Phased Array Antenna In-Line Calibration for Signal Integrity
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Solution Overview
Problem
Phased array antennas in satellite communication systems face performance variations due to weather and environmental conditions, affecting gain, phase, and delay characteristics, necessitating effective calibration methods to maintain signal integrity.
Innovation Solution
A calibration method for phased array antennas involving RF signal transmission and reception through calibration lines to compare and adjust signal chains based on determined characteristics, utilizing calibration transmit and receive sections to calibrate antenna elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phased array antennas are exposed to weather and environmental conditions, then satellite communication functionality is maintained, but performance characteristics (gain, phase, delay) vary and signal integrity deteriorates
Solution Approach 1:
The patent performs calibration measurements before actual satellite communication operations to establish baseline performance characteristics. By pre-characterizing the antenna elements and signal chains under various environmental conditions, the system can compensate for environmental effects during normal operation, maintaining signal integrity despite weather variations.
Solution Approach 2:
The calibration system uses measured performance characteristics to generate correction data that feeds back into the signal processing chain. This feedback mechanism allows real-time compensation for environmental variations by adjusting phase and amplitude parameters based on previously measured deviations, thereby maintaining consistent signal integrity across changing conditions.
2Reliability
If calibration procedures are performed to compensate for performance variations, then signal integrity is maintained, but system complexity and calibration time increase
Solution Approach 1:
The calibration system is designed to be self-contained, using the antenna elements themselves and integrated signal chains to perform calibration measurements without requiring external reference equipment. The system calibrates itself by measuring through the same hardware paths used for actual communication, eliminating the need for separate calibration hardware and reducing overall system complexity.
Solution Approach 2:
The signal chains serve dual purposes: they are used both for normal satellite communication signal processing and for calibration measurements. The same RF paths, phase shifters, and amplifiers that handle operational signals are also utilized for calibration, allowing the system to maintain signal integrity without adding dedicated calibration hardware, thus avoiding increased complexity.
3Measurement precision
If traditional calibration methods using external references are used, then calibration accuracy may be achieved, but portability and ease of operation are reduced
Solution Approach 1:
The system performs calibration using its own internal signal chains and antenna elements without requiring external reference equipment. By generating calibration signals internally and measuring them through the same hardware paths used for communication, the system achieves adequate calibration accuracy while maintaining portability and ease of operation in field deployments.
Solution Approach 2:
The patent extracts the calibration functionality from external reference equipment and integrates it directly into the antenna system itself. By removing the dependency on external calibration instruments, the system becomes self-sufficient, portable, and easier to operate in various field conditions while maintaining sufficient calibration accuracy for practical applications.
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
Enhances signal-to-interference and noise ratio (SINR) by calibrating signal chains, maintaining consistent performance despite environmental changes, and improving beamforming accuracy without external references.
Implementation Method 1
transmitting a first RF signal to a first signal chain associated with a first antenna element... transmitting a second RF signal to a second signal chain associated with a second antenna element
Data Source
AI summary
A phased array antenna system can include a calibration line oriented along an orientation axis having a first distal end and a second distal end each radio frequency (RF) couplable to a transmitter, a receiver, or a termination, the calibration line including a plurality of calibration line coupling sections equally spaced from one or more adjacent calibration line coupling sections by a spacing distance and arranged along the orientation axis and a plurality of antennas associated with the calibration line each antenna of the plurality of antennas is associated with a respective antenna coupling section and a respective antenna signal chain. The respective antenna coupling sections are equally spaced by the spacing distance from one or more adjacent antenna coupling sections and arranged along the orientation axis. Each calibration line coupling section is configured to couple to at least one corresponding antenna coupling section.