KR102442794B1 - Millimeter wave power and phase difference detector and image processing method using the same - Google Patents

Abstract

The present invention detects the magnitude and phase difference between received signals using millimeter waves received through a plurality of antennas in a millimeter wave imaging system, and determines the position of the received signal or the position of the transmitter based on the detected signal magnitude and phase difference, , to a millimeter wave power and phase difference detector that compensates for a uniform output of a detector by correcting distortion of a signal based on a position of a received signal or a transmitter to obtain high image quality, and an image processing method using the same. A millimeter wave power and phase difference detector according to an embodiment of the present invention includes a plurality of antennas for receiving a millimeter wave signal in which a signal of a transmitter is reflected, diffracted, or scattered by a target, and a signal received through the plurality of antennas; , A signal detection unit for detecting a combined signal generated by adding signals received through each antenna, and a phase difference extraction for extracting the magnitude and phase difference between signals appearing between a plurality of antennas using the detected received signal of each antenna and the combined signal includes wealth. In addition, using the position extractor for extracting the position of the transmitter or the received signal using the phase difference information between the plurality of antennas extracted by the phase difference extractor, and the position information of the transmitter or the position information of the received signal extracted through the position extractor and a signal compensator for compensating for the received signal of the antenna so that the output of the detector for each antenna is uniform.

Description

Millimeter wave power and phase difference detector and image processing method using the same

The present invention relates to a millimeter wave power and phase difference detector and an image processing method using the same, and more particularly, to a millimeter wave image system using millimeter waves received through a plurality of antennas to detect the magnitude and phase difference between received signals, It identifies the position of the received signal or the position of the transmitter based on the magnitude and phase difference of the detected signal, and compensates for the output of the detector to be uniform by correcting the distortion of the signal based on the position of the received signal or the transmitter to obtain high image quality. A millimeter wave power and phase difference detector and an image processing method using the same.

In general, a millimeter wave imaging system is an electromagnetic wave imaging system using a millimeter wave (30 to 300 GHz) frequency signal with a shorter wavelength compared to conventional frequency resources. used in the field of

In addition, research and development has been carried out for the millimeter wave image detection receiver using expensive semiconductor processes such as CMOS, SiGe BiCMOS, or compound semiconductors of 65 nm or less, which have a device operating frequency higher than the reception frequency, but due to high manufacturing cost and performance limitations, etc. It is difficult to commercialize the low-cost array-type detection device for real-time large-area image detection required by the market.

In addition, energy detection technology called a plasmon detector or a resistor mixer is capable of detecting millimeter wave signals above the device operating frequency. A detector required for an area millimeter wave imaging system can be implemented.

However, the conventional CMOS-based energy detection technology has limitations in performance due to low detection characteristics compared to other millimeter wave detection technologies. In particular, the conventional CMOS-based energy detection technology has a problem in that it is difficult to increase the signal-to-noise ratio (SNR) of the imaging system due to the limitation of simply detecting the presence or absence of an introduced millimeter wave signal or the size of the signal.

Therefore, for a high-sensitivity energy detection technique for a real-time large-area millimeter wave imaging system, it is necessary to acquire additional detection information in addition to the conventional simple signal magnitude detection.

In addition, a characteristic of the millimeter wave image is that the outer shell of the object appears to be spread due to the scattering characteristics appearing at the boundary surface of the object. This characteristic prevents the object image from appearing clearly, making it difficult to determine the presence or absence of identification and the type of object.

A general method to solve this problem or to reduce the spread of the outer shell of an object is to increase the transmission/reception frequency to use a shorter wavelength, collect the scattered signals in the same way as a physical lens, or a transmission emission method considering signal scattering. have.

However, this method has limitations in manufacturing circuits/components due to high process use, and the same limitations in commercialization as in the prior art due to the limitations in that optical systems such as lenses are required through semiconductor post-processing.

Republic of Korea Patent Registration No. 10-1905097 (Announced on October 08, 2018)

Accordingly, the technical problem to be achieved by the present invention is to solve the disadvantages of the prior art, and the purpose of the present invention is to clearly implement a millimeter wave image that is scattered at the boundary surface of an object. Another object of the present invention is to improve the performance of a millimeter wave detector using only a semiconductor process. Another object of the present invention is to improve image quality by enlarging the signal-to-noise ratio or dynamic region of an image signal without using image restoration through signal processing.

A millimeter wave power and phase difference detector according to an aspect of the present invention for achieving this technical problem may include a plurality of antennas, a signal detector, a phase difference extractor, a position extractor, and a signal corrector. The plurality of antennas receive a millimeter wave signal in which a signal of a transmitter is reflected, diffracted, or scattered by a target.

In addition, the signal detector detects a combined signal generated by adding a signal received through a plurality of antennas and a signal received through each antenna. In addition, the phase difference extracting unit extracts a magnitude and a phase difference between signals appearing between a plurality of antennas by using the combined signal and the received signal of each antenna detected by the signal detection unit.

In addition, the position extractor extracts the position of the transmitter or the received signal by using the phase difference information between the plurality of antennas extracted by the phase difference extractor. In addition, the signal compensator compensates the received signal of the antenna so that the output of the detector for each antenna is uniform by using the position information of the transmitting end or the position information of the received signal extracted through the position extracting unit.

In addition, the image processing method using the millimeter wave power and phase difference detector according to another aspect of the present invention comprises the steps of receiving a millimeter wave signal in which a signal of a transmitting end is reflected, diffracted or scattered by a target through a plurality of antennas ( S10), detecting a combined signal generated by adding a signal received through the plurality of antennas and a signal received through each antenna (S20), and using the detected signal received by each antenna and the combined signal It may include the step of extracting the magnitude and phase difference information between the signals appearing between the antennas (S30).

In addition, the step of extracting the position of the transmitter or the received signal using the phase difference information between the extracted plurality of antennas (S40), and the output of the detector for each antenna using the extracted position information of the transmitter or the position information of the received signal Compensating the received signal of the antenna to be uniform (S50) and extracting the restored image by reconstructing the collected image of the imaging system based on the compensated received signal in the imaging system (S60) may be included.

As described above, the millimeter wave power and phase difference detector and the image processing method using the same according to the present invention can improve the performance of a millimeter wave detector manufactured using only a standard semiconductor process. Also, it is possible to detect a magnitude and a phase difference between the received signals of the antennas using only a power detection technique using a detector having a plurality of antennas.

In addition, by using the magnitude and phase difference between the signals collected through the plurality of antennas to determine the position of the transmitting end or the received signal, and correcting the output distortion of the signal between the antennas according to the position of the transmitting end or the received signal, the boundary surface of the target It is possible to clearly implement the millimeter wave image that appears scattered from the .

Also, it is possible to improve the image quality by enlarging the signal-to-noise ratio or dynamic region of the image signal without using image restoration through additional signal processing. In addition, by applying the millimeter wave power and phase difference detector according to the present invention to the reflected image, there is an effect that can be utilized to analyze the characteristics of electromagnetic wave materials of a measurement target through simultaneous analysis of power and phase difference.

1 is a block diagram showing a millimeter wave power and phase difference detector according to an embodiment of the present invention.
2, 3 and 4 are diagrams illustrating a signal detection unit according to an embodiment of the present invention.
5 is a diagram illustrating a position of a reception signal of an antenna according to an embodiment of the present invention.
6, 7 and 8 are diagrams illustrating output information of a detector according to a position of a received signal.
9 is a diagram illustrating an output of an antenna B in FIGS. 6, 7 and 8 .
10 is a diagram illustrating an antenna arrangement structure of a millimeter wave power and phase difference detector according to an embodiment of the present invention.
11 is a flowchart illustrating an image processing method using millimeter wave power and a phase difference detector according to an embodiment of the present invention.
12 is a flowchart illustrating in detail a step S10 of receiving the millimeter wave signal of FIG. 11 .

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated. In addition, terms such as “…unit”, “…group”, “…module”, etc. described in the specification mean a unit that processes at least one function or operation, which is implemented by hardware or software or a combination of hardware and software. can be

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

Like reference numerals in each figure indicate like elements.

1 is a block diagram showing a millimeter wave power and phase difference detector 10 according to an embodiment of the present invention. As shown in FIG. 1 , the imaging system 1 may include a power and phase difference detector 10 , a transmitter 20 , and a signal processor 30 .

The transmitter 20 generates, amplifies and transmits a millimeter wave. In addition, the power and phase difference detector 10 is transmitted from the transmitter 20 using a plurality of antennas 100 to receive a millimeter wave signal that is reflected, diffracted or scattered by a measurement object or a target 2 , and detect In addition, the signal processing unit 30 processes the signal detected by the power and phase difference detector 10 to extract image information.

The millimeter wave power and phase difference detector 10 according to an embodiment of the present invention receives a signal through the plurality of antennas 100 in the millimeter wave imaging system 1, and uses a power detection technique based on the received signal at the transmitting end. The position of (20) can be grasped, and it is used as a single pixel in the imaging system (1) to obtain a higher quality image.

In addition, the millimeter wave power and phase difference detector 10 according to an embodiment of the present invention includes a plurality of antennas 100 , a signal detection unit 200 , a phase difference extraction unit 300 , a position extraction unit 400 , and a signal correction unit 500 and a storage unit 600 may be included.

The signal detector 200 detects a millimeter wave signal received through the plurality of antennas 100 , and detects a combined signal generated by adding signals received through the plurality of antennas 100 . The signal detection unit 200 may be implemented using any one of the power distribution module 210 , the coupler module 220 , or the single-ended (SE) detection module 230 .

2, 3 and 4 are diagrams illustrating a signal detection unit 200 according to an embodiment of the present invention. That is, Figure 2 is a view showing the power distribution module 210 according to an embodiment of the present invention, Figure 3 is a view showing the coupler module 220 according to an embodiment of the present invention, Figure 4 is SE (Single- ended) is a diagram illustrating the detection module 230 .

As shown in FIG. 2 , the power distribution module 210 distributes the signals received from the antenna A 110 and the antenna B 120 through the power distributors 214 , 215 , 216 , 217 having a power distribution function, and the distributed A combined signal generated by adding the received signals of the antenna A 110 and the antenna B 120 and the received signals of the antenna A 110 and the antenna B 120 using the signal is detected.

In addition, the power distribution module 210 includes a first detector 211 , a second detector 212 , a third detector 213 , and a plurality of power distributors 214 , 215 , 216 , 217 , 218 , and 219 . . The first detector 211 detects the input signal of the antenna A 110 using the signals D _1P and D _1N distributed through the power dividers 214 and 215 respectively connected to both ends of the antenna A 110 . do.

In this case, the input signal D ₁ of the antenna A 110 detected through the first detector 211 may be expressed as in [Equation 1] below.

[Equation 1]

Here, D ₁ is an input signal of the antenna A 110 detected through the first detector 211 , and A represents the amplitude of a signal received from the antenna A 110 . That is, D ₁ represents the magnitude of the signal obtained by adding the signals D _1P and D _1N distributed through the power dividers 214 and 215 respectively connected to both ends of the antenna A 110 .

In addition, the second detector 212 uses the signals D _2P , D _2N distributed through the power dividers 216 and 217 respectively connected to both ends of the antenna B 120 , the input signal of the antenna B 120 . to detect

In this case, the input signal D ₂ of the antenna B 120 detected through the second detector 212 may be expressed as in [Equation 2] below.

[Equation 2]

Here, D ₂ is an input signal of the antenna B 120 detected through the second detector 212 , and B represents the amplitude of a signal received from the antenna B 120 . That is, D ₂ represents the magnitude of the signal obtained by adding the signals D _2P and D _2N distributed through the power dividers 216 and 217 respectively connected to both ends of the antenna B 120 .

In addition, the power divider 218 generates a combined signal D _3P by adding the distributed signal D _1P2 of the antenna A 110 and the distributed signal D _2P2 of the antenna B 120 . In addition, the power divider 219 generates a combined signal D _3N by adding the distributed signal D _1N2 of the antenna A 110 and the distributed signal D _2N2 of the antenna B 120 .

The third detector 213 adds the combined signal D _3P of the power divider 218 and the combined signal D _3N of the power divider 219 to the reception signal of the antenna A 110 and the reception of the antenna B 120 . The combined signal to which the signal is added is detected.

In this case, the magnitude of the signal detected through the third detector 213 may be expressed as in [Equation 3] below.

[Equation 3]

In addition, as shown in FIG. 3 , the coupler module 220 separates and detects signals received from the antenna A 110 and the antenna B 120 through the couplers 224 , 225 , 226 , and 227 , respectively, and the antenna A 110 . ) and a combined signal generated by adding the separated signal of the signal received from the antenna B 120 is detected.

In addition, the coupler module 220 includes a first detector 221 , a second detector 222 , a third detector 223 , a plurality of couplers 224 , 225 , 226 , 227 , and a plurality of power distributors 228 , 229).

The first detector 221 detects the received signal of the antenna A 110 using the signals D _1P and D _1N separated through the couplers 224 and 225 respectively connected to both ends of the antenna A 110 . .

At this time, the couplers 224 , 225 , 226 , and 227 are configured such that a signal passing through each transmission line has a phase change of 90 degrees (π/2). That is, the signals (D _1P , D _1N ) separated through the couplers 224 and 225 in FIG. 3 each pass through one transmission line and are in phase with the received signal of the antenna A 110 at 90 degrees (π/2). change takes place

In addition, the signals (D _1P2 , D _1N2 ) separated through the couplers (224, 225) pass through two transmission lines, respectively, and the received signal of the antenna A (110) and a phase change of 180 degrees (π) are inverted indicates the signal.

The input signal D ₁ of the antenna A 110 detected through the first detector 221 may be expressed as [Equation 4] below.

[Equation 4]

Here, D ₁ is an input signal of the antenna A 110 detected through the first detector 221 , and A represents the amplitude of a signal received from the antenna A 110 . That is, D ₁ represents the magnitude of the signal obtained by adding the signals D _1P and D _1N separated through the couplers 224 and 225 respectively connected to both ends of the antenna A 110 .

In addition, the second detector 222 detects the input signal of the antenna B 120 using the signals D _2P and D _2N separated through the couplers 226 and 227 respectively connected to both ends of the antenna B 120 . detect In this case, the input signal of the antenna B 120 detected through the second detector 222 may be expressed as in [Equation 5] below.

[Equation 5]

Here, D ₂ is an input signal of the antenna B 120 detected through the second detector 222 , and B represents the amplitude of a signal received from the antenna B 120 . That is, D ₂ represents the magnitude of a signal obtained by adding signals D _2P and D _2N separated through couplers 226 and 227 respectively connected to both ends of the antenna B 120 .

In addition, the power divider 228 generates a combined signal D _3N by adding the separated signal D _1N2 of the antenna A 110 and the separated signal D _2N2 of the antenna B 120 . At this time, the separated signals D _1N2 and D _2N2 of the antenna A 110 and the antenna B 120 are two received signals from the antenna A 110 and the antenna B 120 in the couplers 224 and 226, respectively. An inverted signal is represented by a phase change of 180 degrees (π) with the received signals of the antenna A 110 and the antenna B 120 passing through the transmission line, respectively.

In addition, the power divider 229 generates a combined signal D _3P by adding the separated signal D _1P2 of the antenna A 110 and the separated signal D _2P2 of the antenna B 120 . At this time, the separated signals D _1P2 and D _2P2 of the antenna A 110 and the antenna B 120 are two received signals from the antenna A 110 and the antenna B 120 in the couplers 225 and 227, respectively. An inverted signal is represented by a phase change of 180 degrees (π) with the received signals of the antenna A 110 and the antenna B 120 passing through the transmission line.

The third detector 223 adds the combined signal D _3N of the power divider 228 and the combined signal D _3P of the power divider 229 to the input signal of the antenna A 110 and the input of the antenna B 120 . Detects the signal to which the signal is added.

Accordingly, the magnitude of the signal detected through the third detector 223 may be expressed as in [Equation 6] below.

[Equation 6]

In addition, as shown in FIG. 4 , the SE (Single-ended) detection module 230 includes the antenna A 110 and the antenna through couplers 234 and 235 unidirectionally connected to the antenna A 110 and the antenna B 120, respectively. The received signal of B 120 is separated and detected, respectively, and the combined signal generated by adding the separated signals D _A and D _B through the couplers 234 and 235 is detected.

In addition, the SE (Single-ended) detection module 230 includes a first detector 231 , a second detector 232 , a third detector 233 , a plurality of couplers 234 , 235 and a power divider 236 . include

The first detector 231 detects an input signal of the antenna A 110 using a signal separated through the coupler 234 connected to the antenna A 110 . In this case, the input signal of the antenna A 110 detected through the first detector 231 may be expressed as in [Equation 7] below.

[Equation 7]

Here, D _A is the received signal of the antenna A 110 detected through the first detector 231 , and A represents the amplitude of the signal received from the antenna A 110 .

Also, the second detector 232 detects an input signal of the antenna B 120 using a signal separated through the coupler 235 connected to the antenna B 120 . In this case, the input signal of the antenna B 120 detected through the second detector 232 may be expressed as in [Equation 8] below.

[Equation 8]

Here, D _B is the received signal of the antenna B 120 detected through the second detector 232 , and B represents the amplitude of the signal received from the antenna B 120 .

In addition, the power divider 236 is the received signal (D _A2 ) of the antenna A 110 separated through the coupler 234, and the received signal of the antenna B 120 separated through the coupler 235 (D _B2 ) are added to generate a combined signal ( _DS ).

At this time, the received signal D _A2 of the antenna A 110 separated through the coupler 234 and the received signal D _B2 of the antenna B 120 separated through the coupler 235 are each coupler 234, 235), the received signal of the antenna A 110 and the antenna B 120 passes through two transmission lines, respectively, and a phase change of 180 degrees (π) occurs, indicating an inverted signal.

Accordingly, the magnitude of the combined signal D _S detected through the third detector 233 may be expressed as in [Equation 9] below.

[Equation 9]

The phase difference extracting unit 300 extracts a magnitude and a phase difference between signals appearing between the plurality of antennas 100 using the combined signal and the received signal of the antenna 100 detected by the signal detection unit 200 .

In addition, the phase difference extraction unit 300 extracts the difference in detection characteristics appearing within the wavelength of a millimeter wave based on the magnitude and phase difference between the signals detected by the signal detection unit 200, thereby obtaining a high signal to noise ratio (SNR). It is possible.

)와 위상차 정보(

)를 구할 수 있다.For example, in the case of the power and phase difference detector 10 using two plurality of antennas 110 and 120, the phase difference extractor 300 uses the following [Equation 10] to determine the magnitude (

) and phase difference information (

) can be obtained.

[Equation 10]

는 두 신호(P_A, P_B) 간의 크기이고,

는 위상차 정보를 나타낸다.Here, P _A and P _B are the magnitudes of signals collected by the antenna A 110 and the antenna _B 120 , and P _S is the magnitude of the combined signal obtained by adding the two signals PA and P _B . In addition,

is the magnitude between the two signals (P _A , P _B ),

represents phase difference information.

의 관계를 만족하므로 아래의 [수학식 11]과 같은 검출기 출력으로 나타낼 수 있다.When the output and voltage of the power and phase difference detector 10, which appear in the form of voltage, follow the square's law, which is a characteristic of the detector,

Since it satisfies the relationship of , it can be expressed as a detector output as in [Equation 11] below.

[Equation 11]

Here, k _A , k _B , and k _S are constants related to the reactivity of the first detectors 211 , 221 , 231 , the second detectors 212 , 222 , and 232 , and the third detectors 213 , 223 and 233 , respectively. indicates

If the reactivity of the first detectors 211 , 221 , 231 , the second detectors 212 , 222 , 232 , and the third detector 213 , 223 and 233 in the power and phase difference detector 10 is the same, k = k _S = k _A = k _B , so the phase difference can be expressed as [Equation 12] below.

[Equation 12]

=0일 때 V_S, V_A, V_B를 측정한다.In addition, when the reactivity of the first detectors 211 , 221 , 231 , the second detectors 212 , 222 , 232 , and the third detector 213 , 223 , and 233 in the power and phase difference detector 10 are different from each other, the phase difference can be expressed in the form of [Equation 13] below, and in this case, characteristic compensation can be performed using the millimeter wave transmitter 20 incident on the plane. in other words,

When =0, measure V _S , V _A , V _B .

[Equation 13]

이고,

가 되도록 출력 전압을 보상한다.From here,

ego,

The output voltage is compensated so that

와,

의 관계식을 이용하여 [수학식 13]을 정리하면, 아래의 [수학식 14]로 나타낼 수 있다.In addition,

Wow,

If [Equation 13] is arranged using the relational expression of , it can be expressed as [Equation 14] below.

[Equation 14]

)를 이용하여 송신단(20) 또는 수신 신호의 위치를 추출할 수 있다.The position extraction unit 400 includes phase difference information (

) can be used to extract the position of the transmitter 20 or the received signal.

5 is a diagram illustrating a position of a reception signal of the antenna 100 according to an embodiment of the present invention. That is, FIG. 5 is a diagram illustrating a position θ of two received signals according to a phase difference between the received signals incident on the antenna A 110 and the antenna B 120 .

As shown in FIG. 5 , the millimeter wave signal arriving at the antenna A 110 and the antenna B 120 by the distance difference d between the two reception signals incident on the antenna A 110 and the antenna B 120 . They vary in size and phase.

In this case, the distance difference (d) between the two received signals can be expressed by the following [Equation 15].

[Equation 15]

Here, d is the distance difference between the two received signals incident on the antenna A 110 and the antenna B 120, a is the distance difference between the antenna A 110 and the antenna B 120, and θ is the antenna A ( 110) and the angle of incidence of the two received signals with respect to a straight path connecting the antenna B (120).

)는 아래의 [수학식 16]과 같이 나타낼 수 있다.If rearranged based on the above [Equation 15], the phase difference (

) can be expressed as [Equation 16] below.

[Equation 16]

)를 토대로 [수학식 16]을 이용하여 송신단(20) 또는 수신 신호의 위치(θ)를 추출할 수 있다.Accordingly, the position extractor 400 determines the phase difference information (

), it is possible to extract the position θ of the transmitter 20 or the received signal using [Equation 16].

The signal correction unit 500 uses the position information of the transmitting terminal 20 or the position information of the received signal extracted through the position extracting unit 400 to obtain the received signal of the antenna 100 so that the output of the detector 10 is uniform. can be compensated

6, 7, and 8 are diagrams illustrating output information of the detector 10 according to the position of the received signal. That is, FIG. 6 is a diagram illustrating a case where the positions of the received signals incident on the antenna A 110 and the antenna B 120 are not covered by the target 2 , and FIG. 7 is the antenna B 120 . is a diagram illustrating a case in which a received signal is incident at a position partially obscured by the target 2 , and FIG. 8 is a view illustrating reception at a position where the entire antenna B 120 is obscured by the target 2 . It is a diagram showing a case where a signal is incident.

At this time, it is assumed that the received signals incident on the antenna A 110 and the antenna B 120 are incident on the detector 10 in a vertical direction, and as shown in FIGS. 6, 7 and 8 , the detector 10 moves in the direction of the arrow. Measure the signal while moving.

As shown in FIG. 6 , when the antenna A 110 and the antenna B 120 are not covered by the target 2 , the signals received from the antenna A 110 and the antenna B 120 should theoretically be the same. do.

However, in the case of FIG. 6 , the signal scattered by the object 20 is received by the antenna B 120 and does not appear the same as the received signal of the antenna A 110 as shown in the initial image.

This characteristic gradually increases as the distance between the object 20 and the antenna B 120 increases. In this case, the magnitude increase or decrease due to the scattering signal is not large, but the phase difference is severe.

Accordingly, the signal compensator 500 may compensate for the change in the signal appearing on the antenna B 120 by using the phase difference information between the antennas 100 according to the position of the transmitter 20 or the position of the received signal.

In addition, when the received signal is incident at a position where the antenna B 120 is partially obscured by the target 2 as shown in FIG. 7 , the light receiving area is reduced compared to the case of FIG. 6 in which only the phase is significantly different. A difference in signal amplitude also occurs.

The magnitude of the signal appearing on the antenna B 120 due to scattering from the end of the object 2 does not appear in proportion to the area of the reduced antenna B 120 , but the effect of the scattering signal is relatively small compared to the case of FIG. 6 . appear.

In addition, as shown in FIG. 8 , when a received signal is incident at a position where the entire antenna B 120 is covered by the target 2 , the antenna B 120 is completely covered by the target 2 , so there is no A signal should not be incident, but a relatively small signal is introduced due to a scattering characteristic at the edge of the object 2 .

At this time, the phase value has a sign opposite to that of FIG. 6 because the direction in which the scattered signal is received is opposite to that of FIG. 6 . Accordingly, the signal compensator 500 may compensate the signal obtained from the antenna B 120 based on this.

In addition, the storage unit 600 stores the millimeter wave signal and the combined signal of the plurality of antennas 100 detected by the signal detection unit 200 . In addition, the storage unit 600 stores the magnitude and phase difference information between signals appearing between the plurality of antennas 100 extracted by the phase difference extracting unit 300 .

In addition, the storage unit 600 stores the position information of the transmitting terminal 20 or the received signal extracted by the position extracting unit 400 and compensation information of each antenna 100 calculated by the signal correcting unit 500 .

9 is a diagram illustrating an output of the antenna B 120 in FIGS. 6, 7 and 8 . That is, the upper initial image is a view showing that the antenna B 120 outputs an unclear image state due to the influence of the scattering signal due to the target 2 in FIGS. 6, 7 and 8, and the lower image The restored image is corrected by the signal correction unit 500 to indicate an image output with clear image boundaries.

As shown in FIG. 9 , it can be seen that the dynamic range enlargement and signal-to-noise ratio characteristics are improved in the reconstructed image obtained by correcting the initial image obtained through the antenna B 120 . At this time, due to the structure of the antenna 100 of the detector 10 disposed in the left and right directions, image characteristics as shown in FIG. 9 can be restored through scanning in the left and right directions.

10 is a diagram illustrating an arrangement structure of the antenna 100 of the millimeter wave power and phase difference detector 10 according to an embodiment of the present invention. In the millimeter wave power and phase difference detector 10 according to an embodiment of the present invention, the plurality of antennas 100 may be arranged in a vertical or horizontal direction.

In addition, the plurality of antennas 100 prevent restrictions on the movement direction of the detector 10 and three antennas 100 are arranged in a triangle as shown in FIG. 10 in order to secure omnidirectional characteristics, The four antennas 100 may be disposed in a form positioned vertically, horizontally and vertically.

As described above, the millimeter wave power and phase difference detector 10 according to an embodiment of the present invention detects the magnitude and phase difference between signals flowing into the antenna 100 in the millimeter wave imaging system 1, and is incident on the antenna 100. The direction of the signal can be calculated.

In addition, by providing a signal to noise ratio (SNR) improvement characteristic, it is possible to solve the image problem in which the outer shell of the object is spread due to the scattering characteristic appearing at the interface of the target 2, and to obtain a clear image. there is an effect

In addition, resolution below a millimeter wave wavelength is possible by providing additional information in the conventional power detection method, thereby improving image quality. In addition, calibration is possible at a level below the wavelength.

11 is a flowchart illustrating an image processing method using the millimeter wave power and phase difference detector 10 according to an embodiment of the present invention, and FIG. 12 is a flowchart showing in detail the step (S10) of receiving the millimeter wave signal of FIG. to be.

The image processing method according to an embodiment of the present invention comprises the steps of receiving a millimeter wave signal in which a signal of the transmitter 20 is reflected, diffracted or scattered by a target 2 through a plurality of antennas 100 (S10) ) and a signal received through the plurality of antennas 100 and a signal received through each antenna 100 to detect a combined signal generated by adding (S20) and the detected reception signal of each antenna 100 and extracting magnitude and phase difference information between signals appearing between the plurality of antennas 100 using the combined signal (S30).

At this time, the receiving of the millimeter wave signal (S10) is performed according to the position of the transmitter 20 or the received signal with respect to each antenna 100 while moving the plurality of antennas 100 and the relative position of the object 2 . A signal of each antenna 100 that changes is received.

That is, the step of receiving the millimeter wave signal (S10) is to receive the signal at a position where the received signal received by the plurality of antennas 100 is not covered by the object 2 while moving the plurality of antennas 100. Step S11 is included.

In addition, while moving the plurality of antennas 100 , receiving a signal at a position where a received signal received by one of the plurality of antennas 100 is partially covered by the object 2 ( S12 ) and a plurality of It may include a step (S13) of receiving a signal at a position where the entire received signal received by any one antenna 100 among the plurality of antennas 100 while moving the antenna 100 is covered by the object 2 (S13). have.

In addition, the image processing method according to an embodiment of the present invention includes the steps of extracting the position of the transmitter 20 or the received signal using the extracted phase difference information between the plurality of antennas 100 ( S40 ), and the extracted transmitter 20 . Compensating the received signal of the antenna 100 so that the output of the detector 10 for each antenna 100 is uniform using the position information of ) or the position information of the received signal (S50) and in the imaging system (1) It may include extracting the restored image by restoring the collected image of the imaging system 1 based on the compensated received signal (S60).

In this case, the step of compensating for the received signal of the antenna 100 ( S50 ) is a scattering signal generated according to the position of the transmitter 20 or the received signal with respect to the plurality of antennas 100 and the relative position of the object 2 . The received signal of the antenna 100 is compensated by detecting a difference between the magnitude and the phase of .

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be easily changed by a person skilled in the art from the embodiment of the present invention to equivalent Including all changes to the extent recognized as such.

1: image system 2: target
10: power and phase difference detector 20: transmitting end
30: signal processing stage 100: antenna
110: antenna A 120: antenna B
130: antenna C 140: antenna D
200: signal detection unit 210: power distribution module
211: first detector 212: second detector
213: third detector
214, 215, 216, 217, 218, 219: power divider
220: coupler module 221: first detector
222: second detector 223: third detector
224, 225, 226, 227: coupler
228, 229: power divider
230: SE (Single-ended) detection module
231: first detector 232: second detector
233: third detector 234, 235: coupler
236: power divider 300: phase difference extraction unit
400: position extraction unit 500: signal correction unit
600: storage

Claims (17)

A millimeter wave power and phase difference detector for receiving millimeter wave signals through a plurality of antennas to obtain clear image information from an imaging system,
a plurality of antennas for receiving a millimeter wave signal within a predetermined frequency bandwidth in which a signal of a transmitting end is reflected, diffracted, or scattered by a target;
a signal detector configured to add a signal received through the plurality of antennas and a signal received through each antenna, respectively, to detect a combined signal of a vector form of a very high frequency component; and
Millimeter wave power and Phase difference detector.
According to claim 1,
Millimeter wave power and phase difference detector, characterized in that it further comprises a position extractor for extracting the position of the transmitter or the received signal by using the phase difference information between the plurality of antennas extracted by the phase difference extractor.

3. The method of claim 2,
The position extractor extracts the position of the transmitter or the received signal using the relational expression set to the phase difference information between the plurality of antennas extracted by the phase difference extracting unit, the distance between the plurality of antennas, and the wavelength of the received signal received from the plurality of antennas. Millimeter wave power and phase difference detector, characterized in that.
3. The method of claim 2,
Millimeter wave power, characterized in that it further comprises a signal correction unit for compensating the received signal of the antenna so that the output of the detector for each antenna is uniform by using the position information of the transmitter or the position information of the received signal extracted through the position extraction unit. and a phase difference detector.
The method of claim 1,
The signal detection unit
A first power divider and a second power divider each connected to both ends of the antenna A, which is one of the plurality of antennas, to distribute the received signal of the antenna A;
a first detector for detecting an input signal of the antenna A using the received signal distributed through the first power divider and the second power divider;
a third power divider and a fourth power divider each connected to both ends of an antenna B, which is the other one of the plurality of antennas, to distribute the received signal of the antenna B;
a second detector for detecting an input signal of the antenna B using the received signal distributed through the third power divider and the fourth power divider;
a fifth power divider for generating a combined signal by adding the signals distributed through the first power divider and the third power divider;
a sixth power divider for generating a combined signal by adding the signals distributed through the second power divider and the fourth power divider; and
and a third detector for detecting a combined signal obtained by adding the input signals of antenna A and antenna B by using the combined signal of the fifth power divider and the sixth power divider.
The method of claim 1,
The signal detection unit
A first coupler and a second coupler respectively connected to both ends of the antenna A, which is one of the plurality of antennas, to separate the received signal of the antenna A;
a first detector for detecting an input signal of the antenna A using the received signal separated through the first coupler and the second coupler;
A third coupler and a fourth coupler respectively connected to both ends of the antenna B, which is the other one of the plurality of antennas, to separate the received signal of the antenna B;
a second detector for detecting the input signal of the antenna B using the received signal separated through the third coupler and the fourth coupler;
A first power divider for generating a combined signal by adding the signals separated through the first coupler and the third coupler,
a second power divider for generating a combined signal by adding the signals separated through the second coupler and the fourth coupler; and
and a third detector for detecting a combined signal obtained by adding the input signals of antenna A and antenna B using the combined signal of the first power divider and the second power divider.
According to claim 1,
The signal detection unit
A first coupler connected to antenna A, which is one of the plurality of antennas, to separate the received signal of the antenna A;
A first detector for detecting the input signal of the antenna A using the received signal separated through the first coupler,
a second coupler connected to antenna B, which is another one of the plurality of antennas, to separate the received signal of the antenna B;
a second detector for detecting the input signal of the antenna B using the received signal separated through the second coupler;
a power divider for generating a combined signal by adding signals separated through the first coupler and the second coupler; and
and a third detector for detecting a combined signal obtained by adding the input signals of antenna A and antenna B using the combined signal of the power divider.
According to claim 1,
The phase difference extracting unit extracts the phase difference between the antennas using a relational expression set as the magnitude of each received signal received from the plurality of antennas and the magnitude of the combined signal to which each received signal received from the plurality of antennas is added, millimeter Wave power and phase difference detector.
According to claim 1,
The plurality of antennas is a millimeter wave power and phase difference detector, characterized in that it is arranged in a line in the form of up and down or left and right on the detector body.
According to claim 1,
The plurality of antennas are millimeter wave power and phase difference detectors, characterized in that three antennas are arranged in a triangle in the detector body to prevent restrictions on the movement direction of the detector and to secure omnidirectional characteristics.
According to claim 1,
Millimeter wave power and phase difference detector, characterized in that the plurality of antennas are arranged in a form in which four antennas are located in the upper, lower, left and right sides of the detector body in order to prevent restrictions on the movement direction of the detector and to secure omnidirectional characteristics.
An image processing method in which a millimeter wave power and phase difference detector equipped with a plurality of antennas in an image system extracts a position of a transmitter or a received signal, and processes image information based on the extracted position information, the image processing method comprising:
Receiving a millimeter wave signal within a predetermined frequency bandwidth in which a signal of a transmitter is reflected, diffracted, or scattered by a target through the plurality of antennas (S10);
detecting a combined signal of a vector form of a very high frequency component generated by adding a signal received through the plurality of antennas and a signal received through each antenna (S20);
extracting magnitude and phase difference information between signals appearing between a plurality of antennas using a power detection technique for the detected received signal and the combined signal of each antenna (S30); and
and extracting a position of a transmitting end or a receiving signal by using the extracted phase difference information between the plurality of antennas (S40).
13. The method of claim 12,
After the step (S40) of extracting the position of the transmitting end or the received signal
Compensating the received signal of the antenna so that the output of the detector for each antenna is uniform by using the extracted location information of the transmitter or the location information of the received signal (S50).
14. The method of claim 13,
Compensating the received signal of the antenna (S50) is
An image processing method for compensating for a received signal of an antenna by detecting a difference in magnitude and phase of a scattering signal that is generated according to a position of a transmitter or a received signal with respect to a plurality of antennas and a relative position of an object.
14. The method of claim 13,
After compensating the received signal of the antenna (S50)
The image processing method further comprising the step (S60) of extracting the restored image by restoring the image collected by the image system based on the received signal compensated by the image system.
13. The method of claim 12,
The receiving of the millimeter wave signal (S10) comprises receiving a signal of each antenna that changes according to a position of a transmitter or a reception signal for each antenna and a relative position of an object while moving a plurality of antennas. Way.
17. The method of claim 16,
Receiving the millimeter wave signal (S10)
Receiving a signal at a position where the received signal received by the plurality of antennas is not covered by the object while moving the plurality of antennas (S11);
Receiving a signal at a position where a received signal received by any one of the plurality of antennas is partially covered by an object while moving the plurality of antennas (S12), and
and receiving (S13) a signal at a position where the entire received signal received by any one antenna among the plurality of antennas is obscured by an object while moving the plurality of antennas.

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