HAPS Feeder Link Interference Detection via 3D Spatial Modeling
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Solution Overview
Problem
As the number of movable aerial-floating type radio relay apparatuses increases in a given area, interference between their feeder links can occur, leading to deteriorated radio communication quality or disconnection of the feeder link.
Innovation Solution
An interference detection system that generates three-dimensional feeder-link model elements based on the positions of communication relay apparatuses and gateway stations, determining interference by analyzing distances and potential contact between line segments and spheres in a three-dimensional space model, and predicting interference based on flight parameters and past data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of movable aerial-floating type radio relay apparatuses increases in a same area, then the communication coverage and capacity are improved, but interference occurs between the feeder links which deteriorates radio communication quality or causes disconnection
Solution Approach 1:
The system performs preliminary interference detection by generating three-dimensional feeder-link model elements representing current and future positions of communication relay apparatuses. The determination section calculates distances between line segments and receiving points in advance to predict potential interference before it occurs, allowing preventive measures to be taken.
Solution Approach 2:
The patent introduces an interference detection system as an intermediary between multiple communication relay apparatuses. This system acts as a mediator by collecting position information from multiple apparatuses, generating their feeder-link model elements, and determining interference relationships, thereby preventing direct interference between the apparatuses.
2Measurement precision
If real-time interference detection is performed between multiple movable communication relay apparatuses, then interference can be identified, but the system complexity and computational requirements increase
Solution Approach 1:
The system creates simplified three-dimensional model elements (line segments and receiving points) that copy the essential geometric and positional characteristics of the actual feeder links. These model elements represent the transmitting points, receiving points, and beam directions without requiring complex simulations of the complete radio propagation paths, thereby reducing computational complexity while maintaining detection accuracy.
Data Source
AI summary
It is detected of an interference between feeder links of communication relay apparatus, which tends to occur when the number of movable aerial-floating type communication relay apparatus increases in a same area. Plural feeder-link model elements are generated with respect to the plural communication relay apparatuses, wherein each of which a feeder-link receiving point corresponding to a position of the communication relay apparatus, a feeder-link transmitting point corresponding to a position of a gateway station, and a line segment connecting the feeder-link receiving point and the feeder-link transmitting point to each other in a three-dimensional space model. An occurrence of interference between feeder links is determined based on distances between the line segment and the feeder-link receiving point among feeder-link model elements different from each other on the three-dimensional space model.