Antenna Array Phase Center Calibration via Differential Distance Vectors
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Solution Overview
Problem
Conventional multi-element antenna arrays face challenges in accurately determining phase center locations, leading to reduced signal strength and misalignment during beamforming, especially as array size increases and distance to the object of interest increases, due to limitations in system models and calibration data accuracy and environmental factors.
Innovation Solution
The method involves calculating differential distance vectors between antenna elements and a reference location based on signals arriving at various angles of arrival, allowing for the determination of actual phase center locations and providing corrections to configuration data to improve beamforming accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional beamforming techniques are used with antenna arrays, then signal transmission and reception can be enhanced, but phase center location accuracy deteriorates leading to misalignment and reduced signal strength
Solution Approach 1:
The patent replaces conventional mechanical/calibration-based phase center determination methods with an electromagnetic field-based calculation method. By using received signal data and differential distance vectors to compute phase center locations mathematically, the system achieves higher accuracy without physical measurement equipment or time-consuming calibration procedures.
Solution Approach 2:
The patent introduces differential distance vectors as an intermediary computational element that connects the known antenna element positions with the unknown phase center locations. These vectors serve as a mathematical bridge that enables the calculation of accurate phase centers by relating signal arrival angles to spatial relationships between antenna elements.
2Reliability
If the array dimensions and number of antenna elements are increased to improve beamforming performance, then signal directionality is enhanced, but the difficulty of properly coordinating components increases
Solution Approach 1:
The patent enables the antenna array system to self-calibrate by automatically calculating phase center locations using signals it receives from the environment. The system uses its own antenna elements to receive signals, compute differential distance vectors, and determine phase centers without requiring external calibration equipment or manual intervention, thus simplifying coordination as the array scales.
Solution Approach 2:
The patent transforms the static, manufacturer-provided phase center parameters into dynamic, calculated values that adapt to the actual operating conditions of the antenna array. By computing phase centers based on received signal characteristics and antenna geometry, the system adjusts parameters in real-time to maintain optimal beamforming performance regardless of array size or configuration changes.
3Measurement precision
If precise phase center location data is obtained through conventional calibration methods, then beamforming accuracy can be maintained, but the process requires off-task operations and increases latency
Solution Approach 1:
The patent enables continuous phase center determination by calculating locations based on signals received during normal operational tasks. Instead of requiring separate calibration periods where the antenna array is idle, the system computes phase centers using signals received during active transmission or reception operations, thus eliminating downtime and reducing latency.
Solution Approach 2:
The patent performs phase center calculations using signals that are already present in the environment during normal operations. By utilizing available signal data and pre-computing differential distance vectors from known antenna positions, the system prepares accurate phase center information in advance of when it is needed for beamforming, eliminating the need for time-consuming on-demand calibration.
Data Source
AI summary
A method for operating a communications system is provided. The method includes receiving a plurality of signals at a plurality of antenna elements, the plurality of signals arriving at the array of antenna elements at a plurality of angles of arrival (AOAs) with respect to a reference location. The method also includes calculating a plurality of differential distance vectors between the plurality of antenna elements and the reference location, each of the plurality of differential distance vectors associated with one of the plurality of AOAs and at least one of the pluralities of signals. The method further includes obtaining a plurality of actual phase center locations for the plurality of antenna elements based on the plurality of differential distance vectors and the plurality of AOAs and providing a correction to configuration data for the array of antenna elements based at least on the plurality of actual phase center locations.