UAV Dynamic Beam Steering for Stable Ground Station Handover
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Solution Overview
Problem
Unmanned aerial vehicles (UAVs) face challenges in maintaining reliable communication links with ground stations due to changes in position and orientation, leading to signal strength loss and interference from neighboring transmissions.
Innovation Solution
Implementing dynamic beam steering on UAVs and ground stations, where antennas are adjusted based on real-time position calculations to maintain a direct line-of-sight communication link, using mechanical or electronic steering, and determining optimal times for signal measurements and handovers between ground stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UAV maintains a fixed antenna orientation, then the device complexity is reduced, but the signal strength deteriorates due to changes in position and orientation
Solution Approach 1:
The patent implements dynamic antenna steering where the antenna orientation is continuously adjusted based on the UAV's changing position and attitude. The system transitions from a static fixed orientation to a dynamic adaptive orientation that tracks the optimal communication path, resolving the contradiction between maintaining simple device architecture and preserving signal strength during flight maneuvers
Solution Approach 2:
The system employs feedback mechanisms by monitoring the UAV's position and orientation data, then using this information to adjust the antenna pointing direction in real-time. This closed-loop control ensures the antenna maintains optimal alignment with ground stations despite flight dynamics, addressing the signal strength deterioration caused by fixed orientation
2Reliability
If the antenna is continuously adjusted to maintain line-of-sight, then the communication link reliability is improved, but the loss of time for signal measurements and handovers increases
Solution Approach 1:
The system performs preliminary actions by pre-calculating and scheduling antenna steering movements to coincide with planned handover events. Rather than reactively adjusting the antenna during signal degradation, the system proactively positions the antenna for upcoming ground stations based on predicted flight paths, reducing the time lost during actual handover transitions
Solution Approach 2:
The patent implements periodic signal measurements and handover evaluations at optimized intervals rather than continuously. This periodic approach maintains communication reliability by checking links at strategically determined moments while minimizing the total time spent on measurements and handovers compared to continuous monitoring
3Object-affected harmful factors
If directional antennas are used to reduce interference, then the harmful factors from neighboring transmissions are reduced, but the device complexity increases due to multiple antennas and steering mechanisms
Solution Approach 1:
The patent applies local quality by using directional antennas that concentrate communication energy in specific spatial directions toward serving ground stations. This spatial selectivity creates localized high-gain beams that inherently reject interference from other directions, reducing harmful factors from neighboring transmissions while maintaining a relatively simple single-antenna or dual-antenna configuration
Solution Approach 2:
The system changes the antenna's directional parameter (pointing angle) dynamically based on flight conditions. By adjusting the beam direction parameter in real-time, the system maintains focused directional transmission and reception patterns that minimize interference reception, achieving interference reduction through parameter adaptation rather than through complex multi-antenna arrays
Data Source
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AI summary
Various embodiments include methods for dynamic antenna steering on an unmanned aerial vehicle (UAV). The methods may include orienting an antenna on the UAV towards a serving ground station based on the UAV's position, orienting the antenna towards a neighboring ground station when it is time to conduct signal measurements of the neighboring ground station, conducting the signal measurements while orienting the antenna towards the neighboring ground station, and reorienting the antenna towards the serving ground station. Methods further include orienting a ground station antenna towards a UAV by obtaining a position of the UAV, calculating a vector between the position of the UAVs and the ground station, determining a direction to steer a beam based on the calculated vector, and steering the beam to the determined direction for the UAV.