KR101123337B1 - Optical-based signal generator and sensing signal generating system having the same - Google Patents

Abstract

PURPOSE: A sensing signal generator of optically-based and a sensing signal generation system including the same are provided to generate an optical signal having purpose frequency component optical signals. CONSTITUTION: A sensing signal generator of optically-based comprises an optical signal generating part(110), a light transmission channel(118), an optical detecting part(120), a variable amplifying part(150) and a context sensitive antenna. The light transmission channel transmits the optical signal. The optical detecting part is input the optical signal through the light transmission channel. The optical detecting part changes the inputted optical signal into the electric signal having the direct-current component and ripple current.

Description

Optical-based sensing signal generating device and sensing signal generating system including the same {Optical-Based Signal Generator and Sensing Signal Generating System having the same}

The present invention relates to a sensing sensor, and more particularly, to a sensing sensor using an optical signal.

Today, sensors using lasers and other optical signals are used in many ways. Such a sensor is implemented in various forms such as an object recognition sensor and an intrusion detection sensor.

In order to realize the precise operation of such a sensor, it is mainly a laser, but a sensor that uses a light signal excellent in business feasibility by using a millimeter wave signal in the 60 GHz band that can achieve a similar effect without a laser and can be used without a license. Such an implementation would be strongly requested if it could work. In addition, there is an urgent need for a method of more stably operating the sensing sensors that transmit and receive the 'sense signal', which is a signal of the wireless transmission / reception state when the electrical signal according to the optical signal is wirelessly transmitted and received.

It is an object of at least one embodiment of the present invention to provide a generating device for generating a sensing signal for stable and efficient operation of an optical-based sensing sensor.

Another object of at least another embodiment of the present invention is to provide an optical-based sensing signal generation system for generating a sensing signal for stable and efficient operation of an optical-based sensing sensor.

In order to achieve the above object, the sensing signal generating apparatus according to at least one embodiment of the present invention comprises an optical signal generating unit for generating an optical signal having a target frequency component by combining optical signals having different frequency components; An optical transmission path for transmitting the generated optical signal; An optical detector which receives an optical signal through the optical transmission path and converts the input optical signal into an electrical signal having a DC component and an AC component; And a variable amplifier configured to adaptively adjust the magnitude of the alternating current component to the direct current component to output the alternating current component while maintaining a constant size.

The optical signal generator may include a first light source generating a first optical signal having a first frequency component; A second light source for generating a second optical signal having a second frequency component; And an optical coupling unit configured to combine the first optical signal and the second optical signal to generate an optical signal having a desired frequency component.

The variable amplifying unit may include an electrical signal splitting unit configured to divide the converted electrical signal into a DC signal having the DC component and an AC signal having the AC component; An amplification ratio adjusting unit configured to generate a control signal for controlling an amplification ratio of the AC signal in consideration of the magnitude of the DC signal; And an AC signal variable amplifier configured to variably adjust the magnitude of the divided AC signal according to the control signal. At this time, the amplification ratio adjusting unit for dividing the DC signal by a predetermined ratio; A main signal source controller configured to determine a first property which is an attribute of the control signal for adjusting the magnitude of the AC signal at a ratio of a predetermined size or more in consideration of a part divided by the DC signal divider; A low noise amplifier configured to amplify all of the other part divided by the DC signal divider and the noise included in the other part by a predetermined ratio or more; A magnitude noise adjusting unit determining a second property which is an attribute of the control signal for adjusting the magnitude of the AC signal at a ratio less than a predetermined magnitude in consideration of a change in the magnitude of the amplified noise; And a control signal combiner configured to generate the control signal in consideration of the first property and the second property. In this case, the sensing signal generating apparatus generates the AC signal corresponding to the DC signal for a time period from the time when the DC signal is input to the amplification ratio adjusting unit to the time when the control signal is generated by the control signal combining unit. The signal delay unit may further include a delay.

The variable amplification unit may include: a predetermined ratio dividing unit dividing the converted electric signal into a first electric signal and a second electric signal according to a predetermined ratio; A direct current signal acquisition unit for acquiring a direct current signal having the direct current component from the first electrical signal by using a square detection method; An amplification ratio adjusting unit configured to generate a control signal for controlling an amplification ratio of the AC signal in consideration of the magnitude of the obtained DC signal; And an AC signal variable amplifier configured to variably adjust the size of the AC component included in the second electrical signal according to the control signal.

In order to achieve the above object, the optical-based sensing signal generation system according to at least one embodiment of the present invention, the optical signal generating unit for generating an optical signal of the target frequency component by combining the optical signals having different frequency components; An optical transmission path for transmitting the generated optical signal; An optical detector which receives an optical signal through the optical transmission path and converts the input optical signal into an electrical signal having a DC component and an AC component; A variable amplifier for outputting the AC component while maintaining a constant size by adaptively adjusting the size of the AC component; And a situation sensing antenna for converting and radiating an electric signal input from the variable amplifier into radio waves for situation sensing and receiving radio waves from the outside.

Here, the optical signal having the target frequency component may be an optical signal of the millimeter wave band of the 57 GHz to 64 GHz band.

The optical signal generator may include a first light source generating a first optical signal having a first frequency component; A second light source for generating a second optical signal having a second frequency component; And an optical coupling unit configured to combine the first optical signal and the second optical signal to generate an optical signal having a desired frequency component. In this case, the optical coupler may be a 2: 1 optical signal combiner.

The variable amplifying unit may include an electrical signal splitting unit configured to divide the converted electrical signal into a DC signal having the DC component and an AC signal having the AC component; An amplification ratio adjusting unit configured to generate a control signal for controlling an amplification ratio of the AC signal in consideration of the magnitude of the DC signal; And an AC signal variable amplifier configured to variably adjust the magnitude of the divided AC signal according to the control signal. At this time, the amplification ratio adjusting unit for dividing the DC signal by a predetermined ratio; A main signal source controller configured to determine a first property which is an attribute of the control signal for adjusting the magnitude of the AC signal at a ratio of a predetermined size or more in consideration of a part divided by the DC signal divider; A low noise amplifier configured to amplify all of the other part divided by the DC signal divider and the noise included in the other part by a predetermined ratio or more; A magnitude noise adjusting unit determining a second property which is an attribute of the control signal for adjusting the magnitude of the AC signal at a ratio less than a predetermined magnitude in consideration of a change in the magnitude of the amplified noise; And a control signal combiner configured to generate the control signal in consideration of the first property and the second property. At this time, the optical-based sensing signal generation system transmits the AC signal corresponding to the DC signal from the time when the DC signal is input to the amplification ratio adjusting unit to the time when the control signal is generated by the control signal combining unit. The signal delay unit may further include a delay for a time of.

The variable amplification unit may include: a predetermined ratio dividing unit dividing the converted electric signal into a first electric signal and a second electric signal according to a predetermined ratio; A direct current signal acquisition unit for acquiring a direct current signal having the direct current component from the first electrical signal by using a square detection method; An amplification ratio adjusting unit configured to generate a control signal for controlling an amplification ratio of the AC signal in consideration of the magnitude of the obtained DC signal; And an AC signal variable amplifier configured to variably adjust the size of the AC component included in the second electrical signal according to the control signal.

According to at least one embodiment of the present invention, there is provided a sensing signal generating apparatus and a sensing signal generating system including the optical signal generating unit for generating an optical signal having a desired frequency component by combining optical signals having different frequency components; An optical transmission path for transmitting the generated optical signal; An optical detector which receives an optical signal through the optical transmission path and converts the input optical signal into an electrical signal having a DC component and an AC component; And a variable amplifier configured to output the AC component while maintaining a constant size by adaptively adjusting the size of the AC component to generate the detection signal for stable and efficient operation of an optical sensor. Can be.

1 is a block diagram of a sensing signal generating apparatus and a sensing signal generating system including the same according to an embodiment of the present invention.
2A and 2B are detailed block diagrams for explaining an example of the operation of the amplification ratio adjusting unit.
3 is a detailed block diagram illustrating another example of the operation of the amplification ratio adjusting unit illustrated in FIG. 1.
4A and 4B are block diagrams for explaining an example of the operation of the antenna illustrated in FIG. 1.
5 is a block diagram of a sensing signal generating apparatus and a sensing signal generating system including the same according to another embodiment of the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings that illustrate preferred embodiments of the present invention and the accompanying drawings.

Hereinafter, an optical-based sensing signal generating apparatus and a sensing signal generating system including the same according to at least one embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of a sensing signal generating apparatus and a sensing signal generating system including the same according to an embodiment of the present invention, and FIGS. 2A and 2B are detailed block diagrams illustrating an example of an operation of an amplification ratio adjusting unit.

For millimeter wave signals in the microwave band, especially in the 60 GHz band, these signals can be used without a license. Signals in the 60 GHz band are very straight forward and feature large signal losses in the air. When utilizing these characteristics, it is possible to implement a target recognition sensor, an intrusion detection sensor, etc. using a laser or an optical signal. The straightness of the signal favors the acquisition of the sensing performance of the position, the object, and the high signal loss allows the implementation of a sensor that operates only within the desired area without disturbing the surroundings. Hereinafter, a signal of the 60 GHz band is generated in an optical manner, and the generated signal is transmitted through an optical fiber embedded in a building to a place where a sensor operation is needed, and a correction or correction of a signal change or loss that may occur during signal transmission is performed. Discuss specific measures.

The detection signal generation system shown in FIG. 1 includes a first light source 112, a second light source 114, an optical signal generator 100 including a 2: 1 signal combiner 116, an optical transmission path 118, The light detector 120, the electric signal splitter 130, the amplification ratio controller 140, the AC signal variable amplifier 150, the antenna 160, the antenna 170, and the meter reader 180 are included.

The optical signal generator 110 combines optical signals having different frequency components to generate optical signals having target frequency components. To this end, the optical signal generator 110 may include a first light source 112 for generating a first optical signal having a first frequency component, a second light source 114 for generating a second optical signal having a second frequency component, and It may include a 2: 1 signal combiner 116 for combining the first optical signal and the second optical signal to generate an optical signal of the desired frequency component. The 2: 1 signal combiner 116 adds the first optical signal generated by the first light source 112 and the second optical signal generated by the second light source 114, and thus, herein, the 'target frequency component That is, the 'frequency component of the optical signal output from the 2: 1 signal combiner 116' does not mean only one frequency value, but the frequency value of the first optical signal and the frequency value of the second optical signal. Of course it means. It is preferable that the target frequency component is a frequency component so that the frequency of the detection signal is 60 GHz. However, in this specification, the portion in which 60 GHz is referred to is not necessarily limited to a value of 60 GHz, and the portion is merely described. For the sake of convenience, the reference is limited to 60 GHz. As such, the expression “60 GHz band” in the present specification is not limited to the expression for convenience of description and may mean, for example, a signal in the 57 to 64 GHz band. Incidentally, the 57 to 64 GHz band is a frequency band licensed in Korea for use without a license.

In the present embodiment, the optical signal generator 110 may generate a desired optical signal using an optical heterodyne method. When a 60 GHz band signal is transmitted by simple optical size modulation, it is difficult to predict the size of the signal according to distance due to color dispersion. In addition, in the optical fiber mainly installed in a general building such as a plastic optical fiber or a multimode optical fiber, the influence of chromatic dispersion becomes greater, so that it is not easy to predict the magnitude of the signal and generate a stable signal.

The present invention generates a signal of the desired frequency band in an optical heterodyne manner as a way to solve this problem. However, in the case of the present invention, the signal of the target frequency band is used for the purpose of the sensor rather than the data transmission. Therefore, a device for reducing phase noise for data transmission, that is, a device for having coherence between light sources generally used in the optical heterodyne signal generation method is not necessary in the present invention. The present invention provides an optical heterodyne signal using an optical coupler for combining the optical signal with a signal having a desired frequency band, i. There is one feature to creating a.

The optical transmission path 118 provides a path for the transmission of the generated optical signal. The optical transmission path 118 is preferably implemented using optical fibers.

The optical signal generated by the optical signal generator 110 of the present embodiment, in particular, the optical heterodyne signal, is transmitted to a desired place in the building through the optical fiber. The optical fiber may be any kind of plastic optical fiber, multimode optical fiber, single mode optical fiber, and the like. When the optical heterodyne signal is used for sensing, even if the phase noise fluctuation due to the optical fiber transmission is not taken into consideration, the performance of the optical heterodyne transmission method does not have to be considered. .

The optical detector 120 receives an optical signal through the optical transmission path 118 and converts the input optical signal into an electrical signal having a DC component and an AC component. The optical heterodyne signal transmitted through the optical fiber is converted into an electrical signal of 60 GHz band by the optical detector 120.

The conversion from the optical signal to the electrical signal uses a square law detection characteristic of the optical detector, and can be expressed by Equation 1 below.

[Equation 1]

In Equation 1, E ₁ , E ₂ means the energy emitted from the light source, that is, the laser. The frequencies of the two light sources are w ₁ , w ₂ , and the difference (w ₁ -w ₂ ) becomes the desired 60 GHz band. The phase of each light source is shown by (theta), (phi). P is an electrical signal that will be represented by the square detection characteristic when two light sources are detected by the photodetector. According to Equation 1, it can be seen that the AC component and the DC component of the signal in the 60 GHz band are simultaneously generated through electrical conversion of the optical signal. In addition, in this embodiment, since the phase noise removing method is not used, it can be seen that phase noise due to θ-φ remains.

The variable amplifier amplifies the size of the AC component in consideration of the DC component included in the electric signal. In detail, the variable amplification unit outputs the AC component while maintaining a constant size by adaptively adjusting the size of the AC component.

As shown in FIG. 1, the variable amplification unit includes an electric signal splitter 130, an amplification ratio adjusting unit 140, and an AC signal variable amplifying unit 150.

The electric signal dividing unit 130 divides the electric signal converted by the light detector 120 into a DC signal having a DC component and an AC signal having an AC component. In addition, the amplification ratio adjusting unit 140 generates a control signal for controlling the amplification ratio of the AC signal in consideration of the magnitude of the DC signal. The AC signal variable amplifier 150 variably adjusts the size of the AC signal divided by the electric signal splitter 130 according to the control signal. Hereinafter, the operation of the electric signal splitter 130 to the AC signal variable amplifier 150 will be described in more detail.

The electrical signal splitter 130 may be implemented using, for example, a 60 GHz bias tee (T) as a device for combining or distributing a 60 GHz signal that is an AC signal and a DC signal. Hereinafter, the 60 GHz bias tee T is an example of implementation of the electrical signal splitter 130.

In order to operate the sensor, it is important to constantly adjust the size of the signal of the 60 GHz band generated by the light detector 120. Optical signal transmission through optical fiber inevitably causes signal loss and is mainly affected by the optical fiber transmission distance and the type of optical fiber. By the way, since the optical fiber is complicatedly arranged in a building, especially a high-rise building, the transmission distance of an optical fiber cannot be known correctly. In addition, if the loss or fluctuation of the signal due to the physical environment change such as the bending of the optical fiber is large, it is more difficult to predict it, so simply generating a 60 GHz signal in the building in which the optical fiber is placed is difficult. You cannot expect smooth sensor operation.

Of course, it can also be configured to simply insert a device for measuring the signal size in the 60 GHz band and correct the magnitude of the electrical signal. However, in this case, since the operation of the 60 GHz band is required, there are problems of implementation difficulty and cost burden. The present invention adaptively adjusts the output of the AC signal variable amplifier 150 according to the magnitude of some components of the electrical signal of the 60 GHz band generated through the optical heterodyne, that is, the DC component (direct current). There are main features.

The amplification ratio adjusting unit 140 takes into account the magnitude of the DC signal branched by the electrical signal splitter 130 and amplifies the AC signal branched by the electrical signal splitter 130 (for example, an AC signal in a 60 GHz band). Generates a control signal for controlling. The AC signal variable amplifier 150 maintains a constant magnitude of the AC signal according to the input control signal and outputs the same.

The present invention is characterized by simply maintaining the size of the 60 GHz signal by simply controlling the operation of the AC signal variable amplifier 150 by placing the amplification ratio adjusting unit 140. As can be seen from Equation 1, the magnitude of the optical signal affects not only an AC signal (for example, a 60 GHz signal) but also a magnitude of a DC signal. There is this. For example, the AC signal variable amplifying unit 150 adjusts and outputs the amount of current input to the AC signal variable amplifying unit 150 according to the magnitude of the generated DC current (see FIG. 2A), or the AC signal variable. By further providing a signal attenuator 155 to adjust the output of the AC signal variable amplifier 150 in consideration of the DC current at the rear end of the amplifier 150, the size of the generated signal of 60 GHz band It can be kept constant (see FIG. 2B).

The antenna 160 wirelessly transmits an AC signal output from the AC signal variable amplifier 150, that is, a generated 60 GHz sensor signal, that is, a detection signal. The antenna 170 of another sensing sensor other than the sensing sensor where the antenna 160 is located may detect the object by receiving and sensing a sensing signal from the antenna 160.

In the present specification, the sensing signal generating apparatus means the rest of the sensing signal generating system except for an antenna (eg, the antenna 160 and the antenna 170).

3 is a detailed block diagram illustrating another example of the operation of the amplification ratio adjusting unit illustrated in FIG. 1. As shown in FIG. 3, the light detector 120, the electric signal splitter 130, the AC signal variable amplifier 150, and the antenna 160 may include the light detector 120 and the electric signal splitter shown in FIG. 1. The installment 130, the AC signal variable amplifier 150, and the antenna 160 are the same.

As shown in FIG. 3, the amplification ratio adjusting unit 140 includes a DC signal splitter 141, a main signal source controller 142, a low noise amplifier 143, a magnitude noise controller 144, and a control signal combiner. 145 may include.

Specifically, the DC signal divider 141 divides the DC signal divided by the electric signal divider 130 at a predetermined ratio.

The main signal source controller 142 controls the size of the AC signal divided by the electric signal splitter 130 at a ratio equal to or greater than a predetermined size in consideration of a part divided by the DC signal splitter 141. Determine the first attribute that is an attribute of.

The low noise amplifier 143 amplifies all other portions divided by the DC signal divider 141 and all of the noise included in the other portions by a predetermined ratio or more.

The magnitude noise adjusting unit 144 is a property of a control signal for adjusting the magnitude of the AC signal divided by the electric signal splitter 130 at a ratio less than a predetermined magnitude in consideration of the change in the amplitude of the amplified noise. 2 Determine the attribute. After all, the second attribute is a value for fine-tuning the magnitude of the AC signal.

The control signal combiner 145 generates a control signal in consideration of the first property and the second property.

Meanwhile, when the amplification ratio adjusting unit 140 is implemented as shown in FIG. 3, the sensing signal generating apparatus according to at least one embodiment of the present invention includes a signal delay unit 135. Here, the signal delay unit 135 controls the AC signal corresponding to the DC signal by the control signal coupling unit 145 corresponding to the DC signal from the time when the DC signal is input to the amplification ratio adjusting unit 140. The signal is delayed for a time until the signal is generated and transmitted to the AC signal variable amplifier 150.

4A and 4B are block diagrams for explaining an example of the operation of the antenna illustrated in FIG. 1. 4A and 4B, the electric signal splitter 130, the amplification ratio controller 140, the AC signal variable amplifier 150, the antenna 160, the antenna 170, and the meter reader 180 1 is the same as the electrical signal splitter 130, the amplification ratio adjusting unit 140, the AC signal variable amplifier 150, the antenna 160, the antenna 170, and the meter reader 180 shown in FIG. 1.

As shown in FIGS. 4A and 4B, the antenna may be implemented with two different antennas (antenna 160, antenna 170 of FIG. 4A), or with the same antenna to sense the reflected signal. May be (antenna 194 in FIG. 4B). The circulator 192 of FIG. 4B refers to an RF device that transmits a signal from the AC signal variable amplifier 150 only to the antenna 194, and sends a signal to the antenna 194 only to the meter 196. do. Meanwhile, the function itself of the meter reader 196 is the same as that of the meter reader 180 shown in FIG. 1.

5 is a block diagram of a sensing signal generating apparatus and a sensing signal generating system including the same according to another embodiment of the present invention, wherein the optical signal generating unit 110, the optical detecting unit 120, the constant ratio dividing unit 122, and the direct current are shown. The signal acquisition unit 124, the amplification ratio adjusting unit 140, the AC signal variable amplifier 150, the antenna 160, the antenna 170, the meter 180. The functions of the optical signal generator 110, the optical detector 120, the antenna 160, the antenna 170, and the meter reader 180 illustrated in FIG. 5 are the optical signal generator 110 and the optical detector illustrated in FIG. 1. The function of the 120, the antenna 160, the antenna 170, and the meter reader 180 is the same.

The constant ratio divider 122 divides the electrical signal converted by the light detector 120 into a first electrical signal and a second electrical signal according to a predetermined ratio. For example, the constant ratio divider 122 divides the electrical signal at a ratio of 1:99.

The DC signal acquisition unit 124 obtains a DC signal having a DC component from the first electrical signal by using a square detection method. 'Self heterodyne receiver' is an example of implementation of the DC signal acquisition unit 124. In general, a self heterodyne receiver is not used well in a communication system because it can degrade communication performance, but in at least one embodiment of the present invention, it is sufficient to operate as a function of detecting a magnitude of a 60 GHz signal. The problem of communication performance deterioration is not a problem in at least one embodiment of the present invention, but rather has the advantage of being able to simply measure the magnitude of the 60 GHz signal. The self heterodyne receiver directly obtains the DC current component from the input 60 GHz signal by the square detection method. Therefore, the self heterodyne receiver can obtain a DC current output that is changed according to the magnitude of the input 60 GHz signal, which becomes an input of the amplification ratio adjusting unit 140 to enable the size correction operation of the 60 GHz signal. Will be done.

The amplification ratio adjusting unit 140 generates a control signal for controlling the amplification ratio of the AC signal in consideration of the magnitude of the DC signal acquired by the DC signal obtaining unit 124.

The AC signal variable amplifier 128 variably adjusts the size of the AC component included in the second electrical signal according to the control signal.

Finally, features and advantages of at least one embodiment of the present invention are described further.

Optical signal generation and transmission is difficult to implement, but according to at least one embodiment of the present invention, a 60 GHz band sensor can be easily operated without the help of an expensive 60 GHz signal oscillator. According to at least one embodiment of the present invention, only one optical signal may be shared by all detection sensors in a building.

In addition, according to at least one embodiment of the present invention, since the phase noise is not considered in the optical 60 GHz signal generation method, only two optical signals having a 60 GHz wavelength interval can be configured to generate a detection signal. As a result, according to at least one embodiment of the present invention, there is no need to consider an optical heterodyne signal generation method that considers coherence of two light sources.

In addition, according to at least one embodiment of the present invention, with a simple configuration, the output of the electrical signal output from the AC signal variable amplifier 150 may be maintained constant. As a result, according to at least one embodiment of the present invention, with a simple configuration, the output of the sensing signal may be kept constant.

So far, the present invention has been described with reference to the preferred embodiments. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

Claims (6)

In the optical-based detection signal generation system,
An optical signal generator 110 for combining optical signals having different frequency components to generate optical signals having desired frequency components;
An optical transmission path 118 for transmitting the generated optical signal;
An optical detection unit 120 receiving an optical signal through the optical transmission path and converting the input optical signal into an electrical signal having a DC component and an AC component;
By dividing the converted electric signal into a DC signal having the DC component and an AC signal having the AC component and adjusting the magnitude of the AC component adaptively to the DC component, the output of the AC signal is kept constant and output. A variable amplifier; And
A situation sensing antenna for converting and radiating an electric signal input from the variable amplifier into radio waves for sensing a situation and receiving radio waves from the outside;
The variable amplifier comprises: an electrical signal dividing unit (130) for dividing the converted electrical signal into a DC signal having the DC component and an AC signal having the AC component; An amplification ratio adjusting unit 140 generating a control signal for controlling the amplification ratio of the AC signal in consideration of the magnitude of the DC signal; And an AC signal variable amplifying unit (150) for variably adjusting the size of the divided AC signal according to the control signal. The method according to claim 1,
And the optical signal having the desired frequency component is an optical signal in a millimeter wave band of 57 GHz to 64 GHz band. delete The method of claim 1, wherein the amplification ratio adjusting unit 140
A direct current signal dividing unit (141) for dividing the direct current signal at a predetermined ratio;
A main signal source controller 142 which determines a first property which is an attribute of the control signal for adjusting the magnitude of the AC signal at a ratio of a predetermined size or more in consideration of a part divided by the DC signal divider;
A low noise amplifier 143 for amplifying all other portions divided by the DC signal divider and all of the noise included in the other portion by a predetermined ratio or more;
A magnitude noise adjusting unit (144) for determining a second property which is an attribute of the control signal for adjusting the magnitude of the AC signal at a ratio less than a predetermined size in consideration of the magnitude change of the amplified noise; And
And an adjustment signal combiner (145) for generating the control signal in consideration of the first property and the second property. The method of claim 4, wherein the optical-based sensing signal generation system
A signal delay unit 135 for delaying the AC signal corresponding to the DC signal for a period from a time when the DC signal is input to the amplification ratio adjusting unit to a time when the control signal is generated by the control signal combiner; Optical-based detection signal generation system further comprises. In the optical-based detection signal generation system,
An optical signal generator 110 for combining optical signals having different frequency components to generate optical signals having desired frequency components;
An optical transmission path 118 for transmitting the generated optical signal;
An optical detection unit 120 receiving an optical signal through the optical transmission path and converting the input optical signal into an electrical signal having a DC component and an AC component;
By dividing the converted electric signal into a DC signal having the DC component and an AC signal having the AC component and adjusting the magnitude of the AC component adaptively to the DC component, the output of the AC signal is kept constant and output. A variable amplifier; And
A situation sensing antenna for converting and radiating an electric signal input from the variable amplifier into radio waves for sensing a situation and receiving radio waves from the outside;
The variable amplification unit includes: a predetermined ratio dividing unit 122 for dividing the converted electrical signal into a first electrical signal and a second electrical signal according to a predetermined ratio; A direct current signal acquisition unit (124) for acquiring a direct current signal having the direct current component from the first electrical signal by using a square detection method; An amplification ratio adjusting unit 140 generating a control signal for controlling an amplification ratio of the AC signal in consideration of the magnitude of the obtained DC signal; And an AC signal variable amplifying unit (150) for variably adjusting the magnitude of an AC component included in the second electrical signal according to the control signal.

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