THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Dec.; 27(12),

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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Dec.; 27(12), ISSN (Print) ISSN X (Online) An Analysis on the Degradation of Elevation Angle Accuracy Due to the Multi-Path Effect Using a Phased Array Antenna and the Beam Pattern Optimization to Minimize Its Degradation 김영완 이재민 채희덕 진형석 박종국 Young-Wan Kim JaeMin Lee Heeduck Chae Hyung-suk Jin Jongkuk Park 요약.., /.,.. Abstract In this paper, an analysis about the elevation angle accuracy degradation of an APAR(Airport Precision Approach Radar) due to the multi-path effect using a phased array antenna was performed. An APAR installed around a runway of airport will be continuously affected in a runway surface of the fixed environment. In this paper, an analysis about the elevation angle accuracy degradation of APAR due to the multi-path effect of runway surface was conducted through a calculation of monopluse slope and sum/difference beam pattern analysis of array antenna. Also, a difference pattern for monopulse to minimize this degradation was optimized in an appropriate configuration to improve a elevation angle accuracy. Finally, a degree of improvement of elevation angle accuracy was confirmed by calculating a monopulse slope including the ground reflection after applying optimized difference patterns of array antenna. Key words: Multi-Path Effect, Elevation Angle Accuracy, Difference Beam Pattern. 서론.,. LIG (LIG Nex1) Manuscript received August 22, 2016 ; Revised September 19, 2016 ; Accepted December 9, (ID No ) Corresponding Author: Jongkuk Park ( jongkukpark@lignex1.com) 1036 c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved.

2 ..., nelder-mead simplex multipath reduction(nm- SMR) [1]. [2].,,.,.. MTI, (MTI, CFAR K-factor offset ), [3],[4]., /,,.,. /,. /.,.. 본론 2-1 다중경로효과개요.. 1 (direct component) (reflected component). ( ) 그림 1. Fig. 1. Ground reflection configuration 1037

3 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 12, Dec , [5]. (Added path length : ) (1). H. sin (1) (1)., 2, ( ) ( ) (2) [6]. sin cos sin cos /, 13, (2), 그림 2. Fig. 2. Ground reflection coefficient. (2) 표 1. Table 1. Simulation beam parameter Taylor 35 db, 1. 1,. (3). 1. (3),. (2),. :, : (3) matlab.,. 3(a) 1, 3(b). (b) (a) ( =0) ( ) (2) X (3) 1038

2-2 다중경로효과에따른패턴왜곡시뮬레이션 (3) matlab. (3) 4.,,.,, 5.. magic-t ring-hybrid, (discontinuity), 그림 5.

4 그림 3. Direct/reflected component Fig. 3. Direct/reflected component simulation. 그림 4. (theta angle) ( ) Fig. 4. Effect comparision of the elevation sum pattern due to the ground reflection(simulation). ( ) ( ). 2-2 다중경로효과에따른패턴왜곡시뮬레이션 (3) matlab. (3) 4.,,.,, 5.. magic-t ring-hybrid, (discontinuity), 그림 5. (theta angle) ( ) Fig. 5. Distortion analysis of pattern due to the elevation beam steering angle(simulation).., 6. 7 /. 1039

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 12, Dec. 2016. 그림 6. ( ) Fig. 6. Original pattern effect due to the ground reflection (simulation).., [7].

5 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 12, Dec 그림 6. ( ) Fig. 6. Original pattern effect due to the ground reflection (simulation).., [7]. 8, /,. /, db,. /, 그림 7. ( ) Fig. 7. Mono-pulse effect due to the ground reflection(simulation). / 7,,. 2-3 다중경로효과에의한패턴왜곡개선시뮬레 이션및제작결과 그림 8. ( ) Fig. 8. Feeding coefficient of the optimized difference pattern(simulation). 1040

그림 9. ( 15 15 )( ) Fig. 9. Optimized difference pattern comparision( 15 15 )(simulation). 그림 11.

6 그림 9. ( )( ) Fig. 9. Optimized difference pattern comparision( )(simulation). 그림 11. ( ) Fig. 11. Mono-pulse slope after applying the optimized difference pattern(simulation). 그림 10. / ( ) Fig. 10. Effect analysis of the optimized sum/difference due to the ground reflection(simulation).., , 7,,. 그림 12. Fig. 12. Measurement result of the difference pattern.,.,,. 1041

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 12, Dec. 2016.. 결론 그림 13. Fig. 13. Measurement result of the sum pattern.. /,.,... References 그림 14.

7 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 12, Dec 결론 그림 13. Fig. 13. Measurement result of the sum pattern.. /,.,... References 그림 14. Fig. 14. Feeding module fabrication configuration , 8, 2.. [1],,, " ",, 18(10), , [2] Yong Yang, De-jun Feng, Xue-song Wang, and Shunping Xiao, "Effect of k distributed sea clutter and multipath on radar detection of low altitude sea surface targets", IET Journals & Magazines, pp , [3],, " MTI ", 20(10), , p. 7, [4], " ", 12(7), , p. 7, [5] Lamont V. Blake, Radar Range-Performance Analysis, Artech House, Inc., [6] David M. Pozar, Microwave Engineering, John Wiley & Sons, Inc., [7] E. T. Bayliss, "Design of monopulse antenna difference patterns with low sidelobes", Alcatel-Lucent Journal, vol. 47, pp ,

8 : ( ) : ( ) : LIG [ 주관심분야 ],,, : ( ) : LIG [ 주관심분야 ] / TRM : ( ) : ( ) : LIG [ 주관심분야 ],,, : ( ) : ( ) : ( ) : LIG [ 주관심분야 ],,, : ( ) : ( ) : ( ) : LIG [ 주관심분야 ],,, 1043

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jul.; 27(7),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2016 Jul.; 27(7), 625634. http://dx.doi.org/10.5515/kjkiees.2016.27.7.625 ISSN 1226-3133 (Print)ISSN 2288-226X (Online) Near-Field