. By measuring the distance between the drone and at least three non-collinear 3D laser ranging points on the ground—whilst simultaneously tracking these points visually—the system calculates the drone's precise three-dimensional coordinates. This allows the DG-X50 to execute high-precision positioning even under bridges, indoors, or beneath thick forest canopies where GNSS signals are entirely absent.

To ensure unwavering reliability, the DG-X50 constructs a highly redundant, all-weather autonomous navigation architecture. Recognising that purely optical perception can be hindered by drastic lighting changes or dense dust, Dagong Technology fused Visual SLAM (VSLAM), Laser SLAM (LSLAM), and Visual Inertial Odometry (VIO) alongside IMU, barometer, and magnetometer data. Even in disaster scenes shrouded in thick smoke or dominated by intense electromagnetic interference, the system intelligently switches or fuses sensory data, maximising navigation precision and reliability.

The ultimate validation of this technological tour de force occurred during a recent CCTV national-level event. Facing a labyrinth of urban electromagnetic interference and massive building obstructions, the DG-X50 ascended to a 500-metre altitude. Deprived of GNSS access, it leveraged its visual positioning and laser ranging suite to maintain a staggering attitude control accuracy of ±0.01 degrees, ensuring uninterrupted, high-definition live broadcast transmissions.

Founded by a team of elite Tsinghua University alumni and headquartered in the Zhongguancun Yanqing Drone Innovation Base, Dagong Technology has solidified its position as the leader in industrial-grade tethered UAV systems. Notably, the DG-X50 is also the industry's first tethered drone platform to break the 600-metre high-altitude ceiling. By evolving from a mere long-endurance aerial platform into a high-precision intelligent node, Dagong Technology's tethered UAVs are now unleashing irreplaceable combat-ready value across emergency rescue, urban security, and border patrol operations, fundamentally redefining the future of aerial infrastructure.