Radar Displacement Measurement via DC Component Removal
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Solution Overview
Problem
Current radar-based physiological signal measurement methods face challenges in accurately measuring displacement without direct current (DC) component removal, especially in environments with varying surroundings, which affects the quality of I and Q signals and limits the applicability in narrow spaces like human body detection.
Innovation Solution
A method and apparatus that divide reflected signals into I and Q components, estimate and remove the DC component by selecting valid constellation points and determining their circumcenter, allowing for accurate displacement measurement using a radar system with multiple frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DC component removal is not performed, then measurement can be done without additional processing steps, but displacement measurement accuracy deteriorates due to DC component interference
Solution Approach 1:
The patent applies preliminary action by estimating and removing the DC component from I and Q signals before displacement measurement. The system pre-processes the signals by calculating the DC component using constellation points and circumcenter determination, then subtracts it from the original signals. This preliminary processing eliminates DC interference that would otherwise degrade measurement accuracy, while maintaining efficient processing through automated algorithms.
2Measurement precision
If complex DC component estimation methods are used, then displacement measurement accuracy improves, but computing resource requirements increase
Solution Approach 1:
The patent implements self-service by having the system automatically estimate and remove its own DC component without external intervention. The algorithm selects constellation points from the received signals, determines their circumcenter to find the DC component, and subtracts it automatically. This self-contained approach improves measurement accuracy while minimizing the need for external processing resources or manual calibration.
Solution Approach 2:
The patent replaces complex physical DC removal hardware with computational methods. Instead of using hardware filters or analog circuits to remove DC components, the system uses digital signal processing algorithms that calculate the DC component from constellation points and subtract it mathematically. This substitution reduces hardware complexity and computing resource requirements while maintaining high measurement accuracy.
3Measurement precision
If radar system is designed for high precision displacement measurement, then measurement accuracy improves, but system size increases preventing miniaturization
Solution Approach 1:
The patent replaces bulky physical DC removal hardware with compact digital processing algorithms. By using computational methods to estimate and remove DC components from I and Q signals, the system achieves high displacement measurement accuracy without requiring large analog filter circuits or additional hardware components. This enables miniaturization of the radar system while maintaining precision measurement capabilities.
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
Enables efficient and accurate measurement of object displacement even in narrow spaces and with minimal computing resources, facilitating the miniaturization of biometric information acquisition systems.
Implementation Method 1
a radar measurement system... wherein the signal is reflected by the object after a transmission signal having a plurality of frequencies is emitted toward the object by the radar measurement system
Data Source
AI summary
A method and an apparatus for measuring a displacement of an object according to steps of: dividing a signal into an I signal and a Q signal according to a phase of the signal, wherein the signal is reflected by the object after a transmission signal having a plurality of frequencies is emitted toward the object by the radar measurement system; estimating a direct current (DC) component from an N-tuple information acquired from the I signal and the Q signal; removing the estimated DC component to correct the I signal and the Q signal; and measuring the displacement of the object based on the corrected I signal and Q signal are provided.