Radar Phase Correction for Interference Suppression
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Solution Overview
Problem
Radar sensors in automotive applications face interference issues due to overlapping radar signals from nearby vehicles, which can impair the detection of real targets and increase noise floors, making it difficult to accurately measure distances and velocities.
Innovation Solution
A method and device for radar sensors that involve receiving chirp echoes, generating digital signals, and calculating range maps with amplitude and phase values. The system identifies interference-affected chirp echoes and determines corrected phase values using unaffected echoes, allowing for interference suppression through smoothing operations and phase restoration techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radar sensors are deployed in dense vehicle environments, then coverage and sensing capability are improved, but interference from overlapping radar signals increases
Solution Approach 1:
The patent converts the harmful interference from other radar sensors into a beneficial reference signal for phase correction. By identifying that interference signals exhibit consistent phase behavior across frequency bins while target signals do not, the system uses the interference itself as a reference to correct phase errors in the received signals, thereby transforming the harmful factor into a useful resource for improving measurement accuracy
Solution Approach 2:
The patent changes the phase parameter of affected frequency bins by referencing the phase values from unaffected bins. Through phase correction processing that adjusts the phase of interference-affected signals based on the phase relationship between affected and unaffected frequency bins, the system restores the original phase information and enables accurate velocity measurement despite the presence of interference
2Measurement precision
If interference suppression techniques are applied, then measurement accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent applies local quality by performing phase correction only on the specific frequency bins that are affected by interference, rather than processing all frequency bins uniformly. The system identifies which frequency bins contain interference and applies phase correction selectively to those bins using the phase information from unaffected bins, thereby reducing the overall processing complexity while maintaining measurement accuracy
Solution Approach 2:
The patent uses partial action by applying phase correction only to the extent necessary - specifically to the frequency bins that are affected by interference. Rather than applying complex interference suppression to all signals, the system performs partial correction on affected bins using a relatively simple phase reference method, achieving sufficient measurement accuracy without excessive processing complexity
Data Source
AI summary
A radar method is described herein. In accordance with one embodiment the method includes receiving a plurality of chirp echoes of transmitted radar signals, generating a digital signal based on the plurality of chirp echoes, and calculating a range map based on the digital signal. The range map includes a plurality of values, each value is represented by an amplitude value and a phase value, and each value is associated with one frequency bin of a set of frequency bins and one chirp echo of the plurality of chirp echoes. The method further includes identifying chirp echoes which are affected by interference and determining, for one or more selected frequency bins, corrected phase values based on phase values that are associated with chirp echoes not identified as affected by interference.