THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE May; 26(5),

Size: px

Start display at page:

Download "THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE May; 26(5),"

소율 미
5 years ago
Views:

1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE May; 26(5), ISSN (Print)ISSN X (Online) 77 GHz A Virtual Array Design of 77 GHz Vehicle Radar for Detecting Moving Targets 김두수 홍동희 주정명 양진모 이상인 Doo-Soo KimDong-Hee HongJeong-Myeong Joo*Jin-Mo YangSang-In Lee 요약 77 GHz.,,. 10 db.,. ( ) ( com =0 ), 1015 db. Abstract This paper specifies on a virtual array design of a 77 GHz vehicle radar for detecting a moving target at a time division transmit and a near range. The virtual array designed reduces a hardware complexity, weight and price. However, a synthesized beam of the virtual array has a high side lobe by a phase distortion of receive signals when the moving target is detected at the time division transmit. For this, a subarray receive signal with a same phase is used and the side lobe of the synthesized beam is suppressed above at least 10 db. Also the virtual array has a beam distortion by a spherical wave when the vehicle radar operates at near range. So a boresight receive signal of each target range is compensated at each receive signal. Therefore the synthesized beam with compensation recovers a normal main lobe and improves the side lobe about 1015 db. Key words: Vehicle Radar, Virtual Array, Time Division Transmit, Near Range Beam Forming, Compensation. 서론,. [1] RF(Radio Frequency) (transmit receive module) (Agency for Defense Development) *LIG (LIG Nex1) Manuscript received November 14, 2014; Revised April 7, 2015 ; Accepted April 13, (ID No ) Corresponding Author: Doo-Soo Kim ( dsoo@add.re.kr) c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. 435

2 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 5, May [2],[3].,,. (target resolution),.,. (virtual array) [4]..,.,.,,.. λ,. 10 λ, [4],[6],[7].,.,, [4],[6]. [7],. multiplicative [8],[9],,. (false target)., multiplicative.. 2, 3. 4, 5.. 가상배열 (Virtual Array) 개념 1. M N, 1 MN. (1) (array factor). sin sin sin sin sin (1) 436

77 GHz 그림 1. Fig. 1. Virtual array structure.,,, m n,. (2-way). 2 5 12 12 60. 0.6 λ 35 db taylor. M+N MN+1 그림 2. Fig. 2. Synthesized antenna beam of virtual array.

3 77 GHz 그림 1. Fig. 1. Virtual array structure.,,, m n,. (2-way) λ 35 db taylor. M+N MN+1 그림 2. Fig. 2. Synthesized antenna beam of virtual array.,.. 이동표적탐지가상배열설계 3-1 시분할송신에의한표적신호위상왜곡 (orthogonal waveform), (2). ( ), (m, n), (M, N) (pulse duration) (T). (2) floor. 437

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 5, May 2015. 그림 3. Fig. 3. Phase distortion by target movement. for. 4 5(M==5) 12(N=12) ( ) +28, 0, 28 m/s.

4 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 5, May 그림 3. Fig. 3. Phase distortion by target movement. for. 4 5(M==5) 12(N=12) ( ) +28, 0, 28 m/s. M, N. (+28 m/s) (28 m/s). (2) 그림 5. Fig. 5. Synthesized antenna beam by phase distortion characteristic ,,. ±28 m/s 5,., (false alarm). 3-2 부배열수신신호를이용한안테나빔부엽개선 그림 4. Fig. 4. Phase distortion characteristic by movement velocity of target.. M N MN N. 4 M, N 438

( ) (null) 10 db. (3) 그림 7. ( ) Fig. 7. Synthesized multi beam of virtual array(after subarray beam applied).

5 77 GHz 그림 6. ( /) Fig. 6. Synthesized antenna beam of virtual array(before/after subarray beam applied).. N (3). (3) MN, N. P(m, n) (2), MN N. (1). sin sin sin sin 6 (3) +28 m/s /. 35 db taylor. ( ) (null) 10 db. (3) 그림 7. ( ) Fig. 7. Synthesized multi beam of virtual array(after subarray beam applied).. (false alarm rate) m/s. ±30,,.. 근거리표적탐지가상배열설계 4-1 근거리표적에의한위상왜곡. 8, y ( ) ( ) P. P (spherical coordinate) 439

6 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 5, May 그림 8. Fig. 8. Geometrical arrangement of array element for E-field approximation. (r), (, θ=90 ) y ( ). (4) (binomial expansion),, (4) y [5]. sin cos sincos (4) P.,. λ/16 (R) (4-1) (4-2) [5]. (4-1), (4-2). D. (4-1) 그림 9. Fig. 9. Relative range distribution between targe and array elements for each target range. (4-2). sin sin for for (4-1) cos (4-2) 9 (4-2) (=0 ). 5 12, 2 m, 3 m, 4 m., GHz. (5) (4-2).. 440

7 77 GHz 그림 10. Fig. 10. Relative phase distribution among array elements for each target range. sin (5) (5) +28 m/s 30. (main lobe) (shape),,. 2 그림 12. (30 ) Fig. 12. Synthesized antenna beam for each target range(30 degree scan beam) 근거리표적에대한안테나빔보정 8 (r) (, θ=90 ).,. sin (6) 그림 11. ( ) Fig. 11. Synthesized antenna beam for each target range (boresight beam). (6). (5),. (=0 ), com =

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE.

8 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 5, May 그림 13. ( ) Fig. 13. Compensated antenna beam for each target range (boresight beam). 그림 15. (: 3 m) Fig. 15. Synthesized multi beam with compensation (target range: 3 m).. (: +) (: ).. 결론 그림 14. (30 ) Fig. 14. Compensated antenna beam for each target range (30 degree scan beam).,. (=0 ) 1015 db. ± db, m. ± GHz.,,.. ( ) 10 db.,,.. 442

77 GHz (30 +30 ) ( com =0 ), 1015 db.. References [1] F. Folster, H. Rohling, and U. Lubbert, "An automotive radar network-based on 77 GHz FMCW sensors", Radar Conference 2005, pp. 871-876, May 2005.

47-50, Oct. 2007. [3] W. L. van Rossum, C. M. Lievers, A. P. M. Maas, and A. G. Huizing "Suppression of sidelobe scatterers in an AESA FMCW radar", Radar Conference 2008, pp. 1-5, 2008.

9 77 GHz ( ) ( com =0 ), 1015 db.. References [1] F. Folster, H. Rohling, and U. Lubbert, "An automotive radar network-based on 77 GHz FMCW sensors", Radar Conference 2005, pp , May [2] C. M. Lievers, W. L. van Rossum, A. P. M. Maas, and A. G. Huizing, "Digital beam forming on transmit and receive with an AESA FMCW radar", Proceeding of the 4th European Radar Conference 2007, pp , Oct [3] W. L. van Rossum, C. M. Lievers, A. P. M. Maas, and A. G. Huizing "Suppression of sidelobe scatterers in an AESA FMCW radar", Radar Conference 2008, pp. 1-5, [4] Martin Schneider, "Automotive radar - status and trends", IEEE-German Microwave Conference 2005(GeMic 2005), pp , [5] C. A. Balanis, Antenna Theory, John Wiley & Sons Inc., pp , [6] M. S Lee, Y. H Kim, "Design and performance of a 24- GHz switch-antenna array FMCW radar system for automotive applications", IEEE Transactions on Vehicular Technology, pp , vol. 59, issue 5, [7] C. Hu, Y. Liu, H. Meng, and X. Wang, "Randomized switched antenna array FMCW radar for automotive applications", IEEE Transactions on Vehicular Technology, pp , vol. 63, issue 8, [8] Robert H. Macphie, T. H. Yoon, "Grating lobe suppression with a thinned multiplicative receiving array", Microwave Conference Proceedings, APMC [9] D. E. N Davies, C. R. Ward, "Low sidelobe patterns from thinned arrays using multiplicative processing", Communications, Radar and Signal Processing, IEE Proceedings, vol. 127, issue 1, : ( ) : () : [ 주관심분야 ],, : () : () : () : [ 주관심분야 ] 443

10 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 5, May 주정 명 년 2월: 홍익대학교 전자전기공학부 공학사) 년 2월: 홍익대학교 전자정보통신공 학과 (공학석사) 2013년 1월 현재 : LIG 넥스원 감시정찰 연구소 ISR 연구센터 연구원 [주 관심분야] 레이더 시스템, 수동 및 능 동 위상 배열 안테나 이상 인 2011 ( 2013 양진 모 년 월 아주대학교 전자공학과 (공학 사 년 월 아주대학교 전자공학과 (공학 석사 년 월 현재: 국방과학연구소 책임 연구원 2011년 2월: 충남대학교 전자공학과 (공학 박사) [주 관심분야] 레이더 시스템, 능동 위상 배열 시스템 : ) : ) 년 월 연세대학교 전자공학과 (공학 사 년 월 연세대학교 전자공학과 (공학 석사 년 월 현재: 국방과학연구소 책임 연구원 [주 관심분야] 레이더 시스템/신호처리, 표 : ) : ) 적특성

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jun.; 27(6),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2016 Jun.; 276), 504511. http://dx.doi.org/10.5515/kjkiees.2016.27.6.504 ISSN 1226-3133 Print)ISSN 2288-226X Online) Near-Field