Apparatus and method for determining bio-information of target using impulse radar

Patent metadata

Field	Value
Publication number	US-10383545-B2
Application number	US-201615362873-A
Country	US
Kind code	B2
Filing date	Nov 29, 2016
Priority date	Sep 29, 2016
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

An apparatus and method for determining bio-information of a target using an impulse radar are provided. The method may include generating a frame set by accumulating frames received at preset time intervals, determining a first magnitude spectrum of the frame set corresponding to a first frequency axis by performing a frequency conversion of frames included in the frame set in a sampler index axis direction, determining a second magnitude spectrum of the frame set corresponding to the first frequency axis and a second frequency axis by performing a frequency conversion of the first magnitude spectrum in a time axis direction, determining a third magnitude spectrum of the frame set by adding up values of the second magnitude spectrum for each second frequency, and determining a frequency indicating a peak in the third magnitude spectrum as a heartbeat frequency of the target.

First claim

What is claimed is:

1. A method of determining bio-information of a target, the method comprising:
generating a frame set by accumulating frames received at preset time intervals, the frames being generated by overlapping of radar pulses reflected from a target of which a heart rate is to be measured;
determining a first magnitude spectrum of the frame set corresponding to a first frequency axis by performing a frequency conversion of frames included in the frame set in a sampler index axis direction;
determining a second magnitude spectrum of the frame set corresponding to the first frequency axis and a second frequency axis by performing a frequency conversion of the first magnitude spectrum in a time axis direction;
determining a third magnitude spectrum of the frame set by adding up values of the second magnitude spectrum in a second frequency axis direction; and
determining a frequency indicating a peak in the third magnitude spectrum as a heartbeat frequency of the target.

2. The method of claim 1 , further comprising:
filtering the first magnitude spectrum in the time axis direction using a band-pass filter (BPF) with a frequency band corresponding to the heartbeat frequency; and
applying a window function corresponding to a data length in the time axis direction to the filtered first magnitude spectrum,
wherein the determining of the second magnitude spectrum comprises determining the second magnitude spectrum by performing the frequency conversion of the first magnitude spectrum, to which the window function is applied, in the time axis direction.

Assignees

• Daegu Gyeongbuk Inst Science & Tech

Inventors

• Cho Hui Sup
• Park Young Jin

Classifications

• A61B5/024

  Measuring pulse rate or heart rate · CPC title

• G01S13/0209

  Systems with very large relative bandwidth, i.e. larger than 10 %, e.g. baseband, pulse, carrier-free, ultrawideband · CPC title

• A61B5/0816 Primary

  Measuring devices for examining respiratory frequency (measuring frequency of electric signals G01R23/00) · CPC title

• G01S13/88

  Radar or analogous systems specially adapted for specific applications (electromagnetic prospecting or detecting of objects, e.g. near-field detection, G01V3/00) · CPC title

• G01S13/53

  performing filtering on a single spectral line and associated with one or more range gates with a phase detector or a frequency mixer to extract the Doppler information, e.g. pulse Doppler radar {(G01S13/5244 takes precedence)} · CPC title