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 ( 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

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

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

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

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

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