Motor Vehicle Radar Sensor Interference Reduction
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Solution Overview
Problem
Radar sensors in motor vehicles face interference from external sources, such as other radar devices, which can impair their operation due to simultaneous emission of chirp signals, and existing methods like varying chirp signal parameters are not sufficient to prevent interference effectively.
Innovation Solution
Randomly adjusting the duration of transmission pauses between sequences of frequency-modulated chirp signals emitted by the radar sensor to reduce the likelihood of interference, using either pseudo-random or real random number generation based on the received signal power, ensuring a minimum pause time to prevent immediate sequence disturbance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radar sensors emit frequency-modulated chirp signals in sequences to detect target objects, then detection capability is improved, but interference from external radar sources and mutual interference between sensors increases
Solution Approach 1:
The patent applies periodic action by structuring the radar signal transmission as repeated sequences of chirp signals separated by transmission pauses. Each sequence consists of multiple chirp signals transmitted at regular intervals, creating a periodic transmission pattern that allows for systematic interference management through the pause intervals between sequences
Solution Approach 2:
The patent implements dynamics by randomly adjusting the duration of transmission pauses between sequences. This dynamic modification of the transmission timing prevents synchronous operation with external radar sources, as the pause duration varies rather than remaining fixed, thereby reducing the probability of persistent interference patterns
2Area of stationary object
If multiple radar sensors operate simultaneously at the same frequency, then coverage area is improved, but mutual interference between sensors of the same vehicle increases
Solution Approach 1:
The patent applies local quality by having different radar sensors within the same vehicle employ different random pause duration patterns. While all sensors use the same basic transmission sequence structure, each sensor's local pause timing is independently randomized, creating local differentiation that prevents synchronous interference while maintaining overall system coverage
Solution Approach 2:
The patent implements dynamics through random adjustment of transmission pause durations for each sensor. This dynamic timing variation ensures that even when multiple sensors operate simultaneously, their transmission patterns are desynchronized, preventing persistent mutual interference while allowing all sensors to contribute to the overall coverage area
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
Significantly reduces the probability of interference between radar sensors of the same vehicle and external sources, ensuring reliable operation by desynchronizing the emission of chirp signals and minimizing mutual interference.
Implementation Method 1
Radar sensors generally serve for detecting target objects in the environment of the motor vehicle... the radar sensor emits a transmit signal (electromagnetic waves), which is then reflected on the target object to be detected and received by the radar sensor as radar echo
Implementation Method 2
the emitted signal includes several sequences (bursts) of frequency-modulated chirp signals, which are emitted one after the other... the received signal of the radar sensor also includes such a plurality of sequences each having a plurality of chirp signals
Data Source
AI summary
The invention relates to a method for operating a radar sensor (5, 6) of a motor vehicle (1), in which for detecting a target object (12) in an environment of the motor vehicle (1), a transmit signal (S) is emitted by means of the radar sensor (5, 6) and an echo signal reflected on the target object (12) is received as a received signal, wherein a plurality of sequences (13) each including a plurality of frequency-modulated chirp signals (14) is emitted one after the other by means of the radar sensor (5, 6) as the transmit signal (S), and wherein a transmission pause (15) respectively follows each sequence (13), in which the radar sensor (5, 6) does not emit any chirp signals (14). The period of time of the transmission pauses (15) is respectively randomly adjusted in the operation of the radar sensor (5, 6).