KR101556728B1 - Illumination control device and method thereof - Google Patents

Abstract

The object of the present invention is to provide a distance sensor to a lighting device to measure the distance to the user and control the illuminance according to the distance to provide as much illuminance as necessary. To achieve the above object, there is provided an illuminating device for controlling illuminance by measuring a distance to a user using a radio signal, the illuminating device comprising: a light source for generating a first signal, which is a radio signal whose frequency changes in a triangular shape with a predetermined slope with respect to time; An antenna unit for transmitting the first signal to the user and receiving a second signal that is a reflected wave of the first signal and a frequency difference calculating unit for calculating a frequency difference between the first signal and the second signal, An operation unit for generating distance information to the user based on the frequency difference information and the frequency slope information of the triangular signal; And a lighting controller for controlling the illuminance of the LED according to the distance information.

Description

[0001] Illumination control device and method [0002]

The present invention relates to a lighting apparatus and method for measuring a distance to a user and performing illumination control according to distance.

Conventional lighting control devices and methods have been for the user to control the switch to operate the lighting. Then, a sensor and a method of attaching the sensor to the lighting device and operating the lighting device by recognizing the approach of the person are used.

However, the method using such a sensor turns on or off the illumination according to the user's approach. As the user approaches the illuminating device, the illumination is turned on so that when the user approaches the illuminating device, There is a problem that unnecessary energy consumption occurs.

In addition, a conventional distance measuring sensor receives a reflected wave from an object, converts it into a digital signal, and then Fourier transforms it to obtain the magnitude of each frequency band component, and calculates the distance to the object. However, according to the related art, there is a problem that a distance measuring apparatus becomes large and a cost is increased because a device for converting a received signal into a digital signal and then converting a digital signal to a high speed is required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a distance sensor to a lighting device to measure the distance to a user and to control the illuminance according to the distance to provide as much illuminance as necessary.

It is still another object of the present invention to provide a lighting apparatus and a method thereof with a distance measuring apparatus using a wireless signal.

It is still another object of the present invention to provide a lighting apparatus and a method thereof with a distance measuring apparatus using a wireless signal.

Other objects of the present invention will become readily apparent from the following description of the embodiments.

According to an aspect of the present invention, there is provided an illuminating device for controlling illuminance by measuring a distance to a user using a radio signal, the illuminating device comprising: a light source for emitting a radio signal An antenna unit for transmitting the first signal to the user and receiving a second signal that is a reflected wave of the first signal and a transmission unit for transmitting the frequency of the first signal to the user, A frequency difference calculator for calculating frequency difference information by calculating a difference between the frequency difference information and the frequency slope information of the triangular signal; And a lighting controller for controlling the illuminance of the LED according to the distance information.

The transmission signal generator includes: a triangular signal generator for generating a low frequency triangular signal whose frequency changes into a triangular shape at a predetermined slope with respect to time; a local oscillator generating a carrier signal having a higher frequency than the triangular signal; And a modulator for modulating the carrier signal with the triangular signal to generate the first signal.

Here, the transmission signal generator may include: a sweep signal generator for generating a control signal for sweeping a predetermined frequency range; And a local oscillation unit for generating a first signal whose frequency varies in a triangular shape at a predetermined slope with respect to time according to the control signal.

Here, the arithmetic unit calculates a frequency variation amount of the second signal due to the Doppler effect generated due to the motion of the user based on the frequency difference information or the difference between the maximum and minimum frequency values of the first signal and the second signal , The frequency difference information, the frequency slope information of the triangular signal, and the frequency variation amount information of the second signal due to the Doppler effect to generate the distance information to the user reflecting the first signal .

Here, if the calculated distance is greater than a predetermined distance, the illumination control unit operates the LED with a low illuminance, and when the calculated distance is smaller than a predetermined distance, .

A method of controlling illuminance by measuring a distance to a user using a wireless signal, the method comprising: (a) generating a first signal that is a radio signal whose frequency changes in a triangular shape at a predetermined slope with respect to time; And (b) transmitting the first signal to the user and receiving a second signal that is a reflected wave of the first signal, and (c) transmitting a second signal having a frequency corresponding to a frequency difference between the first signal and the second signal, (D) calculating distance information to the user reflecting the first signal based on the frequency difference information and the frequency slope information of the triangular signal; And (e) operating the illuminating device by controlling the illuminance in accordance with the distance information.

The step (a) includes the steps of: (a1) generating a triangular signal whose frequency changes into a triangular shape according to a predetermined frequency slope with respect to time, and (a2) generating a carrier signal having a predetermined constant frequency step; And (a3) modulating the carrier signal with the triangular signal to generate a first signal.

Here, the step (a) includes the steps of: (a1) generating a control signal for sweeping a predetermined frequency range; And (b) generating a first signal whose frequency changes in a triangular shape at a predetermined slope with respect to time in accordance with the control signal.

Here, it is preferable that the step (d) further comprises a step of calculating a difference between the frequency difference information or the difference between the maximum and minimum frequency values of the first signal and the second signal, And generates distance information to a user reflecting the first signal based on the frequency difference information, the frequency slope information of the triangular signal, and the frequency variation amount information of the second signal due to the Doppler effect . ≪ / RTI >

(E) controlling the illuminance of the LED in consideration of the calculated distance information and time zone.

 If the calculated distance is greater than a preset distance, the LED is operated with a low illuminance. If the calculated distance is less than a preset distance, the step (e) And a control unit.

A sweep signal generator for generating a sweep signal for sweeping a predetermined frequency range, and a local signal generator for generating a first signal whose frequency changes in a triangular shape at a predetermined slope with respect to time according to the sweep signal, An antenna for transmitting the first signal and receiving a second signal that is a reflected wave of the first signal and receiving a third signal that is a radio signal different from the second signal; 1 signal and provides it to the antenna and receives a second signal and a third signal from the antenna and receives a fourth signal that is a signal having a frequency difference value of the first signal and the second signal, A first frequency mixer for generating and outputting a fifth signal which is a signal having a frequency of a frequency difference between the first signal and the first signal; A second local oscillator for outputting a signal having a frequency difference value between the first signal and the second local oscillator and a second local oscillator for outputting a signal having a frequency difference value between the first signal and the second local oscillator, A demodulator for demodulating a signal input from the second frequency mixer and outputting a pulse, a carrier signal detector for detecting a carrier wave from the signal input from the demodulator and filtering the waveform, A waveform shaping unit for shaping the waveform of the amplified fourth signal outputted from the amplifying unit and a signal selecting unit for selectively receiving any one of the output signal of the carrier signal detecting unit or the output signal of the waveform shaping unit according to a predetermined selection signal And a controller for generating the selection signal according to a function to be performed during the radio signal sensing or distance measurement, And when the signal received from the switch unit is an output signal of the carrier signal detecting unit, it determines the true and frequency bands of the demodulated signal, measures the signal intensity, and outputs a predetermined signal And generates distance information to the user reflecting the first signal based on the frequency difference information and the frequency tilt information of the triangular signal when the signal provided from the switch unit is the output of the waveform shaping unit An operation unit; And a lighting controller for controlling the LED according to the distance information to the user.

 Here, when the signal provided from the switch unit is the output of the waveform shaping unit, the arithmetic unit calculates the difference between the maximum or minimum frequency value of the fourth signal or the first signal and the second signal, Based on the frequency difference information, the frequency slope information of the triangular signal, and the frequency variation amount information of the second signal due to the Doppler effect, the first signal And the distance information to the user who reflects the distance information.

According to the present invention, there is an effect that the illuminance can be controlled in accordance with necessity by controlling the illuminance according to the distance by measuring the distance to the illuminating device.

In addition, there is an effect that energy can be saved by controlling the illuminance of the illumination according to the distance from the user.

In addition, there is an advantage that the distance from the user can be easily realized by using the existing radio signal sensing device.

Further, there is an effect that the user can control the illuminance according to the degree of access to the illuminating device by using the Doppler effect.

1 is a view showing a configuration of a lighting apparatus according to an embodiment of the present invention.
2 to 4 are reference views for explaining the principle of measuring a distance to a user approaching a lighting apparatus using a radio signal according to an embodiment of the present invention.
5 is a flowchart illustrating a method of measuring a distance to a user using a radio signal according to an embodiment of the present invention.
6 is a functional block diagram of a distance measuring apparatus using a wireless signal according to another embodiment of the present invention.
Figure 7 is a functional block diagram of a wireless signal sensing and distance measuring device in accordance with a preferred embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. 1 < / RTI > and 2 or these terms are used only for the purpose of distinguishing one element from another. Also, the singular expressions may include plural expressions unless the context clearly dictates otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a configuration of a lighting apparatus according to an embodiment of the present invention.

The lighting apparatus 10 of the present invention includes a transmission signal generating unit 101, a frequency difference calculating unit 102, an antenna 103, a waveform shaping unit 104, an operation unit 105, a lighting control unit 106, 107).

The transmission signal generating unit 101 generates a first signal which is a transmission signal f1 transmitted to a space toward the person 20 to measure the distance through the antenna 103. [ The first signal which is the above-mentioned emission signal f1 is preferably a high-frequency signal whose frequency changes in a triangular shape within a predetermined frequency range set in advance.

The triangular signal generator 1011 generates a low frequency signal whose frequency changes in a triangular shape within a predetermined frequency range. The local oscillator 1012 generates a high frequency signal having a predetermined frequency. The modulation unit 1013 modulates the output signal of the uplink local oscillation unit 1012 with the output signal of the uplink triangle signal generation unit 1011 to generate the first signal.

The frequency difference calculator 102 receives the first signal from the up-modulating unit 1013 and transmits the first signal to the antenna 103. The antenna 103 receives a second signal, which is a reflected signal of the first signal, and generates and outputs a third signal having a frequency corresponding to a frequency difference between the first signal and the second signal.

The antenna 103 receives the first signal from the upper frequency difference calculator 102, sends it to the space, receives the reflected signal (second signal) from which the first signal is reflected from the user 20 approaching to the illuminator And provides it to the upper frequency difference calculator 102 again.

The waveform shaping unit 104 receives the third signal from the upper frequency difference calculator 102 and shapes the waveform. The operation unit 105 receives the output of the upper waveform shaping unit 104 and measures the distance to the user 20 that reflects the second signal. Then, the illumination control unit 106 causes the LED 107 to operate at a predetermined illumination level using the distance measurement result information calculated by the calculation unit 105. The operation illuminance of the LED 107 can be variously set in consideration of the distance from the lighting device 10 to the user 20. [ In addition, the illumination control unit 106 may control the illuminance in consideration of the distance to the user 20 and the time zone. For example, when the surrounding area is bright and the daytime is bright, the illuminance can be weakly operated and the illuminance can be strongly operated in a dark evening. To this end, the lighting device 10 may further include a clock.

A method of measuring the distance between the illuminating device 10 and the user 20 using a wireless signal will be described with reference to FIGS. 2 to 4 on the principle of distance measurement using a wireless signal according to the present invention. Since the propagation speed is equal to the light traveling speed of 3x10 8 (m / sec), the distance to the user can be measured by measuring the time of the reflected wave reflected from the object. In the present invention, a microwave signal frequency-modulated with triangular waves of several Hertz is transmitted to an antenna, and the frequency difference between the microwave signal and the reflected wave reflected from the user 20 approaching the lighting apparatus 10 is measured. ) Is calculated.

Then, the illumination control unit 106 controls the illuminance of the LED 107 in consideration of the distance to the user 20 and operates it.

2 to 4 are reference views for explaining the principle of measuring a distance to a user approaching a lighting apparatus using a radio signal according to an embodiment of the present invention.

The reference solid line 201 corresponds to the first signal in the present invention and the dotted line 202 corresponds to the second signal in the reference road for explaining the principle of measuring the distance using the wireless signal according to the present invention. Δt denotes a delay time of the first signal and the second signal, and Δf denotes a frequency difference value between the first signal and the second signal according to the influence of the delay time. As shown in Fig. 2, ts can be obtained from fs = f1 - f2 obtained from the already known slope of the triangular wave and the output of the frequency mixer. ts is the time taken for the radio waves to return from the antenna 20 to the user 20, and thus 1/2 of this time is the time it takes for the radio waves to reach the user 20 from the antenna, and the propagation speed is 3x10 8 m The distance from this to the user 20 can be calculated.

FIG. 3 is a reference view for explaining the principle of measuring a distance to a user moving away from the antenna according to the present invention, and FIG. 4 is a view for explaining a principle of measuring a distance to a user approaching the antenna according to the present invention. . Here, the solid lines 301 and 401 correspond to the first signal in the present invention, and the dotted lines 302 and 402 correspond to the second signal.

The distance measurement for the user 20 in motion should take into account the frequency shift due to the Doppler effect at the time the wave travels back and forth. The distance calculation for the user 20 away from the antenna is as follows.

The frequency reflected by the user 20 away from the antenna and returned is lower than the frequency f of the reflected wave signal in the stationary state by a frequency shift fd due to the Doppler effect, After eliminating the frequency shift caused by the Doppler effect, the distance must be calculated.

That is, since f1s = fs + fd and f2s = fs-fd, fs = 1/2 (f1s + f2s). Therefore, by measuring the frequency difference at the rising portion of the triangular wave and the frequency difference (f2s) at the falling portion of (f1s), fs can be obtained and ts can be calculated therefrom. Or by measuring the difference between the maximum frequency value of the transmitted radio wave and the received reflected wave or measuring the difference between the transmitted radio wave and the minimum frequency value of the received reflected wave, the transition information of the reflected wave due to the puller effect can be known.

The distance calculation for the user 20 approaching the antenna can be performed as follows. Since the frequency reflected by the user 20 approaching the antenna 20 and reflected by the frequency shift fd due to the Doppler effect enters the reflection frequency f in the stationary state, After eliminating the frequency shift, calculate the distance.

That is, since f1s = fs-fd and f2s = fs + fd, fs = 1/2 (f1s + f2s). Also in this case, fs can be obtained by measuring the frequency difference at the rising portion and the frequency difference at the falling portion of the triangular wave, and ts can be calculated therefrom.

By measuring the distance between the illumination device 10 and the user 20 by using the Doppler effect, it is possible to know whether the user 20 approaches the illumination device 10 or not. Thus, when the user approaches the illumination device 10 May control the illuminance of the illumination using the time the user 20 approaches the illumination device 10. [

For example, when it is determined that the user approaches the illuminating device, if the user approaches the illuminating device 10 after 5 seconds, the illuminance of the LED is gradually increased, can do. When the user 20 moves away from the lighting apparatus 10, the illuminance of the LED can be controlled.

5 is a flowchart illustrating a method of measuring a distance to a user using a radio signal according to an embodiment of the present invention.

First, the frequency is changed to a predetermined ratio (or slope) within a predetermined range to generate a first signal drawn in the solid line of FIG. 2 (S100). The first method for generating the first signal is to generate a low frequency triangular signal whose frequency changes into a triangular shape, generate a carrier signal having a constant high frequency, modulate the upper carrier signal using the upper triangular signal, The second method generates a control signal that sweeps a certain frequency range and generates a first signal at a local oscillator in accordance with the control signal. I will.

Thereafter, the first signal is transmitted through the antenna (S101), and the second signal, which is the reflected signal of the first signal, is received through the antenna (S102). Then, frequency difference information between the first signal and the second signal is generated, and the distance to the user reflecting the first signal is calculated using this information (S103). Thereafter, a set illuminance according to the distance to the upper user is determined (S104), and the illuminance is controlled according to the distance to operate the LED (S105).

Here, the illuminance of the LED can be controlled in consideration of the surrounding illumination environment. For example, it is possible to control the illuminance of the LED to be further lowered in the daytime when the ambient illuminance is high and to control the illuminance of the LED to be higher in the evening period when the ambient illuminance is low.

6 is a functional block diagram of a distance measuring apparatus using a wireless signal according to another embodiment of the present invention.

The sweep signal generator 601 sweeps the first local oscillator 602 to generate a first signal, which is a signal having a triangular shape of the frequency graph in accordance with the time when the frequency changes at a predetermined slope within a predetermined range. And generates a control signal.

The first local oscillation unit 602 generates the first signal according to the sweep control signal provided from the upper sweep signal generation unit 601.

The first frequency mixer 603 receives the first signal from the first local oscillator 602 and provides it to the antenna. The first signal from the antenna provides a second signal that is a reflected wave reflected from the user 20 And generates a third signal having a frequency corresponding to a difference between the frequencies of the first signal and the second signal.

The amplifying unit 604 receives and amplifies the output of the first frequency mixing unit 603. The waveform shaping unit 605 receives the output of the upper amplifier 604 and performs a function of shaping the waveform.

The arithmetic operation unit 105 receives the output of the upper waveform shaping unit and measures the distance to the user 20 based on the third signal. The arithmetic operation unit 105 calculates the distance to the user 20 based on the frequency difference information and the frequency tilt information of the triangle signal. And generates distance information to the user 20.

When the calculated distance is greater than a predetermined distance, the lighting control unit 106 operates the LED 107 with a low illuminance, and when the calculated distance is smaller than a predetermined distance, Thereby controlling the LED 107 to operate. Also, the illuminance of the LED 107 can be controlled in consideration of the time zone.

Figure 7 is a functional block diagram of a wireless signal sensing and distance measuring device in accordance with a preferred embodiment of the present invention.

The first frequency mixer 603 receives the first signal from the first local oscillator 602 and provides it to the antenna. The first signal from the antenna receives the second signal, which is a reflected wave reflected back from the user 20 Generates a third signal having a frequency corresponding to the difference between the frequencies of the first and second signals, and combines the fourth signal, which is another signal received through the antenna, with the signal of the first local oscillator 602 And outputs a signal of the first intermediate frequency.

The first local oscillation unit 602 generates the first signal according to the sweep control signal supplied from the upper sweep signal generation unit 601. The first local oscillation unit 602 generates a first signal having a predetermined range (for example, 11.4 GHz to 11.7 GHz) Is a signal whose frequency is variable. The sweep signal generator 601 sweeps the first local oscillator 602 to generate a first signal, which is a signal having a triangular shape of the frequency graph in accordance with the time when the frequency changes at a predetermined slope within a predetermined range. And generates a control signal.

The amplifying unit 604 amplifies the signal of the first intermediate frequency inputted from the first frequency mixing unit 603. The second frequency mixer 802 combines the signal of the first intermediate frequency inputted from the amplifier 604 with the signal of the second local oscillator 801 and outputs the signal of the second intermediate frequency.

The demodulator 803 demodulates the original signal from the signal input from the second frequency mixer 802. [

The carrier signal detector 804 detects a carrier wave from a signal input from the demodulator 803 and controls the operation of the sweep signal generator 601 according to the frequency of the detected carrier wave.

The waveform shaping unit 605 receives the output of the upper amplifier 604 and performs a function of shaping the waveform.

The switch unit 805 serves to select one of the output of the upper carrier signal detector 804 and the output of the waveform shaping unit 605 and provide the selected one to the arithmetic unit 105 in accordance with the selection signal provided from the arithmetic unit 105 .

When the signal provided from the upper switch unit 805 is an output signal of the carrier signal detector 804, the arithmetic unit 105 sweeps the output signal of the first local oscillator 602 to detect the microwave of the wide band. Drives the signal generator 601, and generates information on the radio signal detection result. If the signal provided from the upper switch unit 805 is an output signal of the waveform shaping unit 605, the controller 601 measures a distance to the user 20 based on the third signal. And generates a selection signal regarding a signal to be selected by the upper switch unit 805 and provides the selection signal to the upper switch unit 805.

The illumination control unit 106 controls the illuminance of the LED according to the distance information to the measured user. Further, the illuminance of the LED 107 may be controlled in consideration of the ambient illumination environment of the illumination apparatus. In other words, the illuminance of the LED 107 is controlled in consideration of the distance to the user 20 and the illuminance around the illuminator in consideration of the bright time zone and the dark time zone. For this, the lighting control unit 106 may further include a clock device.

The above-described embodiments of the present invention can be embodied in a general-purpose digital computer that can be embodied as a program that can be executed by a computer and operates the program using a computer-readable recording medium. The computer-readable recording medium may be a magnetic storage medium (e.g., ROM, floppy disk, hard disk, etc.), an optical reading medium (e.g. CD ROM, Lt; / RTI > transmission).

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims And changes may be made without departing from the spirit and scope of the invention.

10: lighting device 20: user
101: transmission signal generator 102: frequency difference calculator
103: antenna 104: wave shaping part
105: operation unit 106:
107: LED 601: sweep signal generator
602: first local oscillation unit 603: first frequency mixing unit
604: Amplification unit 605: Waveform shaping unit
801: second local oscillator 802: second frequency mixer
803: demodulator 804: carrier signal detector
805:

Claims (13)

delete A lighting apparatus for controlling illumination using a wireless signal to measure a distance to a user,
LED;
A transmission signal generating unit for generating a first signal that is a radio signal whose frequency changes into a triangular shape at a predetermined slope with respect to time;
An antenna unit that transmits the first signal to the user and receives a second signal that is a reflected wave of the first signal;
A frequency difference calculator for calculating a frequency difference between the first signal and the second signal to generate frequency difference information;
An operation unit for generating distance information to the user based on the frequency difference information and the frequency slope information of the first signal; And
And a lighting control unit for controlling the illuminance of the LED according to the distance information,
Wherein the transmission signal generator comprises:
A triangular signal generating unit for generating a low frequency triangular signal whose frequency changes into a triangular shape at a predetermined slope with respect to time;
A local oscillator generating a carrier signal having a higher frequency than the triangular signal; And
A modulator for modulating the carrier signal with the triangular signal to generate the first signal;
And an illumination control unit for controlling the intensity of the illumination signal.
A lighting apparatus for controlling illumination using a wireless signal to measure a distance to a user,
LED;
A transmission signal generating unit for generating a first signal that is a radio signal whose frequency changes into a triangular shape at a predetermined slope with respect to time;
An antenna unit that transmits the first signal to the user and receives a second signal that is a reflected wave of the first signal;
A frequency difference calculator for calculating a frequency difference between the first signal and the second signal to generate frequency difference information;
An operation unit for generating distance information to the user based on the frequency difference information and the frequency slope information of the first signal; And
And a lighting control unit for controlling the illuminance of the LED according to the distance information,
Wherein the transmission signal generator comprises:
A sweep signal generator for generating a control signal for sweeping a predetermined frequency range; And
A local oscillation unit for generating a first signal whose frequency varies in a triangular shape at a predetermined slope with respect to time according to the control signal;
And an illumination control unit for controlling the intensity of the illumination signal.
The method according to claim 2 or 3,
Wherein the operation unit calculates a frequency variation amount of the second signal due to the Doppler effect caused by the movement of the user based on the frequency difference information or the difference between the maximum or minimum frequency values of the first signal and the second signal, The frequency difference information, the frequency tilt information of the first signal, and the frequency variation amount information of the second signal due to the Doppler effect, the distance information to the user reflecting the first signal is generated Illumination control lighting system using signal.
The method according to claim 2 or 3,
When the calculated distance is greater than a predetermined distance, the light control unit operates the LED with a low illuminance and when the calculated distance is less than a predetermined distance, the LED is operated with a strong illuminance Characterized in that the illumination control device uses a radio signal.
delete A method of controlling illuminance by measuring a distance to a user using a wireless signal,
(a) generating a first signal that is a radio signal whose frequency changes in the form of a triangle with a predetermined slope with respect to time;
(b) sending the first signal to the user and receiving a second signal that is a reflected wave of the first signal;
(c) generating frequency difference information corresponding to a frequency difference between the first signal and the second signal;
(d) calculating distance information to the user reflecting the first signal based on the frequency difference information and the frequency slope information of the first signal; And
(e) controlling the illuminance according to the distance information to operate the LED,
The step (a)
(a1) generating a triangular signal whose frequency changes in a triangular shape according to a predetermined frequency slope with respect to time;
(a2) generating a carrier signal having a predetermined constant frequency; And
(a3) modulating the carrier signal with the triangular signal to generate the first signal;
And a controller for controlling the intensity of the light.
A method of controlling illuminance by measuring a distance to a user using a wireless signal,
(a) generating a first signal that is a radio signal whose frequency changes in the form of a triangle with a predetermined slope with respect to time;
(b) sending the first signal to the user and receiving a second signal that is a reflected wave of the first signal;
(c) generating frequency difference information corresponding to a frequency difference between the first signal and the second signal;
(d) calculating distance information to the user reflecting the first signal based on the frequency difference information and the frequency slope information of the first signal; And
(e) controlling the illuminance according to the distance information to operate the LED,
The step (a)
(a5) generating a control signal to sweep a predetermined frequency range; And
(a6) generating the first signal whose frequency changes in a triangular shape at a predetermined slope with respect to time according to the control signal;
And a controller for controlling the intensity of the light.
9. The method according to claim 7 or 8,
Wherein the step (d) comprises: calculating a frequency variation amount of the second signal due to the Doppler effect generated due to the movement of the user based on the frequency difference information or the difference between the maximum and minimum frequency values of the first signal and the second signal; And generating distance information to the user reflecting the first signal based on the frequency difference information, the frequency tilt information of the first signal, and the frequency variation amount information of the second signal due to the Doppler effect A method of controlling illumination using a wireless signal.
9. The method according to claim 7 or 8,
(f) controlling the illuminance of the LED in consideration of the calculated distance information and the time zone.
11. The method of claim 10,
The step (f) includes operating the LED with a low illuminance when the calculated distance is greater than a preset distance, and when the calculated distance is less than a predetermined distance, operating the LED with a high illuminance And controlling the intensity of the light.
LED;
A sweep signal generator for generating a sweep signal for sweeping a predetermined frequency range;
A first local oscillator generating a first signal whose frequency changes in a triangular shape with a predetermined slope with respect to time according to the sweep signal;
An antenna for transmitting the first signal, receiving a second signal that is a reflected wave of the first signal, and receiving a third signal that is a radio signal different from the second signal;
A first local oscillation unit receiving a first signal and providing the first signal to the antenna, receiving a second signal and a third signal from the antenna, and receiving a signal having a frequency difference value between the first signal and the second signal, A first frequency mixer for generating and outputting a fourth signal, which is a signal having a frequency of a frequency difference value between the third signal and the first signal;
An amplifying unit for amplifying a signal input from the first frequency mixing unit;
A plurality of second local oscillation units outputting signals of different frequencies;
A second frequency mixer for combining the fifth signal and the signal input from the second local oscillation unit and outputting a signal having a frequency difference value of the two signals;
A demodulator for demodulating a signal input from the second frequency mixer and outputting a pulse;
A carrier signal detector for detecting a carrier wave from the signal input from the demodulator and filtering the waveform;
A waveform shaping unit for shaping the waveform of the amplified fourth signal output from the amplifying unit;
A switch unit for selectively receiving any one of an output signal of the carrier signal detecting unit and an output signal of the waveform shaping unit according to a predetermined selection signal;
The selection signal is generated and provided to the switch unit according to a function to be performed during radio signal detection or distance measurement, and is provided with an output signal of the switch unit. When the signal received from the switch unit is an output signal of the carrier signal detection unit And outputs the predetermined signal when the signal provided from the switch unit is the output of the waveform shaping unit, and outputs the frequency difference information and the first signal An operation unit for generating distance information to the user reflecting the first signal based on the frequency tilt information of the first signal; And
And a lighting controller for controlling the LED according to the distance information to the user.
13. The method of claim 12,
And the arithmetic unit generates the fourth signal or the difference between the maximum or minimum frequency value of the first signal and the second signal when the signal provided from the switch unit is the output of the waveform shaping unit Calculates a frequency variation amount of the second signal by the Doppler effect, and calculates the frequency difference information of the first signal based on the frequency difference information, the frequency slope information of the first signal, and the frequency variation amount information of the second signal by the Doppler effect And generates distance information to the user who has reflected the light.

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