UAS C2 Spectrum Allocation for RF Interference Mitigation
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Solution Overview
Problem
The finite UAS aviation safety RF spectrum limits the number of unmanned aircraft systems (UAS) that can operate safely beyond visual line of sight (BVLOS) due to spectrum interference, necessitating robust command and control (C2) datalink planning and mitigation of RF interference.
Innovation Solution
Dynamic allocation and redefinition of C2 channels, establishing connections in non-interference spectrum portions, and adjusting bandwidth to manage UAS operations, including switching to adjacent control stations and using directional antenna elements to minimize interference and optimize spectrum usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional spectrum planning is used to account for worst-case RF interference scenarios, then UAS safety is improved, but the number of UAS able to use the protected spectrum in a given area is limited
Solution Approach 1:
The patent implements dynamic spectrum allocation where the control station continuously monitors RF interference conditions and dynamically assigns control spectrum channels to UAS based on current interference levels. This allows the system to adapt to changing conditions rather than using static worst-case planning, thereby increasing UAS density while maintaining safety through real-time adjustments to spectrum assignment
Solution Approach 2:
The system changes the parameter of spectrum channel assignment from fixed to variable based on measured interference conditions. By monitoring RF interference in real-time and adjusting which channels are assigned to which UAS dynamically, the system optimizes spectrum utilization while preventing interference, thus resolving the contradiction between safety and UAS density
2Quantity of substance
If closer channel spacing is implemented to increase UAS capacity, then UAS density is improved, but RF interference between UAS increases
Solution Approach 1:
The patent applies local quality by assigning different spectrum channels to different UAS based on their specific spatial locations and interference environments. Rather than using uniform channel spacing for all UAS, the system tailors channel assignment to local conditions, allowing closer effective spacing in low-interference areas while maintaining safety margins where interference is problematic
Solution Approach 2:
The system dynamically adjusts channel spacing and assignment based on real-time interference measurements. When interference levels are low, closer channel spacing is permitted to increase capacity; when interference increases, the system dynamically reassigns channels to maintain safety, thus adaptively resolving the contradiction between density and interference
3Productivity
If the control station establishes C2 connections to multiple concurrently operating UAS, then UAS operational capacity is improved, but spectrum resources are depleted
Solution Approach 1:
The patent implements periodic time-division multiplexing where the control station assigns different time slots to different UAS for spectrum access. This allows multiple UAS to share the same spectrum resources by taking turns, effectively increasing operational capacity without depleting spectrum resources, as each UAS receives dedicated access during its assigned time slot
Solution Approach 2:
The system merges multiple UAS operations into shared spectrum resources through dynamic time-division multiplexing. By combining the spectrum access of multiple UAS into a coordinated time-division scheme, the system achieves higher overall operational capacity while maintaining efficient use of limited spectrum resources
Data Source
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AI summary
An unmanned aircraft system (UAS) control apparatus is disclosed. In embodiments, the UAS control apparatus is embodied in a control station to manage command and control (C2) functions for UAS operations in a designated coverage volume including a geofenced interference region proximate to the control station, controlling each UAS via connections on a spectrum of C2 channels. The UAS control apparatus generates flight plans for UAS operations, providing separation and keeping UAS operations away from the control station to minimize RF interference with other UAS C2 connections. Should a UAS be required to operate proximate to the control station, the UAS control apparatus employs dynamic spectrum management with respect to other concurrently operating UAS to eliminate, reduce, or mitigate RF interference resulting from the encroaching UAS.