KR101846020B1 - Apparatus Selecting Polarized Wave for SCR Improvement in W-Band Millimeter Wave Seeker and Method thereof - Google Patents

Abstract

The present invention relates to an apparatus to select a polarized wave and a method thereof. More specifically, the present invention relates to an apparatus to select a polarized wave, which varies the polarized wave angle in consideration of power of a receiving clutter within a polarized wave scope adjacent to a pre-saved polarized wave angle and distinguishes a target from a clutter signal. According to the present invention, the apparatus to select a polarized wave comprises: a first clutter processing unit to radiate a first polarized wave signal of a first polarized wave angle to detect a target at a pre-saved radiation angle and to perform a Fourier transform of a first reception signal, which is received as the radiated first polarized wave signal is reflected, thereby calculating the size of the first clutter signal reflected in a clutter; a second clutter processing unit to radiate second polarized wave signals at a polarized wave angle adjacent to a pre-saved second polarized wave angle in accordance with the radiation angle and to perform a Fourier transform of second reception signals received as the radiated second polarized wave signals are reflected, thereby calculating the size of second clutter signals reflected in the clutter; and a polarized wave selection unit to compare the calculated sizes of the first clutter signal and second clutter signals and to select a polarized wave direction of a target signal to detect the target.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an apparatus and method for selecting a polarization for SCR improvement in a W-band millimeter wave searcher,

The present invention relates to an apparatus and method for selecting a polarized signal. More particularly, the present invention relates to an apparatus for selecting polarization in a searcher using different polarizations.

Conventional terrestrial target tracking detectors are mounted on a guided weapon and detect the target using transmission frequencies in the ku (12-18Ghz) and ka (26-40Ghz) bands. 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.

In general, the target location search method of the target tracking searcher can be largely a cone search method and a monopulse search method. Currently, the radar searcher mainly uses the monopulse search method. A target seeker using a monopulse search technique can transmit polarizations in various directions at the time of tracking the target and change the transmission polarization to differentiate the backscattered reception power level for the same target and clutter .

In the case of the conventional microwave searcher, the PRF and the frequency were controlled by separating the target signal and the clutter signal by predicting the clutter position in real time in the frequency and distance region using the pulse doppler type. In the radar system, STAP (Space Time Adaptive Processing) The conventional searcher can not change the polarized wave when transmitting the radar signal. Therefore, when the clutter component and the target signal come in at the same time, it is impossible to selectively lower the clutter signal power .

Also, in the case of the technology used in the conventional microwave searcher, it is impossible to predict the clutter component and control the PRF when the CW (Continuous Wave) waveform is operated, and the STAP signal processing technique of the existing radar system, There is a limit that can not be implemented in real time.

Therefore, it is required to develop a technique that can differentiate the target and clutter signals by varying the polarization.

Korean Patent No. 10-1750500 (Bulletin)

SUMMARY OF THE INVENTION The present invention is conceived to solve the problems described above, and discloses a polarization selection apparatus. Disclosed is an apparatus and method for setting a polarization direction and selecting a polarization direction according to a polarization angle having a small magnitude of a clutter signal in the polarization direction.

SUMMARY OF THE INVENTION The present invention has been conceived to achieve the above-described object, and a polarization selection device of the present invention radiates a first polarization signal of a first polarization angle to detect a target at a predetermined radiation angle, A first clutter processing unit for Fourier transforming the first received signal reflected by the signal and calculating the magnitude of the first clutter signal reflected from the clutter; The second polarized wave signal having a polarized angle adjacent to the pre-stored second polarized angle according to the radiation angle, the second polarized wave signals reflected by the emitted second polarized wave signals are subjected to Fourier transform to Fourier transform the received second received signals, A second clutter processing unit for calculating the magnitude of the second clutter signals; And a polarization selection unit for comparing a magnitude of the calculated first clutter signal and the second clutter signals to select a polarization direction of a detection signal for detecting the target; .

In the present invention, the first polarized signal, the second polarized signals, and the detection signal may be pulse-type signals and may be provided as millimeter waveband signals.

The first clutter processor may include a first Doppler generator for Fourier-transforming the first received signal to generate a first Doppler signal; And the size of the first clutter signal can be calculated using the generated first Doppler signal.

In the present invention, the first clutter processing unit may distinguish the first clutter signal reflected from the target from the signal reflected from the target in the generated first Doppler signal to detect the first clutter signal, A clutter signal detector; And the magnitude of the detected first clutter signal can be calculated.

In the present invention, the second clutter processing unit may include: a polarization range searching unit that sets a polarization range of a polarization angle adjacent to the second polarization angle; And may emit second polarized signals having at least one different polarization angles within the set polarization range.

The second clutter processing unit may include a second Doppler generator for Fourier-transforming the second received signals to generate second Doppler signals; A second clutter signal detector for detecting the second clutter signals by distinguishing second clutter signals reflected from the clutter and signals reflected from the target in the second Doppler signals; And may calculate the magnitude of the detected second clutter signals.

In the present invention, the polarization selection unit may include a polarization comparison unit for comparing magnitudes of the calculated first clutter signal and second clutter signals; And a polarization direction of the detection signal can be selected using a polarization angle of a small-sized clutter signal among the first and second clutter signals.

The second polarization signals are radiated in the same direction as the radiation angle at which the first polarization signal is radiated, and the second polarization angle is set such that the size of the received clutter signal in accordance with the radiation angle and the second polarization angle is Can be stored in advance.

 According to another aspect of the present invention, there is provided a polarization selection method including: emitting a first polarization signal of a first polarization angle at a predetermined radiation angle to detect a target; Calculating a magnitude of a first clutter signal reflected from the clutter by Fourier transforming the first received signal; The second polarized wave signal having a polarized angle adjacent to the pre-stored second polarized angle according to the radiation angle, the second polarized wave signals reflected by the emitted second polarized wave signals are subjected to Fourier transform to Fourier transform the received second received signals, Calculating the magnitude of the second clutter signals; And selecting a polarization direction of a detection signal for detecting the target by comparing magnitudes of the calculated first clutter signal and the second clutter signals; .

In the present invention, the step of calculating the magnitudes of the second clutter signals may include: setting a polarization range of a polarization angle adjacent to the second polarization angle; And may emit second polarized signals having at least one different polarization angles within the set polarization range.

The calculating of the magnitudes of the second clutter signals may include Fourier transforming the second received signals to generate second Doppler signals; And detecting the second clutter signals by distinguishing second clutter signals reflected from the clutter from signals reflected from the target in the second Doppler signals generated; And may calculate the magnitude of the detected second clutter signals.

The second polarization signals are radiated in the same direction as the radiation angle at which the first polarization signal is radiated, and the second polarization angle is set such that the size of the received clutter signal in accordance with the radiation angle and the second polarization angle is And the first polarized wave signal, the second polarized wave signals, and the detection signal are pulse type signals, and may be provided as a millimeter wave band signal.

Further, the present invention discloses a computer program stored in a computer-readable recording medium for causing a computer to execute the above-described polarization selection method.

According to the present invention, the clutter and the target signal can be easily distinguished by using different transmission polarizations.

In particular, it is possible to selectively reduce the clutter signal power by varying the polarization in real time.

1 is a block diagram of a polarization selection apparatus according to an embodiment of the present invention.
2 is an enlarged block diagram of the first clutter processing unit in the embodiment of FIG.
3 is an exemplary diagram showing the magnitude of a target and clutter signal that are differentiated according to the polarization direction.
4 is an enlarged block diagram of the second clutter processing unit in the embodiment of FIG.
5 is an exemplary diagram showing the magnitude of the reception clutter signal according to the polarization angle in the polarization range adjacent to the second polarization angle.
6 is an enlarged block diagram of a polarization selection unit in the embodiment of FIG.
7 is a flowchart of a polarization selection method of the present invention.
8 is an enlarged flow chart of the step of calculating the magnitude of the second clutter signals in the embodiment of FIG.
9 is a flowchart of a target detection method in a W-band millimeter wave searcher using the polarization selection method of the present invention.

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.

Hereinafter, the configuration of the polarization selection device 10 according to an embodiment of the present invention will be described in detail with reference to related drawings.

1 is a block diagram of a polarization selection apparatus 10 according to an embodiment of the present invention. Will be described with reference to FIG.

The polarization selection apparatus 10 of the present invention includes a first clutter processing unit 100, a second clutter processing unit 200 and a polarization selection unit 300. For example, the polarization selection device 10 may be provided within the W-band millimeter wave searcher, and the polarization selection device 10 may change the polarization when the clutter component and the component reflected from the target are received at the same time, Can cause a difference in received power levels for the clutter. In the conventional searcher, the PRF and the transmission and reception frequencies are controlled so that the target signal and the clutter signal are separated by predicting the clutter position in real time in the frequency and distance domain using the pulse Doppler type. In the radar system, STAP (Space Time Adaptive Processing) The amount of computation was large because the clutter component was suppressed and the target detection was performed.

For example, the polarization selection device 10 may use a second polarization angle stored differently depending on the depth of the antenna (depression angle) and the magnitude of the clutter signal in the W-band millimeter wave searcher, The polarization direction according to the polarization angle that causes the clutter signal to be received small is selected. Therefore, the polarization selection device 10 can improve the signal to clutter ratio (SCR) by raising the target signal and lowering the clutter signal. The W-band millimeter wave searcher in which the polarization selection device 10 is used can search for a target by radiating a detection signal in a polarization direction selected by the polarization selection device 10, The polarized signal, the second polarized signals, and the detection signal are pulse-type signals and include a millimeter waveband signal. In the present invention, the millimeter wave band signal may be provided with a signal having a wavelength of 1 to 10 mm or a signal having a frequency band of 50 to 300 GHz.

The first clutter processing unit 100 includes a first Doppler generator 120, a first clutter signal detector 140, and a first antenna unit. The first clutter processing unit 100 radiates a first polarization signal of a first polarization angle for detecting a target at a predetermined radiation angle and outputs the first received signal reflected by the radiated first polarization signal to a Fourier transform And calculates the magnitude of the first clutter signal reflected from the clutter. For example, the first clutter processing unit 100 emits an initial polarized signal for detecting a target as a first polarized signal of a first polarization angle, and the first polarized angle is a pre-simulated flight test (CFT) And may be previously stored differently according to the radiation angle at which the first polarization signal and the second polarization signal are radiated from the antenna unit. In the present invention, the radiation angle includes the incidence angle and the angle at which the antenna looks down the target (Depression Angle).

The first Doppler generator 120 performs a Fourier transform on the first received signal to generate a first Doppler signal. For example, the first Doppler generator 120 may represent a first received signal as a frequency and a power of a received signal, and may express the first received signal as a Doppler spectrum. In the present invention, the first Doppler generator 120 uses a Fourier transform to perform Fourier transform on a received signal and to indicate a magnitude value in the frequency domain. In the present invention, the Fourier transform is a discrete Fourier transform, . In the present invention, the Fourier transform algorithm includes a Rader-Brenner algorithm, which is similar to the Cooley-Turkey Algorithm (Cooley-Turkey Algorithms) and the Coulomb's algorithm, It can include the Winograd algorithm and the QFT algorithm with recursive factorization, Bruun's algorithm that uses the transformed real coefficient polynomial, coefficients of 1, 0, or -1, little multiplication is required and minimal multiplication FFT can be obtained. have. Will be described with reference to FIG.

The first clutter signal detector 140 detects the first clutter signal by distinguishing the first clutter signal reflected from the clutter from the signal reflected from the target in the generated first Doppler signal. For example, the first clutter signal detecting unit 140 may detect the first clutter signal by distinguishing the target and clutter signals according to the frequency of the first polarization signal, the radiated position, the polarization direction, and the magnitude of the received signal . The first clutter signal detector 140 uses the frequency of the first polarization signal, the first polarization angle of the first polarization signal, and the magnitude component of the clutter signal to distinguish the target signal from the clutter signal, A signal can be detected.

For example, when the first polarized signal is V-pol, the first clutter signal detector 140 detects the first polarized signal by considering the frequency and magnitude of the first received signal reflected by the first polarized signal, The first clutter signal 122 and the clutter signal 124 can be distinguished, and the magnitude of the first clutter signal can be calculated. Also, the first clutter signal detector 140 detects the target signal 126 in consideration of the frequency and magnitude of the first received signal reflected by the first polarized signal when the first polarized signal is horizontal (H-pol) And the clutter signal 128, and to calculate the magnitude of the first clutter signal.

In the present invention, the first antenna unit includes a waveguide slot array antenna or a reflector antenna, and includes a main reflector, a sub reflector, and a feed horn. The target antenna estimates a target angle for accurately tracking a target using a monopulse technique. In the present invention, the first antenna section may emit or receive polarized waves oscillating in a specific transverse direction, and the polarized waves include linear, linear, elliptical and circular polarized waves. The first antenna unit may include a horn antenna, a dipole antenna, a monopole antenna, and a patch antenna. The first antenna unit may be disposed at upper, lower, left, and right sides of a W-band millimeter wave searcher in which the polarization selection device 10 is used. The first antenna unit 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 first antenna section emits a first polarization signal of a first polarization angle and receives a first reception signal.

The second clutter processing unit 200 includes a polarization range searching unit 220, a second Doppler generating unit 240, a second clutter signal detecting unit 260, and a second antenna unit. For example, the second clutter processing unit 200 may perform a pre-simulated flight test (CFT) on the basis of the stored angle of the antenna (depression angle) and the magnitude of the clutter signal, The magnitude of the second clutter signals can be calculated using the polarization angle. The second polarization angle used by the second clutter processing unit 200 of the present invention is a polarization angle stored differently according to a radiation angle (depression angle) at which the first polarization signal is radiated in the first clutter processing unit, Is the polarization angle indicating the size of the lowest clutter signal among the polarization signals corresponding to the radiation angle in the flight test.

However, the polarization angle at which the W-band millimeter wave searcher including the polarization selecting device 10 exhibits the lowest clutter signal magnitude during actual flight may be different from the second polarization angle stored in the pre-simulated flight test. Therefore, the second clutter processing unit 200 sets the polarization range adjacent to the previously stored second polarization angle, rapidly radiates the second polarization signals according to the polarization angle within the corresponding polarization range, The polarization selection unit 300 may be provided to compare magnitudes of the first clutter signal and the second clutter signals by calculating the magnitudes of the second clutter signals in the received signals reflected. Will be described with reference to FIG.

The polarization range search unit 220 sets a polarization range 226 of the polarization angle adjacent to the second polarization angle 222 and searches for polarization angles arranged at preset intervals within the set polarization range. For example, the polarization range search unit 220 can set the polarization range 226 adjacent to the second polarization angle 222 that is differently set according to the radiation angle and the first polarization angle at which the first polarization signal is emitted , The second clutter processing unit (200) emits second polarized signals according to the polarization angle within the set polarization range, and transmits the second clutter signal from the second received signals reflected by the emitted second polarized signals, . Although the polarization range set by the polarization range search unit 220 is not limited, it may be provided in a range of 10 degrees adjacent to the second polarization angle 222, and the interval of polarization angles within the polarization range 226 is 1 Roads can be arranged.

The second Doppler generator 240 generates second Doppler signals by Fourier transforming the second received signals reflected by the second polarized signals. The second Doppler signals generated by the second Doppler generator 240 may be expressed by frequency and signal power, which may be provided in a Doppler spectrum. The Fourier transform algorithm used by the second Doppler generator 240 to generate the second Doppler signals may be the same as the Fourier transform algorithm used by the first Doppler generator 120. [

The second clutter signal detector 260 detects the second clutter signals by distinguishing the signals reflected from the target from the generated second Doppler signals and the second clutter signals reflected from the clutter . For example, the second clutter signal detector 260 detects the second clutter signal by distinguishing a signal reflected from the target from a second Doppler signal and a second clutter signal reflected from the clutter. For example, the second clutter signal detector 260 detects the second clutter signal by distinguishing the target and clutter signals according to the frequency of the second polarization signal, the radiated position, the polarization direction, and the magnitude of the received signal . The second clutter signal detecting unit 260 uses the frequency of the second polarization signal, the second polarization angle of the second polarization signal, and the magnitude component of the clutter signal to distinguish the target signal from the clutter signal, A signal can be detected.

The second antenna portion is provided in the same configuration as the first antenna portion and can radiate or receive a polarized wave vibrating in a specific transverse direction, and the polarized wave includes linear, linear, elliptical and circular polarized waves. For example, the second antenna portion emits second polarized waves of the second polarization angle and receives the second received signals.

According to one embodiment of the second clutter processing unit 200 of the present invention, when the second polarization angle 222 referred to according to the radiation angle of the first polarization signal and the first polarization angle is 30 degrees, The polarization range searching unit 220 in the processing unit 200 sets the polarization range 226 to 25 to 35 degrees and the second clutter processing unit 200 sets the polarization range 226 to 25 to 35 degrees, Emits the second polarized signals according to the angles, and calculates the magnitudes of the second clutter signals from the second received signals emitted from the second polarized signals. In the present invention, the second polarization signals may be radiated at an emission angle equal to the emission angle at which the first polarization signal is emitted, and the second polarization angle may be the emission angle of the received clutter signal It can be stored in advance in consideration of the size of the data. Will be described with reference to FIG.

The polarization selection unit 300 includes a polarization comparison unit 320 and a polarization control unit 340. For example, the polarization selection unit 300 compares the magnitudes of the first clutter signal and the second clutter signals calculated in the first and second clutter processing units 100 and 200 to determine the target Select the polarization direction of the detection signal to detect. For example, the polarization controller 300 compares the magnitudes of the second clutter signals calculated using the first polarization signal, which is the initial polarization signal, and the second polarization angle, which is stored in advance, The polarization direction is selected by using the polarization angle of the signal in which the signal size is small.

For example, when the first polarization angle is 25 degrees and the second polarization angle is 28 degrees, the polarization selection unit 300 determines the polarization angle within the polarization range of 23 degrees to 33 degrees set by the polarization range search unit 220 And a first polarization signal having a polarization angle of 25 degrees is reflected, and a first polarization signal having a polarization angle of < RTI ID = 0.0 > 25 < / RTI & The polarization direction of the clutter signal with the smallest clutter signal size is selected as the polarization direction by comparing the clutter signal size.

The polarization comparator 320 compares the magnitudes of the first clutter signal and the second clutter signal. For example, the polarization comparator 320 compares the magnitudes of the first clutter signal and the second clutter signal, and supplies the polarization selection unit 300 to the polarization direction determination unit 300 using the polarization angle of the smallest clutter signal, Can be selected. The polarization control unit 340 controls the polarization direction of the detection signal using the polarization angle of the small-sized clutter signal among the first and second clutter signals, Can select the polarization direction using the polarization angle of the detection signal in which the polarization direction is controlled.

2 is an enlarged block diagram of the first clutter processing unit 100 in the embodiment of FIG.

The first clutter processing unit 100 includes a first clutter signal detecting unit 140 and a first antenna unit. For example, the first clutter processing unit 100 emits a first polarized signal of a first polarization angle as an initial polarized signal, and a second clipped signal of the first polarized wave from the first received signal, And the size of the signal is calculated. In the present invention, the first clutter processing unit 100 includes the first antenna unit and emits the first polarization signal or receives the first reception signal as described above.

The first Doppler generator 120 performs a Fourier transform on the first received signal to generate a first Doppler signal in the frequency domain. Since the first Doppler signal is as described above, it is omitted. The first clutter signal detector 140 detects the first clutter signal by distinguishing the signal reflected from the target from the first Doppler signal and the first clutter signal reflected from the clutter. A specific method for the first clutter signal detecting unit 140 to detect the first clutter signal from the first Doppler signal is the same as described above, and thus will not be described.

3 is an exemplary diagram showing the magnitude of a target and clutter signal that are differentiated according to the polarization direction.

The first clutter signal detector 140 and the second clutter signal detector 260 of the present invention detect the magnitude of the first clutter signal and the second clutter signals. For example, when the first polarization angle is perpendicular to the ground, the first clutter signal detector 140 reflects the radiated vertical polarization signal, and uses the frequency and the received power of the signal from the received signal to generate the target signal 122 And the clutter signal 124 can be distinguished and detected. In another embodiment, when the transmission polarized wave is horizontally polarized wave, the radiated horizontal polarized wave signal is reflected, and the target signal 126 and the clutter signal 128 are distinguished from the received signal using the received power of the frequency and the signal, A signal can be detected.

4 is an enlarged block diagram of the second clutter processing unit 200 in the embodiment of FIG.

The second clutter processing unit 200 includes a polarization range searching unit 220, a second Doppler generating unit 240, a second clutter signal detecting unit 260, and a second antenna unit. A specific method of calculating the size of the second clutter signals using the second polarization angle stored differently according to the incidence angle of the antenna and the magnitude of the clutter signal stored in advance by the second clutter processing unit 200 is as described above It is omitted.

The polarization range search unit 220 sets the polarization range 226 of the polarization angle adjacent to the second polarization angle 222 and sets the specific polarization range as described above. The second Doppler generator 240 generates a second Doppler signals by Fourier transforming the second received signals reflected from the second polarized signals and generates a second Doppler signals. It is omitted as it is the same.

The second clutter signal detector 260 detects the second clutter signals by distinguishing the signals reflected from the target from the generated second Doppler signals and the second clutter signals reflected from the clutter . The specific method by which the second clutter signal detector 260 detects the second clutter signal is as described above.

5 is an exemplary diagram showing the magnitude of the reception clutter signal according to the polarization angle in the polarization range adjacent to the second polarization angle.

The second polarization angle used by the polarization selection device 10 is different according to the radiation angle and the polarization angle of the polarization signals radiated from the antenna and when the polarization signal having the second polarization angle is reflected and received in the pre- And a polarization angle 222 representing the magnitude of the lowest clutter signal. However, since the polarization selection device 10 may differ from the polarization angle 224 obtained by actually obtaining the magnitude of the lowest clutter signal through the CFT, the polarization in the polarization range 226 adjacent to the second polarization angle The polarized wave signals according to the angles are radiated, and the magnitudes of the received signals reflected by the radiated polarized wave signals are calculated, and the polarized angle 224 of the received signal having the magnitude of the lowest clutter signal is used to calculate the polarization Direction can be selected.

FIG. 6 is an enlarged block diagram of the polarization selection unit 300 in the embodiment of FIG.

The polarization selection unit 300 includes a polarization comparison unit 320 and a polarization control unit 340. For example, the polarization selection unit 300 compares the magnitudes of the first clutter signal and the second clutter signals calculated in the first and second clutter processing units 100 and 200 to determine the target Select the polarization direction of the detection signal to detect. The specific method of selecting the polarization direction by the polarization selective section 300 is the same as described above, and thus will not be described.

7 is a flowchart of a polarization selection method of the present invention.

The polarization selection method includes the following steps, which are performed in a time-series manner in the polarization selection device 10. [

In S100, the first clutter processing unit 100 emits a first polarized signal of a first polarization angle for detecting a target at a predetermined radiation angle, and outputs the first received signal reflected by the emitted first polarized signal The signal is Fourier transformed to calculate the magnitude of the first clutter signal reflected from the clutter. A specific method for the first clutter processing unit 100 to generate the first Doppler signal and distinguish it from the target signal to detect the first clutter signal is the same as described above, and thus will not be described.

In step S200, the second clutter processing unit 200 determines whether the second polarized wave stored differently according to the depression angle (the angle overlooking the target) and the magnitude of the clutter signal, stored in advance through the pre-simulated flight test (CFT) The magnitude of the second clutter signals can be calculated using the angle. The specific method by which the second clutter processing unit 200 detects the second clutter signal is the same as described above and will not be described.

In S300, the polarization selection unit 300 compares the magnitudes of the first clutter signal and the second clutter signals calculated in the first and second clutter processing units 100 and 200 to determine the target Select the polarization direction of the detection signal to detect. For example, the polarization selection unit 300 compares the magnitude of the first clutter signal and the second clutter signal, and determines the polarization angle of the smallest clutter signal as the polarization angle of the detection signal, Direction can be selected.

Figure 8 is an enlarged flow chart of the step of calculating the magnitude of the second clutter signals in the embodiment of Figure 1;

In S220, the polarization range searching unit 220 sets the polarization range 226 of the polarization angle adjacent to the second polarization angle 222. [ The polarization range set by the polarization range searching unit 220 and the interval between the polarization angles are the same as described above and will not be described. In S240, the second Doppler generator 240 generates second Doppler signals by Fourier-transforming the second received signals reflected by the second polarized signals. A specific method for generating the second Doppler signals by the second Doppler generator 240 is the same as described above and will not be described here.

In S260, the second clutter signal detector 260 distinguishes the signals reflected from the target from the generated second Doppler signals and the second clutter signals reflected from the clutter, . The specific method by which the second clutter signal detecting unit 260 detects the second clutter signals is the same as described above and is therefore omitted.

9 is a flowchart of a target detection method in a W-band millimeter wave searcher using the polarization selection method of the present invention.

In step S502, operation of the W-band millimeter wave searcher including the polarization selection device 10 is started. In step S504, the first clutter processing unit 100 transmits the initial specific polarized wave. In step S506, the first clutter processing unit 100 receives the reflected signal from which the initial specific polarized wave is reflected and received. In step S508, the first clutter processing unit 100 performs a Fourier transform on the received reflection signal to generate a Doppler spectrum.

In S510, the first clutter processing unit 100 distinguishes the target signal and the clutter signal from the generated Doppler spectrum. In S512, the polarization selection device 10 can store the clutter power and the polarization angle required for the database prepared in advance.

For example, the polarization selection device 10 may compare the magnitudes of the first and second clutter signals in the polarization selector 300 to store the polarization angle of the signal having the smallest clutter signal magnitude, The polarization direction of the detection signal can be selected using the polarization angle. In S514, the polarization selection device 10 can change the polarization direction of the antenna section by using the polarization direction of the detection signal selected by the polarization selection section 300. [

In S516, the polarization selection device 10 can check whether the size of the clutter signal is reduced by comparing the magnitudes of the clutter signals according to the polarized signals in the variable polarization direction.

In step S518, the polarization selection device 10 selects the polarization direction in real time, emits the polarized wave signals in the selected polarization direction, and detects the clutter signal of the received signals reflected by the radiated polarized wave signals And when the clutter signal corresponding to the polarization signals whose polarization directions are varied is decreased, the target is detected using the corresponding polarized signals. In S520, the W band millimeter wave searcher in which the polarization selection device 10 is used tracks the detected target.

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, substitutions and substitutions are possible, without departing from the scope 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)

A first polarization signal of a first polarization angle for detecting a target is radiated at a predetermined radiation angle and the first received signal reflected by the radiated first polarization signal is subjected to Fourier transform to obtain a first A first clutter processing unit for calculating the magnitude of the clutter signal;
The second polarized wave signal having a polarized angle adjacent to the pre-stored second polarized angle according to the radiation angle, the second polarized wave signals reflected by the emitted second polarized wave signals are subjected to Fourier transform to Fourier transform the received second received signals, A second clutter processing unit for calculating the magnitude of the second clutter signals; And
A polarization selector for comparing a magnitude of the calculated first clutter signal and the second clutter signals to select a polarization direction of a detection signal for detecting the target; And a polarizer. The method according to claim 1,
Wherein the first polarized wave signal, the second polarized wave signal, and the detection signal are pulse-type signals and are millimeter wave band signals. The apparatus according to claim 1, wherein the first clutter processing unit
A first Doppler generator for Fourier-transforming the first received signal to generate a first Doppler signal; Further comprising:
And calculates the magnitude of the first clutter signal using the generated first Doppler signal. The apparatus according to claim 3, wherein the first clutter processing unit
A first clutter signal detector for detecting the first clutter signal by distinguishing a signal reflected from the target from the generated first Doppler signal and a first clutter signal reflected from the clutter; Further comprising:
And calculates the magnitude of the detected first clutter signal. The apparatus according to claim 1, wherein the second clutter processing unit
A polarization range search unit for setting a polarization range of a polarization angle adjacent to the second polarization angle and searching for polarization angles arranged at preset intervals within the set polarization range; Further comprising:
And radiates second polarized signals having the detected polarization angles. 6. The apparatus according to claim 5, wherein the second clutter processing unit
A second Doppler generator for Fourier-transforming the second received signals to generate second Doppler signals; And
A second clutter signal detector for detecting the second clutter signals by distinguishing the signals reflected from the target from the generated second Doppler signals and the second clutter signals reflected from the clutter; Further comprising:
And calculates the magnitude of the detected second clutter signals. The apparatus of claim 1, wherein the polarization selection unit
A polarization comparator for comparing magnitudes of the first and second clutter signals calculated; And
A polarization controller for controlling a polarization direction of the detection signal by using a polarization angle of a small-sized clutter signal among the first and second clutter signals; Further comprising:
Wherein the polarization direction is selected by using a polarization angle of the detection signal in which the polarization direction is controlled. The method according to claim 6,
Wherein the second polarized signals are radiated at the same radial angle at which the first polarized signal is radiated,
Wherein the second polarization angle is previously stored in consideration of the magnitude of the received clutter signal according to the radiation angle and the second polarization angle. A first polarization signal of a first polarization angle for detecting a target is radiated at a predetermined radiation angle and the first received signal reflected by the radiated first polarization signal is subjected to Fourier transform to obtain a first Calculating a magnitude of the clutter signal;
The second polarized wave signal having a polarized angle adjacent to the pre-stored second polarized angle according to the radiation angle, the second polarized wave signals reflected by the emitted second polarized wave signals are subjected to Fourier transform to Fourier transform the received second received signals, Calculating the magnitude of the second clutter signals; And
Comparing a magnitude of the calculated first clutter signal and the second clutter signal to select a polarization direction of a detection signal for detecting the target; / RTI > 10. The method of claim 9, wherein calculating the magnitude of the second clutter signals comprises:
Setting a polarization range of a polarization angle adjacent to the second polarization angle and searching for polarization angles arranged at preset intervals within the set polarization range; Further comprising:
And the second polarization signals having the searched polarization angles are emitted. 11. The method of claim 10, wherein calculating the magnitude of the second clutter signals comprises:
Generating second Doppler signals by Fourier transforming the second received signals; And
Detecting the second clutter signals by distinguishing between signals reflected from the target and second clutter signals reflected from the clutter in the generated second Doppler signals; Further comprising:
And calculating the magnitudes of the detected second clutter signals. 10. The method of claim 9,
Wherein the second polarized signals are radiated at the same radial angle at which the first polarized signal is radiated,
The second polarization angle is previously stored in consideration of the magnitude of the received clutter signal according to the radiation angle and the second polarization angle,
Wherein the first polarized wave signal, the second polarized wave signal, and the detection signal are pulse-type signals and are millimeter wave band signals. A program recorded on a computer-readable recording medium for realizing the polarization selection method according to any one of claims 9 to 12 through being executed by a processor.

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