Antenna Orientation Control via Sum-Difference RSSI Tracking
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Solution Overview
Problem
There is a need for a system and method to accurately monitor, test, and adjust the alignment of antenna assemblies on vehicles, such as airplanes, relative to remote sources of radiofrequency radiation to maintain precise pointing error within regulatory limits, preventing service disruptions due to motion-induced misalignment.
Innovation Solution
A method and system utilizing a sum-difference structure and RSSI circuit to generate measures of off-bore-sight angles, allowing for radiofrequency steering instructions to be sent to an antenna motion controller, ensuring accurate alignment and minimizing pointing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the antenna assembly is affixed to a moving vehicle, then the antenna can provide communication services during transit, but the antenna alignment drifts due to vehicle motion causing pointing error to exceed regulatory limits
Solution Approach 1:
The system continuously monitors the actual orientation of the antenna assembly using inertial sensors and compares it with the desired orientation relative to the satellite. This feedback loop enables real-time detection of alignment drift and triggers corrective actions to maintain pointing accuracy within regulatory limits throughout vehicle motion.
Solution Approach 2:
The antenna assembly is mounted on a dynamic positioning system that can actively adjust its orientation in real-time. The system transitions from a static fixed mounting to a dynamically adjustable configuration, allowing the antenna to track the satellite despite vehicle motion and maintain optimal alignment.
2Measurement precision
If the antenna assembly is made adjustable to maintain alignment, then pointing precision can be maintained, but the system complexity increases
Solution Approach 1:
The system replaces complex mechanical alignment mechanisms with an electronic control system that uses inertial sensors, processors, and actuators. Instead of purely mechanical adjustment devices, the solution employs electronic sensing and control to achieve precise alignment, reducing mechanical complexity while maintaining or improving precision.
Solution Approach 2:
The antenna assembly integrates multiple functions into a single system: signal reception, orientation sensing via inertial sensors, alignment calculation through processing, and positional adjustment. This multi-functional integration reduces the need for separate dedicated alignment devices and simplifies the overall system architecture.
3Device complexity
If the antenna alignment is not continuously monitored and adjusted, then the system remains simple, but transmission must be halted when pointing error exceeds limits causing service disruption
Solution Approach 1:
The system performs preliminary alignment adjustments continuously during operation based on predicted vehicle motion from inertial sensors. By proactively adjusting the antenna position before significant misalignment occurs, the system prevents transmission halts rather than reacting after errors exceed limits, ensuring continuous service availability.
Solution Approach 2:
The continuous monitoring system provides real-time feedback on antenna alignment status, enabling the control system to make timely adjustments. This feedback mechanism ensures that pointing errors are corrected before they exceed regulatory thresholds, maintaining reliable continuous service without requiring complex predictive algorithms.
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 effectively maintains antenna alignment within the required 0.2° precision, preventing transmission halts and ensuring continuous service by dynamically adjusting the antenna array's orientation relative to the remote radiofrequency source.
Implementation Method 1
the first antenna portion is configured to couple to radiofrequency radiation transmitted from a transmitting radiofrequency signal source and provide a first signal output, and where the second antenna portion is configured to couple to radiofrequency radiation transmitted from the transmitting radiofrequency signal source
Data Source
AI summary
Systems and methods for tracking a remote source and monitoring and controlling the angular orientation of an antenna array, including a first antenna portion and a second antenna portion, are provided, including a sum-difference structure coupled to a first output of the first antenna portion and a second output of the second antenna portion, where the sum-difference structure provides both a sum power signal and a difference power signal, and where both the sum power signal and the difference power signal have associated RSSI values generated by an RSSI circuit. Systems and methods provided herein further include a sum-delta processor configured to utilize the RSSI values to generate an off-bore-sight angle of the antenna array relative to a position of a transmitting radiofrequency signal source.