Antenna Array Phase Correction via Radiometric Feedback
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Solution Overview
Problem
Conventional multi-element antenna arrays face challenges in correcting transmission phasing errors due to objects in the transmission medium and inaccuracies in antenna element locations, leading to reduced signal strength and formation of nulls, especially when antenna elements are spread over large distances, and existing long loop methods are time-consuming and limited by latency and availability issues.
Innovation Solution
The system computes phase corrections for transmitted signals based on received signals from radiometric sources, determining differential distances and fractional wavelength values to adjust the phase of antenna elements, allowing for real-time correction of phasing errors without requiring reference objects in the direction of interest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional beamforming techniques are used with large antenna arrays, then signal directionality is improved, but transmission phasing errors increase due to objects in the transmission medium and inaccuracies in antenna element locations
Solution Approach 1:
The system receives test signals at each antenna element, processes these signals to determine actual phase propagation values, and uses this feedback to update configuration data for phase correction. This closed-loop feedback mechanism compensates for phasing errors caused by transmission medium objects and location inaccuracies, maintaining reliable phase accuracy while preserving signal directionality.
Solution Approach 2:
The system dynamically adjusts phase propagation parameters by comparing estimated phase propagation (based on configuration data) with actual phase propagation (measured from received signals). It updates configuration data with corrected phase values, enabling adaptation to changing transmission conditions and compensation for phasing errors without sacrificing directional performance.
2Reliability
If long loop methods are used to correct phasing errors, then phase accuracy is improved, but latency and availability issues increase
Solution Approach 1:
The system performs preliminary phase measurement by receiving test signals and determining actual phase propagation values before main transmission operations. Configuration data is pre-updated with corrected phase information, enabling rapid phase correction without requiring time-consuming long loop feedback during critical transmission periods, thus reducing latency while maintaining accuracy.
Solution Approach 2:
The system rushes through the phase correction process by using received signals to directly compute phase propagation values and update configuration data in real-time or near-real-time. This eliminates the need for lengthy iterative adjustments characteristic of conventional long loop methods, significantly reducing correction latency while achieving the required phase accuracy.
3Area of stationary object
If antenna elements are spread over large distances to improve coverage, then area coverage is improved, but phase synchronization becomes more difficult
Solution Approach 1:
The system uses feedback from received test signals to measure actual phase propagation at each antenna element regardless of its position in the large array. This measured feedback is used to compute and apply position-specific phase corrections, enabling accurate phase synchronization across widely spaced antenna elements that would otherwise be difficult to align due to their large separations.
Solution Approach 2:
The system applies local phase correction to each antenna element based on its specific position and measured phase propagation characteristics. Rather than using a uniform correction approach, it tailors the phase adjustment to local conditions at each element, enabling precise phase alignment across the entire large-area array by addressing each element's unique phase requirements.
Data Source
AI summary
A method for correcting transmission phasing errors in an plurality of antenna elements is provided. The method includes receiving at least a first signal having a first frequency at the plurality of antenna elements at an angle of arrival (AOA). The method also includes identifying an actual fractional wavelength value (ftrue) for the first signal received with respect to a reference location for at least one of the plurality of antenna elements, obtaining a estimated phase propagation of the first signal at the one of the plurality of antenna elements relative to the reference location based at least on configuration data for plurality of antenna elements, and updating the configuration data associated with the AOA for the one of the plurality of antenna elements based on the estimated phase propagation and ftrue.