Spacecraft Antenna Pointing With Closed-Loop Signal Feedback
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Solution Overview
Problem
The orientation changes of a space vehicle antenna relative to a ground antenna due to motor inconsistencies or inaccuracies disrupt or weaken signal transmission and receipt, and lack of autonomous tracking capabilities in space vehicle antennas creates an open loop, requiring resource-intensive human intervention.
Innovation Solution
A closed control loop system is established using telemetry data analysis and signal strength measurements to autonomously adjust the pointing angle of space vehicle antennas, aligning boresights with ground antennas to maintain signal alignment and maximize power reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If autonomous tracking capabilities are added to space vehicle antennas, then alignment precision with ground antennas is improved, but device complexity increases
Solution Approach 1:
The patent implements a closed-loop feedback system where signal strength measurements from ground antennas are continuously monitored and fed back to adjust the space vehicle antenna pointing angle. This feedback mechanism enables autonomous tracking without requiring complex onboard tracking hardware, as the system uses simple signal strength measurements to drive alignment corrections.
Solution Approach 2:
The system enables the space vehicle antenna to autonomously align itself with ground antennas by using the received signal strength as a self-diagnostic metric. The antenna pointing control circuitry automatically adjusts the antenna orientation based on signal strength feedback, eliminating the need for external intervention or complex autonomous tracking capabilities.
2Measurement precision
If motor precision is improved to maintain antenna orientation, then alignment precision is improved, but device complexity and cost increase
Solution Approach 1:
Instead of relying on high-precision motors to maintain antenna orientation, the patent uses a feedback control system that continuously measures signal strength and adjusts the antenna pointing angle accordingly. This approach trades motor precision for a simpler control system that actively compensates for orientation drift through closed-loop control.
Solution Approach 2:
The patent replaces the need for high-precision mechanical motor systems with an electronic control system that uses signal strength measurements to drive antenna adjustment. This substitution reduces mechanical complexity by relying on electronic feedback and control rather than precision mechanical components.
3Measurement precision
If human intervention is used to detect and correct alignment issues, then alignment precision can be maintained, but productivity decreases due to resource consumption
Solution Approach 1:
The system automatically detects and corrects alignment issues by using signal strength measurements as a self-diagnostic tool. The antenna pointing control circuitry continuously monitors signal quality and autonomously adjusts the antenna orientation without requiring human operators to detect or correct alignment problems, thereby eliminating resource consumption associated with manual intervention.
Solution Approach 2:
The closed-loop feedback system continuously monitors signal strength and automatically triggers alignment corrections when degradation is detected. This automated feedback mechanism eliminates the need for human operators to manually monitor and correct alignment issues, improving productivity by reducing resource consumption while maintaining alignment precision.
4Productivity
If closed control loop system is implemented for autonomous antenna alignment, then productivity is improved by reducing human intervention, but device complexity increases
Solution Approach 1:
The patent implements a closed-loop feedback system that uses signal strength measurements to automatically control antenna pointing angle. This feedback mechanism enables autonomous operation that improves productivity by eliminating human intervention, while the complexity is managed by using simple signal strength metrics rather than complex sensing and control algorithms.
Solution Approach 2:
The system uses the existing signal reception function of the antenna for dual purposes: both for data communication and for alignment feedback. The same antenna that receives data signals also provides the signal strength feedback needed for autonomous alignment, eliminating the need for separate sensing hardware and reducing overall system complexity.
Data Source
AI summary
Antenna pointing systems and related methods are disclosed. An example apparatus includes memory; machine-readable instructions; and at least one processor circuit to be programmed by the machine-readable instructions to identify a transmission status of an antenna of a space vehicle based on telemetry data received from the space vehicle via a first ground antenna; identify a first signal strength value associated with first signals received at a second ground antenna, the first signals transmitted by the antenna of the space vehicle when a beam of the antenna of the space vehicle is at a first pointing angle; responsive to the transmission status and the first signal strength value, determine a pointing angle adjustment step to adjust the first pointing angle relative to the second ground antenna; and cause the first pointing angle to be adjusted to a second pointing angle based on the pointing angle adjustment step.