UWB Motion Detection Radar Using Spatio-Temporal Energy Patterns
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Solution Overview
Problem
Existing motion detection radar devices in vehicles are prone to noise sensitivity, interference, and require specific training that may not be compatible with all vehicle types, leading to costly filtering and potential erroneous detections.
Innovation Solution
A motion detection radar device using UWB waves, a transmitting-receiving circuit, memory circuit, and processing circuit to process spatio-temporal radar wave energy distributions, employing Hough transforms and correlations to detect intended movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If millimeter wave radar signals with high amplitude are used to detect movement, then the detection range and signal strength are improved, but noise sensitivity and stray echoes increase hampering signal processing
Solution Approach 1:
The patent changes the radar signal parameter from millimeter wave to ultra-wideband (UWB) wave, fundamentally altering the frequency characteristics. This parameter change allows the system to maintain sufficient detection power while operating in a frequency band that is less susceptible to noise and interference from vehicle-mounted radar signals
Solution Approach 2:
The patent introduces an intermediary processing stage that compares the received radar echo signal with a reference signal containing expected movement patterns. This intermediary comparison mechanism filters out noise and stray echoes by identifying characteristic movement patterns rather than relying solely on signal amplitude
2Ease of operation
If millimeter wave radar devices are embedded in the vehicle to enable convenient movement detection, then ease of operation is improved, but interference with other radar devices increases leading to data destruction
Solution Approach 1:
The patent changes the operating frequency parameter from millimeter wave to ultra-wideband (UWB), which operates in a different spectral range. This parameter change reduces interference with other vehicle-mounted radar devices while maintaining the embedded installation advantage for convenient movement detection
3Measurement precision
If artificial intelligence tools are used to process radar echoes for movement detection, then detection accuracy is improved, but computational intensity and training requirements increase
Solution Approach 1:
The patent extracts and compares specific characteristic features from the radar echo signal against a reference signal containing expected movement patterns. This extraction approach focuses computational effort on identifying key movement characteristics rather than processing the entire signal with complex AI algorithms, reducing computational intensity while maintaining detection accuracy
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
Reduces noise interference, minimizes computational intensity, and enhances detection robustness by using UWB waves, allowing for accurate and efficient trunk door operation without user input.
Implementation Method 1
a transmitting-receiving circuit configured to transmit a sequence of radar waves and receive a sequence of reflected radar waves
Implementation Method 2
which produces images based on the Doppler effect
Implementation Method 3
the comparison implemented comprises an application of a Hough transform on said at least one part of the first matrix image, and configured to determine the value of a first motion detection variable as a function of at least values of slopes of straight lines obtained by the application of the Hough transform
Implementation Method 4
the comparison implemented comprises at least one calculation of a correlation between said at least one part of the first matrix image and at least one second matrix image
Data Source
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AI summary
The present description relates to a motion detection radar device (100) comprising at least: - a transmission-reception circuit (104) configured to transmit a sequence of radar waves and receive a sequence of reflected radar waves; - a memory circuit (106) configured to store at least one first matrix image representative of a spatio-temporal distribution of the energy of the reflected radar waves; - a processing circuit (108) configured to implement at least one comparison, from at least a part of the first matrix image, of the spatio-temporal distribution of the energy of the reflected radar waves with an expected spatio-temporal energy distribution for at least one movement intended to be detected.