KR101839044B1 - W-Band Millimeter Wave Target Detection Apparatus using Dual-Polarized Wave and Method thereof - Google Patents

Abstract

According to the present invention disclosed are an apparatus and a method for detecting a target by using dual-polarized waves. In particular, the present invention relates to an apparatus for detecting a target by using dual-polarized waves, wherein the apparatus classifies a reception signal into a first reflection signal and a second reflection signal according to the number of reflections by using dual-polarized waves, and determines whether the reception signal is a target signal reflected from a target in consideration of a difference in magnitudes between the classified first reflection signal and second reflection signal. The apparatus of the present invention comprises: an antenna unit which radiates a signal for detecting a target and receives a reception signal received by reflecting the radiated signal; a comparator which separates the reception signal into at least polarized signals of a first group and polarized signals of a second group in consideration of the polarization direction of the reception signal, and adds the polarized signals belonging to a corresponding group to the first group and the second group; and a signal processing unit which classifies the reception signal into a first reflection signal and a second reflection signal according to the number of reflections by using the sum of the polarized signals of the first group and the polarized signals of the second group, and determines whether the reception signal is a target signal reflected from the target by comparing a difference in magnitudes between the classified first reflection signal and second reflection signal with a pre-stored reference value.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a W-band millimeter wave target detection apparatus and a W-band millimeter wave target detection apparatus using dual polarization,

The present invention relates to an apparatus and method for detecting a target using a polarized signal. And more particularly, to an apparatus and method for detecting a target using different polarized signals.

Conventional terrestrial target tracking detectors use infrared sensors and detect targets using transmit frequencies in the ku (12-18Ghz) and ka (26-40Ghz) bands mounted on a guided weapon. The terrestrial target tracking searcher can receive polarized signals in various directions using a polarized antenna having a polarization characteristic unique to each antenna, and can accurately track the target using the polarized antenna. Target searchers are increasingly required for miniaturization and high resolution target identification. For this purpose, a searcher for the W band (56 ~ 110Ghz), which is a higher frequency band than ku (12 ~ 18Ghz) Development is required.

However, in the case of using the W band, it is difficult to implement the antenna beam by the slot array method because an antenna having a small size is required due to high frequency characteristics than the ku and ka bands.

In general, the target location search method of the target tracking searcher can be largely a cone search method and a monopulse search method. The cone search method is a method of tracking the target around the target instead of the center of the target. There is a risk of misjudging the location of the target when the strength is arbitrarily adjusted to a greater degree. For this reason, current radar searchers mainly use monopulse search techniques.

A target seeker using a monopulse search technique can receive not only the horizontal polarization but also the vertically polarized signal due to the relative motion between the guided weapon and the target when tracking the target. There is a problem that it is difficult to separate the clutter signal fundamentally from the reception signal in which the target signal and the clutter signal are mixed.

Therefore, it is required to develop a technique for effectively detecting a target signal by separating a target signal and a clutter signal from a received signal using dual polarization.

Korean Patent Publication No. 10-2004-0118326 (published)

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the above-mentioned problems, and a target detection apparatus using dual polarization is disclosed. Disclosed is a device and method for detecting a target using dual polarization, which distinguishes between a target signal and a clutter signal using different polarized signals.

In order to achieve the above object, the present invention provides a target detection apparatus using a dual polarization, comprising: a target antenna for emitting a signal for detecting a target; an antenna for receiving a received signal reflected by the emitted signal; part; Separating the polarized signals into at least a first group of polarized signals and a second group of polarized signals in consideration of the polarization direction of the received signal and summing the polarized signals belonging to the group for each of the first group and the second group A comparator; And classifying the received signal as a first reflected signal and a second reflected signal according to the number of times of reflection using the summed polarized signals of the first group and the polarized signals of the second group, And a signal processor for comparing the magnitude of the second reflected signal with a previously stored reference value to determine whether the received signal is a target signal reflected from the target.

 Preferably, the polarization directions of the separated groups are orthogonal to each other.

The first reflection signal may be a reflection signal in which the number of reflection times is an odd number of circuits, and the second reflection signal may be provided such that the reflection number is an even number circuit reflection signal.

In the present invention, the antenna unit includes: a circulator for branching the radiated signal and the received signal; And may receive the received signal by branching with the emitted signal.

In the present invention, the comparator may include a polarization separator that separates the reflected signal into at least the first group of polarized signals and the second group of polarized signals in consideration of the polarization direction. And the polarization signals belonging to the group can be added to the separated first group and the second group.

The comparator may further include: a first comparator for summing the separated first group of polarized signals; And a second comparator for summing the separated second group of polarized signals; And may sum up the separated first group of polarized signals and the second group of polarized signals.

The signal processor may further include a signal calculator for calculating a magnitude difference between the first reflected signal and the second reflected signal by using the summed polarized signals of the first group and the polarized signals of the second group; A signal comparator comparing the calculated magnitude difference with the pre-stored reference value; And may determine the received signal as the target signal when the size difference is smaller than the reference value.

In the present invention, the signal processing unit may include: a power ratio measuring unit that measures a power ratio of the target signal among the received signals; And determine whether the received signal is a target signal reflected from the target in consideration of the measured power ratio.

According to another aspect of the present invention, there is provided a method of detecting a target using dual polarization, comprising: emitting a signal for detecting a target and receiving a received signal reflected by the emitted signal; Separating at least a first group of polarized signals into a second group of polarized signals in consideration of a polarization direction of the received signal; Summing the polarized signals belonging to the group to the separated first group and the second group; And using the summed polarized signals of the first group and the second group of polarized signals to determine whether the received signal is a target signal reflected from the target; .

In the present invention, the determining may include classifying the received signal as a first reflected signal and a second reflected signal according to the number of times of reflection; Calculating a size difference between the classified first and second reflected signals; Comparing the calculated size difference with the pre-stored reference value; And may determine the received signal as the target signal when the calculated size difference is smaller than the reference value.

Preferably, the polarization directions of the groups may be orthogonal to each other.

The first reflection signal may be a reflection signal in which the number of reflection times is an odd number of circuits, and the second reflection signal may be provided such that the reflection number is an even number circuit reflection signal.

The present invention also discloses a computer program stored in a computer-readable recording medium for causing a computer to execute the method of detecting a target using dual polarization.

According to the present invention, a target signal can be accurately distinguished from a received signal by using a plurality of polarized signals.

Particularly, a target signal can be effectively determined by classifying a received signal based on the number of reflections using a dual polarized signal.

1 is a block diagram of a target detection apparatus using dual polarization according to an embodiment of the present invention.
2 is an enlarged block diagram of a comparator in the embodiment of FIG.
Figure 3 is another embodiment of a comparator in the embodiment of Figure 1;
4 is an enlarged block diagram of the signal processing unit in the embodiment of FIG.
5 is an exemplary view for explaining reflection characteristics of a reflector.
6 is a flowchart of a method of detecting a target using dual polarization of the present invention.
7 is an enlarged flow chart of steps determined in the embodiment of Fig.
8 is a flowchart of a method of detecting a target using dual polarization according to another embodiment of the present invention.
9 is a block diagram of a target detection apparatus using dual polarization according to another embodiment of the present invention.
10 is an exemplary diagram illustrating a situation in which the target detection apparatus using dual polarization of the present invention tracks a ground target.

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

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description with reference to the accompanying drawings, the same or corresponding components are denoted by the same reference numerals, and a duplicate description thereof will be omitted.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope. The singular expressions include plural expressions unless the context clearly dictates otherwise. Each of the steps described below may be implemented by one or a plurality of software modules, or hardware that is responsible for each function, or a combination of software and hardware.

Specific meanings and examples of the terms will be described below in accordance with the order of each drawing.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a configuration of a target detection apparatus using dual polarization according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a target detection device 10 using dual polarization according to an embodiment of the present invention. Will be described with reference to FIG.

The target detection apparatus 10 using dual polarization includes an antenna unit 100, a receiver, a comparator 300, and a signal processing unit 500.

For example, the dual-polarized target detection apparatus 10 separates a dual polarized component from a received signal in which the radiated signal is reflected and received, and uses the separated dual polarized signal to determine whether the received signal is a target Signal. The target detection device 10 using the dual polarization can detect the target more precisely than the conventional microwave band by detecting the target using the W-band millimeter wave having the miniaturization and the high resolution target identification function. The target detection apparatus 10 using dual polarization of the present invention can adaptively detect a target using a signal of a microwave band or a very high frequency band (millimeter wave band). Also, the signal used by the target angle estimation apparatus 10 using the dual polarization of the present invention may be a pulse signal to which the monopulse technique is applied.

The antenna unit 100 includes a sending unit and a circulator.

The antenna unit 100 emits a signal for detecting a target, and receives the received signal reflected by the emitted signal.

For example, the antenna unit 100 may include a waveguide slot array antenna or a reflector antenna to precisely track a target using a monopulse technique. The antenna unit 100 may include a main reflector, a sub-reflector, and a feed horn that can use a Cassegrain antenna with less influence of electromagnetic interference and rotate with the same rotation axis. Alternatively, the antenna unit 100 may have a structure in which only the main reflector is rotated.

The transmitting unit transmits a transmitting signal for detecting the target. The signal for detecting the target includes the signal to which the pulse technique is applied and the signal to which the mono pulse technique using the single pulse is applied. Further, the transmission signal may be a signal of the Ku and ka bands, and may include a signal of a W band or a millimeter wave (a very high frequency region).

The circulator branches the radiation signal of the transmission unit and the reception signal received by the antenna unit 100 to prevent signal cross talk. The circulator can switch the transmitting and receiving function of the antenna to detect the target using a single antenna.

The comparator 300 includes a polarization separator 320, a first comparator 340 and a second comparator 360.

The comparator 300 separates at least the first group of polarized signals into the second group of polarized signals in consideration of the polarization direction of the received signal received by the antenna unit 100, And adds the weights to the polarized signals belonging to the group for each of them. The comparator 300 may sum the polarization signals belonging to the first group and the second group without applying a weight to each of the first and second groups. The comparator 200 may further include a phase shifter and a plurality of hybrid couplers. Will be described with reference to FIG.

The polarized wave separator 320 may separate at least the first group of polarized signals and the second group of polarized signals in consideration of the polarization direction of the reflected signal. In the present invention, the first group and the second group are examples of polarization directions to be separated, and the number of groups to be separated according to a larger number of polarization directions can be increased. The first group may be a horizontal polarization signal and the second group may be a vertical polarization signal.

For example, the polarization separator 320 may separate the reflected signal into a horizontal polarization signal and a vertical polarization signal. That is, the directions in which the polarized signals are polarized in the polarized wave separator 320 may be orthogonal to each other, and the polarized wave separator may include an orthogonal mode transducer.

The first comparator 340 adds the weights to the separated first group of polarized signals and adds them together. For example, the first comparator 340 may include a plurality of hybrid couplers, and may use the hybrid coupler to weight and sum the first group of polarized signals.

In one embodiment, the first comparator 340 includes a first hybrid coupler 342, a second hybrid coupler 344, a third hybrid coupler 346 and a fourth hybrid coupler 348, And outputs a summed polarized signal. Each hybrid coupler can weight the horizontal polarization signals separated from the plurality of received signals received by the antenna unit 100 and add the weights. Will be described with reference to FIG.

For example, the first comparator 340 applies weighting to the separated horizontal polarized signals and adds them together. This means that the four horizontal polarizers are used to sum all the received horizontal polarized signals or to add them in the azimuth direction or the elevation angle May be subtracted from each other. That is, the sum signal of the horizontal polarized signals may be A + B + C + D and the azimuth difference signal may be (A + C) - (B + D) . The intensity of the signal can be expressed in voltage, current, or power units.

The second comparator 360 adds the weights to the separated second group of polarized signals and adds them together. For example, the second comparator 360 may comprise a plurality of hybrid couplers, and may use a hybrid coupler to weight and sum the polarizations of the second group of polarized signals. The second comparator 360 applies weighting to the separated vertically polarized signals and adds up the signals to sum up the received vertical polarized signals using four hybrid couplers or to sum the received vertical polarized signals using the four hybrid couplers, May be subtracted from each other. That is, the sum signal of the vertically polarized signals may be A + B + C + D and the azimuth difference signal may be (A + C) - (B + D) . The intensity of the signal can be expressed in voltage, current, or power units.

In the present invention, the target detection apparatus using dual polarization can track the target by driving the antenna unit 100 in a direction in which the values of the azimuth difference signal and the angle difference signal output from the comparator 300 are canceled. The target detection apparatus using dual polarization of the present invention detects a target using only the sum signal A + B + C + D of the first comparator 340 and the second comparator 360 among the output signals of the comparator 300 . Will be described with reference to FIG.

The signal processing unit 500 includes a signal calculating unit 520, a signal comparing unit 540, and a power ratio measuring unit 560. The signal processor 500 classifies the received signal into a first reflected signal and a second reflected signal according to the number of reflections using the polarized signals summed for the corresponding group output from the comparator 300, And the magnitude of the second reflected signal to determine whether the received signal is a target signal.

For example, the reflection signal of the first group may be provided so that the number of reflection is an odd number of circuit-formed reflection signals, and the reflection signal of the second group may be provided so that the number of reflection is an even number-formed reflection signal. The signal processor 500 can determine whether the received signal is a target signal reflected from the target by separating the target and the clutter using the size difference of each of the odd and even circuit formed reflection signals.

The signal calculator 520 classifies the received signal into a first reflected signal and a second reflected signal using the first group of polarized signals and the second group of polarized signals summed in the comparator 300, The magnitude of the signal and the second reflected signal can be calculated. The magnitude of the power of the first and second reflected signals is obtained as follows.

Here, Eodd denotes a reflection signal having an odd number of reflection times. HH denotes the power intensity of a channel received as a horizontal polarization signal after being reflected after transmission of a horizontal polarization signal, VV denotes a power intensity of a channel received as a vertical polarization signal after being reflected after transmission of a vertical polarization signal, . In one embodiment, when only a horizontal polarization signal is transmitted without transmitting a vertical polarization signal, since there is no received power in the VV channel, the size of the reflection signal having an odd number of reflection times is as follows.

Here, Eodd denotes a reflection signal in which the number of reflection is an odd number of circuits as shown in Equation (1). HH denotes the power of a channel received as a horizontally polarized signal at the time of reception after being reflected after transmission of the horizontally polarized signal. Generally, in the case of the ground clutter, the intensity of the reflected signal reflected by the odd-numbered circuit is measured to be greater than the intensity of the reflected signal evenly reflected by the even-numbered circuit. In the case of the target, Are almost the same. The magnitude of the reflected signal of the even-numbered circuit can be obtained using Equation (3).

Here, Eeven denotes a reflection signal having an even number of reflection times. HH denotes the power intensity of a channel received as a horizontal polarization signal after being reflected after transmission of a horizontal polarization signal, VV denotes a power intensity of a channel received as a vertical polarization signal after being reflected after transmission of a vertical polarization signal, And HV denotes a power intensity of a channel that is horizontally polarized after being transmitted and received as a vertically polarized signal upon reception. In one embodiment, when only the horizontal polarization signal is transmitted without transmitting the vertical polarization signal, since there is no received power in the VV channel, the magnitude of the reflection signal having an even number of reflection times is as follows.

Here, Eeven denotes a reflection signal having an even number of reflection times. HH denotes the power of a channel received as a horizontal polarization signal after being reflected after transmission of a horizontal polarization signal, HV denotes a power intensity of a channel received as a vertical polarization signal after reflection of a horizontal polarization signal, .

The signal calculator 520 calculates the power of the reflected signal reflected by the odd-numbered circuits using the first group of polarized signals as described above in Equations 1 to 4, and outputs the first group of polarized signals and the second group of polarized signals The power of the reflected signal evenly reflected by the even-numbered circuit can be calculated using the polarized signals, and the size difference between the odd-number circuit-formed reflection signal and the even-number circuit-formed reflection signal can be calculated.

Referring to FIG. 5, the clutter and the target detected by the target detection apparatus 10 using dual polarization can be modeled as three reflectors having a predetermined reflection characteristic as follows. The reflector includes a flat plate 920, a trihedral 940, and a dihedral 960.

The earth clutter can be modeled as a flat plate (920), and the target can be modeled as a combination of flat plate (920), trihedral (940) and dihedral (960). The flat plate 920 and the trihedral 940 reflector are reflectors exhibiting an odd number of times of reflection characteristics, and the Dihedral 960 is a reflector exhibiting an even number of times of reflection characteristics. The earth clutter is modeled as a flat plate (920), and has a reflector characteristic excellent in an odd number of times reflection characteristic. The target is modeled with a combination of Flat plate (920), Trihedral (940), and Dihedral (960), and the even and odd reflection properties are almost equivalent.

The signal comparator 540 compares the magnitude difference between the first and second reflected signals calculated by the signal calculator 520 with previously stored reference values. The pre-stored baseline value is the experimentally obtained clutter judgment value from the transmission test of the topography of the target detection apparatus 10 using the bi-polarized wave through the pre-simulated experimentation. In other words, it refers to a value obtained by storing the magnitude difference value of the reflection signal reflected by the odd number of times of the signal reflected from the terrain of the terrain where the guided weapon is passed through and the reflected signal of the even number circuit together with the GPS coordinates of the area. The signal processor 500 compares the difference between the magnitudes of the first and second reflected signals and the previously stored reference value in the signal comparator 540, and when the size difference between the first and second reflected signals is smaller than the previously stored reference value, As a target signal. That is, the signal processing unit 500 uses the fact that the signal reflected from the target does not have a difference in magnitude between the magnitude of the reflected signal in which the number of times of reflection is formed and the magnitude of the reflected signal in which the number of times of reflection is even, Can be determined.

The power ratio measuring unit 560 measures the power ratio of the target signal among the received signals.

For example, the power ratio of the target signal can be obtained from the power of the target signal / the power of the clutter signal. The signal comparator 540 compares the difference between the magnitudes of the first and second reflected signals and the previously stored reference value to determine whether the difference between the magnitudes of the first and second reflected signals is smaller than the reference value, It is difficult to detect the target using the target signal when the power ratio occupied by the entire received signal is low. Therefore, it is possible to measure the signal ratio (Signal Clutter Ratio, SCR) between the target signal and the clutter signal, and determine the received signal as a valid target signal only when the signal ratio is greater than or equal to a predetermined threshold value. The power ratio of the target signal and the clutter signal (Signal Clutter Ratio, SCR) can be calculated considering the power ratio occupied by the target signal in the entire received signal. In the present invention, the predetermined threshold value may be determined to be 20 db. That is, the signal processor 500 determines whether the size difference between the first and second reflected signals is smaller than the previously stored reference value, and the signal ratio (SCR) between the target signal and the clutter signal in the received signal is 20 db or more The signal can be determined as the target signal.

2 is an enlarged block diagram of a comparator in the embodiment of FIG.

The comparator 300 includes a polarization separator 320, a first comparator 340 and a second comparator 360.

The comparator 300 separates at least the first group of polarized signals and the second group of polarized signals into the first group and the second group in consideration of the polarization direction of the reflected signal received at the antenna unit 100, And adds the weights to the polarized signals belonging to the group for each of them. The redundancy of the comparator 300 is the same as described above and will be omitted.

Figure 3 is another embodiment of a comparator in the embodiment of Figure 1;

The first comparator 340 and the second comparator 360 include a first hybrid coupler 342, a second hybrid coupler 344, a third hybrid coupler 346 and a fourth hybrid coupler 348, It is possible to output a summed polarization signal to which weights are applied to the output channels. Each hybrid coupler weights the polarization signals received by the antenna by applying a plurality of reflected signals to the polarized signals.

For example, the first hybrid coupler 342 and the second hybrid coupler 344 apply weights to the reflected signals in the elevation angle direction received from the antenna unit 100 and add the weights. That is, the first hybrid coupler 342 outputs the (A + B) and (A-B) signals, and the second hybrid coupler 344 outputs the (C + D) and (C-D) signals.

In addition, the third hybrid coupler 346 receives the (C + D) signal from the second hybrid coupler 344 at an intersection, applies the weights to the signals, and (A + B) + (C + D) B) - (C + D). The fourth hybrid coupler 348 receives the (A-B) signal from the first hybrid coupler 342 and outputs the (A + C) - (B + D) signal. The target detection apparatus 10 using dual polarization can use only the sum signal of the polarized signals belonging to the group for the first group and the second group among the output signals of the comparator 300. [

4 is an enlarged block diagram of the signal processing unit in the embodiment of FIG.

The signal processing unit 500 includes a signal calculating unit 520, a signal comparing unit 540, and a power ratio measuring unit 560. The signal processor 500 classifies the received signal into a first reflected signal and a second reflected signal according to the number of times of reflection using the polarized signals summed for the corresponding group output from the comparator 300, The magnitude difference of the two reflected signals can be used to determine whether the received signal is a target signal reflected from the target. Duplicate matters to the signal processing unit 500 are as described above and will be omitted.

5 is an exemplary view for explaining reflection characteristics of a reflector.

The clutter and the target detected by the target detection device 10 using dual polarization can be modeled as three reflectors having a predetermined reflection characteristic as shown in FIG. The reflector includes a flat plate 920, a trihedral 940, and a dihedral 960. The flat plate 920 is a plate, the trihedral 940 is a triple-sided reflector, and the dihedral 960 is an up- It can mean a reflector with two planes.

The earth clutter can be modeled as a flat plate (920), and the target can be modeled as a combination of flat plate (920), trihedral (940) and dihedral (960). The flat plate 920 and the trihedral 940 reflector are reflectors exhibiting an odd number of times of reflection characteristics, and the Dihedral 960 is a reflector exhibiting an even number of times of reflection characteristics. The earth clutter is modeled as a flat plate (920), and has a reflector characteristic excellent in an odd number of times reflection characteristic. The target is modeled with a combination of Flat plate (920), Trihedral (940), and Dihedral (960), and the even and odd reflection properties are almost equivalent.

6 is a flowchart of a method of detecting a target using dual polarization of the present invention.

The target detection method using dual polarization includes the following steps that are performed in a time-series manner in a target detection apparatus using dual polarization.

In S100, the antenna unit 100 receives a reception signal in which a radiation signal is reflected and received.

For example, the antenna unit 100 may include a horn antenna, a dipole antenna, a monopole antenna, and a patch antenna, and the antenna unit 100 may be disposed on the top, bottom, left, and right sides of the target detection device 10 using dual polarization. have. The antenna unit 100 may include an antenna for receiving only a polarized wave signal having a predetermined polarization direction, and may include a circulator for branching the transmission signal and the reception signal. The redundant matters with respect to the antenna unit 100 are as described above and will be omitted.

In S200, the polarization separator 320 separates at least the first group of polarized signals and the second group of polarized signals in consideration of the polarization direction of the received signal.

For example, the polarization separator 320 may include an orthogonal mode transducer and a phase shifter, and the polarization directions may be orthogonal to each other. The polarized wave separator 320 is the same as described above, and thus will not be described.

In step S300, the comparator 300 separates the received signal received from the antenna unit 100 into the first group of polarized signals and the second group of polarized signals, and sums each of the separated polarized signals of the corresponding group . The redundancy of the comparator 300 is the same as described above and will be omitted.

In S500, the signal processing unit 500 includes a signal calculation unit 520, a signal comparison unit 540, and a power ratio measurement unit 560. The signal processor 500 classifies the received signal into a first reflection signal and a second reflection signal different in the number of reflection by using the polarized signals summed by the corresponding group output from the comparator 300, 2 < / RTI > difference of the reflected signal to determine whether the received signal is a target signal. Duplicate matters to the signal processing unit 500 are as described above and will be omitted.

7 is an enlarged flow chart of steps determined in the embodiment of Fig.

In step S520, the signal processor 500 may classify the received signal into a first reflected signal and a second reflected signal according to the number of times of reflection. The first reflection signal may be a reflection signal in which the number of reflection is an odd number of circuits and the second reflection signal may be provided so that the number of reflection is a reflection signal formed in an even number of circuits.

In S530, the signal calculator 530 may calculate the magnitudes of the first and second reflected signals. The process of calculating the magnitudes of the first and second reflected signals using the first and second groups of polarized signals is as described above.

In step S540, the signal comparator 540 may compare the size difference between the first and second reflected signals with the stored reference frame. The signal processor 500 may determine the received signal as a target signal when the size difference between the first and second reflected signals is smaller than a previously stored reference value.

8 is a flowchart of a target detection method according to another embodiment of the present invention.

Referring to FIG. 8, the target detection apparatus 10 using dual polarization transmits a horizontal polarization signal (S720), receives the reflected signal received when the transmitted horizontal polarization signal is reflected from the target or clutter, (S740).

Once the target is detected, the target detection apparatus 10 using dual polarization detects the reflected signal having the number of reflections according to the number of reflections and the number of reflections having the number of reflections formed with the odd number of circuits, using the vertical and horizontal polarization signals, , And calculates the size of each of the reflected signals (S760). The target detection apparatus 10 using dual polarization calculates the size difference by using the size of each of the calculated reflection signals (S780), compares the calculated size difference with a previously stored reference value (S790) And the magnitude difference between the odd-numbered circuit-formed reflection signals is smaller than the previously stored reference value (S820). The target detection apparatus 10 using dual polarization measures the power ratio occupied in the received signal by the estimated target signal (S840). If it is determined that the measured power ratio is 20 db or more (S850), the target identification algorithm is performed (S860) And detects the target signal.

9 is a block diagram of a target detection apparatus using dual polarization according to another embodiment of the present invention.

The target searching apparatus using the dual polarization target angle estimating apparatus of the present invention includes an antenna unit 100, a transmitter 120, a circulator 320, a first comparator 340, a second comparator 360, a receiver 380, a signal processing unit 500, a gimbal driving unit 620, and a gimbal 640.

The signal processing unit 500 includes a signal calculation unit 520, a signal comparison unit 540, a power ratio measurement unit 560, and a waveform generation unit 570. The signal calculation unit 520 includes a first reflection signal processing unit 524 and a second reflection signal processing unit 522.

The antenna unit 100 receives the reflected signal reflected from the target. Since the antenna unit 100 is as described above, it is omitted.

The transmitter 120 emits a radiation signal for detecting a target in consideration of information about a target signal detected by the signal processor 500. [ In the present invention, the radiation signal may have a frequency characteristic specific to a wideband millimeter wave.

The circulator 320 branches the transmission signal transmitted from the transmitter 120 and the reflection signal received from the antenna unit 100. In general, an antenna of a searcher mounted on a guided weapon can function as both transmission and reception for detecting a target, and can switch functions and prevent cross-talk of transmission and reception signals.

Referring to FIG. 2, the first comparator 340 and the second comparator 360 receive the polarized signals polarized in a specific direction from the polarized wave separator 320, and add the weights to the received polarized signals. The process of applying the weights and summation is the same as described above, and therefore will not be described. The first comparator 340 and the second comparator 360 may include a plurality of hybrid couplers, and the redundancy of the comparator is the same as described above.

The receiver 380 receives the polarized signals added from the first comparator 340 and the second comparator 360 and transmits the polarized signals to the signal processor 500.

The first reflection signal processor 524 calculates the magnitude of the first reflected signal using the polarized signal of the first group of the first comparator 340. As described above, the first group of polarized wave signals are horizontally polarized signals and the first reflected signals are arranged so that the number of times of reflection is an odd number of circuits.

The second reflection signal processing unit 522 calculates the magnitudes of the second reflected signals using the first and second groups of polarized signals of the first comparator 340 and the second comparator 360. As described above, the polarized signal of the first group is a horizontally polarized signal, the polarized signal of the second group is a vertically polarized signal, the reflection signal of which the number of times of reflection is an odd number of times, and the second reflection signal, And may be provided so as to be a formed reflection signal.

The signal comparator 540 compares the calculated difference between the magnitudes of the first and second reflected signals with previously stored reference values. The signal processor 500 can determine the received signal as a target signal when the magnitude of the difference between the first and second reflected signals is smaller than the reference value.

The power ratio measuring unit 560 measures the power ratio occupied by the target signal among the received signals. The redundancy of the power ratio measuring unit 560 is the same as described above, and thus will not be described.

The waveform generating unit 570 generates a signal for solving the Doppler phenomenon of the frequencies generated from the transmission signal and the received polarized signals. The gimbal driving unit 620 receives the gimbal control signal considering the information of the signal determined as the target signal in the signal processing unit 500 and drives the gimbal 540 using the received gimbal control signal. The gimbal 540 adjusts the direction of the antenna unit 100.

10 is an exemplary diagram illustrating a situation in which the target detection apparatus using dual polarization of the present invention tracks a ground target.

The target signal detection apparatus 10 using dual polarization can detect a target signal reflected from the target 2000 mounted on the guided weapon 1000. The target signal detecting apparatus 10 using dual polarization can classify the received signal into a first reflected signal and a second reflected signal according to the number of reflections by using dual polarization, Once the target 2000 is detected, a monopulse error angle can be calculated to continuously detect the target 2000. [

The target signal detecting apparatus 10 using the dual polarization can effectively detect the target clutter and the target signal by using the dual polarization instead of the single polarization.

All or part of the method of an embodiment of the invention described above can be implemented in the form of a computer-executable recording medium such as a program module executed by a computer. Here, the computer-readable medium can be any available medium which can be accessed by a computer, and includes both volatile and nonvolatile media, removable and non-removable media. The computer-readable medium may also include computer storage media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data.

All or part of the method according to an embodiment of the present invention may also be embodied in a computer program (or computer program product) recorded on a medium, including instructions executable by the computer. A computer program includes programmable machine instructions that are processed by a processor and can be implemented in a high-level programming language, an object-oriented programming language, an assembly language, or a machine language . The computer program may also be recorded on a computer readable recording medium of a type (e.g., memory, hard disk, magnetic / optical medium or solid-state drive).

Thus, a method according to an embodiment of the present invention may be implemented by a computer program as described above being executed by a computing device. The computing device may include a processor, a memory, a storage device, a high-speed interface connected to the memory and a high-speed expansion port, and a low-speed interface connected to the low-speed bus and the storage device. Each of these components is connected to each other using a variety of buses and can be mounted on a common motherboard or mounted in any other suitable manner.

It will be apparent to those skilled in the art that various modifications, changes, and substitutions are possible, without departing from the essential characteristics and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (13)

An antenna unit that emits a signal for detecting a target, and receives a received signal reflected by the emitted signal;
Separating the polarized signals into at least a first group of polarized signals and a second group of polarized signals in consideration of the polarization direction of the received signal and summing the polarized signals belonging to the group for each of the first group and the second group A comparator; And
Dividing the received signal into a first reflection signal and a second reflection signal according to the reflection number based on the summed polarized signals of the first group and the second group of polarized signals, Calculating magnitudes of the first reflection signal and the second reflection signal by using magnitude-squared components of the polarized signals of the second group, and comparing magnitudes of the calculated first and second reflection signals with a pre- A signal processor for determining whether the received signal is a target signal reflected from the target; Lt; / RTI >
The signal processing unit
A waveform generating unit for generating a waveform signal for solving a Doppler phenomenon of frequencies generated from the radiated signal and the polarized wave signals; Further comprising:
Wherein the antenna unit emits a signal for detecting the target using the generated waveform signal. The method according to claim 1,
Wherein the polarized directions of the separated groups are orthogonal to each other. The method according to claim 1,
Wherein the first reflection signal is a reflection signal in which the number of reflection times is an odd number of circuits and the second reflection signal is a reflection signal in which the number of reflection times is an even number of circuits. The antenna apparatus according to claim 1,
A circulator for branching the radiated signal and the received signal; Further comprising:
Wherein the target signal is branched with the emitted signal to receive the received signal. The apparatus of claim 1, wherein the comparator
A polarized wave separator separating the reflected signal into at least the first group of polarized signals and the second group of polarized signals in consideration of the polarization direction; Further comprising:
And polarized signals belonging to the group are added to the separated first group and the second group, respectively. 6. The apparatus of claim 5, wherein the comparator
A first comparator for summing the separated first group of polarized signals; And
A second comparator for summing the separated second group of polarized signals; Further comprising:
Wherein the polarized signals of the first group and the polarized signals of the second group are summed. delete The signal processing apparatus according to claim 1,
A power ratio measuring unit for measuring a power ratio of the target signal among the received signals; Further comprising:
And determines whether the received signal is a target signal reflected from the target in consideration of the measured power ratio. Emitting a signal for detecting a target and receiving a received signal from which the radiated signal is reflected;
Separating at least a first group of polarized signals into a second group of polarized signals in consideration of a polarization direction of the received signal;
Summing the polarized signals belonging to the group to the separated first group and the second group; And
Determining whether the received signal is a target signal reflected from the target using the summed polarized signals of the first group and the second group of polarized signals; Lt; / RTI >
The step of determining
Classifying the received signal into a first reflected signal and a second reflected signal according to the number of times of reflection;
Calculating a magnitude of the first reflected signal and a magnitude of the second reflected signal based on the magnitude component of the first group of polarized signals and the polarized signals of the second group, Calculating a magnitude difference of the second reflected signal; And
Comparing the calculated size difference with a pre-stored reference value; Further comprising:
Determines the received signal as the target signal when the calculated size difference is smaller than the reference value,
Wherein the signal for detecting the target is radiated using a waveform signal for solving the Doppler phenomenon of frequencies generated from the radiated signal and the polarized signals. delete 10. The method of claim 9,
Wherein the polarized directions of the separated groups are orthogonal to each other. 10. The method of claim 9,
Wherein the first reflection signal is a reflection signal in which the number of reflection times is an odd number of circuits and the second reflection signal is a reflection signal in which the number of reflection times is an even number of circuits. A program recorded on a computer-readable recording medium for realizing a target detection method using a dual polarized wave according to any one of claims 9 to 11 through being executed by a processor.

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