Vehicle Radar Mode Switching for Critical Transverse Movement Detection
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Solution Overview
Problem
Current radar systems in vehicles lack effective methods to accurately detect critical transverse movements of objects, which are essential for predicting potential collisions, especially when precise distance determination is not required, and often result in false reports and inefficient switching between detection modes.
Innovation Solution
A method and device using CW radar signals to ascertain collision-relevant spectral ranges and time dependencies of relative velocity and object angle, allowing for the detection of critical transverse movements without precise distance determination, and activating different antenna devices to switch between CW and FMCW signals based on the situation for precise tracking and collision assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If FMCW modulation is used to determine both velocity and distance, then distance measurement capability is improved, but velocity determination accuracy deteriorates
Solution Approach 1:
The patent divides the detection task into two segments: CW mode is used for accurate velocity measurement and critical transverse movement detection, while FMCW mode is used for distance determination. This segmentation allows each modulation type to excel at its specific function, resolving the contradiction between velocity accuracy and detection versatility.
Solution Approach 2:
The system dynamically switches between CW and FMCW modulation modes based on the detection situation. When critical transverse movements are detected via CW mode, the system activates FMCW for distance measurement, creating an adaptive detection system that optimizes performance for each specific scenario.
2Area of stationary object
If multiple antenna devices with different detection ranges are used, then field of view coverage is improved, but device complexity increases
Solution Approach 1:
The system dynamically activates specific antenna devices based on the detection situation. When a critical transverse movement is detected in a specific direction, only the relevant antenna device is activated for FMCW distance measurement, rather than continuously operating all antennas. This reduces complexity while maintaining comprehensive coverage capability.
3Measurement precision
If CW modulation is used for accurate velocity determination, then velocity measurement precision is improved, but distance determination capability is lost
Solution Approach 1:
The detection system is segmented into two functional paths: CW modulation handles velocity measurement and critical transverse movement detection, while FMCW modulation handles distance determination. This segmentation allows the system to maintain high velocity precision while recovering distance determination capability when needed.
Solution Approach 2:
The system performs preliminary detection using CW mode to identify critical transverse movements before activating FMCW for distance measurement. This preliminary action allows the system to maintain velocity measurement precision continuously while obtaining distance information only when collision risk is detected.
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
Enables the efficient detection of critical transverse movements, reducing false reports and improving collision prediction accuracy by using CW radar signals for initial filtering and FMCW for precise tracking, thereby optimizing the monitoring of potential collision trajectories and reducing unnecessary mode switching.
Implementation Method 1
The received reflected radar signal has a frequency that differs from the frequency of the emitted radar signal. The frequency difference is a function of the relative velocity of the observed object.
Implementation Method 2
A further conventional modulation method is the frequency modulated continuous wave modulation or FMCW modulation. In this case, a radar signal having a variable frequency is emitted, so that it is possible to determine both the velocity as well as the distance of the investigated object by measuring the reflected radar signal.
Data Source
AI summary
A method for detecting critical transverse movements. The method includes the following steps: emitting a CW radar signal and generating radar data based on the received reflected CW radar signal with the aid of a radar device; ascertaining collision-relevant spectral ranges of the radar data as a function of an ego velocity of the radar device; ascertaining a time dependency of a relative velocity and of an object angle of an object by evaluating the radar data in the ascertained spectral ranges; and detecting a critical transverse movement of the object using the time dependency of the relative velocity and of the object angle of the object.