KR20180037528A - A bio-information determination apparatus and method of a target using an impulse radar - Google Patents

Abstract

Disclosed are an apparatus and a method for determining bio-information of a target using an impulse radar. The method comprises the steps of: generating a frame set by accumulating a single frame in which a radar pulse reflected from a target for measuring a heart rate is overlapped according to a predetermined reception time; removing a portion where a transition section is generated by a motion of the target from the generated frame set; and determining a heart rate frequency of the target using the frame set from which the transition set generated due to the motion of the target is removed. The radar pulse reflected from the target may be a radar signal reflecting the motion of the target.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for determining biological information of a target using an impulse radar,

The present invention relates to an apparatus and a method for determining a biological information of a target using an impulse radar, and more particularly, to a method and apparatus for determining a biological information of a target using an impulse radar, And determining the biometric information of the target.

Radar technology has been used to detect distant targets in aeronautical and military applications, or to measure distances to targets. In recent years, attempts have been made to acquire biometric information such as pulse, heartbeat, and respiration from a person located near by using radar technology.

An impulse radar and a CW Doppler radar may be used as a radar technique for acquiring biometric information of a person. These two types of radar technology have different application areas because of differences in power consumption, target detection distance, and spatial resolution.

Among them, UWB (Ultra Wide Band) impulse radar has advantages of low risk of overexposure of electromagnetic wave and low power consumption when used in human body. In addition, the UWB impulse radar has excellent characteristics in terms of coexistence with peripheral devices, and is superior in spatial resolution compared to other methods, and can be considered as a method suitable for acquiring human biometric information.

However, the fatal disadvantage of using UWB impulse radars as a way of acquiring human biometric information is that the target is vulnerable to unintentional sudden movements. The motion artifact caused by such motion causes a problem that the information of the heartbeat and respiration is distorted or lost. Therefore, there is a need to solve this problem.

The present invention minimizes the influence of unintended movement of a target by removing a single frame of a portion of a plurality of single frames derived through a radar pulse reflected from the target, An apparatus and a method for extracting a sample are provided.

A method of determining a biometric information of a target according to an embodiment of the present invention includes generating a frame set by accumulating a single frame in which radar pulses reflected from a target for measuring a heartbeat are superimposed according to a predetermined reception time ; Removing a portion of the generated frame set where a transition section is generated by the movement of the target; And determining a heart rate frequency of the target using a frame set from which a transition section has been removed by the motion of the target, wherein the radar pulse reflected from the target is a radar signal reflected from the target, .

Wherein the step of removing the transition section comprises: extracting a first sampler index representing a maximum peak for each of the single frames included in the frame set; Determining a sampler index corresponding to a largest peak among the first sampler indices indicating the maximum peak as a second sampler index indicating a reference for generating a motion profile; Generating a motion profile based on the motion of the target using the difference between the first sampler index and the second sampler index; And aligning the single frames included in the frame set using the motion profile.

Wherein aligning the frame comprises using the motion profile to adjust a maximum peak of single frames included in the frameset to match a maximum peak indicated by a first sampler index; And removing the single frames in which the transition interval has occurred due to the motion of the target.

In the step of determining the heart rate of the target, a Lomb-Scargle Periodogram may be applied to extract a periodic component using a frame set from which the transition section is removed.

A method of determining a biometric information of a target according to an embodiment of the present invention includes generating a frame set by accumulating a single frame in which radar pulses reflected from a target for measuring a heartbeat are superimposed according to a predetermined reception time ; Determining a magnitude spectrum of the frame set corresponding to a frequency axis by frequency-transforming a single frame included in the frame set according to a sampler index axis direction; Removing a portion in which the motion of the target occurs in the magnitude spectrum; And determining a heart rate frequency of the target using a magnitude spectrum from which the motion of the target has been removed. The radar pulse reflected from the target may be a radar signal reflecting the motion of the target.

The step of removing the motion-generated portion of the target comprises: extracting a first sampler index representing a maximum peak for each of the single frames included in the frame set; Determining a sampler index corresponding to a largest peak among the first sampler indices indicating the maximum peak as a second sampler index indicating a reference for generating a motion profile; Generating a motion profile based on the motion of the target using the difference between the first sampler index and the second sampler index; And removing the motion-generated portion of the target based on the generated motion profile

The step of determining the heart rate frequency of the target may include applying a Lomb-Scargle Periodogram to extract a periodic component using the magnitude spectrum.

A target biometric information determination apparatus according to an embodiment of the present invention includes a processor for signal processing a single frame in which radar pulses reflected from a target for measuring a heartbeat are superimposed, Accumulating a single frame in which the reflected radar pulses are superimposed according to a predetermined reception time to generate a frame set and removing a portion in which the transition section is generated by the motion of the target in the generated frame set, A heart rate frequency of the target is determined using a frame set from which a portion in which a transition section has been generated by the movement of the target is removed and a radar pulse reflected from the target may be a radar signal reflecting movement of the target.

Wherein the processor extracts a first sampler index representing a maximum peak for each of the single frames included in the frame set and outputs a sampler index corresponding to the largest peak among the first sampler indices representing the maximum peak to a motion profile And generating a motion profile based on the motion of the target using the difference between the first sampler index and the second sampler index, and generating a motion profile based on the motion profile, You can sort the single frames contained in the set.

Wherein the processor adjusts the maximum peak of the single frames included in the frame set to match the maximum peak indicated by the first sampler index using the motion profile and removes single frames in which the transition interval is generated by the motion of the target can do.

The processor may determine a heart rate frequency of the target by applying a Lomb-Scargle Periodogram to extract a periodic component using a frame set from which the transition section has been removed.

A target biometric information determination apparatus according to an embodiment of the present invention includes a processor for signal processing a single frame in which radar pulses reflected from a target for measuring a heartbeat are superimposed, A frame set is generated by accumulating a single frame in which the reflected radar pulses are superimposed according to a predetermined reception time, and a single frame included in the frame set is frequency-converted according to a sampled index axis direction to correspond to a frequency axis The magnitude spectrum of the frame set is removed, a portion in which the motion of the target is generated in the magnitude spectrum is removed, and a magnitude spectrum of the target in the magnitude spectrum is removed using the magnitude spectrum, Determines the heart rate frequency, and the radar pulse reflected from the target And may be a radar signal reflecting the motion of the target.

Wherein the processor extracts a first sampler index representing a maximum peak for each of the single frames included in the frame set and outputs a sampler index corresponding to the largest peak among the first sampler indices representing the maximum peak to a motion profile And generating a motion profile based on the motion of the target using the difference between the first sampler index and the second sampler index, and based on the generated motion profile, The portion where the motion of the target is generated can be removed.

The processor may determine a heart rate frequency of the target by applying a Lomb-Scargle Periodogram to extract a periodic component using the magnitude spectrum.

According to an embodiment of the present invention, by removing a single frame of a portion in which a motion of a target is generated among a plurality of single frames derived through a radar pulse reflected from the target to minimize the influence of unintended movement of the target, It is possible to robustly extract the biometric information of the user.

1 is a diagram illustrating a system for determining a heart rate of a target using an impulse radar according to an embodiment of the present invention.
2 is a diagram illustrating a method of generating a frame set according to an embodiment of the present invention.
3 is a flowchart showing a method of determining a heart rate frequency of a target using an impulse radar according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating a comparison of a frame set according to an exemplary embodiment of the present invention with and without motion of a target.
5 is a diagram illustrating an example of a motion profile according to an embodiment of the present invention.
6 is a diagram illustrating a result of applying a periodogram according to an embodiment of the present invention.

It is to be understood that the specific structural or functional descriptions of embodiments of the present invention disclosed herein are presented for the purpose of describing embodiments only in accordance with the concepts of the present invention, May be embodied in various forms and are not limited to the embodiments described herein.

Embodiments in accordance with the concepts of the present invention are capable of various modifications and may take various forms, so that the embodiments are illustrated in the drawings and described in detail herein. However, it is not intended to limit the embodiments according to the concepts of the present invention to the specific disclosure forms, but includes changes, equivalents, or alternatives falling within the spirit and scope of the present invention.

The terms first, second, or the like may be used to describe various elements, but the elements should not be limited by the terms. The terms may be named for the purpose of distinguishing one element from another, for example without departing from the scope of the right according to the concept of the present invention, the first element being referred to as the second element, Similarly, the second component may also be referred to as the first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Expressions that describe the relationship between components, for example, "between" and "immediately" or "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises ", or" having ", and the like, are used to specify one or more of the features, numbers, steps, operations, elements, But do not preclude the presence or addition of steps, operations, elements, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, the scope of the patent application is not limited or limited by these embodiments. Like reference symbols in the drawings denote like elements.

1 is a diagram illustrating a system for determining a heart rate of a target using an impulse radar according to an embodiment of the present invention.

In order to determine the heart rate frequency of the target 110, the bio-information determination apparatus 100 may project a radar signal toward a direction in which the target 110 is positioned using a transmission antenna. At this time, the transmission radar signal projected through the transmission antenna may be a pulse-shaped radar signal. Specifically, the transmitted radar signal may be a UWB impulse-shaped radar signal with low risk to the human body and low power consumption. At this time, a frequency characteristic such as a center frequency and a bandwidth of a UWB impulse type radar signal projected through the biological information determination apparatus 100 is defined as a standard.

The bio-information determination apparatus 100 may then determine the heart rate frequency of the target 110 using the received radar signal that is reflected from the target 110 and collected via the receive antenna.

In the prior art, a method of determining the heart rate frequency of the target 110 using the received radar signal is provided, but when the unintentional sudden movement of the target 110 occurs, it is difficult to determine the correct heart rate frequency .

Even when the distance between the radar antenna and the target 110 changes due to unexpected sudden movement of the target 110 in this way, the influence of the distance on the target 110 can be minimized, And provides a method for robustly determining the heart rate frequency.

2 is a diagram illustrating a method of generating a frame set according to an embodiment of the present invention.

The transmission radar signal projected from the biological information determination apparatus 100 may be in the form of a pulse whose width is extremely narrow on the time axis as shown in FIG. The biological information determination apparatus 100 can project the transmission radar signal of this type to the target at a constant time interval using the transmission antenna.

The biometric information determination apparatus 100 can collect the radar signal reflected from the target 110 using the receiving antenna. At this time, the biological information determination apparatus 100 may collect the reception radar signal through the reception antenna according to a predetermined time. The received radar signal collected via the receive antenna may be a signal in the form of a superposition of multiple radar pulses.

The biological information determination apparatus 100 may convert the reception radar signal collected through the reception antenna into digital data. At this time, the receiving radar signal collected through the receiving antenna can be converted into digital data by being sampled using a plurality of samplers. In the present invention, a receiving radar signal converted into digital data is referred to as a frame.

FIG. 2 (b) shows the shape of a single frame in the present invention. In this case, the sampler index axis corresponding to the horizontal axis represents the number of each sampler index, and the signal amplitude axis corresponding to the vertical axis represents the voltage of the radar signal collected through the receiving antenna. At this time, each sampler index number may be proportional to the distance from the radar antenna to the target 110. For example, the larger the sampler index number, the greater the distance from the radar antenna to the target 110.

The biometric information determination apparatus 100 may generate and use a frame set in which a plurality of single frames are accumulated in accordance with the flow of time in order to efficiently extract the heart rate frequency of the target 110 from the received radar signal. At this time, a plurality of single frames to be accumulated can be used in units of n power of 2, such as 512, 1024, and so on.

Specifically, FIG. 2C shows a form of a frame set in the present invention. The frame set has a form in which the size of the received radar signal is expressed on a plane formed by the sampled index axis and the time axis. That is, the frame set can be represented by a data structure of a two-dimensional matrix.

For example, suppose that the biometric information determination apparatus 100 supports 256 samplers. The sampler index axis of the frameset can then be composed of 256. And that the bioinformation determination apparatus 100 acquires 512 reception radar signals at 20 ms intervals. Then, since a single frame collected every 20ms interval accumulates in the time axis direction to constitute a frame set, the time axis is composed of 512 unit time (0.02 second), and one frame set is generated by receiving radar signal collected for 10.24 seconds . Such a frame set is not limited to the above example, but may be changed into various values according to needs and uses.

The frame set generated through the biometric information determination apparatus 100 includes biometric information of the target 110. Particularly, the data showing the largest fluctuation among the data in the time axis direction included in the frame set represents information about respiration of the target 110. That is, as shown in FIG. 2 (c), a large fluctuation appearing on the data in the time axis direction of the 138th sampler is caused by the fluctuation of the phase of the received radar signal due to the respiration of the target 110 .

On the other hand, a ripple appearing in a small size on the data in the time axis direction of almost all samplers represents information about the heartbeat of the target 110. [ The biometric information determination apparatus 100 of the present invention can extract information on the heartbeat and respiration of the target 110 by processing the data in the time axis direction in the time domain or the frequency domain.

At this time, the biometric information determination apparatus 100 of the present invention provides a method of determining a heart rate frequency of a target 110 in terms of a time domain side and a frequency domain side using a frame set.

First embodiment: < Determining the heart rate frequency of the target in terms of time domain >

3 is a flowchart showing a method of determining a heart rate frequency of a target using an impulse radar according to an embodiment of the present invention.

In step 310, the biometric information determination apparatus 100 may generate a frame set by accumulating a single frame in which radar pulses reflected from a target for measuring a heartbeat are superimposed according to a predetermined reception time .

At this time, the generated frame set has a form in which the size of the received radar signal is expressed on the plane formed by the sampled index axis and the time axis. That is, the frame set can be represented by a data structure of a two-dimensional matrix.

In operation 320, the biometric information determination apparatus 100 may remove a portion where a transition section is generated due to the motion of the target in the generated frame set.

First, a frame set according to whether there is a motion of a target or not can be compared through FIG. For example, FIG. 4A is a top view of a frame set when there is no target movement, FIG. 4B is a top view of a frame set when there is a target movement, . Referring to FIG. 4 (b), the data of about 2.5 to 4.7 seconds may be distorted to the left or right due to the motion of the target.

4C and 4D show data in the time axis direction of the 142 sampler in the frame set of FIGS. 4A and 4B, respectively. The ripple shown in FIG. 4 (c) shows that the phase of the received radar signal due to the heartbeat of the target 110 varies with the passage of time.

The biometric information determination apparatus 100 can accurately extract the heartbeat frequency of the target 110 by processing the data in the time axis direction in the time domain or the frequency domain. That is, all the frames in the frame set must be aligned along the time axis to enable additional data processing. However, if frames are not aligned as shown in FIG. 4 (b), data in the time axis direction as shown in FIG. 4 (d) can be collected, a transition of data in a specific interval exists, Can act as an element to distort information about the heartbeat of heart 110.

Therefore, the biometric information determination apparatus 100 can minimize the influence of the unintended movement of the target 110 and clarify the section in which the movement occurs in order to detect the heart rate frequency of the target 110. [ At this time, the motion of the target 110 can be reflected by a sampler index at which a maximum peak occurs in the frame set. The position at which the maximum peak occurs in the frame set may vary depending on the distance from the radar antenna to the target 110. [ For example, the sampler index may increase for a target 110 at a distance from the radar antenna. Therefore, by observing the position of the sampler index where the maximum peak occurs in the frame set, it is possible to relatively accurately quantify how much the target 110 is moving.

Specifically, the bioinformation determining apparatus 100 may extract a first sampler index indicating a maximum peak for each of the single frames included in the frame set as shown in FIG. 2 (c). Then, the bio-information determination apparatus 100 may determine a sampler index corresponding to the largest peak among the first sampler indices indicating the maximum peak as a second sampler index indicating a reference for generating a motion profile. For example, in FIG. 2 (c), it can be seen that the maximum peak in the frame set appears most frequently in the 138 sampler. At this time, the biometric information determination apparatus 100 may determine the second sampler index using the histogram of the extracted first sampler indices.

The biological information determination apparatus 100 may generate a motion profile based on the motion of the target 110 using the difference between the first sampler index and the second sampler index. For example, FIGS. 5A and 5B show an example in which a motion profile is generated using a difference between a first sampler index and a second sampler index. 5 (a), it can be seen that the movement of the target 110 occurs in a period of about 2.77 to 3.51 seconds, and FIG. 5 (b) shows the movement of the target 110 in about 4.07 to 4.41 seconds and about It can be seen that the movement of the target 110 occurred in the interval of 5.91 to 6.40 seconds.

Thereafter, the biometric information determination apparatus 100 can align the single frames included in the frame set using the generated motion profile. Specifically, the bioinformation determining apparatus 100 adjusts the maximum peak of the single frames included in the frame set to the maximum peak indicated by the first sampler index using the motion profile, The generated single frames can be removed.

For example, in (a) of FIG. 5, since the movement of the target 110 occurs in a period of about 2.77 to 3.51 seconds, all the single frames corresponding to the corresponding period can be removed. 5B, single frames corresponding to a period of about 4.07 to 4.41 seconds and a period of about 5.91 to 6.40 seconds in which the movement of the target 110 occurs can be removed. However, in a period of about 4.41 to 5.91 seconds t1, And the single frames corresponding to the interval t2 of about 6.4 to 10.24 seconds should not be removed since the target 110 does not move.

Therefore, the bioinformation determining apparatus 100 determines that the maximum peak of the frames corresponding to the t1 section and the t2 section in which the movement of the target 110 does not occur is aligned with the maximum peak indicated by the second sampler index, 1 &quot; in the sampled index axis direction.

In this way, the frame set reconstructed by the bio-information determination apparatus 100 may be an incomplete frame set in which single frames in which the transition period is generated due to the motion of the target 110 are removed and the data is empty.

In step 330, the biometric information determination apparatus 100 may determine a heart rate frequency of the target 110 using a frame set from which single frames in which a transition period has been generated due to motion of the target are removed.

Since the reconstructed frame set through step 320 is an incomplete frame set in which the single frames in which the transition section is generated are empty and the data is empty, a statistical procedure is required to measure the accurate heart rate frequency of the target 110 .

The reconstructed frame set can be regarded as equally sampled incomplete data. Therefore, in order to detect a weak frequency component inherent in such incomplete data, the biological information determination apparatus 100 can apply the Lomb-Scargle Periodogram to the incomplete data in a mathematical process. The Lomb-Scargle Periodogram is a type of modified power spectral density that provides a method to detect periodic patterns with high efficiency and accuracy even when periodic components are obscured by noise.

Specifically, the Lomb-Scargle Periodogram is shown in Equation 1 below.

[Equation 1]

For a set of N data points X _j = X (t _j ) at times t _j where j = 1,?, N, the Lomb-Scargle normalized periodogram at frequency f is defined as

and

are the mean and variance of X(tj), respectively, given bywhere w = 2pf,

and

are the mean and variance of X (tj), respectively, given by

and the time offset is defined by

That is, the data (X _j ) in the time axis direction of the sampler index in which the maximum peak is generated in the reconstructed frame set can be composed of 512 pieces. At this time, the data (X _j ) in the time axis direction composed of 512 bits also includes an empty period corresponding to the removed single frames. Since 512 pieces of data (X _j ) in the time axis direction are constituted in total, N is 512, which is substituted into Equation 1 and the result is as shown in FIG. 6. At this time, as shown in FIG. 6, the heart rate frequency of the target 110 obtained from the reconstructed frame set, which is the incomplete data about 1.61 Hz which is the frequency at which the peak component appears, can be obtained.

Second Embodiment < Determination of heart rate frequency of target in frequency domain >

The bio-information determination apparatus 100 uses a frame set generated by accumulating a single frame in which radar pulses reflected from a target 110 to be measured a heartbeat are superimposed according to a predetermined reception time, Can be determined. At this time, the biometric information determination apparatus 100 can determine the heart rate frequency of the target 110 by processing the frame set in the frequency domain rather than the time domain, unlike the first embodiment.

First, the biometric information determination apparatus 100 may extract a first sampler index indicating a maximum peak for each of the single frames included in the frame set as shown in FIG. 2 (c). Then, the bio-information determination apparatus 100 may determine a sampler index corresponding to the largest peak among the first sampler indices indicating the maximum peak as a second sampler index indicating a reference for generating a motion profile. For example, in FIG. 2 (c), it can be seen that the maximum peak in the frame set appears most frequently in the 138 sampler. At this time, the biometric information determination apparatus 100 may determine the second sampler index using the histogram of the extracted first sampler indices.

The biological information determination apparatus 100 may generate a motion profile based on the motion of the target 110 using the difference between the first sampler index and the second sampler index. For example, FIGS. 5A and 5B show an example in which a motion profile is generated using a difference between a first sampler index and a second sampler index. 5 (a), it can be seen that the movement of the target 110 occurs in a period of about 2.77 to 3.51 seconds, and FIG. 5 (b) shows the movement of the target 110 in about 4.07 to 4.41 seconds and about It can be seen that the movement of the target 110 occurred in the interval of 5.91 to 6.40 seconds.

Then, the bio-information determination apparatus 100 may frequency-transform the single frames included in the frame set along the sampled index axis direction to determine a magnitude spectrum of the frame set corresponding to the frequency axis. At this time, even if motion of the target 110 occurs, the influence of the determined size spectrum can be minimized.

Next, the biometric information determination apparatus 100 can remove a portion where the motion of the magnitude spectrum target 110 of the frame set occurs using the generated motion profile. For example, in FIG. 5 (a), since the movement of the target 110 occurs in a period of about 2.77 to 3.51 seconds, the biological information determination apparatus 100 can remove all the size spectra corresponding to the corresponding interval. Similarly, in FIG. 5B, since the movement of the target 110 occurs in the interval of about 4.07 to 4.41 seconds and the interval of about 5.91 to 6.40 seconds, the biological information determining apparatus 100 removes all the size spectra corresponding to the corresponding interval .

The biometric information determination apparatus 100 can determine the heart rate frequency of the target 110 using the magnitude spectrum from which the portion in which the motion of the target is removed, as described above. Specifically, the bio-information determination apparatus 100 applies a Lomb-Scargle Periodogram to a data in a time axis direction having a frequency at which a maximum peak is generated among a magnitude spectrum from which a motion of a target of the target 110 is removed, can do. The Lomb-Scargle Periodogram is a type of modified power spectral density that provides a method to detect periodic patterns with high efficiency and accuracy even when periodic components are obscured by noise.

As in the time domain, the biometric information determination apparatus 100 can obtain the result shown in FIG. 6 by applying the Lomb-Scargle periodogram to the magnitude spectrum, and the heartbeat frequency of the target 110 is about 1.61 Hz, .

As described above, the biometric information determination apparatus 100 of the present invention can efficiently determine the human biometric information, in particular, the heartbeat frequency, by using the UWB impulse radar. In particular, the biometric information determination apparatus 100 removes a portion where a transition section is generated due to the movement of the target when unintentional sudden movement of the target 110 occurs, and applies a Lomb-Scargle Periodogram to the incomplete data that has been removed The biometric information of the target 110 can be efficiently extracted more accurately and robustly.

The apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components. For example, the apparatus and components described in the embodiments may be implemented within a computer system, such as, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA) , A programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For ease of understanding, the processing apparatus may be described as being used singly, but those skilled in the art will recognize that the processing apparatus may have a plurality of processing elements and / As shown in FIG. For example, the processing unit may comprise a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of the foregoing, and may be configured to configure the processing device to operate as desired or to process it collectively or collectively Device can be commanded. The software and / or data may be in the form of any type of machine, component, physical device, virtual equipment, computer storage media, or device , Or may be permanently or temporarily embodied in a transmitted signal wave. The software may be distributed over a networked computer system and stored or executed in a distributed manner. The software and data may be stored on one or more computer readable recording media.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks, and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI &gt; or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

100: Biometric information determination device
110: Target

Claims (14)

Generating a frame set by accumulating a single frame in which radar pulses reflected from a target for measuring a heartbeat are superposed according to a predetermined reception time;
Removing a portion of the generated frame set where a transition section is generated by the movement of the target; And
Determining a heart rate frequency of the target using a frame set from which a transition section has been removed by the movement of the target,
Lt; / RTI &gt;
Wherein the radar pulse reflected from the target,
And a radar signal reflecting the motion of the target. The method according to claim 1,
The step of removing a portion where the transition section is generated includes:
Extracting a first sampler index representing a maximum peak for each of the single frames included in the frame set;
Determining a sampler index corresponding to a largest peak among the first sampler indices indicating the maximum peak as a second sampler index indicating a reference for generating a motion profile;
Generating a motion profile based on the motion of the target using the difference between the first sampler index and the second sampler index;
Aligning the single frames included in the frame set using the motion profile
And determining the biometric information of the target. 3. The method of claim 2,
The step of aligning the frame comprises:
Adjusting the maximum peak of the single frames included in the frame set to the maximum peak indicated by the first sampler index using the motion profile; And
Removing a single frame in which a transition section is generated by the motion of the target
And determining the biometric information of the target. The method according to claim 1,
Wherein determining the heart rate frequency of the target comprises:
Wherein a Lomb-Scargle Periodogram is applied to extract a periodic component using a frame set from which the transition section has been removed. Generating a frame set by accumulating a single frame in which radar pulses reflected from a target for measuring a heartbeat are superposed according to a predetermined reception time;
Determining a magnitude spectrum of the frame set corresponding to a frequency axis by frequency-transforming a single frame included in the frame set according to a sampler index axis direction;
Removing a portion in which the motion of the target occurs in the magnitude spectrum; And
Determining a heart rate frequency of the target using a magnitude spectrum from which the motion of the target has been removed;
Lt; / RTI &gt;
Wherein the radar pulse reflected from the target,
And a radar signal reflecting the motion of the target. 6. The method of claim 5,
Wherein the step of removing a portion in which the motion of the target is generated includes:
Extracting a first sampler index representing a maximum peak for each of the single frames included in the frame set;
Determining a sampler index corresponding to a largest peak among the first sampler indices indicating the maximum peak as a second sampler index indicating a reference for generating a motion profile;
Generating a motion profile based on the motion of the target using the difference between the first sampler index and the second sampler index; And
Removing the motion-generated portion of the target based on the generated motion profile
And determining the biometric information of the target. 6. The method of claim 5,
Wherein determining the heart rate frequency of the target comprises:
And a Lomb-Scargle Periodogram is applied to extract periodic components using the magnitude spectrum. A processor for processing a single frame in which radar pulses reflected from a target for measuring heartbeats are superimposed
Lt; / RTI &gt;
The processor comprising:
A frame set is generated by accumulating a single frame in which radar pulses reflected from a target for measuring heartbeat are superposed according to a predetermined reception time, and a transition section is generated by the motion of the target in the generated frame set Determining a heart rate frequency of the target using a frame set in which a portion where a transition section is generated due to the movement of the target is removed,
Wherein the radar pulse reflected from the target,
Wherein the radar signal is a radar signal reflecting the motion of the target. 9. The method of claim 8,
The processor comprising:
Extracting a first sampler index representing a maximum peak for each of the single frames included in the frame set and generating a sampler index corresponding to the largest peak among the first sampler indices indicating the maximum peak, And generating a motion profile based on the motion of the target using the difference between the first sampler index and the second sampler index and adding the motion profile to the frame set using the motion profile Wherein the biometric information determination unit aligns the single frames. 10. The method of claim 9,
The processor comprising:
And adjusting a maximum peak of a single frame included in the frame set to a maximum peak indicated by the first sampler index using the motion profile and removing a single frame in which a transition interval is generated by the motion of the target Biometric information determination device. 9. The method of claim 8,
The processor comprising:
Wherein the heartbeat frequency of the target is determined by applying a Lomb-Scargle Periodogram to extract a periodic component using a frame set from which the transition section is removed. A processor for processing a single frame in which radar pulses reflected from a target for measuring heartbeats are superimposed
Lt; / RTI &gt;
The processor comprising:
A method of generating a frame set by accumulating a single frame in which a radar pulse reflected from a target for measuring heartbeat is superimposed according to a predetermined reception time and generating a single frame included in the frame set along a sampled index axis direction Frequency conversion to determine a magnitude spectrum of the frame set corresponding to a frequency axis, removes a portion in which the motion of the target is generated in the magnitude spectrum, Determining a heart rate frequency of the target using a spectrum,
Wherein the radar pulse reflected from the target,
Wherein the radar signal is a radar signal reflecting the motion of the target. 13. The method of claim 12,
The processor comprising:
Extracting a first sampler index representing a maximum peak for each of the single frames included in the frame set and generating a sampler index corresponding to the largest peak among the first sampler indices indicating the maximum peak, Generating a motion profile based on the motion of the target using the difference between the first sampler index and the second sampler index, and determining a motion vector of the target based on the generated motion profile, And removes a portion where the motion has occurred. 13. The method of claim 12,
The processor comprising:
Wherein the heartbeat frequency of the target is determined by applying a Lomb-Scargle Periodogram to extract a periodic component using the magnitude spectrum.

Images