Min-Nyun Kim

An Analysis of Direction Finding Accuracy of ELINT System

The technology of direction finding is very important to find the direction of emitters for ELINT(electronic intelligence) system. The principle of TDOA(time difference of arrival) is to receive an emitter signal with two antennas, measure the time difference between two antennas, and converse the time difference to direction difference. This technology can be used in broadband frequency system and make the system very simple because a phase-discriminator and a voltage comparator are not needed. For fine DF accuracy, high time resolution receiver and long basis line antennas are needed. The DF accuracy of noise added signals is simulated with different time

Novel S-DMB antenna design using modified QHA

A small QHA antenna for S-DMB (satellite digital multimedia broadcasting) is presented. The proposed antenna is based on the general QHA and modified the helix structure to improve the performance. According to our simulation results, a prototype antenna is manufactured and measured. The obtained antennas operate in S-DMB band (2.63 - 2.635 GHz) and can be adopted for various potable applications.

A small meander line antenna for T-DMB applications

A small meander line antenna for T-DMB (Terrestrial Digital Multimedia Broadcasting) is presented. The antenna proposed here is based on a typical planar meander line antenna and miniaturized by using a double-sided structure. A prototype antenna is manufactured based on the simulation results and the basic performances are measured. The presented antenna is designed within a dimension of 30×14mm and can be adopted for various mobile applications.

An anti-ARM technique using decoy antennas

This paper describes an anti-ARM technique using multiple decoy antennas. We investigate the radar and decoy antenna signal received at the ARM receiver to verify the effect of decoy antennas. And we develop a simulation program using Matlab for optimum positions of the decoys and the effect of ARM by distance between decoys. We suggest optimum positions and distance between decoys based on our simulation results.

A Novel QHA for S-DMB Applications

A novel QHA (Quadrifilar helix antenna) for S-DMB (Satellite Digital Multimedia Broadcasting) is presented. The antenna proposed here is based on the general QHA and modified the feeding structure to simplify for manufacturing procedures. A prototype antenna is built based on the simulation results and the basic performances are measured. The presented antenna operates in S-DMB band (2630-2655 MHz) and can be adopted for various mobile applications.

An analysis of the effectiveness for an anti-ARM technique using decoy antennas

This paper describes an analysis of the effectiveness for an anti-ARM technique to protect a radar system. We investigate the optimum deployment of decoy antennas which are widely using for anti-ARM and the electromagnetic field at the ARM receiver. To verify the effect of decoy antennas, we analyze the field intensity and phase at the receiver and develop a numerical simulation program using Matlab. We conduct an analysis of ARM attack in case of using multiple decoy antennas and these results can be used to decide the optimum positions of the decoys for anti-ARM.

Development of an electronic protection simulator using decoy antenna

Abstract This paper describes on a software simulator that can be used for an anti-ARM system. The proposed simulator is a valuable tool for investigating the optimum deployment of decoy antennas which are widely using for anti-ARM and calculating the electromagnetic field at the ARM receiver. To verify the effect of decoy antennas, we analyze the field intensity and phase at the receiver. We conduct an analysis of ARM attack in case of using multiple decoy antennas and the proposed simulator can be used to decide the optimum positions of the decoys. Key Words : Decoy antenna, ARM, Anti-ARM, Radar, Simulator * 교신저자 : 채규수(gschae@bu.ac.kr)접수일 09년 12월 21일 수정일 10년 04월 30일 게재확정일 10년 07월 06일 1. 서론 현대전에서는 적의 대공방어망을 억제하기위한 정밀 유도무기, 대방사미사일에 의한 공격이 급격히 증대되고 있다. 전파방해 전용 무인기가 등장하면서 레이다를 보호하기 위한 전파회피 기술과 수치해석에 관한 연구가 활발하게 진행되고 있다[1-6]. 전파회피기술은 한반도와 같은 산악지형에서 최적의 레이다 운용 사이트를 선정하고 다른 발생신호 장치를 추가하여 레이다에서 발생되는 전파를 효율적으로 관리함으로써 (Blinking) 레이다 운용을 적에게 최소로 노출시켜 ARM 등의 공격을 피하면서 원하는 정보를 충분히 획득할 수 있도록 하는 기술이다. 대방사미사일은 공대지, 지대지, 함대지 미사일 형태가 있으며 미국이나 유럽에서 사용하는 미사일의 직경은 최대 40cm 정도이고, 러시아에 의해서 개발된 ARM 미사일의 직경은 최대 직경은 약 1m 이다. ARM은 능동형 미사일의 탄두에 부착되는 탐색기 대신에 적의 레이다에서 발사되는 전파를 수신하는 전자전 장비의 방향탐지기와 유사한 수동형 레이다 추적기를 보유하고 있다. 현재 사용되는 대부분의 레이다 추적기는 수동형 방향 추적기로 전자지원 장비의 수신기 및 방탐기와 구성 및 기능이 유사하다.ARM을 방어하는 기술은 직접타격(Hard kill), 채프(Chaff), 디코이 안테나, 디코이 안테나와 블링킹병행, 레이다 파라메타 변경 등이 있으며 이중에서도 디코이 안테나를 사용하는 기법과 블링킹 기법이 매우 효과적인 것으로 알려져 있다[7-10]. 이러한 전파회피 기술들이 선진국들의 국방관련 기술로 소개되었지만 디코이 안테나의 배치에 대한 이론적인 모델은 제시되지

Simulation Study on the Multipath Tracking Errors

This paper describes the radar tracking errors due to the presence of surface reflected waves. We investigate the previous studies on tracking errors and developed a tracking error estimation program using Matlab. We suggest an accurate error prediction method by considering the antenna beamwidth and surface reflection coefficient. The presented results well agree with theoretical predictions.

A Chaff Simulator for an Aircraft

This paper presents a simulator developed for effective use of chaff which is widely employing for aircraft protection. We calculate the scattered electric field based on the aircraft and the chaff RCS. Input parameters calculated using Matlab are forwarded to the input module of the presented simulator which provides a three dimensional display fur the three different scenarios.

A Study on the Dipole Chaff RCS for Aircraft

In this paper, the computation of electromagnetic wave scattering is presented for chaff clouds which is widely used to protect an aircraft. The RCS depends on the wind, the aircraft velocity, and the atmospheric diffusion. It is assumed that the RF chaff is a thin dipole antenna and the RCS is calculated based on the scattering wave theory. The theoretical estimation and the simulation results are compared and shown a good agreement.