Radar Angular Resolution via Neural Network Signal Processing

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Solution Overview

Problem

Radars face limitations in achieving high angular resolution without increasing the size of the radar system, which is crucial for applications like automotive, aviation, and robotics, where distinguishing closely spaced objects is essential.

Innovation Solution

The use of an artificial neural network to improve angular resolution by training with reflected signals and providing a magnitude and angle image, leveraging algorithms like mirroring, Burg, interpolation, and extrapolation, and weighting outputs to enhance imaging capabilities without requiring complex MIMO systems or large antenna arrays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If massive antenna systems are used to achieve good angular resolution, then angular resolution is improved, but device complexity and size increase

Engineering Contradiction:
Improveangular resolutionVSAvoidantenna system complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces the mechanical/physical approach of using massive antenna arrays with a computational/neural network-based approach. The neural network processes reflected signals to generate magnitude and angle images, achieving high angular resolution through algorithmic processing rather than physical antenna expansion. This substitution resolves the contradiction by achieving improved measurement precision without increasing device complexity.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent uses neural network models to create virtual representations of the radar imaging process. By training the neural network on reflected signals and reference signals, the system creates a computational model that can generate accurate magnitude and angle images without requiring physical duplication of antenna elements. This copying approach achieves high resolution through software-based signal processing.

Inventive Principle:
Principle #26Copying

2Measurement precision

If massive antenna systems are used to achieve good angular resolution, then angular resolution is improved, but the size of the radar increases

Engineering Contradiction:
Improveangular resolutionVSAvoidradar size
Core Design Contradiction:
Measurement precisionVSVolume of moving object

Solution Approach 1:

The patent substitutes physical antenna expansion with computational processing. Instead of increasing the physical volume of the radar system to improve angular resolution, the invention uses neural network-based signal processing to achieve the same resolution improvement, thereby maintaining a compact radar size while enhancing measurement precision.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent transitions from a spatial dimension solution (physically larger antenna array) to a computational dimension solution (neural network processing). By moving the resolution enhancement from the physical domain to the computational domain, the system achieves high angular resolution without increasing the radar's physical volume.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

3Measurement precision

If massive antenna systems are used to achieve good angular resolution, then angular resolution is improved, but costs increase

Engineering Contradiction:
Improveangular resolutionVSAvoidsystem complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces expensive physical antenna expansions with more cost-effective computational processing. By using neural networks to handle signal processing tasks that would otherwise require massive antenna systems, the invention achieves high angular resolution at lower cost, resolving the contradiction between improved measurement precision and increased system complexity.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS20230036450A1Improving angular resolution of radars using an artificial neural network
Publication Date: 2023.02.02 TEKNOLOGIAN TUTKIMUSKESKUS VTT OY
  • US20230036450A1 patent drawing
  • US20230036450A1 patent drawing
  • US20230036450A1 patent drawing

AI summary

According to an example aspect of the present invention, there is provided a method comprising, receiving, from a radar, a first reflected signal and a second reflected signal, determining a reference signal of the first reflected signal and training an artificial neural network using the first reflected signal and the reference signal of the first reflected signal, upon training, determining an output of the artificial neural network associated with the first reflected signal and providing a magnitude and angle image of the radar associated with the second reflected signal based on the output of the artificial neural network associated with the first reflected signal.