Continuous Wave Interference Cancellation in Radar Systems
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Solution Overview
Problem
Radar systems face interference from other radar systems, leading to sensor blinding and increased risk of vehicle collisions due to continuous wave (CW) interference, which existing technologies have not effectively addressed.
Innovation Solution
A method is introduced to cancel CW interference in radar systems by defining an integration time period, dividing it into sub-periods, integrating detected signals at symmetrical opposite polarities of a down-converted interferer signal, and adding sub-period integrated values to cancel interference residues, thereby generating a corrected integrated value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radar systems operate in increasing numbers, then the coverage and utility of radar networks improve, but the level of interference between radar systems increases proportionally
Solution Approach 1:
The patent converts the harmful CW interference signal into a useful component for cancellation. By detecting the interferer signal, down-converting it to baseband, and using it to generate cancellation signals that are subtracted from the received signal, the system transforms the harmful interference into a beneficial cancellation mechanism that improves overall radar performance in dense radar environments
Solution Approach 2:
The patent extracts the CW interferer signal from the composite received signal by detecting it separately and down-converting it to baseband. This extracted interferer component is then used to generate cancellation signals that remove the interference from the main radar signal path, effectively separating the harmful interference from the useful radar returns
2Reliability
If continuous wave interference is present, then radar sensor blinding occurs and collision risk increases, but existing technologies fail to effectively address this interference
Solution Approach 1:
The patent introduces an intermediary CW interferer cancellation module that acts as a mediator between the received signal and the processing chain. This module detects the interferer, generates cancellation signals through down-conversion and subtraction, and removes the CW interference before the signal reaches subsequent processing stages, preventing sensor blinding and maintaining reliable radar operation
Solution Approach 2:
The patent applies preliminary anti-action by detecting and cancelling the CW interferer signal before it can cause harmful effects such as sensor blinding. The cancellation process occurs in the signal reception chain prior to target detection and processing, preventing the interference from degrading radar performance rather than attempting to correct it after damage occurs
Data Source
AI summary
Methods and systems for cancelling continuous wave interference in radar systems include defining an integration time period, dividing the integration time period into sub-periods during which the radar sensor system transmits a radar signal integrating a detected signal during both sub-periods to generate sub-period integrated values, wherein integration in the sub-periods is triggered at points of symmetrical opposite polarities of a down converted interferer signal having a non-integer number of cycles in each sub-period, and adding tire respective sub-period integrated values to cancel interference residue of opposite polarity in the respective sub-periods.