FMCW Radar Beat Signal Interference Masking
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Solution Overview
Problem
Current radar systems, particularly FMCW radar, face interference issues from other radar systems, leading to degraded performance or failure, and struggle with false target detection and noise artifacts in radar images.
Innovation Solution
A method to produce interference-reduced radar images by identifying and masking interference segments in the measured sequence of beat signals, creating a doctored representation and doctoring mask, and estimating a reconstructed range-doppler image through deconvolution, which reduces noise and artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radar systems operate in increasing numbers for surveillance and vehicle applications, then the coverage and monitoring capability improve, but interference between different radar systems increases causing performance degradation or failure
Solution Approach 1:
The patent identifies interference segments in the beat signal sequence and converts the harmful interference into useful information by using it to create a mask that selectively removes only the interfering portions while preserving legitimate target signals. The interference pattern itself becomes the key to filtering it out.
Solution Approach 2:
The patent segments the beat signal sequence into individual segments and identifies which segments contain interference. By processing segments individually and applying masking selectively to interference-containing segments, the system can remove interference from specific portions while preserving clean segments.
2Device complexity
If traditional radar processing is used to maintain simple processing, then device complexity remains low, but false target detections and noise artifacts increase
Solution Approach 1:
The patent applies masking to the beat signal sequence before performing range-Doppler processing. This preliminary action removes interference segments beforehand, preventing them from creating false targets or noise artifacts during subsequent processing steps.
Solution Approach 2:
The patent introduces a mask as an intermediary element that mediates between the raw beat signal and the final processed image. The mask selectively attenuates interference components while allowing legitimate signals to pass through to the range-Doppler processor.
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
This approach significantly reduces background noise, enhances target detection probability, and minimizes false target detections, resulting in clearer and more interpretable radar images.
Implementation Method 1
a radar unit configured to: receive a measured sequence of beat signals
Implementation Method 2
The FMCW radar receives, e.g. by a receiver antenna, a reflection of the radar wave signal
Implementation Method 3
By mixing the transmitted signal with the received signal, a beat signal may be produced
Data Source
AI summary
A method for producing an interference reduced radar image comprises receiving a measured sequence of beat signals; identifying one or more interference segments within the measured sequence of beat signals, an interference segment being a segment subject to an interference; doctoring the measured sequence of beat signals by creating a doctored representation of the measured sequence of beat signals in the form of a matrix Y; creating a doctoring mask representing the doctoring of the measured sequence of beat signals, the doctoring mask being a matrix M; and estimating a reconstructed range-doppler image {circumflex over (X)} from Y and M, wherein the reconstructed range-doppler image is a range-doppler image of Y which is deconvolved using M; such that doctoring the measured sequence of beat signals at least partially removes interference effects and estimating a reconstructed range-doppler image at least partially removes image artefacts created by the doctoring.