Vehicle Radar Sensor Simultaneous Near Far Range Detection
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Solution Overview
Problem
Radar sensors in vehicles face latency issues when switching between near and far range operating modes, leading to delayed detection of approaching objects, especially in scenarios requiring high distance resolution for safety and tracking.
Innovation Solution
Simultaneous transmission and reception of radar signals in both near and far frequency ranges within a common time window, allowing for concurrent detection and evaluation, reducing latency by isolating signals via frequency separation and using separate processing units for each range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radar sensor switches between near range operating mode and far range operating mode, then the distance resolution for close objects is improved, but the detection latency for approaching objects increases
Solution Approach 1:
The patent divides the frequency spectrum into multiple frequency ranges (first frequency range for near range, second frequency range for far range). By segmenting the frequency resource, the radar sensor can simultaneously perform near range detection with high distance resolution and far range detection for approaching objects, eliminating the need to switch between operating modes and thus reducing detection latency while maintaining measurement precision.
2Measurement precision
If a higher frequency bandwidth is used for near range detection, then the distance resolution is increased, but the maximum evaluable range is reduced
Solution Approach 1:
The patent applies local quality by assigning different frequency ranges to different detection needs: the first frequency range with higher bandwidth is dedicated to near range detection requiring high distance resolution, while the second frequency range with lower bandwidth is dedicated to far range detection. This localized optimization allows each frequency range to excel at its specific detection task without compromising the other.
Solution Approach 2:
The patent transitions from temporal multiplexing (switching between modes over time) to frequency domain multiplexing (simultaneous operation in different frequency ranges). By adding the frequency dimension as a separation mechanism, the system achieves both high distance resolution for near objects and extended range for far objects simultaneously, resolving the trade-off between these two parameters.
3Measurement precision
If the radar sensor operates in near range operating mode, then the distance resolution is improved, but the coverage area is reduced and detection of far objects is delayed
Solution Approach 1:
The patent makes the radar sensor multi-functional by enabling simultaneous near range detection and far range detection through frequency division. The radar sensor can now serve both near range applications (requiring high distance resolution) and far range applications (requiring large coverage area) concurrently, eliminating the need to choose one operating mode over the other and thus maintaining universal applicability across different detection scenarios.
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 reduces latency by 60-75%, enabling continuous and high-resolution object tracking without jumps in scanning times, improving the stability of tracking algorithms and detection accuracy across the entire coverage area.
Implementation Method 1
The basic principle of radar sensors is the emission of electromagnetic waves, the radar signals, which are reflected against an object and received back again
Implementation Method 2
the emission of electromagnetic waves, the radar signals, which are reflected against an object and received back again
Implementation Method 3
in the context of the evaluation of received radar signals, inter alia, a fast Fourier transformation takes place, which converts a received frequency spectrum back to run times
Data Source
AI summary
A radar sensor in a motor vehicle has at least one antenna arrangement for emitting and receiving radar signals and a processing device for evaluating received radar signals. The antenna arrangement is controlled to simultaneously emit and receive radar signals both in a far frequency range and in a near frequency range, where the bandwidth of the near frequency range is greater than that of the far frequency range. The received radar signals of the near frequency range are evaluated as radar data of a higher distance resolution and received radar signals of the far frequency range are evaluated as radar data of a lower distance resolution.