DF Antenna Array Calibration Using Fixture Measurements and CEM
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Solution Overview
Problem
Calibrating direction finding (DF) antenna arrays is costly and time-consuming, especially for complex platforms like aircraft and ships, due to the need for extensive measurement and alignment procedures, which can be inefficient and prone to measurement errors.
Innovation Solution
The use of fixture antenna range measurements combined with computer electromagnetic modeling (CEM) to calibrate antennas, allowing for the measurement of nuances in antenna design and construction without requiring the antennas to be installed on the platform, thereby reducing costs and schedule burdens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional platform calibration methods are used to calibrate DF antenna arrays, then measurement accuracy can be achieved, but the process becomes extremely costly and time-consuming
Solution Approach 1:
The patent creates a virtual copy of the physical platform through detailed 3D computer electromagnetic modeling. This digital twin replicates the platform's geometric structure, material properties, and antenna configurations, allowing calibration calculations to be performed in the virtual model rather than requiring extensive physical measurements. The CEM software simulates electromagnetic wave propagation and antenna responses as if the actual platform were being calibrated, significantly reducing time and cost while maintaining accuracy.
Solution Approach 2:
The patent replaces the mechanical/physical calibration process with computational electromagnetic modeling. Instead of physically moving antennas, setting up measurement equipment, and performing field tests on the actual platform, the solution uses software-based CEM to calculate antenna patterns and calibration parameters. This substitution eliminates the need for complex physical test setups and lengthy measurement campaigns while providing comparable or superior calibration accuracy.
2Reliability
If traditional platform calibration methods are used to calibrate DF antenna arrays, then calibration can be performed, but the cost and schedule burdens become prohibitive
Solution Approach 1:
The patent creates a virtual copy of the physical platform through detailed 3D computer electromagnetic modeling. This digital twin replicates the platform's geometric structure, material properties, and antenna configurations, allowing calibration calculations to be performed in the virtual model rather than requiring extensive physical measurements. The CEM software simulates electromagnetic wave propagation and antenna responses as if the actual platform were being calibrated, significantly reducing time and cost while maintaining accuracy.
Solution Approach 2:
The patent extracts the essential calibration functionality from the complex physical calibration system and isolates it into a standalone software-based CEM approach. By separating the calibration calculations from the physical platform and measurement equipment, the solution eliminates the need for complex test fixtures, specialized measurement equipment, and coordinated physical operations. The extraction of calibration capability into pure computation simplifies the overall system while maintaining reliability.
3Measurement precision
If fixture antenna range measurements are used with CEM, then calibration accuracy is improved by accounting for antenna nuances, but the method requires detailed antenna design information
Solution Approach 1:
The patent performs preliminary measurements of antenna nuances during the fixture antenna range testing phase, before the full platform calibration process. By characterizing antenna properties (such as radiation patterns, impedance, and coupling effects) in the controlled fixture environment first, the solution captures these nuances upfront and incorporates them into the CEM model. This preliminary characterization eliminates the need to repeatedly measure or estimate these parameters during the more complex platform-level calibration, reducing overall modeling complexity while improving accuracy.
Solution Approach 2:
The patent segments the calibration process into distinct phases: first measuring antenna properties in isolation during fixture testing, then incorporating those measurements into the platform-level CEM model. This segmentation allows the complex problem of platform calibration to be broken down into manageable components - antenna characterization followed by system-level simulation. Each segment can be optimized independently, reducing the overall complexity of the complete calibration process.
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 approach enables accurate and efficient calibration of DF antenna arrays by accounting for antenna nuances in a simple and fast manner, reducing the need for complex test fixtures and extensive platform calibration, resulting in improved accuracy and significant cost savings.
Implementation Method 1
predicting, via a computer electromagnetic model (CEM), a predicted antenna response voltage of the at least one antenna installed on the test fixture
Implementation Method 2
measuring actual antenna response voltages of the at least one antenna installed on the test fixture
Data Source
AI summary
An antenna calibration system and method utilizes both computer electromagnetic modeling and actual test fixture measurements for calibrating the antenna or multiple antennas in an array. Use of the test fixture measurements enables the calibration technique to account for design nuances or imperfections in each respective antenna to enable that particular antenna to be more accurately modeled for calibration without having to physically maneuver the platform to calibrate the antenna that is to be installed thereon. Use of computer electromagnetic modeling techniques then account for these design nuances or imperfections to provide improved modeling for calibrating the antenna on a platform prior to moving the platform with the antennas on the platform.