• Defense and Technology
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• no.6 s.232
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• pp.42-59
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• 1998

이제까지 레이다 시스템 기술과 레이다와 직간접으로 관련된 기술에 대한 발전방향과 동향에 대해 알아보기 위해 레이다의 발달 배경과 발전사를 살펴보았다. 또한 레이다가 광범위하게 사용되고 있는 것에 대한 설명과 현재 위상배열레이다의 기술수준을 가늠하기 위한 대표적 모델을 알아보았다. 이번호에서는 위상배열레이다 시스템 및 기술개발 동향에 대해 소개한다.

• Defense and Technology
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• no.5 s.231
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• pp.66-75
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• 1998

이제까지 레이다 시스템 기술과 레이다와 직간접으로 관련된 기술에 대한 발전방향과 동향에 대해 알아보기 위해 레이다의 발달 배경과 발전사를 살펴보았고 또한 레이다가 광범위하게 사용되고 있는 것에 대해 설명하였다. 이번 호에서는 현재 위상배열레이다의 기술수준을 가늠하기 위해 대표적 모델을 소개한다.

• Journal of IKEEE
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• v.21 no.1
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• pp.30-38
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• 2017

It is necessary to check the fault of phased array antenna, when the active phased array radar installed in the site is suspected performance degradation due to external impact or long-term operation. However, the near-field test should be performed in anechoic chamber in order to measure the phased array antenna, so that much time and cost must be applied for radar disassembly and transportation, and the operational availability of the radar system is deteriorates. Therefore, we propose a near-field scanner with mobility to check the fault of the phased array antenna at the site, and the effectiveness of the proposed scanner was verified with ${\pm}0.5dB$ magnitude and ${\pm}1.5^{\circ}$ phase in comparison with measured data in anechoic chamber.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.12
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• pp.2417-2424
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• 2016

Small size and light weight is very important for components used in radar mounted platform such as airborne radar. Recently, the active phased array radar is developed as an array of antennas for thousands of transmit/receive modules to be used as a multi-function radar that can detect and track targets. In this case, the size and weight of the transmit/receive modules are critical factor for developing the radar. In this paper, we developed a compact transmit/receive module using the 10W RF MEMS switch domestically localizing and reduced the circuit area to about 86.5% compared to using a circulator. The developed module satisfies not only electrical requirements but also MIL-STD's environmental specifications. So it can be used in a military device. It can be used at adaptive tunable receivers, reconfigurable smart active antennas and wide band beam electrical steering antennas.

• Journal of IKEEE
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• v.25 no.4
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• pp.703-709
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• 2021

As drone technology advances, the risks of drones are increasing, then technology to detect drones is becoming important. In this thesis, it was verified that miniaturized and lightweighted active array antenna could be used for radar system to detect drones in reality. The transmit-receive module was designed in the form of tile-type to simplify interconnections between devices. The waveform generation module and the down conversion module were miniaturized to include in one body too. As a result of verifing the detection performance through test, it was confirmed that the detection range was over 3.7Km.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.1
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• pp.155-161
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• 2018

Many short range weather radars with the low elevation search capability are needed for analysis and prediction of unusual weather changes or rainfall phenomena which occurs regionally. However, due to the characteristics of low elevation electromagnetic wave beam, it is highly probable that the received weather signals of these radars are contaminated by the ground and sea clutter. Since most of ground clutter appears around the very narrow low Doppler frequency region, it is somewhat easy to separate. However, the sea clutter removal is very difficult since it can occupy the broad Doppler frequency region according to weather conditions. Therefore, in this paper, the sea clutter removal capability is analyzed for a phased array weather radar which use vertical array elements for electronic elevation beam steering. Also, it is shown that the sea clutter removal can be achieved appropriately using the receiver beam forming technology in a phased array antenna.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.30 no.6
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• pp.479-486
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• 2019

The fully digital active array radar uses a wide beam for effective mission performance within a limited time. This paper presents a convex optimization algorithm that adjusts only the phase of an array element. First, the algorithm applies a semidefinite relaxation technique to relax the constraint and convert it to a convex set. Then, the constraint is set so that the amplitude is fixed to some extent and the phase is variable. Finally, the optimization is performed to minimize the sum of the eigenvalues obtained through eigenvalue decomposition. Compared to the application results of the existing genetic algorithm, the proposed algorithm is more effective in wide beam design for a fully digital active array radar.

• Defense and Technology
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• no.4 s.230
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• pp.38-47
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• 1998

레이다는 저고도 표적에 대한 탐지능력 ECCM 능력, 대방사유도탄에 대한 대처능력이 우수해야 하며, 동시다발 표적에 대한 탐지와 추적능력을 보유해야 하고 다기능 및 다목적 용도를 위해서 또는 시시각각으로 변하는 상황에 대처하기 위해서는 시스템의 융통성과 잠재능력이 커야 한다.

• Defense and Technology
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• no.3 s.229
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• pp.30-41
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• 1998

'항공기와 레이다'는 '창과 방패'와 같은 관계처럼 어떤 때는 서로 상대하는 어떤 때는 상호 협동하는 모습으로 늘 같이 존재한다. 기습공격이 동서고금을 망라한 전쟁의 기본양상이라면 현대전에서 공중공격은 가장 빠르고 효과적인 기습작적이었고 앞으로도 그 양상은 계속 변하지 않을 전망이다.

• The Journal of the Korea institute of electronic communication sciences
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• v.13 no.2
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• pp.321-326
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• 2018

This study describes the design and implementation of TRM(Transmit and Receiver Module) for detection for targets of small RCS(Radar Cross Section). Through the pre-simulation analysis of radar system about RF, the main specifications of TRM are verified. After the fabrication of TRM, the main characteristics such as the maximum output, noise figure, spurious were confirmed. In the future, the radar system test will be carried out by assembling TRMs, antenna radiator, and the transceiver that generates and receivers the radar waveform reflected.