Satellite Space-to-Space Data Relay for Timely Downlink
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Solution Overview
Problem
Current Earth observation satellite systems face delays in providing up-to-date surveillance information due to the time required to downlink data from satellites to ground stations, which limits the timeliness of data delivery for applications requiring recent information.
Innovation Solution
The implementation of a space-to-space link to transmit Earth observation echo data from a low Earth orbit satellite to another satellite in a higher orbit, allowing for faster data delivery to ground stations by bypassing direct downlink delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If Earth observation data is downlinked directly from low Earth orbit satellite to ground station, then the data transmission path is simple, but the time required to deliver data exceeds acceptable thresholds for real-time surveillance applications
Solution Approach 1:
A geostationary relay satellite is introduced as an intermediary to receive data from the LEO observation satellite and forward it to ground stations. This mediator enables near-real-time data delivery by providing continuous communication coverage, resolving the time loss issue while maintaining manageable system complexity through a standardized relay architecture.
Solution Approach 2:
The communication architecture transitions from a two-dimensional ground-based network to a three-dimensional space-based relay system. By utilizing the vertical dimension of space with a geostationary satellite at approximately 36,000 km altitude, the system achieves continuous line-of-sight coverage and reduces data delivery time without proportionally increasing complexity.
2Reliability
If the satellite waits for optimal ground station visibility to downlink data, then direct communication is maintained, but the data becomes outdated for time-sensitive surveillance applications
Solution Approach 1:
The geostationary relay satellite serves as a continuous communication intermediary that eliminates the need for the LEO satellite to wait for ground station visibility. Data can be transmitted immediately to the relay satellite, which maintains constant position and communication capability, thereby ensuring both data freshness and reliability for surveillance applications.
Solution Approach 2:
The relay satellite is pre-positioned in geostationary orbit to provide continuous coverage before data needs to be transmitted. This preliminary positioning allows the LEO satellite to upload data at any point in its orbit without waiting for specific ground station passes, significantly reducing surveillance response time while maintaining reliable data delivery.
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 significantly reduces the time it takes to deliver Earth observation data from satellites to users, enabling near-real-time data availability and improving the responsiveness of surveillance applications.
Implementation Method 1
transmit the predetermined data to another satellite in orbit above Earth using space-to-space radio communication
Data Source
AI summary
A method of providing Earth observation data comprises: acquiring Earth observation echo data on a first satellite in a low Earth orbit, determining a time required to downlink predetermined data to a ground station on Earth from the first satellite at the current position of the first satellite. If the time required exceeds a predetermined threshold, the predetermined data may be transmitted to another satellite in orbit above Earth using space-to-space radio communication. Alternatively, the first satellite may receive data relating to the current position of another satellite in orbit above Earth, determine a time required to the predetermined data to a ground station via the other satellite at the current position of the at least one other satellite, and if the determined time for the other satellite is less than the time determined for the first satellite, transmit the predetermined data to the other satellite in orbit above Earth using space-to-space radio communication.In some possible implementations, the echo data may be processed on-board the first satellite to generate an image and analysed to determine a portion of interest. Then the predetermined data may comprise a data structure comprising a location of the portion of interest which may be transmitted using the space-to-space link.