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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of Korean Institute of Electromagnetic Engineering and Science
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The Korean Institute of Electromagnetic Engineering and Science
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Volume & Issues
Volume 27, Issue 8 - Sep 2016
Volume 27, Issue 7 - Aug 2016
Volume 27, Issue 6 - Jul 2016
Volume 27, Issue 5 - Jun 2016
Volume 27, Issue 4 - Apr 2016
Volume 27, Issue 3 - Mar 2016
Volume 27, Issue 2 - Feb 2016
Volume 27, Issue 1 - Jan 2016
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Experimental Verification of Electromagnetic Cloak Based on Quasi-Conformal Mapping
Kim, Yongjune ; Seo, Ilsung ; Koh, Il-Suek ; Lee, Yongshik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 6, 2016, Pages 491~494
DOI : 10.5515/KJKIEES.2016.27.6.491
A design method is proposed to minimize the scattering cross section(SCS) of the electromagnetic cloak based on the quasi-conformal mapping. Often times in such cloaking structures, parts that require refractive index below one are approximated with free space because of the difficulty involved with realization. In this process, preformance degradation is inevitable. In this work, the size of the cloak is optimized to compensate for the deterioration, and thus to minimize the scattering cross section of a diamond shaped conductor. Proposed cloak is fabricated using a 3D printer, and verified by measuring the cloaking performance of a diamond shaped aluminum target.
Design of Multiband Repeater Antenna with Fire-Fighting Band for In-Building Mobile Communication
Kim, Sung-Min ; Min, Kyeong-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 6, 2016, Pages 495~503
DOI : 10.5515/KJKIEES.2016.27.6.495
This paper proposes the design of multiband repeater antenna with fire-fighting band for in-building mobile communication. The proposed antenna is composed of a center monopole and 4 parasitic elements on a circular plate. In order to realize good reflection coefficients at the multiband, mutual coupling between 4 parasitic elements and center monopole antenna is considered. The important parameters such as distance between parasitic element and a center monopole, and each height of a center monopole and 4 parasitic elements are simulated to obtain good antenna characteristics at the multiband. The diameter of 4 parasitic elements and a center monopole was fixed to 10 mm for easy design and manufacturing. The measurement results of reflection coefficients, 2-D patterns and gain agreed well with their simulation ones.
Near-Field Rx-Measurement for Active Phased Array of Digital Radar Using Calibration Path
Yu, Je-Woo ; Chae, Heeduck ; Park, Jongkuk ; Lim, Jae-Hwan ; Kim, Duckhwan ; Jin, Hyoung-Seog ; Kim, Han-Saeng ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 6, 2016, Pages 504~511
DOI : 10.5515/KJKIEES.2016.27.6.504
In this paper, the method is proposed that the equivalent result can be obtained by compensating the variation of gain and phase in the comparison with the result of near-field measurement which is obtained in the steady state, although the gain and phase variation of rx-channels occurred in the near-field rx-measurement of digital active phased array antenna. The proposed concept has the time section for monitoring the state of the rx-channels through the calibration path in the measurement timeline, and is the method for compensating the variation of state. For validating the proposed method, the fabricated X-band digital active phased array antenna and the planar near-field measurement facility is utilized. The proposed method is validated in the comparison with the compensated pattern which the unstable state of rx-channels is calibrated and the reference pattern obtained under the steady state of the rx-channels.
Miniaturized Frequency Selective Surface with a Scalability of Operating Frequency
Lee, In-Gon ; Hong, Ic-Pyo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 6, 2016, Pages 512~520
DOI : 10.5515/KJKIEES.2016.27.6.512
In this paper, a miniaturized frequency selective surface(FSS) for bandstop operation that provides stability for an angle of incidence and polarization is presented. The proposed miniaturized FSS has the unit cell of hexagonal structure with triangular loops and size of the unit cell is
at 2.5 GHz operating frequency, which is very small compared to operating wavelength. In addition, unlike the conventional design, which requires complicated design parameters, the proposed FSS is easily expanded to the desired operating frequency for 2~8 GHz, by controlling the specific design parameters. To validate the simulation results, the FSS structures having different operating frequencies, 2.5 GHz, 5 GHz and 8.2 GHz were designed, fabricated and measured. The comparisons between the simulation and the measured results show good agreement. The proposed miniaturized FSS can provide better frequency stability for different incidence angles and polarizations.
Development of Unfolding Radial Velocity Algorithm for Dual PRF Mode of Yong-In Testbed(YIT) Radar
Kim, Hye-Ri ; Suk, Mi-Kyung ; Nam, Kyung-Yeub ; Ko, Jeong-Seok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 6, 2016, Pages 521~530
DOI : 10.5515/KJKIEES.2016.27.6.521
Weather radar is observation equipment that transmits electromagnetic waves and receives backscattered signals from the targets. The weather radar systems of the Korea Meteorological Administration have a doppler mode that can extract the target`s radial velocity. However, the radial velocity over the maximum unambiguous velocity(
) for which is in a trade-off relationship with the maximum unambiguous range is folded. Therefore, a dual PRF mode of which transmits and receives signals using two different PRFs(high and low) must be used to extend the vm while maintaining the maximum unambiguous range. Using a dual PRF mode, vm can be extended to the amount of lowest common denominator of two observed vm from high and low PRF. For this extension, we have developed a velocity unfolding algorithm of which uses several criteria for classification considering observed velocity differences between high and low PRF and their error boundary. Then, correction factors are calculated for each class and are applied to unfold radial velocity. The developed algorithm was applied to the Yong-In Testbed(YIT) radar and the generated better performance of radial velocity extraction than those of the previous system.
Two-Dimensional Short Range FMCW Radar Using Dual Transceiver Modules
Seo, Won-Gu ; Kim, Dong-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 6, 2016, Pages 531~538
DOI : 10.5515/KJKIEES.2016.27.6.531
In this paper, we design and fabricate a short range FMCW radar which detects and tracks a moving target in a two-dimensional domain using dual transceiver modules. For the short range radar, we propose a scheme for alternate extraction of the two-dimensional positions using one-dimensional range information from time division transceiver modules, and successfully apply the scheme to the two-dimensional short range radar. Measured results of the targets at 10 m and 30 m are presented as performance demonstration of each transceiver module. Also the performance of the two-dimensional radar is demonstrated using a two-dimensional target map, which uses the range bin corresponding to the frequency resolution, and the effectiveness of the proposed scheme is validated.
Two Unresolved Target Angle Estimation in Phase Comparison Monopulse Radar
Lee, Seung-Phil ; Cho, Byung-Lae ; Kim, Young-Soo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 6, 2016, Pages 539~544
DOI : 10.5515/KJKIEES.2016.27.6.539
This paper improves Sherman`s two-pulse method for angle estimation of two unresolved targets in phase comparison monopulse radar. The proposed method provides the angle information with only a single-pulse measurement instead of two pulses. The proposed method can estimate a single-target angle by single-target indicator, in contrast with previous techniques. The accuracy of angle estimation for proposed method is demonstrated by simulations.
JPDAS Multi-Target Tracking Algorithm for Cluster Bombs Tracking
Kim, Hyoung-Rae ; Chun, Joo-Hwan ; Ryu, Chung-Ho ; Yoo, Seung-Oh ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 6, 2016, Pages 545~556
DOI : 10.5515/KJKIEES.2016.27.6.545
JPDAF is a method of updating target`s state estimation by using posterior probability that measurements are originated from existing target in multi-target tracking. In this paper, we propose a multi-target tracking algorithm for falling cluster bombs separated from a mother bomb based on JPDAS method which is obtained by applying fixed-interval smoothing technique to JPDAF. The performance of JPDAF and JPDAS multi-target tracking algorithm is compared by observing the average of the difference between targets` state estimations obtained from 100 independent executions of two algorithms and targets` true states. Based on this, results of simulations for a radar tracking problem that show proposed JPDAS has better tracking performance than JPDAF is presented.
An Efficient Method to Extract the Micro-Motion Parameter of the Missile Using the Time-Frequency Image
Choi, In-O ; Kim, Si-Ho ; Jung, Joo-Ho ; Kim, Kyung-Tae ; Park, Sang-Hong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 6, 2016, Pages 557~565
DOI : 10.5515/KJKIEES.2016.27.6.557
It is very difficult to intercept the missiles because of the small radar cross-section and the high maneuverability. In addition, due to the decoy with the similar motion parameters, additional features other than those of the translation motion parameters need to be developed. In this paper, for the successful recognition of missiles, we propose an efficient method to extract micro-motion parameters and scatterers of the missile engaged in the micro motion. The proposed method extracts motion parameters and scatterers by using the matching score between the modeled micro-Doppler function and the time-frequency binary image as a cost function. Simulation results using a target composed of the point scatterer show the parameters and the scatterers were accurately extracted.
Analysis of Target Identification Performances Using Bistatic ISAR Images
Lee, Seung-Jae ; Lee, Seong-Hyeon ; Kang, Min-Seok ; Yang, Eunjung ; Kim, Kyung-Tae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 6, 2016, Pages 566~576
DOI : 10.5515/KJKIEES.2016.27.6.566
Inverse synthetic aperture radar(ISAR) image generated from bistatic radar(Bi-ISAR) represents two-dimensional scattering distribution of a target, and the Bi-ISAR can be used for bistatic target identification. However, Bi-ISAR has large variability in scattering mechanisms depending on bistatic configurations and do not represent exact range-Doppler information of a target due to inherent distortion. Thus, an efficient training DB construction is the most important factor in target identification using Bi-ISARs. Recently, a database construction method based on realistic flight scenarios of a target, which provides a reliable identification performance for the monostatic target identification, was applied to target identification using high resolution range profiles(HRRPs) generated from bistatic radar(Bi-HRRPs), to construct efficient training DB under bistatic configurations. Consequently, high identification performance was achieved using only small amount of training Bi-HRRPs, when the target is a considerable distance away from the bistatic radar. Thus, flight scenarios based training DB construction is applied to target identification using Bi-ISARs. Then, the capability and efficiency of the method is analyzed.
Required Performance Analysis of Wavefront Distortion System against Monopulse Radar
Jang, Yeonsoo ; Kim, Ghiback ; Park, Jintae ; Lee, Changhoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 6, 2016, Pages 577~580
DOI : 10.5515/KJKIEES.2016.27.6.577
One of the effective jamming methods to disturb monopulse radars is a wavefront distortion. Most well-known wavefront distortion is the cross eye technique which uses two transmitters. The cross eye can make angle error regardless of monopulse radar structure but high accuracies of phase and amplitude between two transmitters should be needed to make large angle error. Thus, the accuracies of phase and amplitude are essentially required performance parameters for implementation of wavefront distortion systems and the required values of accuracy is dependant on amount of angle error. In this paper, we derive expressions for minimum required values of phase difference and amplitude ratio according to amount of angle error and analyze the results.