Agricultural drones fly at low altitudes close to the crops, 
Altitude directly affects operational performance: flying too high can cause the spray to drift. 
Flying low leads to uneven spraying and increases the risk of collisions. How can we, in complex environments such as hilly terrain, paddy fields, and tall‑stalk crops, 
Achieving precise altitude hold and stable obstacle avoidance? Nanoradar’s drone radar has the answer.

The challenge of maintaining a constant altitude in complex environments for agricultural drones 
Drones must maintain a stable altitude of 1.5 to 3 meters above the crop canopy to ensure uniform spraying and minimize drift, missed spots, and double‑application. However, terrain undulations, canopy variability, and environmental conditions such as rain, fog, or dust can all disrupt altitude control. Even a deviation of just a few tens of centimeters can lead to wasted inputs, increased re‑spraying, and an elevated risk of collisions.

Multidimensional comparison shows that millimeter-wave radar is better suited for complex low-altitude environments. 
Barometric altimeters are low-cost but susceptible to environmental factors, while LiDAR offers high precision yet limited resistance to interference. In contrast, millimeter-wave radar combines centimeter-level accuracy, long-range detection, and all-weather operability, making it better suited to meet the stable perception requirements of agricultural drones in complex, low-altitude environments.

Agricultural UAV “1+2” Millimeter-Wave Radar Solution

One fixed‑altitude radar measures the distance to the ground or the crop canopy, while two forward‑ and rear‑facing obstacle‑avoidance radars continuously detect field obstacles such as utility poles, trees, and fences. Radar data is transmitted via MAVLink or DroneCAN to the APM and PX4 flight controllers, which then issue control commands to enable terrain‑following and collision‑avoidance warnings.

Success Story: Nanoradar Radar Helps a Certain Agricultural Drone Achieve Dual Upgrades in Efficiency and Safety!

1. Customer pain points: Pressure‑based and GPS‑based altitude‑hold solutions frequently fail in conditions such as rain, fog, mountainous terrain, and tall‑stalk crops, with aircraft crashes and operational malfunctions accounting for over 50% of all after‑sales complaints.

2. Solution: The “1+2” solution—consisting of one NRA24 altitude‑holding radar and two MR72 obstacle‑avoidance radars.

3. Customer Value: With a maximum accuracy of 0.02 m, scene coverage has increased from 60% to 95%, fault‑related complaints have dropped by 90%, overall after-sales costs have been reduced by 80%, and installation and commissioning time has been shortened by 90%, significantly enhancing the operational reliability of agricultural drones and accelerating large‑scale delivery efficiency.

Nanoradar UAV Radar Panorama

Nanoradar’s eight drone‑borne radar models feature high refresh rates of 50–500 Hz, detection ranges from 30 meters to over 3,000 meters, and positioning accuracy within ±0.02 meters. They are widely suited for applications in agricultural pest control, surveying and mapping, logistics, power‑line inspection, and more, with exports to over 30 countries and cumulative sales exceeding 100,000 units—fully validated by real‑world customer use.