Circular Displaced Sensor Array for Direction of Arrival Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing DOA techniques, such as Uniform Circular Array (UCA) and Uniform Linear Displaced Sensor Array (UL-DSA), face challenges in resolving signal coherency and have high computational complexity, leading to reduced accuracy and resolution in measuring the Direction of Arrival of wireless signals.
Innovation Solution
The Uniform Circular Displaced Sensor Array (UC-DSA) system, comprising two circular antenna arrays with equal numbers of omni-directional antennas arranged in concentric circles and separated by a preset minimum distance, uses a DOA estimator and triangulation system to process signals and localize sources with reduced computational complexity and improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Uniform Circular Array (UCA) technique is used to measure DOA, then the system can obtain angle data using radio array methods, but it cannot resolve signal coherency problem and has high computational complexity
Solution Approach 1:
The patent divides the circular array into two separate circular arrays with different radii. This segmentation allows the system to process signals from multiple arrays with distinct geometric configurations, enabling resolution of signal coherency issues that cannot be solved by a single UCA. The two arrays are processed independently and then combined to achieve better DOA estimation.
Solution Approach 2:
The patent transitions from a single-plane circular array to a two-plane configuration with arrays at different radii. This dimensional change in the array geometry provides additional spatial information that helps resolve signal coherency problems and reduces computational complexity compared to traditional single-array methods.
2Quantity of substance
If Uniform Linear Displaced Sensor Array (UL-DSA) technique is used, then two parallel equally spaced omni-directional antennas are provided, but correlated signals cannot be separated since signals coincide in phase
Solution Approach 1:
Instead of using a single linear displaced array, the patent segments the sensor array into two circular arrays with different radii. This segmentation creates different phase relationships for correlated signals, enabling separation of signals that would otherwise coincide in phase in a linear configuration.
Solution Approach 2:
The patent transitions from a linear array configuration to circular array configurations. The curved geometry of circular arrays provides different path lengths and phase relationships compared to linear arrays, enabling separation of correlated signals that cannot be separated by linear displaced sensor arrays.
3Measurement precision
If traditional DOA techniques are used, then angle data can be obtained, but accuracy and resolution are less compared to UC-DSA
Solution Approach 1:
The patent adds a radial dimension to the array configuration by using two circular arrays at different radii instead of a single array. This dimensional enhancement provides additional spatial sampling that improves DOA estimation accuracy and resolution while maintaining manageable system complexity through uniform circular geometries.
Solution Approach 2:
The patent creates a composite array structure by combining two circular arrays with different radii into a unified DOA estimation system. This composite configuration leverages the strengths of multiple array geometries to achieve superior accuracy and resolution compared to individual array types.
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
The UC-DSA system effectively separates correlated signals, provides high resolution, and reduces computational complexity, outperforming traditional methods in accuracy and coverage, especially at near end-fire angles.
Implementation Method 1
The two circular antenna arrays with the same number of elements are placed on different radii and are shifted to have equal separation between inner elements and outer elements. The Radio frequency (RF) receiver is provided to capture a wireless signal incident on a circular antenna array.
Data Source
AI summary
The various embodiments herein provide a Uniform Circular Displaced Sensor Array (UC-DSA) system and method for measuring/estimating Direction of Arrival (DOA) of a wireless signal. The UC-DSA system comprises at least a set of two circular antenna arrays. The two circular antenna arrays have a number of elements. A Radio frequency (RF) receiver captures a wireless signal incident on a circular antenna array. A Direction of Arrival (DOA) estimator processes a received input signal and a Triangulation system provides the exact location of the source of the wireless signal. The two circular antenna arrays with the same number of elements are placed on different radii, and are shifted to have equal separation between inner elements and outer elements.