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Adapting airborne SAR to multirotor platforms has never been a matter of simply mounting the payload and taking off. When a radar is installed on a multirotor platform, teams routinely run into hard-to-match vibration damping, unstable power supply, data and flight-control timing that are out of sync, and tangled wiring that makes assembly and disassembly slow, all of which directly affect the efficiency of emergency field flights and high-frequency revisit monitoring.

Across the vast mountainous and canyon regions of China, numerous high-voltage and ultra-high-voltage (UHV) transmission lines traverse mountains and ridges, serving as the vital arteries of energy transmission. Traditional optical UAV and laser inspections are easily obstructed by mountain fog, rain, and dense vegetation. Many hidden geological hazards and tower foundation deformations are difficult to identify in advance based solely on visible-light imagery. Manual on-foot inspections in mountainous areas are not only time-consuming and high-risk but also leave numerous blind spots, remaining a persistent challenge in power grid operation and maintenance for years.

Airborne Synthetic Aperture Radar (SAR) is a system that combines an airborne platform with synthetic aperture radar technology, enabling all-day, all-weather ground imaging and observation. Compared with conventional visible-light imaging, radar is not restricted by day and night or weather conditions, greatly improving reconnaissance efficiency. For this reason, the share of radar in remote-sensing applications has been growing steadily.

In October, the Loess Plateau hills and gullies stretch across Yan’an in northern Shaanxi. The flight team from Tianjing Yunhu arrived at the field operation site with airborne Synthetic Aperture Radar (SAR) equipment and long‑endurance fixed‑wing UAVs to kick off a new round of field remote‑sensing flight missions.

Suzhou Tianjing Yunhu Intelligent Technology Co., Ltd. was founded in 2023, initiated by one of the earliest domestic teams specializing in synthetic aperture radar (SAR) R&D. The company is dedicated to the research, development, manufacturing, sales, service, and technical promotion of synthetic aperture radar systems, with the vision of becoming a world-leading provider of SAR equipment and information services.

Synthetic Aperture Radar (SAR) actively emits electromagnetic waves and receives the reflected echoes. This unique imaging mechanism endows SAR with all-time, all-weather penetrating imaging capability, making it one of the indispensable technologies in the remote sensing field for more than half a century since SAR first emerged.