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Related Experiment Video

Updated: May 14, 2026

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

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Non-contact displacement estimation using Doppler radar.

Xiaomeng Gao¹, Aditya Singh, Ehsan Yavari

¹Electrical Engineering Department, University of Hawaii at Manoa, Honolulu 96822, USA. gaoxiaom@hawaii.edu

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|February 1, 2013

Summary

This summary is machine-generated.

Non-contact Doppler radar accurately measures physiological motion, achieving 30 µm precision for chest displacement. This advancement enables enhanced cardiopulmonary monitoring by precisely assessing small movements.

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Area of Science:

Biomedical Engineering
Radar Systems
Physiological Monitoring

Background:

Non-contact Doppler radar is widely used for detecting physiological motion, primarily for estimating respiratory and heart rates.
Existing methods often focus on rate estimation, with less emphasis on precise displacement measurements.

Purpose of the Study:

To achieve highly accurate absolute chest displacement measurements using non-contact Doppler radar.
To explore the potential for estimating cardiopulmonary volumes and pulse pressure from precise displacement data.

Main Methods:

Employed full nonlinear phase demodulation of quadrature radar outputs for precise displacement estimation.
Utilized a calibration method involving relatively large motion to improve accuracy for smaller displacements.
Addressed limitations such as drifting RF power, DC offset, and channel quadrature imbalance.

Main Results:

Demonstrated the capability to acquire smaller motion displacements with an accuracy of approximately 30 µm.
Showcased a novel calibration technique that enhances the precision of radar-based displacement measurements.

Conclusions:

Accurate chest displacement measurement using non-contact Doppler radar is feasible with advanced demodulation techniques.
This precise measurement capability opens new avenues for advanced cardiopulmonary monitoring and diagnostics.