Aircraft Position Control for Hovering Over Moving Landing Points
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Solution Overview
Problem
Existing aircraft position control systems struggle to maintain accurate hovering over a target landing point, especially when the target is moving, due to drift components in acceleration measurements.
Innovation Solution
The system employs an acceleration correction processing unit, a complementary filter, and a smoothing processing unit to correct and smooth the relative coordinates of the aircraft, removing drift components and ensuring stable positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If acceleration measurement is used for position control, then the aircraft can respond quickly to position adjustments, but drift components cause the position to deviate from the target landing point
Solution Approach 1:
The patent combines acceleration data from the accelerometer with velocity data from the Doppler navigation device and position data from the imaging device. By merging these multiple data sources through integration and filtering processes, the system achieves both fast response (from acceleration) and high position accuracy (from combined multi-sensor processing), resolving the contradiction between response speed and position accuracy.
Solution Approach 2:
The system continuously monitors the actual position of the aircraft using the imaging device and Doppler navigation, compares it with the target position, and uses this feedback to adjust the control commands. This closed-loop feedback mechanism corrects drift accumulation over time while maintaining responsive control, resolving the contradiction between fast response and long-term position accuracy.
2Measurement precision
If Doppler navigation is used to measure velocity, then velocity accuracy is improved, but the system complexity increases due to correction processing
Solution Approach 1:
The patent introduces an integration unit that acts as an intermediary between the Doppler navigation device and the control system. This unit performs the complex correction calculations by integrating corrected velocity over time to generate position information, thereby isolating the complexity of Doppler correction processing from the main control logic and simplifying the overall system architecture.
3Measurement precision
If image processing is used to acquire relative position, then position information is obtained, but processing time increases
Solution Approach 1:
The system performs preliminary processing of imaging data by continuously tracking the target landing point and pre-calculating relative position information as the aircraft approaches. This preliminary action reduces the computational burden during critical landing phases, allowing the system to maintain high position accuracy while minimizing processing delays when rapid response is needed.
Data Source
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AI summary
An aircraft position control system that keeps an aircraft at target coordinates in an inertial space with respect to a target landing point that moves includes an acceleration correction processing unit that, based on acceleration of the aircraft and an attitude of the aircraft, outputs first attitude correction acceleration for correcting the acceleration of the aircraft, a complementary filter that, based on the first attitude correction acceleration and inertial velocity of the aircraft, outputs second attitude correction acceleration in which a drift component included in the first attitude correction acceleration is removed, and a smoothing processing unit that, based on the second attitude correction acceleration and relative coordinates between the aircraft and the target landing point, outputs smoothed relative coordinates obtained by smoothing the relative coordinates.