Radar Lens Imaging for High-Resolution DoA Estimation
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Solution Overview
Problem
Current radar devices face challenges in determining the Direction of Arrival (DoA) of radar waves with insufficient angular resolution, especially in automotive ADAS and aerospace applications, due to the size and complexity of large phased arrays, which limits their integration and signal-to-noise ratio.
Innovation Solution
A radar wave imaging device with a two-dimensional array of receiver members arranged in direct contact with a high-refractive index radar lens, utilizing imaging radar optics to perform beamforming without digital beamforming techniques, allowing for increased angular resolution and improved DoA estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If large phased arrays are used to increase angular resolution, then measurement precision is improved, but device complexity and size increase
Solution Approach 1:
The patent replaces the mechanical/electronic phased array system with an optical imaging system. Specifically, it uses a lens to perform beamforming optically, where the lens focuses incoming radar waves from different directions to different locations on the receiver array, eliminating the need for complex digital beamforming algorithms and phase shifters required in traditional phased arrays.
Solution Approach 2:
The patent introduces a lens as an intermediary optical element between the radar waves and the receiver array. This lens performs the beamforming function that would otherwise require complex electronic processing, by optically focusing waves from different directions to different receiver elements, thereby simplifying the overall system architecture.
2Measurement precision
If additional antenna members are added to increase angular resolution, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent substitutes the need for numerous individually controlled antenna elements with a passive optical lens system. The lens performs the directional filtering and focusing function that would otherwise require many active antenna elements with complex feeding networks, thereby reducing manufacturing complexity and cost.
3Measurement precision
If digital beamforming techniques are used for DoA estimation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces digital signal processing beamforming with optical beamforming using a lens. The lens physically focuses incoming plane waves from different directions to different spatial locations on the receiver array, providing directional information through spatial distribution rather than through complex digital processing of phase and amplitude data.
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 device achieves high-resolution 3D radar imaging with enhanced angular resolution and reduced ambiguity, enabling accurate detection, distance measurement, and velocity estimation of targets, while being compact and cost-efficient for integration in vehicles.
Implementation Method 1
The imaging radar optics unit comprises at least one radar lens that is arranged between the radar receiver members and the scene
Implementation Method 2
receiving radar waves reflected by objects that have been illuminated by the radar waves transmitted by the transmitter unit
Data Source
AI summary
A radar wave imaging device includes a radar transmitter unit having at least one radar transmit antenna for transmitting radar waves towards a scene and a radar receiving unit including a plurality of radar receiver members that are arranged as a two-dimensional array, for receiving reflected radar waves. The radar receiving unit includes an imaging radar optics unit for imaging at least a portion of a scene onto at least a portion of the two-dimensional array of radar receiver members. The imaging radar optics unit includes at least a first radar lens that is arranged between the radar receiver members and the scene. The radar receiver members are arranged in direct contact to a surface of the first radar lens that is facing away from the scene.