KR20060096837A - System for wireless sensing of eyes motion using circular polarization - Google Patents

Abstract

The present invention relates to an integrated wireless biometric sensing system using circular polarization. In the integrated wireless biometric sensing system using the circular polarization of the present invention, the source signal output from the dielectric oscillator is distributed to the first signal transmitted to the transmission antenna by the power divider and the second signal delivered to the mixer, and in the transmission antenna The radiated bio-sensing signal is received by the receiving antenna because its frequency characteristic is changed by the user's movement, and this bio-signal is input to the mixer through a low noise amplifier and then combined with the second signal and output as a signal of intermediate frequency. In addition, the intermediate frequency signal is output through the user terminal through the low pass filter, the amplifier, the band pass filter, and the analog / digital converter as a biometric detection result of the user's movement. In this way, by using an antenna having excellent polarization characteristics, the wireless biosensor system can be integrated and miniaturized and reduced in weight, making it portable and easy to install, and also having excellent sensitivity characteristics to detect minute biological signals. It can be applied to situation control system or security system used in home or office.

Circularly polarized patch antenna, biometric sensing system, frequency deflection compensation, separation characteristics

Description

Integrated Wireless Biometric Sensor System Using Circular Polarization {SYSTEM FOR WIRELESS SENSING OF EYES MOTION USING CIRCULAR POLARIZATION}

1 is a block diagram showing the configuration of a real-time heart rate wireless detection system using circular polarization according to an embodiment of the prior art.

2 is a block diagram showing the configuration of an integrated wireless biometric sensing system using circular polarization according to an embodiment of the present invention.

FIG. 3 illustrates in detail a transmission antenna and a reception antenna, which are components of FIG. 1.

Figure 4 shows an example of an actual implementation of an integrated wireless biometric sensing system using a circular polarization according to an embodiment of the present invention.

5 to 7 illustrate antenna characteristics of an integrated wireless biometric sensing system using circular polarization according to an exemplary embodiment of the present invention.

8 illustrates a result of detecting a waveform when the speaker vibrates with a sine wave, sawtooth wave, or square wave by using the similarity between the blinking of the eye and the vibration of the speaker due to the eye movement proposed in the present invention.

9 and 10 illustrate waveform detection results for a biosignal proposed in the present invention.

The present invention relates to an eye movement detection system using circular polarization, and more particularly, to an integrated wireless biometric detection system using circular polarization that can be miniaturized while compensating for frequency deflection using a circular polarized Doppler radar.

Recently, as telemedicine enters an early stage between doctors and patients, it is gradually spreading to be able to easily transfer and receive medical information of anywhere. Wireless biosignal detection systems are currently being used to measure heart and respiration.

Real-time heart rate wireless detection system using a circular polarization according to an embodiment of the prior art (Korean Patent Publication No. 2004-0027577), as shown in Figure 1, the oscillator 100, power divider 200, mixer ( 300, a transmit antenna 500, a receive antenna 600, and a baseband unit 700.

The oscillator 100 generates a signal of a specific frequency, the power divider 200 distributes the power of the signal generated by the oscillator 100, and the mixer 300 and the RF signal received through the receiving antenna 600 The frequency component of the second signal output from the power divider 200 is synthesized.

The transmit antenna 500 radiates the first signal output from the power divider 200 toward the chest of the patient, and the receive antenna 600 receives a signal that is shifted in frequency and reflected by the chest movement of the patient. The baseband unit 700 filters the synthesized signal from the mixer 300 and converts the signal into a digital signal for display on a monitor.

The real-time heartbeat wireless detection system using the circular polarization, and other eye movement sensors are too large and heavy to carry while actually carrying the system, and the circular polarization characteristics of the antenna are poor. Therefore, there is a problem that the characteristics of the polarization change in the feed portion.

Therefore, the real-time heart rate wireless detection system using the circular polarization according to the embodiment of the prior art, and other sensors related to eye movement, considering the polarization characteristics appearing when having a high dielectric constant and conductivity, such as the human body of the sensor due to the polarization loss There is a problem that the sensitivity is lowered.

The technical problem to be achieved by the present invention can compensate for the frequency deflection in consideration of the antenna polarization characteristics appearing at the time of miniaturization by using a portable and miniaturized and lightweight to carry out wireless bio-signal measurement anytime, anywhere, and excellent polarization characteristics It is to provide an integrated wireless biometric sensing system using a circular polarization.

In order to solve this problem, the present invention improves the circular polarization characteristics and compensates for the frequency deflection by using the circular polarization patch antenna, thereby enabling the integration and integration of each component of the system to manufacture a biometric sensing system with a small size and light weight. .

According to an aspect of the present invention, an integrated wireless biometric sensing system using a circular polarization includes a transmitting antenna radiating a biosensing signal to a user, and a biometric sensing signal reflected by a frequency shift from the transmitting antenna according to a user's movement. An integrated wireless biological sensing system using a circular polarization including a receiving antenna for receiving a signal, comprising: a dielectric oscillator for generating and outputting a source signal of a specific frequency; A power divider receiving a source signal from the dielectric oscillator and distributing power to a first signal and a second signal; A low noise amplifier for amplifying a biological signal transmitted from the receiving antenna; A mixer for synthesizing the frequency components of the biological signal amplified and transmitted through the low noise amplifier and the second signal transmitted from the power divider and outputting a signal having an intermediate frequency; A low pass filter for passing only necessary signals of low frequency components while suppressing high frequency noise in an intermediate frequency signal transmitted from the mixer; An amplifier for amplifying and outputting the signal passing through the low pass filter; A band pass filter for passing only a specific frequency band in the signal amplified and transmitted by the amplifier; And a signal output means for analog-to-digital converting the signal passing through the bandpass filter and outputting a biometric detection result of the user's movement.

It is preferable that an isolator is provided between the power divider and the mixer and the mixer and the low noise amplifier to block the reflection of the signal.

The transmitting antenna and the receiving antenna preferably use a circularly polarized patch antenna using a sequential rotation method in order to improve circularly polarized wave characteristics.

It is preferable that a via hole is provided between the transmitting antenna and the receiving antenna to increase the separation characteristic between the antennas.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

First, an integrated wireless biometric sensing system using circular polarization according to an embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4.

FIG. 2 is a block diagram illustrating a configuration of an integrated wireless biometric sensing system using circular polarization according to an exemplary embodiment of the present invention. FIG. 3 is a detailed view illustrating a transmitting antenna and a receiving antenna of some components of FIG. 1. 4 shows an example of an actual integrated implementation of an integrated wireless biometric sensing system using circular polarization according to an embodiment of the present invention.

2 to 4, the integrated wireless biometric sensing system using the circular polarization according to the embodiment of the present invention, a circular polarization patch antenna 7 using a sequential rotation method to improve the circular polarization characteristics (7) Transmit antenna (7a) and receive antenna (7b), dielectric oscillator (1), power divider (2), low noise amplifier (4), mixer (3), low pass filter (11), amplifier (12) And a signal output means composed of a band pass filter 13, an analog-to-digital converter 14, and an RS-232C 15, which is a serial communication means.

The transmitting antenna 7a radiates a biosensing signal to the user, and the receiving antenna 7b transmits an RF biosignal in which the biosensing signal is frequency shifted and reflected according to a user's movement, in particular, blinking and eye movement. Receive.

A via hole () is provided between the transmitting antenna 7a and the receiving antenna 7b to improve the separation characteristic between the antennas 7.

The dielectric oscillator 1 is low in phase noise and generates and outputs a source signal of 10 mu s. The power divider 2 distributes power between the 10 GHz source signal into the first signal and the second signal to supply power to the LO ports of the transmit antenna 7a and the mixer 3, respectively, so that the first signal is the transmit antenna. At 7a, the second signal is supplied to the mixer 3, respectively.

The low noise amplifier 4 outputs low noise amplified bio signals transmitted from the receiving antenna, and the mixer 3 outputs the frequencies of the bio signals transmitted through the low noise amplifier 4 and the second signal transmitted from the power divider 2. The components are synthesized to output a signal of intermediate frequency IF.

At this time, as shown in FIG. 4, an isolator 5 is installed to block the reflection of the signal between the power divider 2 and the mixer 3, the mixer 3, and the low noise amplifier 4. .

A low pass filter (LPF) 11 passes only necessary signals of low frequency components while suppressing high frequency noise in an intermediate frequency signal transmitted from the mixer 3, and the amplifier 12 passes the low pass filter 11. Amplify and output the signal which passed the signal.

The bandpass filter 13 passes only a specific frequency band in the signal amplified and transmitted by the amplifier 12 to deliver only the correct frequency band to the user terminal 20.

The analog-to-digital converter 14 converts the signal passing through the bandpass filter 13 into an analog / digital signal and outputs it as a biometric detection signal for a user's movement, and the RS-232C 15 is a user terminal 20. Is connected to the user to monitor the biometric detection signal output from the analog-to-digital converter (14).

In FIG. 4, reference numeral 8 denotes a bias supplied to the dielectric oscillator 1, and reference numerals 9 and 10 denote gate bias and drain bias supplied to the low noise amplifier 4. Represent each.

Next, the operation of the integrated wireless biometric sensing system using the circular polarization according to the embodiment of the present invention will be described in detail with reference to FIGS. 5 to 10.

5 to 7 illustrate antenna characteristics of an integrated wireless biometric sensing system using circular polarization according to an exemplary embodiment of the present invention. FIG. 8 illustrates a result of detecting a waveform when the speaker vibrates with a sine wave, sawtooth wave, or square wave by using the similarity between the blinking of the eye and the vibration of the speaker due to the eye movement proposed in the present invention. And FIG. 10 illustrates a waveform detection result for the biosignal proposed in the present invention.

5 to 7, the transmitting antenna 7a and the receiving antenna 7b are circularly polarized patch antennas, which have widened the bandwidth of the axial ratio and the return loss by using the sequence rotation method. 7a) and the receiving antenna 7b compensate for the frequency deflection that may appear in the feeding part of the antenna when the system is fabricated as a practical integrated module by using 10 kHz by the dielectric oscillator 1 as the center frequency. .

In addition, the via hole 6 is provided between the transmitting antenna 7a and the receiving antenna 7b to improve the separation characteristics, which shows better separation characteristics than when using a circulator. Can be.

The 10 GHz source signal output from the dielectric oscillator 1 is divided by the power divider 2 into a first signal and a second signal. At this time, the first signal is input to the transmit antenna 7a and the second signal is input to the LO port of the mixer.

The biosensing signal radiated from the transmitting antenna 7a is changed in frequency characteristics by the blinking of the user or by the movement of the pupil, and the shifted frequency is received by the receiving antenna 7b as a biosignal.

The biosignal is input to the mixer 3 via the low noise amplifier 4 and then synthesized with the second signal and output as a signal of intermediate frequency. The intermediate frequency signal is converted into a digital signal through a low pass filter (11), an amplifier (12), a band pass filter (13), and an analog-to-digital converter (14). As the detection detection signal is output through the user's terminal 20.

In this case, as shown in FIGS. 8 to 10, it can be seen that the bio signals for blinking of the eyes and movement of the eyes are similar to the shaking of the speaker.

Therefore, the integrated wireless biometric detection system using circular polarization with excellent sensitivity characteristics can detect minute biosignal such as eye movement, so it can be applied to situational control system for the disabled or wireless security system in home or other offices. Can be.

For example, the integrated wireless biometric sensing system using the circular polarization according to an embodiment of the present invention can be installed on the monitor on the user's computer to detect the movement of the eye to control the computer through the movement of the eye instead of the mouse. .

The integrated wireless biometric sensing system using the circular polarization according to the embodiment of the present invention compensates for the frequency deflection that may appear during miniaturization while operating as a wireless sensing sensor having a circular polarization characteristic, and manufactured to a size of 95 × 50 × 13㎣. Can be easily carried and installed anywhere.

In particular, the integrated wireless biometric detection system using the circular polarization according to an embodiment of the present invention controls the object control system and the button-type security lock device in a situation where it is inconvenient to use a hand such as a physically handicapped person by only blinking eyes or movement of the eyes. It can be applied to security systems that can.

Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited thereto, and various other changes and modifications are possible.

As described above, the integrated wireless biometric sensing system using the circular polarization according to the present invention has an effect of being portable and easy to install by miniaturizing and reducing the weight of the wireless biometric sensing system using an antenna having excellent polarization characteristics.

In addition, the integrated wireless biometric detection system using the circular polarization according to the present invention has excellent sensitivity characteristics and can detect even minute biosignals, so that it can be applied to a situation control system for a disabled person or a security system used at home or office. .

Claims (7)

Integrated wireless biometric sensing using circular polarization including a transmitting antenna radiating a biosensing signal to a user and a receiving antenna receiving a biosignal reflected by frequency shift of the biosensing signal according to a user's movement In the system, A dielectric oscillator for generating and outputting a source signal of a specific frequency; A power divider receiving a source signal from the dielectric oscillator and distributing power to a first signal and a second signal; A low noise amplifier for amplifying a biological signal transmitted from the receiving antenna; A mixer for synthesizing the frequency components of the biological signal amplified and transmitted through the low noise amplifier and the second signal transmitted from the power divider and outputting a signal having an intermediate frequency; A low pass filter for passing only necessary signals of low frequency components while suppressing high frequency noise in an intermediate frequency signal transmitted from the mixer; An amplifier for amplifying and outputting the signal passing through the low pass filter; A band pass filter for passing only a specific frequency band in the signal amplified and transmitted by the amplifier; Signal output means for outputting a biometric detection result of the user's movement by analog / digital conversion of the signal passing through the band pass filter Integrated wireless biometric sensing system using a circular polarization comprising a. The method of claim 1, The integrated wireless biometric sensing system using circular polarization, the power divider and mixer, isolator is provided between the mixer and the low noise amplifier to block the reflection of the signal. The method of claim 1, The transmitting antenna and the receiving antenna are integrated wireless biometric sensing system using circular polarization using a circular polarization patch antenna using a sequential rotation method to improve circular polarization characteristics. The method of claim 1, The integrated wireless biometric sensing system using circular polarization, wherein the first signal of the power splitter is transmitted to the transmitting antenna. The method of claim 1, Integrated wireless biometric sensing system using a circular polarization is provided with a via hole for improving the separation characteristics between the antenna between the transmitting antenna and the receiving antenna. The method of claim 1, The receiving antenna is an integrated wireless biometric sensing system using circular polarization that detects a frequency characteristic that is changed by the blinking of the user's eyes or the movement of the pupil and transmits the RF signal to the low noise amplifier as a biosignal of RF. The method of claim 1, The signal output means, An analog / digital converter configured to analog-digital convert the signal passing through the bandpass filter and output the signal as a biometric detection signal for a user's movement; And Serial communication means connected to the user's terminal for transmitting to the user to monitor the biometric detection signal output from the analog / digital converter Integrated wireless biometric sensing system using circular polarization.

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