LEO-MEO Optical Relay Architecture for Satellite Data Aggregation
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Solution Overview
Problem
Traditional RF downlinks in satellite communication systems lack sufficient bandwidth to manage the increasing volumes of data transmitted by satellite constellations, and existing optical intersatellite links face challenges in efficiently aggregating and routing vast data volumes to ground stations, leading to complex designs and high power requirements.
Innovation Solution
A communication system comprising LEO satellites in low-earth orbit and MEO trunk satellites, where LEO satellites establish optical inter-satellite links to aggregate data and relay it to MEO trunk satellites, which then forward it to ground stations, using a limited field of regard for LEO optical terminals to simplify design and reduce power consumption, and MEO satellites to relay data in both directions around their orbital plane for redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If optical intersatellite links are used to support high bandwidth data downlinks, then the bandwidth capability is improved, but the system complexity increases due to data aggregation requirements
Solution Approach 1:
The patent segments the satellite constellation into LEO satellites for data collection and MEO trunk satellites for data aggregation and relay. This division of labor reduces the complexity burden on individual optical links by organizing data flow through hierarchical levels, where LEO satellites handle local data aggregation and MEO satellites handle inter-orbital data relay.
Solution Approach 2:
The patent introduces MEO trunk satellites as intermediary nodes between LEO satellites and ground stations. These trunk satellites act as mediators that receive aggregated data from multiple LEO satellites and relay it to ground stations, simplifying the overall system architecture by providing a structured intermediate layer for data management.
2Productivity
If LEO satellites establish optical communication with trunk satellites, then data transmission capability is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic field of regard adjustment for LEO satellite optical terminals. The field of regard is configured to track and maintain communication with the appropriate MEO trunk satellite as the LEO satellite moves through its orbit, optimizing the transmission geometry to minimize power consumption while maintaining data transmission capability.
Solution Approach 2:
The patent optimizes transmission parameters including the field of regard angle and transmission timing based on the relative positions of LEO and MEO satellites. By adjusting these parameters dynamically, the system achieves efficient power usage while maintaining high data transmission capability through optimal optical link geometry.
3Productivity
If trunk satellites aggregate data from multiple LEO satellites, then the data throughput is improved, but the number of optical terminals required increases
Solution Approach 1:
The patent designs MEO trunk satellites with multi-functional optical terminals that can communicate with multiple LEO satellites and ground stations. Each trunk satellite serves multiple purposes: receiving data from various LEO satellites, relaying to different ground stations, and providing redundancy through multiple operational modes, thereby reducing the total number of dedicated terminals needed.
Solution Approach 2:
The patent utilizes the third dimension of space by placing trunk satellites in MEO orbit above the LEO constellation. This vertical separation in orbital dimensions allows trunk satellites to aggregate data from multiple LEO satellites simultaneously without requiring each LEO satellite to have direct ground contact, reducing the overall terminal count through spatial optimization.
4Device complexity
If a limited field of regard is used for LEO optical terminals, then the design complexity is reduced, but the communication coverage is limited
Solution Approach 1:
The patent compensates for the limited field of regard by implementing dynamic tracking and adjustment mechanisms. As LEO satellites orbit, their optical terminals dynamically adjust to maintain communication with MEO trunk satellites, ensuring continuous coverage despite the constrained field of regard. This dynamic approach preserves communication coverage while maintaining simple terminal design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach simplifies the design and operation of satellite communication systems, reduces power requirements, and efficiently manages high data throughput by aggregating data within LEO orbital planes and relaying it through MEO satellites to ground stations, minimizing the number of optical terminals needed and maintaining connectivity without data interruption.
Implementation Method 1
Each LEO satellite has an optical terminal with a limited field of regard that is capable of establishing optical communication with a corresponding trunk satellite
Implementation Method 2
A relay trunk satellite can establish optical communication with a specified ground station on the Earth
Data Source
AI summary
A communication system has a plurality of LEO satellites in a specified orbital plane and a plurality of trunk satellites in a medium earth orbit. Each LEO satellite acquires satellite-specific data and includes inter-satellite links with adjacent LEO satellites. Each trunk satellite includes inter-satellite links adjacent trunk satellites. One of the trunk satellites operates as a relay trunk satellite in position to maintain optical communication with a specified ground station on the Earth. Each LEO satellite has a limited field of regard to establish optical communication with any trunk satellite. A relay LEO satellite is configured to establish optical communication with a corresponding trunk satellite. The plurality of LEO satellites relay aggregated data to the relay LEO satellite. The relay LEO satellite relays the aggregated data to the corresponding trunk satellite. The relay trunk satellite relays the received aggregated data to the corresponding ground station.