Radar Sensor Interference Rejection via Predictive Signal Comparison
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Solution Overview
Problem
Radar sensors in motor vehicles often experience interference from other radar sensors operating within the same frequency range, leading to erroneous evaluations as the interfering signal is mistaken for the reflected signal, causing disruptions in detecting oncoming traffic and objects.
Innovation Solution
A radar sensor system that uses a signal generating device and a signal receiving device with a prediction method to establish a predicted signal, allowing for the detection and elimination of disruptions by comparing received signals to the predicted signal, utilizing linear predictive encoding to anticipate the expected signal and detect discontinuities caused by interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radar sensors operate in the same frequency range to enable widespread vehicle assistance systems, then the coverage and utility of radar detection is improved, but the probability of interference between multiple radar sensors increases
Solution Approach 1:
The patent converts the harmful interference signal from other radar sensors into a beneficial detection opportunity. By analyzing the received signal and comparing it with predicted signal characteristics, the system identifies disruptions caused by interfering radars and uses this information to distinguish between genuine target reflections and interference, thereby transforming the harmful frequency congestion into a means for interference detection and rejection
Solution Approach 2:
The patent introduces an intermediary signal processing mechanism that mediates between the incoming radar signals and the evaluation system. The prediction method acts as an intermediary layer that generates expected signal patterns, allowing the system to compare actual received signals against these predictions and identify deviations caused by interference, thus facilitating reliable target detection despite frequency congestion
2Power
If the receiver-side radar sensor receives signals from multiple sources in the same frequency range, then the signal strength is improved, but the ability to accurately distinguish reflected signals from outgoing signals deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the received signals are continuously compared with predicted signal patterns generated from knowledge of the outgoing signal characteristics. This feedback loop allows the system to identify deviations between expected and actual signals, enabling it to distinguish between genuine reflections and interfering signals from other radars, thereby maintaining measurement precision despite receiving multiple signal sources
3Ease of manufacture
If radar sensors use predetermined frequency bursts for outgoing signals, then the structured signal generation is simplified, but the reliability of signal evaluation in the presence of interference deteriorates
Solution Approach 1:
The patent applies preliminary action by generating predicted signal patterns in advance based on the known characteristics of the outgoing radar signals. These predictions are created before the actual signal reception and evaluation, establishing a reference framework that enables reliable distinction between expected signals and interference, thereby maintaining evaluation reliability without complicating the signal generation process
Data Source
AI summary
A radar sensor having a signal generating device which generates an outgoing signal as a radar signal that is to be emitted. The radar sensor also has a signal receiving device for receiving and processing received signals as reflected radar signals. The received signals can be processed with a prediction method in order to determine a predicted signal, which can be compared to the received signal in order to eliminate disruptions deviating therefrom.