THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 3, Mar guidance system: MGS), MGS. MGS, (pulse repetit

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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Mar.; 28(3), ISSN (Print) ISSN X (Online) An Analysis of Spot Noise Jamming Technique in a Monopulse Sensor 이성현 정남훈 최영익 홍상근 오승섭 나인석 이창훈 김경태 Seong-Hyeon Lee Nam-Hoon Jeong Young-Ik Choi* Sang-Guen Hong* Seung-Sup Oh* In-Seok Na* Chang-Hoon Lee** Kyung-Tae Kim 요약, (amplitude comparison monopulse) (monopulse sensor),., (spot noise jamming).,. Abstract In this paper, a monopulse sensor which determines a target location using amplitude-comparison monopulse technique is presented. This sensor can allow the missile to track the target when additional jamming signals are not presented. Then, we applied the spot noise jamming technique to the monopulse sensor. Based on the simulation results, we can effectively figure out the performances of the spot noise jamming technique for the monopulse sensor in various jamming scenarios. Key words: Monopulse Sensor, Spot Noise Jamming, Amplitude Comparison Monopulse. 서론 (monopulse tracking). /. (electronic countermeasure: ECM), (electronic counter countermeasure: ECCM) [1],[2]. ECM (spot noise jamming), (jammer to signal ratio: JSR) (missile. (Department of Electrical and Electronic Engineering, Pohang University of Science and Technology) *LIG (Electronic Warfare R&D Lab., LIG Nex1 Co., Ltd) ** (Agency for Defense Development) Manuscript received February 15, 2017 ; Revised March 13, 2017 ; Accepted March 14, (ID No ) Corresponding Author: Kyung-Tae Kim ( kkt@postech.ac.kr) c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. 237

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 3, Mar. 2017. guidance system: MGS), MGS.

2 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 3, Mar guidance system: MGS), MGS. MGS, (pulse repetition interval: PRI) / (constant false alarm rate: CFAR) [3]. CFAR (amplitude comparison monopulse: ACM)., PRI, [4],[5]. MGS,., MGS.. 유도미사일시스템모델링 MGS. 1. 그림 2. Fig. 2. The sum and difference patterns using four squinted beams. 그림 3. CA-CFAR Fig. 3. The CA-CFAR detector. MGS ACM (sum pattern) (difference pattern) ( 2),., (baseband) (matched filtering) (signal to noise ratio: SNR). (peak), CFAR. 2-1 CFAR 신호탐지및모노펄스각도추정 그림 1. Fig. 1. The signal processor in the MGS. CFAR (cell-averaging CFAR: CA- CFAR). CA-CFAR

3 (training cell) (cell under test) (threshold), (guard cell). CA-CFAR [3]. T = b P n (1) (scaling factor),.. P n Nr 1 = å x N r n = 1 n. (1) (false alarm rate). b = N - -1/ N ( r r Pfa 1),. CFAR., - (sum- difference ratio), [1]. 1 ìd Re az ü qaz = í ý km î s þ (4) 1 ìd Re el ü qel = í ý km î s þ (5),,,,,. - (2) (3),. k m kdq = s 0 bw (6), (on-axis),,. 2-2 유도미사일의운동궤적모델링 MGS, [4]. MGS., (local orthogonal coordinate( )) (global orthogonal coordinate( ))., =0. (Euler angle: (roll angle, ), (pitch angle, ), (yaw angel, )) ( 4). 6 (six degrees of freedom model: 6-DOF model), [5]. MGS PRI( ), (,, ). D f = P t i (7) æ -1 gt ö i D q = Nqelti - tan ç è Ub ø (8) D y = Nqazti (9),, (6) 239

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 3, Mar. 2017. (a) (a) The spot noise jamming technique (b) (b) The barrage noise jamming technique 그림 5.. Fig.

4 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 3, Mar (a) (a) The spot noise jamming technique (b) (b) The barrage noise jamming technique 그림 5.. Fig. 5. The frequency spectrum of noise jamming technique. 그림 4. MGS 6-DOF Fig. 4. The 6-DOF model in the MGS. g, ( 4 ),.., MGS. 2-3 점잡음재밍신호모델링 MGS.,, (spot noise jamming) (barrage jamming).., ECCM (frequency hopping) ( 5)., (random signal).,, PRI JSR. PJ GJ 4p R JSR = P G s T T 2 (10) (10), (gain),, (radar cross section: RCS). JSR MGS PRI.. 시뮬레이션결과 240

5 . (linear frequency modulation: LFM), Ku band, 5, PRI 0.1 ms, =60 db. ACM (element) , 0.5., CA-CFAR 4 50, 10. MGS ( ) ( 3, 0, 0.5) km 200 m/s,,,., (8), (9) 8. (point scatterer), 10 m/s ( 6)., MGS. 7 8 PRI 그림 6. Fig. 6. The simuluation scenario. (a) (a) The azimuth angle (b) (b) The elevation angle 그림 7. ACM Fig. 7. The estimated angles using ACM technique.., 0. ( 4 ). PRI,. 241

6 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 3, Mar 그림 8. ( :, : ) Fig. 8. The trajectories of the missile and the target(solid line in red: the trajectory of the missile, solid line in green: the trajectory of the target)., ( 10). 9, JSR, 2.4 km. JSR (10) 8.6 db. B, B, ( 11). (a) (a) The azimuth angle 그림 9. JSR( =30 db), ( : JSR, : (10) JSR) Fig. 9. The JSR of the noise jamming signal(solid line in blue: JSR of the noise jamming signal, solid line in red: the theoretical JSR in (10))., =30 db,,. 20 MHz. 9 PRI JSR. A JSR CA-CFAR (b) (b) The elevation angle 그림 10. ACM ( =30 db) Fig. 10. The estimated angles using ACM technique. 242

7 그림 11. ( =30 db), ( :, : ) Fig. 11. The trajectories of the missile and the target(solid line in red: the trajectory of the missile, solid line in green: the trajectory of the target). 그림 12. JSR( =40 db), ( : JSR, : (10) JSR) Fig. 12. The JSR of the noise jamming signal(solid line in blue: JSR of the noise jamming signal, solid line in red: the theoretical JSR in (10))., =40 db., JSR (10) =30 db 10 db ( 12)., JSR (10) JSR. 12 그림 13. ( =40 db), ( :, : ) Fig. 13. The trajectories of the missile and the target(solid line in red: the trajectory of the missile, solid line in green: the trajectory of the target). JSR ( 8.6 db)., PRI, ( 13). JSR,. 8.6 db JSR.. 결론및향후연구방향 ACM MGS,., MGS. 8.6 db JSR. 243

Stimson, Introduction to Airborne Radar 3rd edition, Scitech publishing, Inc., 2014. [3] M. Oommen, S. Lenin, Md. S. Ansari, and S.

Engineering, vol. 3, no. 3, pp. 5665-5669, 2014. [4] R. Das, Advances in Active Radar Seeker Technology, Mc

8 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 3, Mar , ECM MGS. References [1] S. M. Sherman, Monopulse Principles and Techniques, Dedham, MA: Artech House, [2] G. W. Stimson, Introduction to Airborne Radar 3rd edition, Scitech publishing, Inc., [3] M. Oommen, S. Lenin, Md. S. Ansari, and S. Mishra, "An analysis of digital signal processing in monopulse radar", International Journal of Advanced Research in Computer and Communications Engineering, vol. 3, no. 3, pp , [4] R. Das, Advances in Active Radar Seeker Technology, McGraw-Hill, [5] G. M. Siouris, Missile Guidance and Control Systems, Springer, : ( ) : ( ) : [ 주관심분야 ],,, DOA : ( ) : LIG [ 주관심분야 ] EA,, : ( ) : [ 주관심분야 ] M & S : ( ) : ( ) : LIG [ 주관심분야 ] EA, 244

9 : ( ) : LIG [ 주관심분야 ] EA : ( ) : ( ) : ( ) : [ 주관심분야 ], : ( ) : ( ) : LIG [ 주관심분야 ], : ( ) : ( ) : ( ) : : : /IR [ 주관심분야 ],, RCS 245

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 6, Jun Rate). STAP(Space-Time Adaptive Processing)., -

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2018 Jun.; 29(6), 457463. http://dx.doi.org/10.5515/kjkiees.2018.29.6.457 ISSN 1226-3133 (Print)ISSN 2288-226X (Online) Sigma-Delta