KR102080331B1 - Apparatus for measuring and imging radar cross section and system having the same - Google Patents

Abstract

The present invention is a reflection cross-sectional area measurement and imaging system, comprising: a transmission signal source for outputting a signal; A receiver output from the transmission signal source and receiving a signal reflected from the measurement object; A detector that converts power received from the receiver into a voltage; The signal output from the transmission signal source is attenuated so that the receiver does not become saturated according to the voltage checked through the detector, and the electromagnetic wave reflection cross-sectional area for the measurement object is determined according to the output of the signal output from the transmission signal source. And a computer that calculates an electromagnetic wave reflection cross-sectional area value for the measurement object and extracts an electromagnetic wave reflection cross-sectional image.

Description

Electromagnetic wave reflection cross-sectional area measurement and imaging device and system equipped with it {APPARATUS FOR MEASURING AND IMGING RADAR CROSS SECTION AND SYSTEM HAVING THE SAME}

The present invention relates to an electromagnetic wave reflection cross-sectional area measurement and imaging technology, and more specifically, to measure the electromagnetic wave reflection cross-sectional area of a reduced measurement object using a W-band millimeter wave signal source illuminated radiometer and measure 2D Or it relates to an electromagnetic wave reflection cross-sectional area measurement and imaging device for 3D imaging and an electromagnetic wave reflection cross-sectional area measurement and imaging system having the same.

The electromagnetic wave cross-sectional area (RCS: Radar Cross Section) refers to the reflected cross-sectional area of radar signals reflected from aircraft, ships, and vehicles, and the smaller the RCS area, the less likely it is to be detected from the radar. Therefore, in order to avoid detection by the radar, the shape of the structure must be designed so that the RCS is small. In particular, a technology having a stealth function is used as a very important technology in the military.

In general, RCS measurement is measured using an instrument such as a radar or a vector network analyzer (VNA) in an electromagnetic-reflection chamber test room using a real-size or reduced model, and the object to be measured is rotated 360 degrees and reflected from the object according to the angle. The RCS reflection area is expressed in dBsm with respect to the signal strength. However, these existing methods require a large measurement facility and expensive measurement equipment, and there is a problem that a lot of measurement time and cost occur.

An object of the present invention is to measure the RCS of a reduced measurement object using a signal output from a transmission signal source in a small space and reflected from the reduced measurement object, and to minimize the RCS of the measurement object based on the RCS measurement value and the 3D image. It is to provide a method and apparatus for measuring and imaging an electromagnetic wave reflection cross-section and a system having the same, which can be utilized in technology development.

Another object of the present invention is to provide an electromagnetic wave reflection cross-sectional area measurement and imaging device for measuring the RCS of a reduced measurement object using a signal source illuminated millimeter-wave radiometer, and a system having the same. have.

A first aspect of the present invention for achieving the above object is, a lens antenna that is output from a transmission signal source and passes while collecting the signal reflected from the measurement object; A reflector reflecting a signal from the lens antenna; A receiving antenna and a receiver collecting signals reflected from the reflector; A detector and a DC amplifier for detecting the received signal amplified by the receiver; A video camera that shoots an image of the measurement object; And a receiver driver that enables a scan operation to receive a reflected wave while the receiver moves in the XY plane, and information of the receiver and the video camera can be provided to a computer for electromagnetic wave cross-sectional area and imaging It provides an electromagnetic wave reflection cross-sectional area measurement and imaging device configured.

According to an embodiment of the present invention, the scanner includes a base, and the lens antenna is installed on an upper portion of the base, a lens supporting the lens antenna to enable height adjustment with respect to the base and distance adjustment with a measurement object Includes antenna supports.

According to an embodiment of the present invention, the lens antenna support, a mount that is installed to enable the front and rear direction movement on the slide installed on the base; Guide rods extending in the height direction from both sides of the cradle; Both ends are supported on the guide bar, and upper and lower supports supporting the upper and lower parts of the lens antenna; And a holder supporting the upper end of the guide rod.

According to an embodiment of the present invention, the video camera is installed on the upper support.

According to an embodiment of the present invention, the reflector is installed on the base to the rear side of the lens antenna, and includes a reflector support to support the height and angle adjustment of the reflector.

According to an embodiment of the present invention, the receiver driving part of the scanner includes a step motor that supports the receiver on the upper part and drives it in the X-Y direction.

According to an embodiment of the present invention, it further comprises a Z-axis direction transfer unit for moving the receiver in the Z direction.

According to an embodiment of the present invention, the scanner includes a base and a receiver driving unit installed on the base and transferring the receiver in an XY direction while supporting the receiver on the upper side, wherein the base includes: A lens antenna support is provided to support the lens antenna so that the height of the base and the distance to the measurement object can be adjusted. A reflector support is installed to support the height and angle adjustment of the reflector to the rear side of the lens antenna support. The carrier is provided on the lower surface of the base to enable movement and horizontal adjustment of the base.

According to an embodiment of the present invention, the receiving antenna includes a horizontally polarized antenna and a vertically polarized antenna, or a circularly polarized antenna.

A second aspect of the present invention includes a transmission signal source installed on the side surface of the electromagnetic wave reflection cross-sectional area measurement and imaging device and the electromagnetic wave reflection cross-sectional area measurement and imaging device; And a support device installed on the front side of the electromagnetic wave cross-sectional area measurement and imaging device, the support device including a support body on which an object to be measured is supported, and a rotating plate that rotates the support body to adjust an angle of the measurement object. Measurement and imaging system.

A method for measuring and imaging an electromagnetic wave reflection area, comprising: (a) measuring a first electromagnetic wave reflection area for a measurement object by outputting a signal from a transmission signal source; (b) when the receiver receives a signal reflected from the measurement object, checking the voltage of the received signal to attenuate the output of the signal output from the transmission signal source so that the receiver does not become saturated; (c) outputting an attenuated signal from the transmission signal source to measure a second electromagnetic wave reflection cross-sectional area for the measurement object; And (d) calculating a final electromagnetic wave reflection area value for the measurement object based on the first and second electromagnetic wave reflection cross-sectional areas.

Preferably, the signal output from the transmission signal source is a W-band millimeter wave continuous wave (CW) contentious wave signal, a frequency modulated CW (FMCW) signal, a linear frequency modulation (LFM) signal, It may be a pulse signal, a pulse modulation signal, or a noise signal.

Preferably, after the step (c), when the receiver receives the attenuated signal reflected from the measurement object, the voltage of the received attenuated signal is checked so that the receiver does not become saturated, the transmission signal source Re-attenuating the output of the signal output from the; And outputting the re-attenuated signal to measure a third electromagnetic wave reflection cross-sectional area for the measurement object.

Preferably, the step (d) may include calculating a final electromagnetic wave reflection cross-sectional area value for the measurement object based on the first to third electromagnetic wave reflection cross-sectional areas.

Preferably, the dynamic range of the receiver may be expanded to 30 dB or more through attenuation and re-attenuation of the signal.

Preferably, the step (d) may include converting measurement data for the first and second electromagnetic wave reflection cross-sections into conversion data, and extracting conversion coefficients; And converting the converted data into decibel data and calculating a logarithmic conversion coefficient based on the conversion coefficient.

Preferably, the step (d) reflects the system correction coefficient related to the system loss to the electromagnetic wave reflection cross-sectional area value of the first and second electromagnetic wave reflection cross-sectional area based on the log conversion coefficient to calculate the final electromagnetic wave reflection cross-sectional area value. And calculating.

 Preferably, the electromagnetic wave reflection cross-sectional area may be measured based on a specific vertical polarization or horizontal polarization measured with respect to the measurement object.

Preferably, the arrangement of the measurement object, the transmission signal source, and the receiver, and the reception power are pre-adjusted based on the electromagnetic wave reflection cross-sectional area measured with respect to the standard measurement object, wherein the standard measurement object is a rectangular plate, a cylinder, and a sphere. It may be.

A second aspect of the present invention for achieving the above object is a method for measuring and imaging an electromagnetic wave cross-sectional area, comprising: (a) outputting a signal from a transmission signal source to measure an image of the first electromagnetic wave reflection cross-section for a measurement object; (b) when the receiver receives the signal reflected from the measurement object, checking the voltage of the received signal to attenuate the output of the signal output from the transmission signal source so that the receiver does not become saturated; (c) outputting an attenuated signal from the transmission signal source to measure an image of a second electromagnetic wave reflection cross-sectional area of the measurement object; And (d) extracting an image of the measurement object based on the images of the first and second electromagnetic wave reflection cross-sectional areas.

Preferably, the step of measuring the image of the electromagnetic wave reflection cross-sectional area reflected from the background for the measurement object without outputting the signal, the electromagnetic wave absorber for shielding the reflected wave is installed in the background of the measurement object; And extracting a background image for the measurement object based on the background electromagnetic wave reflection cross-sectional area.

Preferably, after extracting and correcting a difference image between the extracted image and the background image based on the first and second electromagnetic wave cross-section images, the method further includes extracting a final image for the measurement object. You can.

A third aspect of the present invention for achieving the above object is an electromagnetic wave reflection cross-sectional area measurement and imaging system, comprising: a transmission signal source for outputting a signal; An antenna and a receiver output from the transmission signal source and receiving a signal reflected from a measurement object; A detector that converts the signal received from the receiver into a voltage; And attenuating the signal output from the transmission signal source so that the receiver does not become saturated according to the voltage checked through the detector, and the electromagnetic wave reflection cross-sectional area for the measurement object according to the output of the signal output from the transmission signal source. And a computer that calculates the electromagnetic wave reflection cross-sectional area value for the measurement object and extracts the electromagnetic wave reflection cross-sectional image.

According to the present invention as described above, by using the RCS polarized image data of the measurement object, there is an effect that can be applied to the RCS optimization of the structure to be measured by visually confirming the shape and position of the electromagnetic wave reflection cross-sectional area, and existing RCS measurement Unlike a device, there is no need to use a large-scale electromagnetic wave irreflection facility and expensive measurement equipment, and the device is small and simple, and has a very low cost advantage compared to existing measurement equipment. In addition, interference (multi-path) generated in the structural shape of the measurement object has an advantage that can be illustrated as an image, and has an effect that can be applied to structural shape optimization to reduce RCS by minimizing interference. .

That is, all modern combat power depends on whether or not detected by radar, and stealth technology to minimize the detection of aircraft, ships, and vehicles from radar is a cutting-edge technology that emerges as the core technology of modern defense. Therefore, military aircraft, ships, vehicles, etc. should be designed to be the structure shape of the smallest reflected cross-sectional area so that the reflected electromagnetic wave cross-section (RCS: Radar Cross Section) is not detected by the radar, and the present invention is such stealth function It can be used as equipment used to design and manufacture a shape having a.

1 is a block diagram of an electromagnetic wave reflection cross-sectional area measurement and imaging system according to a preferred embodiment of the present invention.
2A is a perspective view of an electromagnetic wave reflection cross-sectional area measurement and imaging system according to an embodiment.
2B is a view of a support device according to an embodiment.
2C is a perspective view of an electromagnetic wave reflection cross-sectional area measurement and imaging system according to an embodiment.
3 is a block diagram of a receiver for each polarization according to an embodiment.
4 is a block diagram of a computer of an apparatus for measuring and imaging an electromagnetic wave reflection cross-section according to an embodiment.
5 is a flowchart of a method for measuring and imaging an electromagnetic wave reflection cross-section according to an embodiment.
6 is an exemplary view of a standard measurement object.
7 is a diagram illustrating an arrangement between a measurement object, a transmission signal source, and an antenna of a receiver when measuring RCS according to an embodiment.
8 is an exemplary view showing an electromagnetic wave reflection cross-sectional area measurement obtained by attenuation of a signal output from a transmission signal source.
9 is an exemplary view showing converted data.
10 is an exemplary view showing a final electromagnetic wave reflection cross-sectional measurement value.
11 is a flowchart of a method for measuring and imaging an electromagnetic wave reflection cross-section according to another embodiment.
12 is a diagram illustrating an arrangement between a measurement object, a transmission signal source, and an antenna of a receiver when measuring an image according to an embodiment.
13 is a flowchart of a method of correcting a background electromagnetic wave reflection cross-sectional area.
14 is an exemplary view showing before and after correction of a background image according to a background electromagnetic wave reflection cross-sectional area.
15 is a comparative example diagram of a cross-sectional area of the electromagnetic wave measured by the apparatus and a simulation of a standard measurement object of a sphere, a cylinder, and a square according to an embodiment of the present invention.
FIG. 16 is an exemplary view showing a simulation according to frequency and a measured cross-sectional area of electromagnetic waves for a standard measurement object of a sphere, a cylinder, and a square according to another embodiment of the present invention.
17 is an exemplary view of an imaged electromagnetic wave reflection cross-sectional area of a model aircraft reduced according to the present invention.

Hereinafter, advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the present embodiments allow the disclosure of the present invention to be complete, and the ordinary knowledge in the technical field to which the present invention pertains. It is provided to fully inform the holder of the scope of the invention, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification. “And / or” includes each and every combination of one or more of the items mentioned.

Although the first, second, etc. are used to describe various elements, components and / or sections, it goes without saying that these elements, components and / or sections are not limited by these terms. These terms are only used to distinguish one element, component or section from another element, component or section. Accordingly, it goes without saying that the first element, the first component or the first section mentioned below may be the second element, the second component or the second section within the technical spirit of the present invention.

In addition, in each step, an identification code (for example, a, b, c, etc.) is used for convenience of explanation, and the identification code does not describe the order of each step, and each step is clearly specified in context. Unless the order is specified, it may occur differently from the order specified. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

The terminology used herein is for describing the embodiments and is not intended to limit the present invention. In this specification, the singular form also includes the plural form unless otherwise specified in the phrase. As used herein, “comprises” and / or “comprising” refers to the components, steps, operations and / or elements mentioned above, the presence of one or more other components, steps, operations and / or elements. Or do not exclude additions.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used as meanings commonly understood by those skilled in the art to which the present invention pertains. In addition, terms defined in the commonly used dictionary are not ideally or excessively interpreted unless specifically defined.

In addition, in describing embodiments of the present invention, when it is determined that a detailed description of known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to a user's or operator's intention or practice. Therefore, the definition should be made based on the contents throughout this specification.

1 is a configuration diagram for an electromagnetic wave reflection cross-sectional area measurement and imaging system according to a preferred embodiment of the present invention.

Referring to FIG. 1, the electromagnetic wave reflection cross-sectional area measurement and imaging device includes a transmission signal source 110, an electromagnetic wave reflection cross-sectional area measurement and imaging device 120, and a support device 130.

The transmission signal source 110 is a device that outputs a signal for measuring the electromagnetic wave reflection cross-sectional area of a measurement object having a reduced size. Preferably, the transmission signal source 110 is a narrow-band signal source of a continuous wave (CW), a wideband signal source, noise, frequency modulation (FM), and frequency modulation continuous (FMCW). Frequency modulated continuous wave (LFM), linear frequency modulation (LFM), pulse (Pulse), pulse modulation (Pulse modulation) or similar, may include a modulated wideband signal source, for example, transmission The signal output from the signal source 110 may be a W-band millimeter wave noise or a continuous signal. Further, the transmission signal source 110 may be composed of the aforementioned W-band signal source or termination, isolator, amplifier, bandwidth filter, variable attenuator, circular polarization converter, and circular polarization antenna. However, a signal source of a frequency in a band other than the W-band may be used.

The electromagnetic wave cross-sectional area measurement and imaging device 120 is a device that outputs from the transmission signal source 110 and receives the reflected signal from the measurement object to perform electromagnetic wave cross-sectional area measurement and imaging, for example, W-band millimeter wave It may be a noise illuminated radiometer.

Preferably, the electromagnetic wave reflection cross-sectional area measurement and imaging device 120 is a bi-static method to scan the position of the receiver 121 after fixing the position of the measurement object, or the transmission signal source 110 and the receiver 121 After mounting in the same location, the mono-static method of simultaneously scanning the transmission signal source 110 and the receiver 121 can measure and image the electromagnetic wave reflection cross-sectional area of the reduced measurement object.

The electromagnetic wave reflection cross-sectional area measurement and imaging device 120 includes a receiver 121, a detector 122, a video camera 123, a computer 124, and a scanner 125. It also includes a power supply 126.

The receiver 121 is a device that receives a signal reflected from a measurement object, and may be composed of a waveguide-microstrip converter, an amplifier, a bandwidth filter, and a square law detector.

The receiver 121 is driven by the scanner 125, and data received and measured from the receiver 121 is provided to the computer 124.

The detector 122 is a square detector of the receiver 121, which is a circuit that converts the received power collected by the radio meter into a voltage signal, and amplifies the output voltage so that the difference between the lowest and highest output voltages of the detector 122 is 10V or The output of the detector 122 is adjusted to be a voltage corresponding to an analog to digital converter (ADC) input voltage range. Here, the difference between the lowest and highest output voltages may be 5V, 6V, or 20V for signal resolution. Preferably, the output circuit of the detector 122 may be composed of a low-noise instrument amplifier, a video offset amplifier, and a buffer amplifier.

The video camera 123 is an auxiliary device for providing an image of a measurement object for RCS measurement recording, and a black and white or color video camera may be used, and the video camera image may be output through the computer 124. That is, the video camera is for recording an object to be measured and may not be used for RCS measurement.

The computer 124 controls the scanner 125, receives information from the receiver 121, the detector 122, and the video camera 123, measures the electromagnetic wave reflection cross-section, and receives data and images the electromagnetic wave reflection cross-section. .

 2A is a view showing the overall configuration of an electromagnetic wave reflection cross-sectional area measurement and imaging system according to an embodiment of the present invention, and FIG. 2B is a view showing a support device according to an embodiment of the present invention. According to an embodiment of the present invention shown in Figure 2a, a bi-static method is performed to scan the receiver after fixing the position of the measurement object.

Referring to Figure 2a, the electromagnetic wave cross-sectional area measurement and imaging device 120 includes a lens antenna 310, a lens antenna support 3100, a reflector 320, a reflector support 3200, a receiver 121, a detector 122 , A video camera 123, a computer 124 and a scanner 125.

The scanner 125 includes a base 1250 and a receiver driver 1256.

The base 1250 consists of a flat plate and is supported by a carrier 1252. The carrier 1252 includes a plurality of legs 1253 and wheels 1254. The scanner 125 is movable by a carrier 1252, and is configured to enable vertical and horizontal alignment through height adjustment of the wheel 1254 or length adjustment of each leg 1253.

The base 1250 is provided with a three-axis position sensor 1251 for horizontal and vertical alignment adjustment.

The receiver driver 1256 supports the receiver 121 and is driven to move in the X-Y direction. In the embodiment shown in Figure 2a, the receiver driver 1256 includes a two-axis linear step motor capable of precisely moving the receiver 121 in the X-Y direction. Accordingly, as the receiver 121 moves along the X-direction and Y-direction guides formed on the upper portion of the base 1250, electromagnetic waves can be received for reflected electromagnetic waves of vertical polarization and horizontal polarization for each specific polarization. It also includes a variable Z-axis so that the receiver 121 can be adjusted in the Z-axis direction.

The receiver 121 may perform an automatic continuous scan operation for receiving reflected waves while continuously moving in the X-Y plane and a discontinuous scan operation for receiving reflected waves by moving to specific positions in the X-Y plane by the receiver driver 1256.

According to an embodiment of the present invention, the Z-direction adjustment using a variable Z-axis is manually controlled, and the movement adjustment on the XY plane is configured to be automatically adjusted by a 2-axis linear step motor forming the receiver driver 1256, but other embodiments For example, the receiver 121 may be configured to automatically control movement in the XYZ direction by the receiver driver 1256. To this end, the receiver driver 1256 may further include a step motor capable of moving the receiver 121 in the Z-axis direction.

As described above, the receiver driver 1256 according to the present invention is configured to enable a scan operation to receive a reflected wave while automatically adjusting the position of the receiver 121 in the XY plane among the three dimensions of XYZ, and the receiver 121 is Z The Z-axis direction conveying unit for conveying in the direction may be formed of an automatic adjusting device such as a manual regulating device step motor such as a variable Z axis.

A lens antenna support 3100 and a reflector support 3200 are installed on the base 1250.

The lens antenna support part 3100 is installed at the front side from the base 1250 to support the lens antenna 310. The lens antenna support part 3100 is configured to be able to adjust the position of the lens antenna 310 in the front-rear direction and the height direction.

The lens antenna support part 3100 is supported at both ends by a holder 3102, guide rods 3104 and guide rods 3104 extending in the vertical direction from both sides of the holder 3102, each of which is a lens antenna 310 It includes upper and lower supports (3106, 3107) for supporting the upper and lower parts of the guide and a fixture (3108) for fixing the top of the guide rod (3104).

The upper and lower supports 3106 and 3107 are fixed to be movable in the vertical direction along the guide rod 3104, so that the height of the lens antenna 310 can be adjusted.

The cradle 3102 is supported by the slide 3120 installed on the base 1250, and is configured to be capable of positioning in the X-axis direction, that is, in the front-rear direction, from the top surface of the base 1250.

The base 1250 is provided with a handle 3122 for manually adjusting the front-rear movement of the cradle 3120 supported by the slide 3120, and enables manual movement in the front-rear direction of the lens antenna support 3100. . The handle 3122 is provided with a locking portion so that the lens antenna support 3100 and the lens antenna 310 supported thereby can be fixed in an adjusted position. The distance between the lens antenna 310 and the measurement object may be adjusted through the front-rear movement of the lens antenna support 3100.

The video camera 123 may be installed on the upper support 3107 of the lens antenna support 3100. Therefore, the position of the video camera 123 and the measurement object can be achieved with the distance between the lens antenna 310 and the measurement object.

The lens antenna 310 collects and passes signals reflected from the measurement object. The lens antenna 310 may be a W-band lens antenna.

The reflector support 3200 is installed on the rear side of the lens antenna support 3100, that is, on the opposite side of the measurement object based on the lens antenna 310. The reflector support 3200 may be formed of a support rod. The reflector support 3200 is installed on the base 1250 in the vertical direction, and the reflector 3200 may be installed to enable angle adjustment and height adjustment through the reflector support 3200 on the upper portion of the reflector support 3200. . It can also be installed detachably.

The reflector 320 is installed on the reflector support 3200 to be aligned through angle and height adjustment, and the signal passing through the lens antenna 310 is reflected to the understanding receiver 121 on the reflector 320.

The receiver 121 is driven by the scanner 125, more specifically, the receiver driver 1256, and receives a signal reflected by the reflector 320. The receiver 121 is provided with a receiving antenna 330 to receive a signal reflected by the reflector 320.

The receiving antenna 330 includes a horizontally polarized antenna and a modified polarized antenna, or a circularly polarized antenna.

In one embodiment, as shown in Figure 3 (a), the receiving antenna 330 of the receiver 121 may be composed of a horizontally polarized antenna 331, and a vertically polarized antenna 332. In this case, the horizontal and vertical polarization characteristics of the measurement object can be measured simultaneously. In this case, the receiver 121 and the detector 122 may be formed corresponding to each of the horizontally polarized antenna 331 and the vertically polarized antenna 332. In another embodiment, as shown in (b) of FIG. 3, the receiving antenna of the receiver 121 may be configured as a circularly polarized antenna 333. In this case, in order to measure the polarization characteristics of the measurement object, the receiver 121 is divided into horizontal and vertical polarizations, and the electromagnetic wave reflection cross-sectional area for the vertical and horizontal polarization of the measurement object can be measured for each polarization.

The receiver 121 is driven by the scatter 125 and more specifically, the receiver driver 1256, and data received and measured from the receiver 121 is provided to the computer 124.

According to an embodiment of the present invention, the detector 122 is disposed adjacent to the receiver 121, and the computer 124 may be installed on the base 1250.

According to the embodiment shown in FIG. 2A, since the lens antenna support 3100 and the reflector support 3200 are installed on the base 1250 of the scanner 125, the scanner 125 is provided with the lens antenna 310 through the base 1250. ) And reflector 320.

As shown in FIG. 2A, the measurement object is supported by the support device 130, and the transmission signal source 110 is installed on both sides of the electromagnetic wave reflection cross-sectional area measurement and imaging device 120 to measure the electromagnetic wave reflection cross-sectional area of the measurement object. Outputs the signal to do. In addition, the electromagnetic wave cross-sectional area measurement and imaging device 120 may receive a signal reflected by the measurement object and perform electromagnetic wave cross-sectional area measurement and imaging.

2A and 2B, the support device 130 is a structure for supporting a measurement object, and a rotating plate (for adjusting the angle of the measurement object by rotating the support 131 and the support 131 on which the measurement object is placed) 132).

Here, the support 131 is an RF support with little reflection, and may be made of a low-loss material having a dielectric constant of about 1, and the rotation angle of the measurement object through the rotating plate 132 can be accurately rotated 360 degrees. The angle can be adjusted by about 1 degree.

The support 131 may include a three-axis position sensor 134 for horizontal and vertical arrangement.

In addition, a wall of the absorber 133 may be installed around the support device 130. The absorber 133 absorbs electromagnetic waves coming from the surrounding environment (for example, walls, ceilings, floors, and other surrounding facilities in the space where the system is implemented), thereby minimizing electromagnetic interference caused by the surrounding environment to reduce measurement errors. Preferably, the absorber 133 may correspond to an RF absorber having the smallest reflection at a frequency of a signal to be used. That is, the measurement object is mounted on the RF absorber 133 with little reflection, the RF support 131 and the rotating plate 132 that rotates the RF support so that the electromagnetic wave reflection cross-sectional area can be measured and imaged.

2C is a perspective view showing a modified example of an electromagnetic wave reflection cross-sectional area measurement and imaging system according to an embodiment of the present invention.

Referring to Figure 2c, the electromagnetic wave reflection cross-sectional area measurement and imaging system according to an embodiment of the present invention, compared to the embodiment shown in Figure 2a, the transmission signal source 110 and the support device 130 measures the electromagnetic wave reflection cross-sectional area And it is different in that it is integrally configured by being coupled to the imaging device 120.

Referring to Figure 2c, the transmission signal source 110 is fixed to the support plate 1110 formed to be stretchable and rotatable, the support plate 1110 is supported by the lifting member 1120 to be adjustable in height. The support plate 1110 includes a first support plate 1112, a second support plate 1116 and a rotation coupling member 1114.

The first support plate 1112 is fixed to the transmission signal source 110 on one side of the upper surface. The transmission signal source 110 is rotatably coupled with respect to the first support plate 1112 to form an alignment and angle adjustment with a measurement object supported by the support device 130.

The second supporting plate 1116 is coupled to the first supporting plate 1112 by a rotating coupling member 114 in a state overlapping the first supporting plate 1112 on one side. The first supporting plate 1112 is formed to be slidable along the second supporting plate 1116 so that the length can be adjusted. To this end, a guide slot may be formed in the second supporting plate 1116. The other side of the second supporting plate 1116 may be coupled to one side of the electromagnetic wave reflection cross-sectional area measurement and imaging device 120 by the lifting member 1120, for example, the base 1250.

The rotation coupling member 1114 may be formed to be rotatable with respect to a guide and a guide coupled to a guide slot of the second support plate 1116, and may be formed in a form having a rotating portion fixed to the other side of the first support plate. As the rotation coupling member 1114 along the guide slot moves in a state in which it is coupled with the first supporting plate 1112, the lengths of the overlapping of the first supporting plate 1112 and the second supporting plate 1116 are changed, so that the supporting plate 1110 is changed. The length can be adjusted.

In addition, the first supporting plate 1112 via the rotating coupling member 1114 is rotated relative to the second supporting plate 1116 to make it possible to bend a predetermined angle.

Although the embodiment described with reference to FIG. 2C is configured to allow both length adjustment and bending through the rotation coupling member 1114, the first supporting plate 1112 and the second supporting plate 1114 are elastically coupled and the second It is also possible that the base plate 1116 is rotatably coupled to the base 1250.

In this way, the base plate 1110 according to an embodiment of the present invention is provided with a telescopic portion and a rotating portion, so that the telescopic and angular adjustment is possible.

The support plate 1110 is supported by a plurality of lifting members 1120 to enable height adjustment. As the elevating member 1120, an elevating rod capable of height adjustment while stretching in the height direction may be used. The lifting rods are respectively installed on the first supporting plate 1112 and the second supporting plate 1116 to ensure stability during expansion and rotation of the supporting plate 1110, and the other side and the base 1250 of the second supporting plate 1116. It is also joined through a lifting rod.

The elevating member 1120 is provided with a wheel at the bottom, and thus has ease of movement when the base plate 1110 is stretched and angled.

According to an embodiment of the present invention, the support device 130 may be coupled to the stretching and rotation control of the electromagnetic wave reflection cross-sectional area measurement and imaging device 120 through the connecting plate 1301.

The connecting plate 1301 for fixing the support device 130 to the electromagnetic wave cross-sectional area measuring and imaging device is formed similarly to the connecting plate 1110 connecting the transmitting signal source 110 to the electromagnetic wave cross-sectional area measuring and imaging device.

That is, the connecting plate 1301 includes a first connecting plate 1302, a second connecting plate 1306, and a rotation coupling member 1304, which is the same as the configuration of the supporting plate 1301.

The first connecting plate 1302 is coupled to the rotating plate 132 of the support device 130 to one side. The rotating plate 132 is coupled to the first connection plate 1302 to allow angle adjustment through rotation.

The second connecting plate 1306 is coupled through the rotating coupling member 1304 in an overlapped state with the first connecting plate 1302 on one side, and the rotating coupling member 1304 has a second connecting plate 1302. It is slidable along the connecting plate 1306, and the first connecting plate 1302 is foldably coupled to the second connecting plate 1306.

Wheels are attached to the lower side of the rotating plate 132 and the rotating coupling member 1304 to facilitate movement to the bottom surface.

According to the embodiment shown in Figure 2c, the electromagnetic wave reflection cross-sectional area measurement and imaging device 120, the transmission signal source 110 and the support device 130 for supporting the measurement object electromagnetic wave reflection cross-sectional area measurement and imaging device ( 120), thereby height, distance, angle and horizontal adjustment can be made easier.

4 is a block diagram of a computer of an apparatus for measuring and imaging an electromagnetic wave reflection cross-section according to an embodiment.

4, the computer 124 includes a data acquisition unit 410, a data processing unit 420, a scanner control unit 430, and a control unit 440, preferably, the data processing unit 420 is an RCS measurement A module 421 and an RCS imaging module 422 may be included.

The data acquisition unit 410 receives data obtained from the receiver 121, the detector 122, and the video camera 123, and the data processing unit 420 is based on the data provided from the data acquisition unit 410. The cross-sectional area of the electromagnetic wave for the measurement object is measured or imaged. The specific operations performed in the RCS measurement module 421 and the RCS imaging module 422 of the data acquisition unit 410 will be described below with reference to FIGS. 5 and 11.

The scanner control unit 430 controls a moving section or a moving speed of the scanner 125. According to an embodiment of the present invention, since the scanner 125 receives the reflected wave while automatically moving the receiver 121 in the X-Y plane by the receiver driver 1256, it may be referred to as a 2D scanner 125.

The control unit 440 controls the operation and data flow of the data acquisition unit 410, the data processing unit 420, and the scanner control unit 430.

5 is a flowchart of a method for measuring an electromagnetic wave reflection cross-section according to an embodiment.

First, in order to measure the electromagnetic wave reflection cross-sectional area for the measurement object, the electromagnetic wave reflection cross-sectional area measurement and imaging device 120 may be adjusted to the RCS measurement mode.

Prior to step S510, the measurement object, the transmission signal source 110, and the arrangement of the receiver 121, and the received power of the receiver 121 may be adjusted in advance based on the electromagnetic wave reflection cross-sectional area value measured for the standard measurement object. . Here, the standard measurement object is an object having the same electromagnetic wave reflection cross-sectional area measured value based on the theory and the electromagnetic wave reflection cross-sectional area measurement and imaging system according to the present invention. ) To (c) may correspond to a rectangular plate, a cylinder, and a sphere each composed of two or more sizes. That is, if the value of the electromagnetic wave reflection cross-section of a standard measurement object measured using the electromagnetic wave reflection cross-sectional area measurement and imaging system according to the present invention is correct, it can be said that the measurement accuracy of another measurement object is also accurate, so it is measured using a standard measurement object The arrangement of the object, the transmission signal source 110, and the receiver 121, and the reception power are adjusted.

More specifically, for each of the rectangular plates, cylinders, and spheres, which are the standard measurement objects, the electromagnetic wave reflection cross-sectional areas for each of the vertical and horizontal polarizations are measured, and the measured measurement values and the simulated electromagnetic wave cross-sectional area measurements are compared. Then, the accuracy is checked, and the measurement target, the arrangement of the transmission signal source 110, and the receiver 121, and the received power are adjusted so that the accuracy of a predetermined specific reference is obtained. , The operation of checking the accuracy again may be repeated.

Preferably, the arrangement of the measurement object, the transmission signal source 110, and the lens antenna 310 of the receiver 121 can be adjusted as shown in FIG. 7, and the transmission signal source 110, the measurement object, and the lens The angle between the antennas 310 may be arbitrarily set according to the angle of the RCS measurement range. Here, the lens antenna 310 and the measurement object may be disposed at a short distance so that focus is not formed, and through this, a plane wave without focusing on the measurement object may be directed to the measurement object. In addition, a line of sight of the measurement object and the lens antenna 310 may be aligned so that the output voltage of the detector 122 becomes a maximum value.

When the arrangement of the measurement object, the transmission signal source 110, and the lens antenna 310 of the receiver 121 is adjusted using the standard measurement object, the RCS measurement module 421 of the data processing unit 420 transmits The signal is output from the signal source 110 to measure the first electromagnetic wave reflection cross-sectional area for the measurement object (step S510). Preferably, the electromagnetic wave reflection cross-sectional area can be simultaneously measured for each vertical and horizontal polarization with respect to the measurement object.

When the receiver 121 receives the signal reflected from the measurement object, the detector 122 converts the power of the received signal into a voltage, and the RCS measurement module 421 prevents the output value of the receiver 121 from becoming saturated. , Attenuate the output of the signal output from the transmission signal source 110 (step S520). The RCS measurement module 421 outputs the attenuated signal from the transmission signal source 110 to measure the second electromagnetic wave reflection cross-sectional area for the measurement object (step S530), and measures the measurement object based on the first and second electromagnetic wave reflection cross-sectional areas The final electromagnetic wave reflection cross-sectional area value is calculated (step S540). Here, while the receiver 121 is moved from side to side by the scanner 125, the object to be measured is determined according to the angular range, that is, the angle between the transmission signal source 110 and the object to be measured and the distance between the lens antenna 310 and the object. It enables RCS measurement in the range of visible angles.

More specifically, the RCS measurement module 421 may convert the measured data for the first and second electromagnetic wave reflection cross-sectional areas into converted data using Equation 1 below, and extract the converted coefficients. For example, when the electromagnetic wave reflection cross-sectional area according to the attenuation of the output signal is measured as shown in FIG. 8, the converted data can be obtained as shown in FIG.

[Equation 1]

Here, S is a scaling factor, X1 is measurement data using an original signal, X2 is measurement data using a first attenuated signal, X3 is measurement data using a second attenuated signal, ... X8 is measurement data using the 7th attenuated signal. For example, when defining the width of the receiving antenna beam width as -3dB as a reference point, the attenuation of the output signal can be adjusted in units of -3dB, X1 is 0dB attenuated measurement data, X2 is 3dB attenuated measurement The data, and X8 may correspond to 21 dB attenuated measurement data.

Further, the attenuation of the output signal may be adjusted so that the dynamic range of the receiver 121 can obtain a specific size. For example, if the dynamic range of the receiver 121 itself is about 10 dB, in order to extend the dynamic range to 30 dB, 3 dBX7 step including margin = 21 dB, so that a dynamic range of 31 dB in total can be measured, and the signal is 3 dB each. It can be adjusted to attenuate.

Next, the RCS measurement module 421 converts the converted data into decibel (dB) data using (1) of [Equation 2] below, and uses (2) to (6) of [Equation 2]. The logarithmic conversion coefficient can be calculated based on the conversion coefficient. [Equation 2] is a case where signals are attenuated by 3 dB, and [Equation 2] may be modified according to the degree of attenuation.

[Equation 2]

10

log (X1) = P1 -------------------- (1)LS

10

log (X1) = P1 -------------------- (1)

10

log (X2) = P1 - 3 dB ---------------- (2)LS

10

log (X2) = P1-3 dB ---------------- (2)

10

log (X1

)Left side = LS

10

log (X1

)

10

log(S) = P1 - 3 dB ------------(3)= P1-LS

10

log (S) = P1-3 dB ------------ (3)

3 dB = LS

10

log(S) --------------------- (4)

3 dB = LS

10

log (S) --------------------- (4)

S = 1.854 -------------------------------------- (5)

Log-scaling factor LS = 1.118945 --------------- (6)

RCS values measured with RCS measurement mode:

Final RCS value = P1 + SCF ---------------------- (7)

RCS values measured with RCS imaging mode:

Final RCS value = SUM (P1 +… + P _{total_piexel} ) + ISCF --- (8)

Here, LS is a log-scaling factor, SCF is a system correction factor, and P1 is an RCS value before SCF is corrected. The system correction coefficient SCF and the scaling factor S can be adjusted according to the system.

Next, the RCS measurement module 421 uses (7) in [Equation 2] to reduce the system loss to the electromagnetic wave reflection cross-sectional area value obtained by combining the first and second electromagnetic wave reflection cross-sections based on the log conversion coefficient. The final electromagnetic wave reflection cross-sectional area value can be calculated by reflecting the system correction factor associated with. That is, the RCS extraction module 421 synthesizes the measured data for each attenuation section and extracts the measurement value of the reflected area of the electromagnetic wave in a section with a variation in the received signal strength of 30 dB or more, and finally, the spatial loss, the lens antenna 310, and the reflector The final electromagnetic wave reflection cross-sectional area value is calculated in consideration of a system correction factor (SCF), which is a system correction factor including 320 and a reception antenna and WG transition. Here, SCF is calculated as the difference between P1 in (1) of [Equation 2] and the simulated RCS value of the measurement object. For example, the final electromagnetic wave reflection cross-sectional area value can be obtained as shown in FIG. 10.

In one embodiment, after the step S530, when the receiver 121 receives the attenuated signal reflected from the measurement object, the RCS measurement module 421 checks the voltage of the received attenuated signal so that the receiver 121 In order not to be saturated, the output of the signal output from the transmission signal source 110 can be attenuated again. Here, through the attenuation and re-attenuation of the signal, the dynamic range (DR) of the receiver 121 may be expanded to 30 dB, and the output of the attenuated or re-attenuated transmission signal source is 30 dB or more. That is, although the dynamic range of a general radiometer is about 10 dB, according to the present invention, the dynamic range can be extended to 30 dB through attenuation and re-attenuation of the signal for measurement of the electromagnetic wave reflection area. Then, the RCS measurement module 421 may output a re-attenuated signal to measure the third electromagnetic wave reflection cross-sectional area of the measurement object. In this case, in step S540, the final electromagnetic wave reflection cross-sectional area value for the measurement object may be calculated based on the first to third electromagnetic wave cross-sectional areas. That is, the attenuation of the signal output from the transmission signal source 110 may be repeated one or more times depending on the performance of the detector 122, and the final electromagnetic wave reflection cross-sectional area value is the electromagnetic wave reflection cross-sectional area measured according to the attenuation of the signal. It is calculated using these.

11 is a flowchart of a method for measuring and imaging an electromagnetic wave reflection cross-section according to another embodiment.

First, in order to image the electromagnetic wave reflection cross-sectional area for the measurement object, the electromagnetic wave reflection cross-sectional area measurement and imaging device 120 may be adjusted to the RCS imaging mode.

Prior to step S1110, the arrangement of the measurement object, the transmission signal source 110, and the receiver 121, and the received power may be adjusted in advance based on the electromagnetic wave reflection cross-sectional area measured for the standard measurement object. Preferably, the arrangement of the measurement object, the transmission signal source 110, and the receiver 121, and the method in which the received power is adjusted using the standard measurement object, the contents described with reference to FIG. 5 may be equally applied and measured The arrangement of the object, the transmission signal source 110, and the lens antenna 310 of the receiver 121 can be adjusted as shown in FIG. 12, through which the electromagnetic wave output from the transmission signal source 110 is measured. Focus can be established. More specifically, referring to FIG. 12, the focal length F between the measurement object, the lens antenna 310, and the reflector 320 satisfies (1 / S ₁ ) + (1 + S ₂ ) = (1 / F) Can be adjusted.

After the measurement object, the arrangement of the transmission signal source 110, and the receiver 121, and the received power are adjusted, the RCS imaging module 422 outputs a signal from the transmission signal source 110 to firstly measure the measurement object. The image of the electromagnetic wave reflection cross-sectional area is measured (step S1110).

When the receiver 121 receives the signal reflected from the measurement object, the RCS imaging module 422 outputs from the transmission signal source 110 so that the receiver 121 is not saturated by checking the voltage of the received signal. The output of the signal to be attenuated is reduced (step S1120), and the attenuated signal is output from the transmission signal source to measure an image of the second electromagnetic wave reflection cross-sectional area of the measurement object (step S1130). The description of steps S510 to S530 described with reference to FIG. 5 may be applied to steps S1110 to S1130. However, in the RCS imaging module 422, since the distance between the object to be measured and the lens antenna 310 is far, based on the beam width of the lens antenna 310, almost the center width of the lens antenna 310 (that is, the beam width is 1 to 2 degrees) RCS for) is measured and imaged.

An image of a measurement object is extracted based on the images of the first and second electromagnetic wave reflection cross-sectional areas (step S1140). Preferably, the image of the background electromagnetic wave reflection cross-section for the measurement object is measured without outputting a signal from the transmission signal source 110 separately from the steps S1110 to S1130, and the background image for the measurement object is based on the image of the background electromagnetic wave reflection cross-section. The step of extracting may be further performed. This is to correct the influence of the reflected wave from the absorber installed around the measured object in order to shield the reflected wave from the periphery of the measurement object. The RCS imaging module 422 extracts and corrects a difference image between the extracted image and the background image based on the first and second electromagnetic wave cross-sectional areas, and then extracts a final image for the measurement object. That is, in order to improve measurement accuracy by reducing interference and reflection signals from an environment or an obstacle, a background image is extracted and corrected.

In step S1140, measurement data for the first and second electromagnetic wave reflection cross-sectional areas are converted into conversion data, a conversion coefficient is extracted, the conversion data is converted into decibel (dB) data, and a log conversion coefficient is calculated based on the conversion coefficient. Computation, the first and second electromagnetic wave reflection cross-sectional area based on the log conversion coefficient to reflect the system correction coefficient related to the system loss to the combined electromagnetic wave reflection cross-sectional area value, the configuration for calculating the final electromagnetic wave reflection cross-section value is, The contents described with reference to [Equation 1] and [Equation 2] may be applied. That is, the RCS imaging module 422 synthesizes measured data for each attenuation section and extracts an RCS value of 30 dB or more, and finally, system loss including spatial loss, lens antenna, reflector and receiving antenna, and WG transition Considering the image system correction factor (ISCF), the RCS 2D image having a dynamic range of 30 dB is extracted. However, (1) to (7) in [Equation 2] is used when extracting RCS measurement values in the RCS measurement mode, and (1) to (6) and (8) in [Equation 2] are RCS imaging It is used to extract RCS image measurement values in the mode. That is, (8) in [Equation 2] indicates that the value measured by each pixel in the entire image, that is, the value of ISCF correction to the sum of all powers corresponds to the final RCS image measurement value of the measurement object. . Here, ISCF is calculated as a difference between a simulated RCS image value of a measurement object and a measured RCS image value.

Preferably, the RCS imaging module 422 converts measurement data for the background electromagnetic wave reflection area to decibels (dB) data, and uses a logarithmic conversion coefficient calculated based on the measurement data for the first and second electromagnetic wave reflection area. The background image can be extracted by reflecting the image system correction coefficient related to the system loss in the background electromagnetic wave reflection area value. Here, the process of extracting the background image may be applied to the contents described with reference to FIGS. 5, [Equation 1], and [Equation 2] above.

Next, the RCS imaging module 422 extracts a difference image between the extracted image and the background image based on the measurement data for the first and second electromagnetic wave reflection cross-sectional areas, corrects for the measurement object, and extracts the final image. have.

More specifically, a method for measuring the background electromagnetic wave reflection cross-sectional area will be described. Here, the process of measuring the background electromagnetic wave reflection cross-sectional area may be performed before step S1110 or after step S1140, but may be performed irrespective of the order with each step shown in FIG. 11. Preferably, the periphery of the measurement object is configured as an anti-reflective environment to reduce the reflected signal, and by measuring the background electromagnetic wave, the reflected signal generated from the periphery of the measurement object can be corrected.

Referring to FIG. 13, the RCS imaging module 422 scans the background of an object to be measured for each polarization in the case of a liquid nitrogen and a hot absorber in the case of a cold source. Each pixel (pixel) is obtained (step S1310). In order to measure a certain temperature, at least two reference temperatures (low and high temperatures) are required, and the cold source is the most stable liquid nitrogen present on the earth as a reference temperature measurement object. The low temperature standard for a bar cold equivalent to 77 Kelvin may correspond to 77 Kelvin. The hot source is used as a high temperature reference, and the absorber may be used when the temperature is constant (for example, 300K at room temperature) or a matched load (usually using 50 ohm termination) or in a space where the temperature is constant. Here, the absorber is used for the purpose of anti-reflection of electromagnetic waves, and the reflection should be less than -40 ~ -50dB. That is, the absorber used as a hot source means a hot source having a constant value of 300K without a reflected wave.

The RCS imaging module 422 extracts parameters for brightness temperature conversion of the image using Equation 3 below based on the measured value for each image pixel obtained in step S1310 (step S1320).

[Equation 3]

는 각 픽셀에 대한 기울기 계수,

는 각 픽셀에 대한 절편 계수,

는 핫 타겟(hot target)의 BT,

는 콜드 타겟(cold target)의 BT,

는 핫 타겟에 대한 각 픽셀의 획득전압,

는 콜드 타겟에 대한 각 픽셀의 획득전압을 나타낸다.From here,

Is the slope factor for each pixel,

Is the intercept factor for each pixel,

Is the BT of the hot target,

Is the BT of the cold target,

Is the acquisition voltage of each pixel for the hot target,

Denotes the acquisition voltage of each pixel with respect to the cold target.

The RCS imaging module 422 extracts the brightness temperature of the image for the absorber in the background to correct the image generated from the background using Equation 4 below (step S1330).

[Equation 4]

는 배경 흡수체 영상의 각 픽셀에 대한 밝기온도(brightness temperature: BT), X_i,j는 영상에서 각 픽셀별 측정 위치에 따른 각 픽셀에 대한 전압값을 나타낸다. 배경 흡수체로부터 측정된 각 픽셀의 출력전압은

이며 [수식 3]에서 구한

,

값을 이용하여 흡수체 배경에 대한 밝기온도 값

이 구해진다. From here,

Is the brightness temperature (BT) for each pixel of the background absorber image, and X _{i, j} represents the voltage value for each pixel according to the measurement position for each pixel in the image. The output voltage of each pixel measured from the background absorber is

And obtained from [Equation 3]

,

Using the value, the brightness temperature value for the absorber background

This is saved.

When the brightness temperature value of the image for the background absorber is extracted in step S1330, the RCS imaging module 422 corrects the difference and checks the correction state (step S1340). In one embodiment, if [Equation 5] below is satisfied, the background image is corrected, and a background image after correction as illustrated in FIG. 14B can be obtained from the background image before correction as illustrated in FIG. 14A. In other embodiments, if [Equation 5] below is not satisfied, steps S1310 to S1340 may be repeated by adjusting the arrangement of the absorber.

[Equation 5]

는 보정 후 측정된 배경의 각 픽셀별 밝기온도,

는 보정 전 각 픽셀별 밝기온도이며, 이 두 값이 일치하는지 여부로 보정이 이루어졌음 확인될 수 있다. 위의 배경에 대한 보정 예시는 RCS 배경 보정에도 같은 방법이 적용될 수 있다.From here,

Is the brightness temperature for each pixel of the measured background after correction,

Is the brightness temperature for each pixel before correction, and it can be confirmed that the correction was made based on whether these two values match. For the above background correction example, the same method may be applied to RCS background correction.

15 and 16 are exemplary views of an electromagnetic wave reflection cross-sectional area measured according to the present invention.

15 and 16, FIG. 15 is an example of an electromagnetic wave reflection cross-section for a measurement object measured using a continuous wave signal, and FIG. 16 is an example of an electromagnetic wave reflection cross-section for a measurement object measured using a noise signal. , A rectangular plate, a circular motion, and a spherical shape and an angle simulation (FEKO (GO)) value for an object to be measured and an electromagnetic wave reflection cross-sectional area value measured in the RCS measurement mode of the electromagnetic wave cross-sectional area measuring system according to the present invention. Here, the simulation value is a value calculated by numerical analysis for the ideal case.

The results shown in FIGS. 15 and 16 are the electromagnetic wave reflection cross-sectional area values when the measurement object is observed at 0 degrees and the electromagnetic wave reflection cross-sectional area values when observed at +/- 10 degrees, and the simulation values and the values measured according to the present invention You can see that they are almost exactly the same. In addition, when the object to be measured has a spherical shape and a cylindrical shape, the electromagnetic wave reflection cross-sectional area value is constant even when the observation angle changes, but in the case of a rectangular plate shape, it can be seen that the electromagnetic wave reflection cross-section value changes according to the observation angle.

15 and 16 show only the relationship between the measurement angle and the electromagnetic wave reflection cross-sectional area value on the XY axis. After measuring the electromagnetic wave reflection cross-section by rotating the measurement object, the polar coordinate system may represent the electromagnetic wave reflection cross-sectional area value, or the electromagnetic wave reflection cross-sectional area. The method of displaying the value is not limited to this, and various methods can be applied.

17 is an exemplary view of an electromagnetic wave reflection cross-sectional area imaged according to the present invention.

Referring to FIG. 17, as an example of an electromagnetic wave reflection cross-sectional area imaged with respect to a noise transmission signal source, a three-dimensional image of the electromagnetic wave reflection cross-sectional area for a reduced airplane model imaged according to the present invention is shown. Referring to FIG. 17, it can be seen that features of the reduced measurement object, that is, the shape of both wings, the shape of the airplane body, and the like, which are characteristics of the airplane, are shown. Accordingly, according to the present invention, a 3D image of a measurement object as shown in FIG. 17 can be obtained, and the shape and position of the electromagnetic wave reflection cross-sectional area can be visually confirmed and applied to RCS optimization of the structure to be measured.

On the other hand, the method for measuring and imaging an electromagnetic wave reflection cross-section according to an embodiment of the present invention may also be embodied as computer-readable codes on a computer-readable recording medium. The computer-readable recording medium includes all types of recording devices in which data readable by a computer system is stored.

For example, computer-readable recording media include ROM, RAM, CD-ROM, magnetic tapes, hard disks, floppy disks, removable storage devices, and non-volatile memory (Flash Memory). , Optical data storage, and the like.

In addition, the computer-readable recording medium may be distributed over computer systems connected by a computer communication network, and stored and executed as code readable in a distributed manner.

Although the preferred embodiments of the electromagnetic wave reflection cross-sectional area measurement and imaging method and system according to the present invention have been described above, the present invention is not limited thereto, and various modifications are made within the scope of the claims and detailed description of the invention and the accompanying drawings. It is possible to carry out and this also belongs to the present invention.

110: transmission signal source
120: Electromagnetic wave reflection cross-section measurement and imaging device
121: receiver 122: detector
123: video camera 124: computer
125: 2D scanner 126: power supply
130: support device 131: support
132: rotating plate 133: absorber
310: lens antenna 320: reflector
331: vertically polarized antenna 332: horizontally polarized antenna
333: circularly polarized antenna
410: data acquisition unit 420: data processing unit
421: RCS measurement module 422: RCS imaging module
430: scanner control unit 440: control unit

Claims (11)

A lens antenna that collects and passes a signal reflected from a measurement object output from a transmission signal source;
A reflector reflecting a signal from the lens antenna;
A receiver that receives a signal reflected from the reflector through a reception antenna;
A detector that converts power received from the receiver into a voltage;
A video camera that shoots an image of the measurement object; And
It has a scanner including a receiver driver for enabling a scan operation for receiving the reflected wave while the receiver moves in the XY plane,
Information of the receiver and the video camera can be provided to a computer for electromagnetic wave reflection cross-section and imaging,
The scanner includes a base,
The lens antenna is installed on the upper portion of the base, but includes a lens antenna support for supporting the lens antenna to enable height adjustment with respect to the base and a distance from a measurement object.
The lens antenna support,
A cradle installed to move back and forth in the slide installed on the base;
Guide rods extending in the height direction from both sides of the cradle;
Both ends are supported on the guide bar, and upper and lower supports supporting the upper and lower parts of the lens antenna; And
Electromagnetic wave reflection cross-sectional area measurement and imaging device, characterized in that it comprises a holder for supporting the top of the guide rod.
delete delete According to claim 1,
The video camera is an electromagnetic wave reflection cross-sectional area measurement and imaging device, characterized in that installed on the upper support.
According to claim 1,
The reflecting plate is installed on the base of the rear side of the lens antenna, the electromagnetic wave reflection cross-sectional area measurement and imaging device, characterized in that it comprises a reflecting plate support for supporting the height adjustment and angle adjustment.
According to claim 1,
The receiver driver of the scanner
Electromagnetic wave reflection cross-sectional area measurement and imaging device, characterized in that it comprises a step motor for driving in the XY direction while supporting the receiver.
The method of claim 6,
Electromagnetic wave reflection cross-sectional area measurement and imaging device further comprising a Z-axis transfer unit for moving the receiver in the Z direction.
According to claim 1,
The scanner,
With base,
It is installed on the base and includes a receiver driver for transferring in the XY direction while supporting the receiver on the upper part,
In the base, a lens antenna support is installed in front of the installation position of the receiver to support the lens antenna so that the height of the base and the distance to the measurement object can be adjusted.
A reflector support is installed on the rear side of the lens antenna support to support the height and angle of the reflector.
An electromagnetic wave reflection cross-sectional area measurement and imaging device characterized in that a carrier is provided on a lower surface of the base to enable movement and horizontal adjustment of the base.
According to claim 1,
The receiving antenna, a horizontally polarized antenna and a vertically polarized antenna, or a circularly polarized antenna, characterized in that it comprises an electromagnetic wave reflection cross-sectional area measurement and imaging device.
An electromagnetic wave reflection cross-sectional area measurement and imaging device according to any one of claims 1, 4 to 9,
A transmission signal source installed on a side of the electromagnetic wave cross-section measurement and imaging device to output a signal; And
It is installed on the front side of the electromagnetic wave cross-section measurement and imaging device, characterized in that it comprises a support device including a support for supporting the object to be measured, and a rotating plate for rotating the support to adjust the angle of the object to be measured. Electromagnetic wave reflection area measurement and imaging system.
The method of claim 10,
The transmission signal source is fixed to one side and the support plate formed to be stretchable and rotatable, and the support signal plate to which the transmission signal source is fixed can be elevated and connected, and the support plate is connected to one side of the electromagnetic wave cross-sectional area measurement and imaging device. Including a plurality of lifting members, the transmission signal source is coupled to the electromagnetic wave cross-sectional area measurement and imaging device;
The rotating plate of the support device is coupled to one side and fixed to the electromagnetic reflection cross-sectional area measurement and imaging device on the other side, and includes a connecting plate formed to be stretchable and rotatable, wherein the support device is provided to the electromagnetic wave reflection cross-sectional area measurement and imaging device. Combined; Electromagnetic wave reflection cross-sectional area measurement and imaging system.

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