Satellite Clusterhead Architecture for Low-Latency Data Relay
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Solution Overview
Problem
Traditional satellite infrastructure is costly and inefficient due to the use of large, powerful satellites, and existing small form factor satellites face challenges in data collection, management, and transmission, particularly in distinguishing signals and coordinating data retrieval across a large constellation.
Innovation Solution
A network of small satellites with on-board processors and a custom communication protocol that allows for efficient data packet transmission between satellites and ground stations, using software-defined radio systems and a 'bent pipe' retransmission system to reduce latency and regulatory issues, enabling coordinated data collection and management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a large constellation of independent small satellites is used, then revisit time and message latency are greatly reduced, but data collection, management, local processing and transmission become much more complex
Solution Approach 1:
The patent introduces a clusterhead satellite as an intermediary node that collects data packets from multiple source satellites and relays them to ground stations. This mediator approach simplifies the complexity of direct ground station coordination for each satellite while maintaining fast data retrieval. The clusterhead acts as a local data aggregation point, reducing the communication overhead and coordination complexity in the large satellite constellation.
Solution Approach 2:
The satellite constellation is segmented into multiple clusters, each with a designated clusterhead satellite. This segmentation divides the large constellation into manageable units, making data collection and management more organized. Each cluster operates semi-independently with its own data aggregation point, reducing the overall system complexity while maintaining fast revisit times through the distributed cluster structure.
2Ease of operation
If existing communication protocols are used, then implementation is straightforward, but it becomes difficult to distinguish signals from individual satellites when contact regions overlap
Solution Approach 1:
The patent implements a custom protocol with unique local identifiers (satellite IDs) embedded in data packets transmitted by each satellite. This local quality differentiation allows ground stations to distinguish signals from individual satellites even when contact regions overlap. Each satellite's transmissions are marked with its unique identifier, enabling precise signal attribution without changing the overall protocol structure significantly.
Solution Approach 2:
The protocol uses unique identifier markers (analogous to color coding) in data packets to distinguish transmissions from different satellites. Each satellite is assigned a unique ID that acts as a signature in its communications, allowing ground stations to identify and separate signals from individual satellites within overlapping contact regions while maintaining straightforward protocol implementation.
3Quantity of substance
If sensor data for a particular region spreads across multiple satellites, then data coverage is improved, but coordinating data retrieval becomes much more complex under existing systems
Solution Approach 1:
The patent merges data packets from multiple source satellites at the clusterhead satellite before relaying to ground stations. This combining approach maintains comprehensive data coverage from multiple satellites while simplifying coordination by consolidating retrieval operations through the single clusterhead interface. The clusterhead aggregates data from its cluster members, reducing the coordination complexity from multiple satellite-ground links to a single managed connection.
4Ease of manufacture
If reduced power budgets are used in cubesats, then cost and size are reduced, but transmission bandwidth is limited
Solution Approach 1:
The patent transitions from direct satellite-to-ground transmission to a two-hop transmission path (satellite-to-clusterhead-to-ground). This dimensional change in communication architecture allows cubesats with reduced power budgets to transmit data to nearby clusterhead satellites using lower power and smaller antennas, while the clusterhead with greater transmission capability handles the longer-range link to ground stations, effectively overcoming the bandwidth limitation without increasing cubesat size or cost.
Data Source
AI summary
A cubesat communication system implementing addressable data packet for transmitting information collected by the cubesat to one or more receive-only ground stations. The cubesat may transmit information to the receive-only ground stations according to a scheduler. The receive-only ground stations may receive information from the cubesat without sending any commands to the cubesat to prompt transmission and re-transmit to a central common station using a bent pipe streaming protocol. Information between the cubesat and the ground station may be transmitted via a connectionless, datagram network protocol.