THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2016 Aug.; 27(8), 693700. http://dx.doi.org/10.5515/kjkiees.2016.27.8.693 ISSN 1226-3133 (Print)ISSN 2288-226X (Online) Design of Linear Interferometer Antenna Regarding Beamwidth 최익환 Ik-Hwan Choi 요약,.,,,, 5,,., 0.01, 0.016, 99 %.. Abstract In this paper, it is represented that equations for design of linear interferometer antenna when the 3 db beamwidth is only region of interest. Using the equations, relationships between angle measurement ambiguity and element antenna spacings are described. And then, operating frequency, angle measurement accuracy, beamwidth, correct measurement probability are calculated for five antennas interferometer to measure azimuth and elevation angle. The interferometer antenna was designed and fabricated using the calculated parameters. The angle measurement accuracy were 0.01 and 0.016 for azimuth and elevation axes with 99 % probability of doing measurements correctly which means that ambiguous solution did not occur more than 1 % of the time. These results validated the equations and design procedures. Key words: Interferometer Antenna, Antenna Spacing. 서론.,,.. 2, [1],[2]..,., (Agency for Defense Development) Manuscript received June 21, 2016 ; Revised August 3, 2016 ; Accepted August 17, 2016. (ID No. 20160621-067) Corresponding Author: Ik-Hwan Choi (e-mail: ikhwanchoi@add.re.kr) c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. 693
THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 8, Aug. 2016.. [3]. ±90,.,,,, 5,,., 0.01, 0.016, 99 %... 선형간섭계안테나설계방법 2-1 구성안테나 2개를이용한선형간섭계 1 A1 A2, (1) [4][7]. sin (1) sin (2).,,. (2) sin (3) [8][10]. 그림 2. sin Fig. 2. Condition of x and m for unambiguity. modulo sin (3) (3) sin,. sin, (4).,. 2-2 구성안테나 3 개를이용한선형간섭계. 3 3,., 그림 1. Fig. 1. Concept of phase difference measurement of collinear two element antennas. [10][14]. 3,, A2 A1 A2, A3 A2 (5). 694
그림 3. 3 Fig. 3. Concept of phase difference measurement of collinear three element antennas. sin modulo sin sin modulo sin (5),,, sin modulo (6).. 0 1. (7),. 4,., sin sin (8) 그림 4. Fig. 4. Unambiguity condition of and regarding beamwidth., sin sin., 3 sin sin. sin sin, sin sin (10). (9), (9). (11) 695
THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 8, Aug. 2016.. RF, (11),., (11)..,,., 2, (16). (16) (12) SNR. (18). (17) (12) cos (18).,, (8) (13), (8) (13) sin. (11) (14), (14).,.. 선형간섭계안테나설계및측정,, X, 23 dbi, 25 db, 10. SNR 27 db, 0.015. 5 (18) SNR,, SNR,. 2-3 SNR과각측정정확도,. (15) [3]. rad (15) 3 3. A1 A3 그림 5. SNR Fig. 5. regarding SNR and. 696
그림 6. Fig. 6. The front and back sides of an elementary antenna.. (18) cos (19), 1/2. 3. (19), sin. 4 5,,,.. 6. Electr. & 그림 7. OSU Fig. 7. Elementary antenna measurement in anechoic chamber in OSU. 그림 8. Fig. 8. Measurement and simulation results of an elementary antenna. Comput. Eng. ElectroScience Lab. /,, [15]. 7 OSU, 8 E-plane H-plane. 10 3 db, 23.7 db, 25 db, 72 db. 9, 3 5. (14) 9.2 RF,.,, 2,365 m, 187.78, 5.3, 697
THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 8, Aug. 2016. 그림 11. Fig. 11. Range rate and power of target signal. 그림 9. 5 Fig. 9. Elementary antenna arrangement of five antennas linear interferometer. 그림 12. Fig. 12. Difference between reference and measurement values. 그림 10. Fig. 10. Range rate and relative range of a target.. Trimble R8 10 cm. 2.4 km, 0.005. 10. 10 0 m/s ±0.5 m/s, 0 m 0 m/s ±1.1 m/s. 10 0 m 11. 11., SNR 27.34 db. 50,000 12. 12,,.,. SNR 27 db 0.015, 13, 0.010, 0.016.. 12 698
그림 13. Fig. 13. Comparison of PDF of normalized measurement data and ideal normal distribution. 13. 13, ± 99 %,. 2-2.. 결론 ±90 3 db, 3. 5,.,.. References [1] J. Jones, A. R. Webster, and W. K. Hocking, "An improved interferometer design for use with meteor radars", Radio Science, vol 33, no. 1, pp. 55-65, Jan-Feb 1998. [2] W. B. Kendall, "Unambiguous accuracy of an interferometer angle-measureing system", IEEE Transactions on Space Electronics and Telemetry, vol. SET-11, issue 2, pp. 62-70, 1965. [3] S. E. Lipsky, Microwave Passive Direction Finding, SciTECH, 2004. [4],, "2 ",, 31(10A), pp. 988-995, 2006 10. [5] C. S. Park, "The fast correlative interferometer direction finder using I/Q demodulator", 2006 Asia-Pacific Conference on Communications, pp. 1-5, 2006. [6] C. S. Park, "The array geometry design in airborne microwave 2-D direction finding", Fourth IEEE Workshop on Sensor Array and Multichannel Processing 2006, pp. 65-69, 2006. [7] S. V. Doan, "Algorithm for obtaining high accurate phase interferometer", 2016 26 th International Conference Radioelektronika, pp. 433-437, 2016. [8] Z. M. Liu, "Azimuth and elevation estimation with rotating long-baseline interferometers", IEEE Transactions on Signal Processing, vol. 63, issue 9, pp. 2405-2419, 2015. [9] A. Orduylmaz, "Hybrid phase amplitude direction finding method", 2015 23nd Signal Processing and Communications Applications Conference (SIU), pp. 109-112, 2015. [10] M. Zucco, "A two-wavelength interferometer for space applications", Precision Elevtromagnetic Measurements (CPEM 2014), 2014 Conference, pp. 242-243, 2014. [11] Y. H. Li, "A method for ambiguity solving based on rotary interferometer", Communications, Circuits and Systems (ICCCAS), 2013 International Conference, vol. 2, pp. 152-155, 2013. [12] L. Shi, "Algorithm of signal processing with five-channel interferometer", 2010 International Symposium on 699
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