Aerial Vehicle Datalink Ground Station Selection via Signal Averaging
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Solution Overview
Problem
Current ground station selection logic in air-ground data communication systems is inefficient due to reliance on fixed signal strength thresholds and the last message's signal strength, leading to unnecessary handovers and overhead, especially with varying signal strengths and aperiodic message reception.
Innovation Solution
A method that calculates and compares the average signal strength over a predefined time period for each ground station, adjusting the number of samples based on message traffic density to select the optimal ground station for communication, reducing unnecessary handovers and improving network efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ground station selection logic uses only the signal strength of the last message received, then the selection process is simple and fast, but it causes unnecessary handovers and reduces network efficiency due to signal strength variations up to 20 dB
Solution Approach 1:
The system performs preliminary actions by storing multiple signal strength values in a data structure before making a handover decision. Instead of reacting to the last message alone, the avionics pre-collects and stores signal strength data from multiple messages, then evaluates this stored data to determine whether a handover is truly necessary, thereby preventing unnecessary handovers caused by temporary signal fluctuations
Solution Approach 2:
The system implements feedback by continuously monitoring signal strength values and comparing them against stored historical values. The avionics receives ongoing feedback about signal strength variations and uses this feedback to adjust handover decisions dynamically, ensuring that handovers occur only when signal quality genuinely deteriorates rather than due to normal variations
2Reliability
If the system implements signal strength averaging to reduce unnecessary handovers, then handover stability improves, but the complexity of signal processing and data management increases
Solution Approach 1:
The system segments the signal strength evaluation process by maintaining separate data structures for different ground stations. Each ground station has its own data structure storing its signal strength values independently, allowing the system to evaluate and compare signal strengths of multiple ground stations separately. This segmentation simplifies the overall processing by breaking down the complex multi-station evaluation into manageable individual station assessments
Solution Approach 2:
The system applies partial averaging by storing a limited number of recent signal strength values (e.g., the most recent 3-5 messages) rather than averaging all historical data. This partial action provides sufficient smoothing to prevent unnecessary handovers while avoiding the excessive computational burden of processing extensive historical data, achieving a practical balance between reliability and complexity
3Speed
If the avionics frequently handoff to different ground stations due to signal variations, then the system responds quickly to signal changes, but overhead increases and network efficiency decreases
Solution Approach 1:
The system performs preliminary evaluation of signal strength trends before initiating handover. By storing and analyzing multiple signal strength values in advance, the avionics can distinguish between temporary signal fluctuations and genuine signal deterioration, ensuring that handovers occur only when necessary. This preliminary action prevents premature or unnecessary handovers that would increase overhead without providing benefit
Solution Approach 2:
The system implements self-service by autonomously monitoring its own signal conditions and making handover decisions without external intervention. The avionics uses its stored signal strength data to self-evaluate whether a handover is needed, reducing reliance on external network coordination and minimizing the overhead associated with handover requests and acknowledgments
Data Source
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AI summary
A method for selecting a ground station for communication with an aerial vehicle is provided. The method comprises receiving at an aerial vehicle one or more messages from one or more ground stations. The method includes storing one or more signal strength values corresponding to the one or more received messages in a data structure for each respective one or more ground stations received during a predefined time period. The data structures for each of the one or more ground stations is updated. The average of the signal strength values stored in each data structure is calculated. The method compares the average signal strength of each of the one or more ground stations and selects which ground station the aerial vehicle is to communicate with based on predefined criteria.