Pop-up Retroreflector with Load-Biased Hinges for On-Demand Deployment
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Solution Overview
Problem
Current methods for studying the thermosphere's characteristics, such as those deployed by NASA, are expensive and limited in their ability to provide real-time or on-demand measurements, especially during solar events like CMEs, due to the difficulty in quickly responding to and measuring changes in the thermosphere.
Innovation Solution
The development of pop-up retroreflectors with load-biased hinges that can be deployed on-demand by CubeSats, using shape memory alloys or metals to unfold and deploy from a compact state, allowing for real-time measurement of thermospheric characteristics through radio frequency signal reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional reflective spheres are deployed from space shuttle, then measurement of thermosphere characteristics can be obtained, but the cost is very high and the response time is limited
Solution Approach 1:
The retroreflector is divided into multiple blade elements (focal blade and pivotable blades) that can be independently deployed. This segmentation allows the structure to transition from a compact stowed configuration to an expanded operational configuration, reducing the complexity of handling large reflective surfaces during deployment while maintaining measurement capability.
Solution Approach 2:
The retroreflector blades are designed to nest within each other during stowed configuration, with smaller blade portions fitting within larger ones. This nesting arrangement minimizes the volume required for storage and transport, thereby reducing deployment complexity while preserving the full measurement capability when deployed.
2Measurement precision
If more retroreflectors are deployed to increase sampling locations, then measurement coverage improves, but the cost increases significantly
Solution Approach 1:
The retroreflector design enables changes in structural parameters (area, orientation, position) through blade deployment and adjustment mechanisms. This allows a single retroreflector to provide multiple measurement configurations, effectively increasing sampling coverage without proportionally increasing the number of retroreflectors deployed.
3Ease of operation
If space shuttle is used for deployment, then retroreflectors can be released, but the release window is very time limited and responsive mission is difficult
Solution Approach 1:
The retroreflector incorporates dynamic blade elements that can be deployed and adjusted after release from the dispenser. This dynamic capability allows the structure to adapt to different operational requirements and extend the effective mission window beyond the initial release timing, enabling more flexible scheduling.
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
Enables cost-effective, on-demand deployment of retroreflectors in the thermosphere for real-time measurement of orbital decay and space weather effects, improving understanding of satellite orbits and thermospheric dynamics.
Implementation Method 1
The load-biased hinge can be made of shape memory metal and/or alloy such as nitinol (i.e., a nickel-titanium alloy). Alternatively, the load-biased hinge can be a flat-elastic metal portion.
Implementation Method 2
A hinge can be created by folding the flat-elastic metal portion to a folded position. This creates distortion and potential energy to be stored in the flat-elastic metal portion.
Implementation Method 3
Disclosed are embodiments of pop-up retroreflectors and load-biased hinges for use with the pop-up retroreflectors.
Implementation Method 4
allowing for real-time measurement of thermospheric characteristics through radio frequency signal reflection
Data Source
AI summary
Many in the space weather community consider our understanding of the buoyancy of the thermosphere and its effects on the orbits of satellites in Low Earth Orbit (LEO) to be insufficient during short time frames. Disclosed herein is an approach for making on-demand thermosphere buoyancy measurements using a deployable low mass retroreflector with CubeSat-like dimensions. A CubeSat storing many retroreflectors can dispense one or more of these passive satellites according to a predetermined schedule or on-command, in response to an observed space weather phenomenon like a coronal mass ejection. With measurements of the orbit decay from these passive satellites, a better understanding of the relationship between space weather and orbital decay can be established with relatively low cost.