L-Shaped Antenna Array for Radar Angle Resolution
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Solution Overview
Problem
Current wide-angle radar devices face challenges in detecting objects such as pedestrians and vehicles over a wide range due to limitations in aperture length and resolution, particularly when downsizing and reducing costs, which restricts their ability to effectively scan in both horizontal and vertical directions.
Innovation Solution
The radar device employs a configuration with Nt transmitting antennas and Na receiving antennas, arranged in a specific pattern to maximize the aperture length of the virtual receiving array, allowing for increased resolution and reduced false detection by optimizing the spacing and arrangement of antennas to achieve a larger effective aperture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the number of transmitting and receiving antennas is reduced to achieve downsizing and cost reduction, then the device size and cost decrease, but the aperture length of the virtual receiving array is restricted, leading to degraded angle resolution
Solution Approach 1:
The patent transitions from one-dimensional linear antenna arrangement to two-dimensional L-shaped arrangement, where transmitting antennas are positioned at coordinates (0,0), (d,0), (0,d), (d,d) and receiving antennas at (2d,0), (0,2d), (2d,d), (d,2d). This dimensional change creates a virtual receiving array with extended aperture length of 5d in both horizontal and vertical directions, achieving high angle resolution with reduced physical antenna count.
Solution Approach 2:
The antenna array is segmented into transmitting and receiving subsets with distinct spatial configurations. The transmitting antennas occupy one L-shaped pattern while receiving antennas occupy another, allowing the system to generate a virtual array with larger effective aperture than either physical array alone, thereby resolving the contradiction between reduced physical size and maintained measurement precision.
2Device complexity
If conventional linear antenna arrangements are used, then the device structure is simple, but the aperture length in two-dimensional scanning is restricted, leading to degraded detection performance
Solution Approach 1:
The patent employs L-shaped two-dimensional arrangements for both transmitting and receiving antennas instead of conventional linear one-dimensional arrangements. This dimensional expansion allows the virtual receiving array to achieve extended aperture length of 5d in both horizontal and vertical directions, significantly improving angle resolution while maintaining relatively simple device structure through systematic coordinate positioning.
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
This configuration enhances the radar device's ability to perform two-dimensional beam scanning with improved angle resolution and reduced calculation complexity, achieving downsizing and cost reduction while maintaining effective detection capabilities.
Implementation Method 1
radar transmission circuitry which, in operation, transmits Nt radar signals through Nt transmitting antennas
Implementation Method 2
radar reception circuitry which, in operation, receives and performs Doppler frequency analysis processing on at least one reflected wave signal
Data Source
AI summary
Nt transmitting antennas include Nt1 (Nt>Nt1) transmitting antennas arranged on a first straight line at a first spacing, and (Nt+1−Nt1) transmitting antennas arranged on a second straight line at a second spacing in a direction orthogonal to the Nt1 transmitting antennas, where Nt1 is a value that maximizes Nt1×(Nt+1−Nt1). Na receiving antennas include Na1 (Na>Na1) receiving antennas arranged on the first straight line at a third spacing, and (Na+1−Na1) receiving antennas arranged on the second straight line at a fourth spacing in a direction orthogonal to the Na1 receiving antennas, where Na1 is a value that maximizes Na1×(Na+1−Na1).