Nano-Satellite Pointing Stabilization via Movable Platform
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Solution Overview
Problem
Nano-satellites face challenges in achieving stable and precise pointing due to their small size and weight, which limits their communication capabilities, especially in optical communications, as existing solutions like FSM technology have limited range and are not suitable for high-frequency stability.
Innovation Solution
A stabilized pointing system with a movable supporting element connected by coupling elements, including a joint and extensible legs with variable length and damping elements, allowing for precise control and stabilization on unstable platforms like nano-satellites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional stabilization systems are used on nano-satellites, then pointing stability can be achieved, but the system weight and size increase significantly
Solution Approach 1:
The patent applies dynamics by making the supporting element movable relative to the satellite platform rather than fixed. The supporting element can dynamically adjust its position and orientation to compensate for platform instability, achieving stabilization through active movement rather than passive rigidity. This dynamic approach allows the system to maintain pointing stability while using lighter components compared to conventional fixed stabilization systems.
Solution Approach 2:
The system segments the stabilization function from the main satellite platform by introducing a separate movable supporting element. This supporting element carries the communication terminal and can move independently to compensate for platform instability. The coupling elements (extensible legs with joints) further segment the system into controllable modules, allowing independent optimization of each component for reduced weight while maintaining overall stability.
2Weight of moving object
If the pointing system is made more compact and lightweight, then weight and size are reduced, but pointing precision and stability deteriorate
Solution Approach 1:
The patent implements feedback control through the movable supporting element that continuously adjusts its position based on the relative motion between the satellite platform and the desired target. The coupling elements with multiple degrees of freedom provide the necessary control authority to counteract platform disturbances in real-time, maintaining pointing precision despite the compact and lightweight design. This active feedback mechanism compensates for the reduced inertia and stability inherent in lightweight structures.
Solution Approach 2:
The extensible legs incorporate damping elements that likely use composite material structures to provide both mechanical support and vibration damping in a compact form. These composite structures enable the lightweight design to achieve sufficient rigidity and damping characteristics for precise pointing, combining lightweight materials with damping properties in a single integrated component.
3Productivity
If optical communication terminals are installed on nano-satellites, then communication capacity increases, but the requirement for accurate pointing becomes more demanding
Solution Approach 1:
The movable supporting element acts as an intermediary between the unstable satellite platform and the optical communication terminal. It isolates the terminal from platform disturbances while providing active stabilization, enabling the terminal to maintain the high pointing accuracy required for optical communications without being directly mounted on the unstable platform. This intermediary structure decouples the terminal's pointing requirements from the platform's stability limitations.
4Speed
If Fast Steering Mirror (FSM) technology is used for stabilization, then pointing speed is improved, but the range and high-frequency stability are limited
Solution Approach 1:
The patent employs a dynamic movable supporting element with extensible legs that can adapt to a wide range of motion requirements, unlike the limited angular range of FSM mirrors. The supporting element can physically reposition to accommodate large pointing angles while maintaining stability, providing both high-speed response and broad adaptability. The multiple degrees of freedom in the coupling elements enable the system to handle both fast corrections and large-range positioning effectively.
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
The system achieves high precision and stability in pointing, reducing the weight and size while maintaining high communication speeds, suitable for nano-satellites with limited resources, and supports high bit-rate communications.
Implementation Method 1
each of said extensible legs (310, 320) also comprises one element for damping and attenuation of the extension or compression of said extensible leg
Data Source
AI summary
The preferred field of application of the present invention concerns the technology for the stabilization of the orientation of a pointing platform in small satellites as, for example, the so-called nano-satellites. In fact, the use of nano-satellites for low-cost space applications, requires that they have performances suitable to support a large number of possible new applications, in particular it is required that they can ensure adequate telecommunications capacity even with scarce power resources. Therefore, the availability of very precise pointing systems is essential in order to make communications as efficient as possible. Moreover, it should be noted that the nano-satellite platforms are also very unstable, and therefore such pointing, when acquired, must be continuously stabilized. Finally, the pointing and stabilization mechanisms must be light and compact in order to meet other typical constraints (weight and size, precisely) of space applications, but which may also be present in other areas of application. The mechanism specified in the present invention provides an adjustable support platform constrained to the satellite platform (or in general to an unstable platform) in one of its points by means of a joint with two or three degrees of freedom. The orientation and the stabilization of such orientable platform are then controlled by other constraints which consist in extensible legs with a controllable length. The mechanism, as a whole, provides a satisfactory solution to the problem of the stabilized pointing and allows, at the same time, to significantly reduce the weight and the overall dimensions.