Constant Frequency Radar Transverse Movement Plausibility Check
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Solution Overview
Problem
Radar sensors in driver assistance systems have limited accuracy in measuring transverse movements of objects due to lower angular resolution and increased inaccuracies in FMCW methods, making it difficult to detect perpendicular movements and assess collision risks effectively.
Innovation Solution
Employing a radar signal with a constant signal frequency, which provides higher speed and angular resolution, allowing for a plausibility check of initially detected transverse movements by verifying the existence and movement of objects through Doppler shifts and calculating relative speeds and azimuth angles, thereby improving the accuracy of transverse movement detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If FMCW-modulated radar signals are used for object detection, then distance measurement capability is improved, but velocity resolution and angular resolution deteriorate
Solution Approach 1:
The patent segments the radar measurement process into two distinct phases: an FMCW phase for distance measurement and a continuous wave phase for velocity measurement. This segmentation allows each phase to be optimized for its specific measurement type, with the continuous wave phase providing high velocity resolution without the limitations of FMCW modulation
Solution Approach 2:
The patent implements periodic switching between FMCW-modulated signals for distance measurement and continuous frequency signals for velocity measurement. This periodic action allows the system to alternately perform both measurement functions, combining the advantages of both approaches while avoiding their respective drawbacks
2Volume of moving object
If FMCW-modulated radar signals are used for object detection, then distance measurement capability is improved, but angular resolution deteriorates
Solution Approach 1:
The patent segments the radar measurement process into two distinct phases: an FMCW phase for distance measurement and a continuous wave phase for angular and velocity measurements. This segmentation allows each phase to be optimized for its specific measurement type, with the continuous wave phase providing superior angular resolution
Solution Approach 2:
The patent implements periodic switching between FMCW-modulated signals for distance measurement and continuous frequency signals for angular measurement. This periodic action allows the system to alternately perform both measurement functions, combining the advantages of both approaches
3Loss of information
If FMCW-modulated radar signals are used for lateral movement detection, then distance information is obtained, but measurement accuracy deteriorates due to interference susceptibility
Solution Approach 1:
The patent segments the measurement process into FMCW phase for obtaining distance information and continuous wave phase for accurate lateral movement detection. This segmentation isolates the lateral movement measurement from FMCW interference issues while preserving distance information from the FMCW phase
Solution Approach 2:
The patent uses continuous frequency signals as an intermediary measurement approach to verify lateral movements detected by FMCW signals. The continuous wave acts as a mediator that provides independent verification, confirming whether detected lateral movements are genuine or artifacts of FMCW interference
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 enhances the precision of transverse movement detection, enabling a more reliable assessment of collision risks and reducing the likelihood of unauthorized emergency braking by confirming the existence and movement of objects with high accuracy.
Implementation Method 1
a radar signal with a periodically modulated frequency is emitted, and the radar signal reflected from an object is then received and analyzed. In addition to the relative velocity, the FMCW method allows the distance to the object to be determined based on the magnitude of the frequency difference between the emitted and received radar signals
Data Source
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AI summary
The invention relates to a method for checking the plausibility of an initially known transverse movement of an object (7), having the steps of: emitting a radar signal with a constant signal frequency and receiving reflections of the radar signal with a constant signal frequency by means of a radar device (2); and checking the plausibility of the transverse movement of the object (7) by analyzing frequency ranges corresponding to the transverse movement in a spectrum of the reflected radar signal with a constant signal frequency.