Satellite Constellation Latency Reduction via Segmented Optical Crosslinks
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Solution Overview
Problem
Current satellite communication constellations face high latency and variability in latency due to long communication paths and inefficient coverage, which is inadequate for ultra-low latency applications like financial transactions and robotic surgery, and do not effectively utilize geographical and weather data to optimize communication pathways.
Innovation Solution
A satellite constellation system configured in multiple orbital planes with predetermined distances and altitudes, using a method to divide the communication path into smaller segments to approximate an optimal pathway that minimizes latency and maximizes bandwidth, with satellites maintaining fixed positions and orientations to avoid signal processing delays and interference, and data is forwarded based solely on geographic location information without analyzing content or metadata.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If GEO satellites are used to provide global coverage, then coverage area is improved, but latency increases to at least 120 ms per path
Solution Approach 1:
The patent segments the satellite constellation into multiple orbital layers (GEO, MEO, LEO) with different functions. GEO satellites provide coverage for non-time-critical traffic, MEO satellites handle regional traffic with moderate latency requirements, and LEO satellites provide low-latency paths for time-critical applications. This segmentation allows the system to optimize for both coverage area and latency by routing traffic through appropriate satellite layers.
2Loss of time
If LEO satellites are deployed in constellations to provide low latency, then latency is improved, but device complexity increases due to need for multiple satellites
Solution Approach 1:
The patent creates a multi-functional satellite constellation where satellites at different orbital levels serve multiple purposes. MEO satellites can serve as backup for GEO, LEO satellites provide both communication and positioning functions, and the entire constellation can dynamically reconfigure to serve different geographic regions and application types. This multi-functionality reduces the need for separate dedicated systems.
3Area of stationary object
If traditional satellite constellations maximize global coverage, then coverage is improved, but latency variability increases due to hand-offs between satellites in different orbits
Solution Approach 1:
The patent implements preliminary action by pre-establishing communication links and routing paths between satellites in different orbital planes before hand-off is needed. The system pre-synchronizes clocks and pre-configures relay paths so that when a satellite enters or exits a terminal's visibility zone, the hand-off to another satellite can occur seamlessly without recalculation delays. This is particularly important for maintaining consistent latency in multi-orbit constellations.
4Quantity of substance
If fiber optic cables are used for intercontinental communication, then bandwidth is improved, but latency is limited by speed of light through fiber
Solution Approach 1:
The patent uses satellites as intermediary nodes to bridge terrestrial communication gaps. Instead of relying solely on submarine cables that must travel through the Earth's crust, data can be uplinked to satellites in LEO or MEO orbit, transmitted through space at near-light speed, and downlinked to destinations on other continents. This intermediary space-based path reduces latency compared to purely terrestrial fiber routes while maintaining high bandwidth capability.
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 latency and variability in latency, enabling high-bandwidth, low-latency data transfers by optimizing communication pathways and maintaining continuous coverage, even in areas with varying geographical and weather conditions.
Implementation Method 1
Each satellite in the constellation may include a transceiver configured to receive signals from a remote terminal, convert the signals to optical signals, and transmit the optical signals to a neighboring satellite
Implementation Method 2
The first satellite and the second satellite may be coupled through an optical crosslink
Data Source
AI summary
Methods and systems for free space communication comprising one or more satellites that may provide a continuous communication link between two or more terminals are disclosed. A first satellite may be configured to send and/or receive data signals from a first terminal through a first link, and a second satellite may be configured to send and/or receive data from a second terminal through a second link. The first satellite and the second satellite may be coupled through a crosslink. The satellites and the terminals may be positioned at a minimum latitude threshold in order to take advantage of the decreasing circumference of the earth at increasing latitudes. The system and the method may comprise dividing the communication pathway between into a plurality of smaller segments, which when linked together approximate an optimal pathway for low latency and enable maintaining of higher bandwidth between the two terminals.