Stereo Radar Tracking Angular Resolution
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Solution Overview
Problem
Traditional array-based radar systems are limited in angular resolution, which diminishes as the size of the array increases, and they rely on inaccurate far-field approximations, leading to decreased performance and accuracy in tracking targets.
Innovation Solution
A stereo radar tracking system with a transmitter and a horizontal or vertical stereo receiver array, where each set of elements has different angles to the target, allowing for joint processing of data and enhanced angular resolution through the use of Doppler frequency shift data and phase information, overcoming the limitations of traditional uniformly spaced linear arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional array-based radar systems use larger arrays to improve angular resolution, then the array size increases, but the far-field approximation becomes less accurate and angular resolution diminishes
Solution Approach 1:
The receiver array is divided into multiple element sets (first element set and second element set) with different spacing configurations. Each set processes signals independently using its own far-field approximation, and the results are combined to achieve high angular resolution without requiring the entire large array to satisfy far-field conditions simultaneously.
Solution Approach 2:
The patent transitions from a single uniform array configuration to a multi-dimensional stereo array configuration with at least two element sets having different spacings. This dimensional change allows the system to achieve parallax effect and improved angular resolution while maintaining valid far-field approximations for each individual element set.
2Measurement precision
If traditional radar systems use large arrays to improve tracking accuracy, then the array size increases, but the system complexity and cost increase
Solution Approach 1:
Instead of using one large complex array, the system segments the array into multiple smaller element sets with different spacing configurations. Each set can be simpler to implement, and their combined output achieves the tracking accuracy of a large array through joint processing.
Solution Approach 2:
The patent employs asymmetric spacing configurations where different element sets have different distances between elements. This asymmetry creates a stereo effect that improves angular resolution and tracking accuracy without requiring symmetric large-scale array geometries, thereby reducing overall system complexity.
3Ease of manufacture
If traditional radar systems use uniformly spaced linear arrays, then the array structure is simple, but angular resolution depends on both array size and angle to target
Solution Approach 1:
The patent introduces asymmetric spacing between element sets, where the first element set has a first spacing and the second element set has a second spacing that is different from the first. This asymmetric configuration enables the system to achieve consistent angular resolution across different target angles, overcoming the limitation of uniform arrays where resolution varies with angle.
Solution Approach 2:
The system adds a dimensional aspect by introducing multiple element sets with different spacing configurations rather than using a single uniform line. This multi-dimensional arrangement creates parallax effects that improve angular resolution independence from target angle, while each individual set maintains manufacturing simplicity.
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 stereo radar system provides improved angular resolution and tracking accuracy by processing data from multiple element sets with known spatial relationships, enabling more precise determination of target position and velocity without the high cost and complexity of large traditional radar arrays.
Implementation Method 1
calculate azimuth and/or elevation by measuring the time or phase difference between received probe signals at different receivers (or antennas) within the array(s)
Implementation Method 2
enhanced angular resolution through the use of Doppler frequency shift data and phase information
Data Source
AI summary
A method for non-coherent stereo radar tracking includes, at a stereo radar system, transmitting a probe signal, receiving a reflected probe signal in response to reflection of the probe signal by a tracking target, calculating first and second target ranges from the reflected probe signal data, transforming the reflected probe signal data based on the first and second target ranges, and calculating a first target angle from the transformed reflected probe signal data.