Triaxial Antenna 3D Polarization Control
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Solution Overview
Problem
Conventional GPS antennas suffer from axial ratio limitations, leading to degraded performance in jammer rejection and spoofing detection, especially when scanning off-boresight, and are unable to accurately control polarization in three-dimensional space due to axial ratio degradation and inefficient use of array elements.
Innovation Solution
The implementation of triaxial antennas with orthogonal linearly polarized elements and complex weights applied to control polarization in three-dimensional space, enabling directional polarization control and nulling, which allows for robust jammer rejection and spoofer detection without physical movement of the antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional planar antenna arrays are used with zenith-pointing circular polarized elements, then the axial ratio is optimized in the boresight direction, but the axial ratio degrades as the scan angle increases from boresight
Solution Approach 1:
The patent transitions from conventional two-dimensional planar antenna arrays to three-dimensional volumetric arrays. This dimensional expansion enables the antenna system to maintain accurate polarization control in all directions of 3D space, not just in the boresight direction. The volumetric arrangement of antenna elements provides additional spatial degrees of freedom for beamforming and polarization management.
Solution Approach 2:
The patent implements electronically steerable and reconfigurable antenna beams with dynamic polarization control. By using phased array technology with programmable weightings and phase shifts, the system can adaptively adjust beam direction and polarization characteristics in real-time without mechanical movement, maintaining optimal axial ratio across varying scan angles.
2Device complexity
If conventional 2D antenna arrays are used, then the system structure is simpler, but the ability to determine direction of arrival and characterize polarization is limited
Solution Approach 1:
The patent employs three-dimensional volumetric antenna arrays instead of conventional two-dimensional planar arrays. This volumetric configuration provides enhanced spatial sampling capability, enabling more accurate determination of direction of arrival (DOA) through spherical coordinate analysis and improved polarization characterization through multi-directional element responses.
Solution Approach 2:
The patent divides the antenna system into multiple spatially distributed elements arranged in a volumetric pattern. Each element contributes to the overall measurement capability, and the segmented structure allows for independent weighting and processing of signals from different spatial locations, enhancing both DOA estimation and polarization analysis.
3Adaptability or versatility
If sphere-covering antenna elements are used to achieve 3D polarization control, then polarization can be controlled in all directions, but the use of array elements becomes inefficient as elements on only one side of the sphere are in play at any given time
Solution Approach 1:
The patent uses dynamically reconfigurable phased array processing to electronically steer beams and activate only the necessary subset of array elements for each observation direction. This dynamic element selection and weighting approach ensures that all elements in the volumetric array contribute to the overall system capability while maintaining high utilization efficiency by engaging the optimal elements for each specific spatial direction.
Solution Approach 2:
The patent designs the volumetric antenna array with multi-functional capability where each element can contribute to multiple functions depending on the operational requirements. The same array elements used for primary beamforming can also be utilized for polarization calibration, direction finding, and interference rejection, maximizing the productivity and versatility of the array system.
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 solution provides robustness against multipath, jamming, and spoofing while minimizing system size, weight, and power consumption, enabling 3D resolution of polarization and direction of arrival, and supporting spatial modulation for improved navigation systems.
Implementation Method 1
orthogonal x, y, and z linearly polarized elements to convert received radio frequency (RF) energy to x, y, and z RF signals
Data Source
AI summary
An apparatus comprises: a polarization generator to receive first and second signals, apply to the first and second signals two-dimensional (2D) complex weights to produce 2D weighted complex signals that represent a polarization having a plane of polarization referenced to three-dimensional (3D) orthogonal axes, operate on the 2D weighted complex signals to rotate the plane of polarization angularly with respect to the 3D orthogonal axes, and produce 3D controlled complex signals representing the polarization with the rotated plane of polarization; quadrature upconverter-modulators to modulate the 3D controlled complex signals, to produce 3D modulated radio frequency (RF) signals; and a triaxial antenna including orthogonal 3D linearly polarized elements to receive respective ones of the 3D modulated RF signals and collectively convert the 3D modulated RF signals to radiant RF energy that has the polarization with the rotated plane of polarization.