In-orbit Phased Array Antenna Calibration via Embedded Probes
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Solution Overview
Problem
Conventional calibration techniques for phased array antennas face challenges in achieving both accuracy and speed, particularly in-orbit, due to manufacturing errors, temperature variations, and dynamic changes, which affect beam forming and require regular corrections.
Innovation Solution
The implementation of embedded calibration probes within the phased array antenna for in-orbit calibration, using a multi-tone waveform to adjust phase, gain, or time-delay parameters, and distinguishing between static and dynamic offsets for one-time, open-loop, and closed-loop calibrations to manage geometric and electrical irregularities and temperature-related changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional calibration techniques are used for phased array antennas, then manufacturing errors can be corrected, but calibration speed and accuracy deteriorate due to temperature variations and dynamic changes
Solution Approach 1:
The patent applies preliminary action by performing a one-time calibration during manufacturing to establish baseline correction values for manufacturing errors. This preliminary calibration stores reference data that enables faster operational calibrations later, resolving the contradiction by separating static manufacturing error correction from dynamic operational adjustments.
Solution Approach 2:
The patent implements dynamics by introducing multiple calibration modes (one-time, open-loop, and closed-loop) that adapt to different operational conditions. The system dynamically selects calibration approaches based on whether temperature variations or other dynamic changes are present, enabling both accuracy and speed by matching the calibration method to the specific situation.
2Reliability
If regular calibration corrections are performed to account for temperature variations and dynamic changes, then beam forming accuracy is maintained, but calibration complexity and time consumption increase
Solution Approach 1:
The patent segments the calibration process into distinct types: one-time calibration for manufacturing errors, open-loop calibration for predictable temperature variations using pre-stored data, and closed-loop calibration for unexpected dynamic changes using real-time measurements. This segmentation reduces overall complexity by allowing each segment to be optimized independently for its specific purpose.
Solution Approach 2:
The patent employs feedback mechanisms in closed-loop calibration where real-time measurements of actual beam patterns are compared against expected patterns, and correction values are adjusted based on the measured deviations. This feedback approach maintains reliability by continuously adapting to dynamic changes while keeping complexity manageable through automated adjustment.
3Adaptability or versatility
If multiple calibration types are implemented to handle different error sources, then comprehensive error correction is achieved, but system complexity and operational difficulty increase
Solution Approach 1:
The patent creates a universal calibration system where a single phased array antenna structure supports multiple calibration types (one-time, open-loop, closed-loop) through integrated hardware components. The same antenna elements and control systems are used across all calibration modes, achieving comprehensive error correction without proportionally increasing operational difficulty through standardized procedures.
Data Source
AI summary
Technologies directed to calibrating phased array antennas are described. A processing device of a communication device causes a first radio to send a first signal via a first antenna element. The first signal has a set of tones. Each tone of the set of tones has a frequency within a fixed frequency range. The processing device causes a second radio to receive a second signal via a second antenna element. The second signal is a response to the first signal. The processing device determines that there is a difference between the second signal and a reference signal. The processing device adjusts at least one of a phase parameter value, a gain parameter value, or a time-delay parameter value of a radio frequency component based on the difference.