ADC Interference Cancellation via Temporal Filter in Radar Sensors
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Solution Overview
Problem
Radar sensor systems in autonomous vehicles face interference issues when multiple radar systems operate in the same environment, leading to false detections and decreased performance.
Innovation Solution
The proposed solution involves identifying and compensating for radar signal samples affected by interference by analyzing the power variance of analog-to-digital conversion (ADC) signal samples and removing or adjusting samples with power magnitudes above a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radar sensor systems operate in the same environment, then radar coverage and detection capability are improved, but interference between radar signals causes false detections and decreased performance
Solution Approach 1:
The patent extracts and removes interfering radar signal components from the received signal spectrum. By identifying and extracting the interfering signals, the system maintains the ability to detect multiple radar systems (improving coverage) while eliminating the interference that causes false detections (improving reliability).
Solution Approach 2:
The patent introduces an intermediary signal processing stage that acts as a mediator between the received radar signals and the detection algorithm. This intermediary processing layer identifies and compensates for interfering signals, allowing the system to operate in environments with multiple radar systems without suffering from interference-induced false detections.
2Measurement precision
If wider bandwidth radar signals are used, then range resolution is improved, but interference from other radar systems becomes more significant
Solution Approach 1:
The patent applies local quality by treating different frequency components of the radar signal differently. Instead of uniformly processing the entire signal, the system identifies specific frequency regions contaminated by interference and applies targeted compensation only to those regions, while maintaining the high range resolution provided by wide bandwidth signals in the interference-free regions.
Data Source
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AI summary
A radar sensor system comprises a receive antenna that receives a radar return and circuitry configured to perform certain acts. The acts comprise receiving analog-to-digital converted (ADC) samples of a received radar signal and identifying power magnitudes for the ADC samples. The acts also comprise calculating a mean power value for ADC samples in a given ramp of the received radar signal and calculating a mean power variance of the ADC samples in the given ramp. The acts further comprise identifying a sample having a power magnitude above a power threshold. Additionally, the acts comprise adjusting the power magnitude of the identified sample to mitigate the interference effect caused by the identified sample.