Vehicle Radar Dynamic Frequency Bandwidth Control
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Solution Overview
Problem
In a multiple reception path environment, vehicle radar devices face challenges in accurately acquiring lateral position information and distance resolution due to signal overlap, which is exacerbated by obstacles like guardrails and sound barriers, and increasing frequency bandwidth reduces maximum detection distance.
Innovation Solution
A vehicle radar system that dynamically adjusts its frequency bandwidth based on target distance and specific driving conditions, allowing it to switch between different frequency band modes to optimize distance resolution and maintain detection performance without reducing other radar capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the frequency bandwidth of the radar signal is increased to improve distance resolution, then the distance resolution is improved, but the maximum detection distance is decreased
Solution Approach 1:
The radar device dynamically adjusts the frequency bandwidth based on the detected distance to the target. When the target is within a specific distance range, the device increases the frequency bandwidth to improve distance resolution. When the target is beyond this range, the device reduces the frequency bandwidth to extend the maximum detection distance. This dynamic adjustment allows the system to optimize both distance resolution and maximum detection distance according to real-time operating conditions.
Solution Approach 2:
The invention changes the frequency bandwidth parameter of the radar signal based on the distance to the target. By adjusting this key parameter dynamically, the system achieves high distance resolution when needed while maintaining the capability to detect distant targets, thereby resolving the contradiction between these two performance metrics.
2Measurement precision
If the number of antennas is increased by hardware to improve distance resolution, then the distance resolution is improved, but the cost and space requirements increase
Solution Approach 1:
Instead of increasing the number of antennas hardware-wise, the invention achieves improved distance resolution by dynamically adjusting the frequency bandwidth parameter of the existing radar signal. This software-based parameter adjustment approach avoids the need for additional hardware components, thereby maintaining device simplicity while achieving the desired performance improvement.
Solution Approach 2:
The invention replaces the mechanical/hardware approach of adding more antennas with a signal processing approach that dynamically adjusts frequency bandwidth. This substitution eliminates the need for additional physical components while achieving the same goal of improved distance 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
This approach enables precise lateral position detection and improved distance resolution in multiple reception path environments while maintaining the maximum detection distance, effectively addressing the limitations of hardware-based solutions and frequency bandwidth expansion.
Implementation Method 1
an antenna unit including a transmission antenna for transmitting a transmission signal around the vehicle
Implementation Method 2
a receiving antenna for receiving a reception signal reflected from a target
Data Source
AI summary
The present disclosure relates to a vehicle radar device, a controlling method thereof, and radar system. A radar device according to an embodiment includes a transceiver being controlled to transmit the transmission signal in an operating frequency band according to a selection mode among a plurality of frequency band modes and to receive the reception signal through the receiving antenna, and a mode selector dynamically determining one of the plurality of frequency band modes as the selection mode based on at least one of a target distance to the target and a maximum detection distance for each frequency band. According to embodiments of the present disclosure, the distance resolution of the radar can be optimized by dynamically varying the frequency bandwidth linked with the maximum detection distance according to a target distance under specific driving conditions.