Antenna Reflector Actuator Control for Surface Error Reduction
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Solution Overview
Problem
In satellite communication systems, the surface error of large antenna reflectors used for high-frequency signal transmission and reception is exacerbated by gravitational forces and limited mass, leading to reduced performance and increased data transmission errors.
Innovation Solution
A backing structure with a plurality of actuators is employed to exert forces on the reflector, reducing surface errors by dynamically adjusting the reflector's shape based on elevation angles, using influence functions and sensor data to optimize actuator positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the mass of the antenna reflector is reduced to facilitate positioning, then the reflector becomes more susceptible to gravitational deformation and surface error increases, but reducing mass is necessary for easier positioning and tracking
Solution Approach 1:
The patent applies active surface control by dynamically adjusting the reflector surface shape in real-time to compensate for gravitational deformation. Sensors detect surface deviations and actuators adjust the surface geometry dynamically, allowing the system to maintain precision despite using lightweight materials that would otherwise be too flexible.
Solution Approach 2:
The system implements a closed-loop feedback mechanism where sensors continuously monitor the reflector surface position and shape, compare it against the desired geometry, and send correction signals to actuators. This feedback loop enables the lightweight reflector to maintain surface accuracy by actively compensating for deformations caused by its own weight and external forces.
2Ease of operation
If the reflector surface is made more flexible to reduce weight, then positioning becomes easier, but surface error increases under gravitational forces
Solution Approach 1:
The reflector surface is designed with controlled flexibility that allows it to be easily positioned and reconfigured, while the active control system dynamically adjusts the surface shape to maintain precision. The surface can flex for positioning but is actively corrected during operation to compensate for gravitational deformation.
Solution Approach 2:
The system changes the physical state of the reflector surface by using actuators to adjust local surface geometry in real-time. This allows the surface to transition from a rigid, gravity-prone structure to an actively controlled surface that maintains its shape despite flexibility and gravitational forces.
3Manufacturing precision
If actuators are added to reduce surface error, then surface accuracy improves, but device complexity increases
Solution Approach 1:
The backing structure is divided into multiple independent segments or zones, each with its own actuators. This segmentation allows localized surface adjustment without requiring complex global control mechanisms. Each segment can be independently controlled to correct surface errors in specific areas, reducing overall system complexity.
Solution Approach 2:
The actuators in the backing structure are designed to perform multiple functions: they not only correct surface errors but also contribute to the overall structural support and positioning of the reflector. This multi-functionality reduces the need for separate components, thereby reducing device complexity while maintaining surface accuracy.
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 solution enhances the precision of signal transmission and reception, minimizing data transmission errors and maintaining performance across varying elevation angles, even with lightweight reflectors.
Implementation Method 1
A backing structure with a plurality of actuators is employed to exert forces on the reflector, reducing surface errors by dynamically adjusting the reflector's shape
Data Source
AI summary
The disclosed method may include (1) determining a current physical state regarding an antenna assembly that includes (a) a sub-reflector that receives a wireless signal and reflects the wireless signal to a feed structure for processing, (b) a continuous antenna reflector that receives the wireless signal at a reflecting surface that reflects the wireless signal to the sub-reflector, where the current physical state is indicative of a current surface error over the reflecting surface relative to the sub-reflector, and (c) a backing structure coupled to a back surface of the continuous antenna reflector opposite the reflecting surface and having a plurality of actuators distributed over, and coupled to, the back surface, (2) operating each of the plurality actuators in a manner that reduces the current surface error based on the current physical state. Various other methods and systems are also disclosed.