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What is the difference between fixed-altitude mode and non-fixed-altitude mode for drones?
Release time:
2025-10-29
I. Definition and Working Principle
Fixed-Altitude Mode
It uses sensors such as barometers, GPS, or ultrasonic radars to monitor altitude in real time, and the flight control system automatically compensates for altitude fluctuations caused by airflow or load changes, keeping the drone stable around the set altitude. For example, barometer-based fixed-altitude has low cost but an altitude fluctuation of approximately 0.5 meters, while ultrasonic radar can achieve centimeter-level accuracy but is only suitable for low altitudes (10-20 meters).
Non-Fixed-Altitude Mode
It relies entirely on the operator to manually control the throttle stick to adjust the altitude, with no automatic compensation mechanism, and the aircraft's altitude changes in real time with the operation. This mode is commonly used in manual or attitude-stabilization modes, requiring the operator to continuously intervene to maintain the altitude.
II. Core Differences
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Control Method
- In fixed-altitude mode: The flight control system takes over altitude control. The operator only needs to fine-tune the altitude via the throttle, and there is a throttle dead zone (no response to small-scale operations).
- In non-fixed-altitude mode: The operator directly controls the throttle. The altitude response is sensitive, and there is no system assistance.
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Stability and Precision
- Fixed-altitude mode: Automatically suppresses altitude fluctuations, making it suitable for scenarios requiring stable altitude such as shooting and observation. However, sensor errors may cause deviations (e.g., GPS errors can reach 3-5 meters).
- Non-fixed-altitude mode: Offers high flexibility, but the altitude is prone to being affected by operational errors or the environment, resulting in poor stability.
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Applicable Scenarios
- Fixed-altitude mode: Suitable for tasks that require maintaining a fixed altitude, such as agricultural spraying and aerial photography. It particularly reduces operational burden in complex airflows.
- Non-fixed-altitude mode: Used for training or aerobatic flights, providing full control freedom but requiring higher skill levels.
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Application Scenarios, Advantages and Disadvantages
- Fixed-altitude mode
- Advantages: Reduces operational difficulty and improves safety.
- Disadvantages: Relies on sensor performance (e.g., barometers are affected by weather), and attention must be paid to the throttle position when switching modes to avoid sudden ascent or descent.
- Non-fixed-altitude mode
- Advantages: No sensor limitations and fast response.
- Disadvantages: High operational intensity, and novices are prone to losing control.
- Fixed-altitude mode
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