KR101273102B1 - Ground-based rotational sar apparatus - Google Patents

Ground-based rotational sar apparatus Download PDF

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KR101273102B1
KR101273102B1 KR1020110138223A KR20110138223A KR101273102B1 KR 101273102 B1 KR101273102 B1 KR 101273102B1 KR 1020110138223 A KR1020110138223 A KR 1020110138223A KR 20110138223 A KR20110138223 A KR 20110138223A KR 101273102 B1 KR101273102 B1 KR 101273102B1
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ground
antenna
sar
auxiliary arm
arm
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KR1020110138223A
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Korean (ko)
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황지환
권순구
오이석
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홍익대학교 산학협력단
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06Systems determining position data of a target
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/76Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted
    • G01S13/78Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted discriminating between different kinds of targets, e.g. IFF-radar, i.e. identification of friend or foe
    • G01S13/9035
    • G01S2013/9082

Abstract

The present invention relates to a ground operation rotary SAR device. According to the present invention, one end portion is spaced apart from the ground, the auxiliary arm connected to one end of the main arm extending to the other side and rotatable in the horizontal direction with respect to the one end, and the other extended portion of the auxiliary arm It is connected to the upper and lower height adjustable and provides a ground-based rotary SAR device that includes an antenna to detect the ground target using the radar signal.
According to the ground-operated rotary SAR device, the structure is simple and easy to move by arranging a rotatable auxiliary arm on one end of the main arm spaced from the ground and installing an antenna for detecting the ground target at the end of the auxiliary arm. The operability is convenient.

Description

Ground-based rotational SAR apparatus

The present invention relates to a ground operational rotary SAR device, and more particularly, to a ground operational rotary SAR device capable of obtaining composite aperture data by connecting a radar transmitting and receiving antenna on a rotatable auxiliary arm.

Among the remote sensing methods that can apply radio waves of various frequency bands, the surface scattering characteristics analysis and radar image acquisition analysis research using the Synthetic Aperture Radar (SAR) system have recently been widely used, and many studies have been conducted. .

Such a SAR system generates an image and analyzes a target through a value in which radio waves emitted through an antenna are reflected and transmitted from a target. In this case, in the case of SAR, an image generation process is performed using the synthetic aperture data obtained by moving the position of the antenna with respect to the stationary target.

Such a SAR system is generally mounted on a satellite or an aircraft that is easy to move at constant speed, and is also mounted on a vehicle such as a vehicle for operation on the ground. Traditional SAR systems detect ground targets by moving antennas on rails. By the way, when using the rail is difficult to move and install the system.

As an example, Korean Patent No. 093283 discloses an arc composite diameter radar system. In this conventional case, image information about a target is obtained by moving an antenna on a circular rail. This requires a separate circular rail has a disadvantage of low operating efficiency and mobility.

The present invention provides a ground operation circuit that is simple in structure and easy to move and operate by arranging a rotatable auxiliary arm on one end of the main arm spaced from the ground and installing an antenna for detecting a target on the ground at the end of the auxiliary arm. The purpose is to provide a typical SAR device.

The present invention includes a main arm having one end spaced apart from the ground, an auxiliary arm connected to one end of the main arm and extending to the other side and rotatable in a horizontal direction with respect to the one end, and the other extended portion of the auxiliary arm. It is connected to the ground height adjustable and provides a ground-based rotary SAR device that includes an antenna for detecting the ground target using the radar signal.

Here, the ground operation rotating SAR device may further include a control unit for adjusting the vertical angle of the antenna to correspond to the height information of the ground on the ROI where the radar signal reaches.

In addition, the ground operation rotation type SAR device may further include a control unit for adjusting the position of the main arm or the secondary arm to correspond to the elevation information of the ground on the ROI where the radar signal reaches.

The controller may control the distance between the antenna and the ground of the ROI that the radar signal reaches when the auxiliary arm rotates.

In addition, the ground operation rotation type SAR device may further include a sensor unit for obtaining the height information of the ground portion on the ROI that the radar signal reaches when the auxiliary arm is rotated.

In addition, the ground operation rotary SAR device may be further connected to the control unit, and may further include a DB unit for storing the elevation information of the ground in advance.

According to the ground-operated rotary SAR device according to the present invention, the structure is simple by arranging a rotatable auxiliary arm on one end of the main arm spaced from the ground and installing an antenna for ground detection on the end of the auxiliary arm. It is convenient to move and operate.

1 is a schematic configuration diagram of a ground operation rotary SAR device according to an embodiment of the present invention.
2 is a conceptual diagram illustrating the apparatus of FIG. 1.
Figure 3 shows the simulation results of the radar signal generation and SAR apparatus using the FDTD technique in an embodiment of the present invention.
Figure 4 shows the target setting process for the appearance and performance measurement of the self-produced ground operation rotary SAR test apparatus according to the present invention.
FIG. 5 is a result of analyzing a distance direction signal of a time domain with respect to a single target in order to confirm the operation characteristic of FIG. 4.
FIG. 6 illustrates a SAR image of a single target as an experimental result for comparing distortion degree and efficiency of an image when generating a SAR image applying (x, y) coordinates and (R g , φ) coordinates in the embodiment of FIG. 4. .
FIG. 7 illustrates SAR images of multiple targets using FIG. 4.
8 is a result of comparing the SAR image and the resolution in the test area by setting the bandwidth in the embodiment of FIG.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

1 is a schematic configuration diagram of a ground operation rotary SAR device according to an embodiment of the present invention. The ground operation rotating SAR device 100 includes a main arm 110, an auxiliary arm 120, and an antenna 130.

One end of the main arm 110 is spaced apart from the ground. In the case of FIG. 1, the lower part of the main arm 110 is supported by the support 140 and one end of the upper part is spaced apart from the ground. This is a configuration of the main arm 110 installed upward from the ground as an embodiment, the present invention is not necessarily limited thereto.

That is, the main arm 110 may be applied regardless of the configuration that is installed away from the ground. As an example, it is obvious that the form in which the main arm 110 is mounted near the ground such as a satellite or a vehicle is also included in the technical category of the present invention.

The auxiliary arm 120 is connected to one end of the main arm 110 and extends to the other side, and is rotatable in a horizontal direction based on one end of the main arm 110. In the case of Figure 1, the auxiliary arm 120 includes its body and an arm portion 121 extending outwardly from the body. Of course, the shape of the auxiliary arm may be composed of only the arm portion 121 without the body. That is, the auxiliary arm may be formed in a form in which the arm 121 is directly connected to one end of the main arm 110. Hereinafter, for convenience of description, a configuration including the arm part 121 in the main body will be collectively referred to as an auxiliary arm. The configuration of the auxiliary arm 120 is not necessarily limited to the drawings.

The antenna 130 is connected to the other extended portion of the auxiliary arm 120 to adjust the vertical height, and detects the ground target using the radar signal. The antenna 130 is disposed in a state inclined toward the ground of the lower outer portion at a predetermined angle to transmit the radar signal at the angle, and then receives the signal reflected from the target. That is, a region in which a radar signal is transmitted corresponds to an outer portion of the rotation radius of the auxiliary arm 120. When the auxiliary arm 120 is rotatable by 360 °, the radar reaching region surrounds the outer portion of the rotation radius. Take form.

The ground operation rotating SAR apparatus 100 of FIG. 1 installs an auxiliary arm 120 in the head of the main arm 110 instead of the existing rail system in order to minimize installation and operating space, and has an auxiliary length of 1.6m. The measurement antenna 130 is fixed to the end of the arm 120, and corresponds to the embodiment configured to perform a horizontal rotational movement at about 1-6 m from the ground. Of course, the rotation radius of the secondary arm 120 corresponds to 1.6m.

The antenna 130 is moved along the arc by the auxiliary arm 120. This configuration has the effect of replacing the existing rail system installed on the ground to move the test SAR system, thereby dramatically reducing the system operating space without the need for rails at all and increasing the ease of movement of the measurement system. The antenna 130 may include two transmit / receive ridged-horn antennas. In this embodiment, the antenna of the C-band band will be described as an example.

The analyzer 150 placed on the support 140 is a network analyzer for processing transmission and reception signals of the C-band, and may be configured as a dedicated graphical user interface (GUI) program for system operation and data processing. An example of such an analyzer 150 is the 8753E model from Agilent.

FIG. 2 is a conceptual diagram illustrating the apparatus of FIG. 1. Referring to FIG. 2, an image restoring region using a conventional SAR apparatus using a straight rail (see dotted line region), and an image restoring region using a rotating SAR apparatus 100 according to the present invention (solid region shading region) Can be compared with each other. In addition, through FIG. 2, the linear movement trajectory (-·-·) of the antenna installed on the existing linear rail and the arc-shaped movement trajectory (----) of the rotatable antenna 130 according to the present invention are mutually different. Can be compared.

The movement trajectory of the existing SAR device is difficult to synthesize a wide aperture due to spatial constraints and movement problems in the test area, and undergoes an image generation process using a relatively narrow synthetic aperture.

In this case, the present invention obtains the composite aperture by rotating the antenna 130 mounted on the auxiliary arm (R 0 = 1.6m) in the horizontal direction along the trajectory of the arc in order to obtain the composite aperture of the same moving distance. According to the movement trajectory of the circular arc, it is configured to observe the outside, not the inside of the concentric circle.

According to this, the image reconstruction area according to the present invention has a donut shape unlike the existing rectangular shape. The image reconstruction area target portion of FIG. 2 takes a portion of the donut shape and has an approximately fan shape.

The ground operation rotating SAR apparatus 100 has a configuration of a controller (not shown), a sensor unit (not shown), and a DB unit (not shown) in order to improve the accuracy and reliability of the detected image.

The controller may adjust the vertical angle of the antenna 130 to correspond to the height information of the ground on the ROI where the radar signal of the antenna 130 arrives. For example, when the ground height is low at the current rotation angle of the auxiliary arm 120, the angle of the antenna 130 is moved downward so as to correspond to the distance between the ground and the antenna 130 with respect to the entire rotation direction. You can keep it constant.

Of course, in addition to directly adjusting the angle of the antenna 130, the controller adjusts the position of the main arm 110 or the auxiliary arm 120 to correspond to the height information of the ground on the ROI where the radar signal arrives. Can be. When the position of the main arm 110 or the auxiliary arm 120 is adjusted in the up and down direction, the position of the antenna 130 may also be adjusted.

As described above, the controller controls the angle of the antenna 130, the position of the main arm 110, or the position of the auxiliary arm 120 when the auxiliary arm 120 is rotated, so that the ground and the antenna corresponding to the region of interest ( 130) serves to control the separation distance (corresponding to R in FIG. 1) is always constant at every 360 ° rotational angle change of the secondary arm.

According to this, since R is always kept constant with respect to the rotational angle of the auxiliary arm 120, undistorted radar data can be obtained for the entire rotational direction, thereby reducing an error rate when restoring an image and simplifying the image processing process. There is an advantage. In addition, the size and shape of the fan-shaped region as shown in FIG. 2 may be kept constant at all times, and the probability of error may be greatly reduced when the image is restored.

The sensor unit assists the controller, and when the auxiliary arm 120 rotates, the sensor unit obtains the height information of the corresponding ground portion on the ROI where the radar signal reaches and transmits the height information to the controller. When the auxiliary arm 120 rotates, the ground position at which the actual radar signal is reached is changed, and the height of all the grounds is highly unlikely to be uniform. Therefore, the sensor unit senses the height information for each point of the ground when the auxiliary arm 120 rotates and transmits the height information to the controller. Here, the sensor unit may be embedded in the device 100 of the present invention, or may be installed outside the device 100 to be wired or wirelessly connected.

In addition, the DB unit is a part which stores the height information of the ground in advance. The DB unit is connected to the control unit, the control unit checks the height information of the ground received from the sensor unit in the DB unit, the angle of the antenna 130, the main arm 110 or the auxiliary arm 120 to correspond to the confirmed content At least one of the position can be adjusted.

Hereinafter, a signal model using a conventional SAR device 100 and a signal model using the rotating SAR device 100 according to the present invention will be described with reference to the conceptual diagram of FIG. 2.

First, Equation 1 below illustrates a SAR signal model using a conventional SAR apparatus in FIG.

Figure 112011101339317-pat00001

Here, s (t, u) is a SAR signal model using a conventional SAR device. f (x, y) is the target function of the target (target) on any (x, y) coordinate, p (t) is the transmission pulse, t is the fast-time of propagation, Zc is the height of the antenna, u is the slow-time antenna position, and c is the speed of light.

Equation 2 and Equation 3 are shown by formulating the SAR signal model according to the rotary SAR device 100 of the present invention in FIG.

Figure 112011101339317-pat00002

Figure 112011101339317-pat00003

Here, some elements of Equations 2 and 3 are defined by Equation 4 below.

Figure 112011101339317-pat00004

Where θ is the angle of incidence of radio waves and φ is the angle of rotation of the antenna.

Equations 2 and 3 are formulated as signal models in a time (t) region and a frequency (ω) region, respectively, and the antenna position function u i of Equation 1 is the radius of rotation and the angle of rotation (φ). i ) In addition, the rotation radius of the antenna may be represented by R 0 , and the position from the rotation center to the target (target) may be represented by R g .

The analyzer 150 generates an image by using the radar signal s (t, φ) obtained from the rotatable SAR device 100. In this embodiment, a TDC (Time Domain Correlation) algorithm, which is widely known as a back projection technique, is applied to generate an image.

Equation 5 below formulates a process of obtaining correlation between a matched filter and a target at the ij-th position in the time domain.

Figure 112011101339317-pat00005

Equation 6 below is a modification of Equation 5 into the frequency domain.

Figure 112011101339317-pat00006

Some elements of Equations 5 and 6 are defined as Equation 7 below.

Figure 112011101339317-pat00007

Therefore, it is possible to generate a SAR image from both the time domain or frequency domain signal from the rotating SAR device 100.

In the following, the results of the simulation using the finite difference time domain (FDTD) numerical analysis method for verifying the image generation according to the ground operation rotary SAR device 100 according to the present invention.

Simulation results of the rotating SAR apparatus 100 manufactured for testing in the present invention was compared with the conventional SAR apparatus under the same conditions, and physically near-zone (1 × 1m 2 ) in the numerical analysis area for efficient simulation. It is set up as a small area. Simulation of SAR image generation generally uses FDTD technique using the well-known Yee's algorithm, and three targets within the area of 1 × 1m 2 considering the analysis time and SAR image reconstruction time for radar signal generation A simulation was constructed to identify.

Figure 3 shows the simulation results of the radar signal generation and SAR apparatus using the FDTD technique in an embodiment of the present invention.

FIG. 3 (a) shows the analysis area and setting of the FDTD method for the simulation of the SAR device. The analysis area consists of 101 cells in the x- and y-axis directions, and three metal targets were placed inside the analysis area. The outermost surface of the analysis region was set as the absorbing boundary to minimize the reflected waves at the boundary surface. The transmitting unit of the antenna 130 moves along the trajectory indicated by the lower dotted line (: rotational (invention), ○: linear trajectory (existing configuration)).

At this time, in order to receive the signal reflected from the target, the receiver of the antenna 130 is located in a cell adjacent to the transmitter and moved along the movement trajectory of the transmitter to simulate a monostatic SAR system. In addition, a bistatic system that fixes the transmitting portion of the antenna 130 and moves only the receiving portion is possible, but considering the operational efficiency of the system in the present invention, the SAR test system of the present invention is limited to the monostatic system to show the test results.

3 (b) and 3 (c) show simulation results of the SAR apparatus having the conventional linear trajectory scheme and the rotary trajectory of the present invention, respectively, and the three targets are located at positions coinciding with Fig. 3 (a). It can be seen that each exists.

3 (d) shows a transmission pulse and a reception signal used in the simulation. The transmission pulse p (t) uses Gaussian pulse and the pulse width is 50 time-steps (~ 16.6 psec / time-step). Considering the round trip time to the target, the maximum time was set to 800 time-steps. s (t, u) represents a signal reflected from the target, and s w (t, u) is a signal obtained by removing a signal directly transmitted from the transmitter from the received signal using a rectangular window. At this time, it can be seen that the magnitude of the received signal transmitted directly from the transmitter is much larger than the signal reflected from the target.

3 (e) and 3 (f) show received signals sw (t, u) and s w (t, φ) reflected from three targets using the FDTD, respectively. raw data). That is, (e) represents the received signal s w (t, u) of the conventional linear locus type SAR device, and (f) represents the received signal s w (t, φ) of the SAR device having the rotary locus of the present invention. ).

In practice, the rotating SAR test apparatus designed and manufactured for the experiment is a system based on the network analyzer 150, which uses a separate transmit / receive antenna 130 to reduce signal processing complexity for separating transmit / receive signals in time domain. Lowered. In addition, the measurement antenna 130 uses a ridged-horn antenna (BBHA 9120D) having broadband characteristics to apply a bandwidth of 2GHz or more at a center frequency of 5GHz (HPBW E-51.7 ° / H-35.8 °) to the rotating SAR device. It was.

Figure 4 shows the target setting process for the appearance and performance measurement of the self-produced ground operation rotary SAR test apparatus according to the present invention. Figure 4 (a) is the outer appearance of the self-produced ground operation rotating SAR test apparatus, the separation distance between the transmitting antenna and the receiving antenna is 45cm, the radius of rotation of the auxiliary arm 120 is up to 1.6m. In addition, the height of the antenna 130 can maintain the posture up to a maximum height of 6m using the support (140, 8m). Indoor and outdoor measurements were performed simultaneously to analyze the system operation characteristics, and various experiments were conducted to analyze the changes in the characteristics of major system settings and SAR image generation. 4 (b) shows an example of setting a target for performance analysis.

As a basic setting for system performance analysis, the antenna height was 1.3m, the radius of rotation was 1m, the center frequency was 5GHz, the bandwidth was up to 2GHz, and the angle of rotation (φ) was set at ± 10 ~ 20 ° with 1 ° intervals. At this time, a triangular radio reflector (10/20 / 30cm), a metal ball (diameter 30cm), and the like were used as test targets.

FIG. 5 is a result of analyzing a distance direction signal of a time domain with respect to a single target in order to confirm the operation characteristic of FIG. 4.

Referring to this, there is an antenna at 23nsec point, and the interference effect of the transmit / receive antenna can be checked at 25.3nsec point. The test target at 33.25 nsec is using a triangular radio reflector with a size of 30 cm. The time delay effect in the right part is caused by a 3m cable (3m × 2 / c (beam) = 20nsec) and accessories between the network analyzer 150 and the measuring antenna 130. The net propagation distance minus must be taken into account.

FIG. 6 illustrates an experimental result for comparing distortion degree and efficiency of an image when generating an SAR image by applying (x, y) coordinates and (R g , φ) coordinates in the embodiment of FIG. 4.

6 is a result of measuring a single target in the test area of the 5m range through the previous system configuration. For SAR image generation using coordinate transformation, the position of the ij-th pixel (x i , y j ) in the SAR image is transformed into (R gi , φ j ) in Equation 8 to form a fan-shaped image as shown in Equation 8. Generated.

Figure 112011101339317-pat00008

Due to the operational limitations of creating a relatively larger area image using a limited synthetic aperture, the antenna beam spreads as the distance of the target increases due to the characteristics of the ground operation SAR system. It means more efficient.

FIG. 7 illustrates SAR images of multiple targets using FIG. 4. FIG. 7A illustrates the relative synthesized power of the generated SAR image for each pixel. 7 (b) and 7 (c) show a change in the range of synthesized power suitable for identifying a target. That is, Fig. 7B shows a SAR image set in a low range of -30dB to 10dB, and (C) in a high range of -10dB to 20dB. Referring to FIG. 7, it can be seen that the degree of identification of the target in the image may vary depending on the range in which the same figure is expressed.

8 is a result of comparing the SAR image and the resolution in the test area by setting the bandwidth in the embodiment of FIG. (A) of FIG. 8 shows target setting for outdoor measurement, and (b) to (d) show SAR images set to 2 GHz, 1 GHz and 0.5 GHz, respectively.

In the case of the second target (20 cm CR) at 4 m, the result of the 0.5 GHz bandwidth is compared with the result of the 2 GHz bandwidth. In addition, the third target (CR 10cm) of the 3m point can be seen that the background and identification is difficult when applying the 0.5GHz bandwidth.

As described above, in the present invention, the SAR image generation result was examined using the ground-operated rotary SAR test apparatus for various electromagnetic wave scattering studies, and it was possible to verify that the identification of the target was possible through comparison with the existing SAR apparatus. In addition, the embodiment of the present invention is configured to generate a wide-band (UWB) signal and a secondary arm 120 (1.6m) in the C-band (f0 = 5GHz, BW = up to 2GHz) band using a broadband antenna and a network analyzer By applying the configuration, the use band can be further expanded, of course. In addition, the ground-operated rotary SAR device 100 is possible to build a new SAR system model that is easy to move and operate by obtaining a SAR image in a limited platform to replace the existing rail system.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: ground operation rotary SAR device
110: main arm 120: auxiliary arm
121: female 130: antenna
140: support 150: analyzer

Claims (6)

  1. A main arm having one end spaced apart from the ground;
    An auxiliary arm connected to one end of the main arm and extending to the other side and rotatable in a horizontal direction with respect to the one end;
    An antenna connected to the other extended portion of the auxiliary arm to adjust vertical height and detecting a target on the ground by using a radar signal; And
    And a control unit for controlling the distance between the antenna and the ground of the ROI that the radar signal reaches when the auxiliary arm rotates.
  2. The method according to claim 1,
    The control unit,
    And ground-level rotating SAR device for adjusting the vertical angle of the antenna so as to correspond to the height information of the ground on the ROI where the radar signal arrives.
  3. The method according to claim 1,
    The control unit,
    And a ground operation rotating SAR apparatus for adjusting the position of the main arm or the secondary arm so as to correspond to the elevation information of the ground on the ROI where the radar signal arrives.
  4. delete
  5. The method according to claim 2 or 3,
    And a sensor unit configured to acquire height information of the ground portion on the ROI where the radar signal arrives when the auxiliary arm rotates.
  6. The method according to claim 2 or 3,
    Ground operation rotary SAR device is connected to the control unit, further comprising a DB unit for storing the elevation information of the ground in advance.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101858583B1 (en) * 2017-10-11 2018-05-16 엘아이지넥스원 주식회사 Multi-Target Tracking Method using Millimeter Wave Seeker and IIR Image Seeker and Recording Medium Storing Computer Program thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0142668B1 (en) * 1989-07-05 1998-08-17 게르하르트 프릭 Radar apparatus with an artificial aperture on the base of a rotary antenna
KR101046915B1 (en) 2011-03-18 2011-07-07 국방과학연구소 Examining radome boresight error correction

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0142668B1 (en) * 1989-07-05 1998-08-17 게르하르트 프릭 Radar apparatus with an artificial aperture on the base of a rotary antenna
KR101046915B1 (en) 2011-03-18 2011-07-07 국방과학연구소 Examining radome boresight error correction

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
지상 운용 회전형 SAR 시험용 시스템 연구(한국전자파학회논문지, 2011년 11월, 제22권 제11호, pp 1092~ 1099) *
지상 운용 회전형 SAR 시험용 시스템 연구(한국전자파학회논문지, 2011년 11월, 제22권 제11호, pp 1092~ 1099)*

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101858583B1 (en) * 2017-10-11 2018-05-16 엘아이지넥스원 주식회사 Multi-Target Tracking Method using Millimeter Wave Seeker and IIR Image Seeker and Recording Medium Storing Computer Program thereof

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