Vehicle Radar Beam Pattern Control for Range and Angular Resolution
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Solution Overview
Problem
Existing radar sensor technologies for vehicles face challenges in maintaining high angular resolution and improving performance due to limitations in configuring virtual arrays through multiple-input and multiple-output (MIMO) and adjusting beam patterns.
Innovation Solution
A radar sensor apparatus for vehicles that maintains high angular resolution by maximizing the number of virtual arrays of antennas using a fixed beam pattern and adjusts the application ratio of high-resolution and long-range modes based on vehicle states and surrounding environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a beam pattern is changed to adjust long-range and short-range detection, then detection distance is improved, but angular resolution deteriorates
Solution Approach 1:
The patent applies dynamics by making the beam pattern adjustable rather than fixed. The control device dynamically switches between a first beam pattern optimized for long-range detection and a second beam pattern optimized for short-range detection, allowing the radar sensor to adapt its detection characteristics based on operational requirements while maintaining high angular resolution through the fixed antenna array configuration.
2Speed
If multiple antennas are controlled to change beam pattern, then detection range is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the detection range into distinct zones (long-range and short-range) with dedicated beam patterns for each. Instead of continuously adjusting a single complex beam pattern, the system segments the operational requirements and assigns specific simplified beam patterns to each segment, reducing the overall control complexity while maintaining effective detection across all ranges.
3Measurement precision
If virtual arrays are configured through MIMO, then angular resolution is improved, but ease of operation deteriorates
Solution Approach 1:
The patent applies copying by creating virtual antenna arrays through signal processing that replicates the functionality of additional physical antennas. The MIMO configuration generates virtual arrays by combining signals from multiple transmitting and receiving antennas, effectively copying the detection capabilities of a larger antenna system without requiring additional physical components, thus maintaining ease of operation while improving angular resolution.
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 solution enhances radar sensor performance by maintaining high angular resolution and improving detection capabilities in varying environments, allowing for optimal detection distance and speed resolution.
Implementation Method 1
Radar is a device that radiates electromagnetic wave signals through a transmitting antenna (referred to as a 'Tx antenna'), receives the signal reflected from a target from a receiving antenna (referred to as an 'Rx antenna'), and generates detection information such as the distance, speed, and angle of the target by using the received signal.
Data Source
AI summary
A radar sensor apparatus for a vehicle includes a sensor device including a plurality of radar sensors, each of which detects a surrounding target by irradiating a radar signal based on a beam pattern, and a control device that controls the plurality of radar sensors by adjusting an application ratio of a high-resolution mode based on a short range, and a long-range mode depending on a change in a state and surrounding environment of a vehicle.