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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jun; 26(6), ISSN (Print) ISSN X (Online) Proof-of-Concept Research on Pseudo-Random Noise Radar Using Sequential Sampling Method 김지훈 Jihoon Kim 요약,....,,,. Abstract Ultra-wideband(UWB) radar is widely used in many penetration radar applications, such as ground-penetrating radar and foliagepenetrating radar, because it has many advantages in detecting concealed objects. One type of UWB radar system is random noise radar, which many be robust to jamming environment. However conventional random noise radar requires high-speed analog-to-digital convertor(adc) for matched filtering. In this thesis, a pseudo-random noise radar system that maintains anti-jamming characteristics but does not require high-speed ADC is researched. and The UWB system is implemented in a low frequency system, and its performance has been demonstrated by experiment, which proves the concept of the proposed pseudo-random noise radar system. Key words: Pseudo-Random Noise Radar, Sequential Sampling, UWB Radar. 서론 (UWB: Ultra Wide Band) (resolution),, [1] [5]., (chirp), [6]. [7].,. 8 (The 8 th R&D Institute Researcher, Agency for Defense Development) Manuscript received February 5, 2015 ; Revised May 20, 2015 ; Accepted May 26, (ID No ) Corresponding Author: Jihoon Kim ( 546 c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved.

2 ,.. 2, , 3.. 본론 2-1 가상잡음신호원생성원리, [8].,. 1.,,. 4 km (13.3 μs).,. 2 (PN code: Pseudo Noise co- 그림 2. Fig. 2. Pseudo noise code. de). (LFSR: Linear Feedback Shift Register). 2,, XOR(Exclusive OR). (1), (gold code), (GPS : Ground Positioning System) [9]. (1) Table bits,. R4., 15 bits. 3 2 XOR R4. 그림 1. Fig. 1. Schematic diagram of pseudo-random noise radar. 그림 3. Fig. 3. Pseudo noise code. 547

3 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 6, Jun 표 1. 2 Table 1. Fig. 2 Pseudo noise code output. State R 1 R 2 R 3 R 표 2. 3 Table 2. Fig. 3 pseudo noise code output. State R 1 R 2 R 3 R 그림 4. Fig. 4. Schematic diagram of differential circuit.., [10].. DC low pass. 4 DC balanced feeding. (2).,.. (3) (2) (3), (4) (4) (5). (3) step function. (2) (4) (5) 548

4 그림 5. Fig. 5. Theoretical method of sequential sampling. 9 butter worth low pass [11],[12]. 2-2 순차적샘플링원리 ,.,,.,,,.,,,. 2-3 개념증명 6. D-F/F 그림 6. Fig. 6. Schematic diagram of pseudo-random noise generator bits, 127 bits. breadboard 127 bits, 127 bits. 255 bits., bits XOR D-F/F [7]. 7, 7. (discrete time) 0.2 μs first null bandwidth 5 MHz.. t/rc=5, t=0.25 μs, R=50 Ω, C=1 nf [13]. first null bandwidth 5 MHz. 8. 8, , 9 549

5 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 6, Jun 그림 7., ( ) Fig. 7. Generated pseudo-random noise signal(simulated) Time domain, Frequency domain. 그림 9., ( ) Fig. 9. Pseudo-random noise signals(simulated) before modulation, after modulation. 그림 8., ( ) Fig. 8. Modulated pseudo-random noise spectrum(simulated), After differential circuit, After low pass filter 그림 10. ( ),, Fig. 10. Two different pseudo-random noise signal(simulated), Original signal, Different signal. 4 km (13.3 μs), 10, 10 ( ) 10, 550

6 그림 , 10 ( ) Fig. 11. Matched filtering of Fig. 10, Matched filtering of Fig. 10(simulated). ( ) ,., 13.3 μs( 4 km), 10.,, ( ).. 송신부의구현 2 그림 12. Fig. 12. Schematic diagram of experiment.. 12.,,,. 13. D-F/F,, AND, OR, XOR. D-F/F, 1. 0, AND. 14 [ ] 그림 13. Fig. 13. Schematic diagram of experiment setup of noise generator. 551

7 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 6, Jun 그림 14., Fig. 14. Output of Noise generator, Modulation circuit., μs. D-F/F 0.23 μs. 15, bits [ ]. 15, 16. breadboard,,.., , 17 그림 15., Fig. 15. Comparison of simulation output signal with measured generator output signal Simulation output, Experiment output. 그림 16., Fig. 16. Comparison of simulation output signal with measured generator output signal Simulation output, Experiment output. 552

8 그림 17., Fig. 17. Result of sequential sampling, normal sampling , 302., ,.,.,.. 4 km(13.3 μs).,. 18, 13.3 μs, 18, Fig. 18., Fig. 18. Target response of simulation, experiment., (resolution). (7). c, bandwidth. 35 m, 60 m... 결론.,.,. (7) 553

9 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 6, Jun ,,. ( ).,,,. References [1] M. Ressler, L. Nguyen, F. Koenig, D. Wong, and G. Smith, "The army research laboratory synchronous impulse reconstruction forward-looking radar", Proc. SPIE, vol. 6561, [2] Daeman Kim, "Design of a resistive slot antenna for ultra-wideband ground-penetrating radar", GIST, [3] Nam-Koong, UP, "The study on high accurate calibration method for pulse compression radar", GIST, [4] Jihoon Kim, Woong Kang, and Kangwook Kim, "The resistive dipole antenna excited by an impulse generator for ultra-wideband radar applications", APS, [5] Jihyuk Cho, "Design of vivaldi antenna array and experimental performance verification for vehicular UWB forward looking radar", GIST, [6] Merrill Skolnik, Radar Handbook, 3rd ed., McGrawHill, [7] T. Thayaoaran, C. Wernik, "Noise radar technology basics", Defence Research and Develop Canada, [8] Bassem R. Mahafza, Radar Systems Analysis and Design Using MATLAB, 2nd ed.,champman & Hall/CRC, [9] Kevin Roebuck, GPS - Global Positioning System, Emereo Publishing, [10] M. Ghavami, L. B. Michael, and R. Kohno, Ultra Wideband Signals and Systems in Communication Engineering, 2nd ed.. Wiley & Sons, Inc., [11] David M. Pozar, Microwave Engineering, 3rd ed., John Wiley & Sons, Inc., [12] George L. Matthaei, Leo young, and E. M. T. Jones, Microwave Filters, Impedance-Matching Networks, and Coupling Structures, McGrawHill, [13] Randall W. Rhea, HF Filter Design and Computer Simulation, Noble Publishing Atlanta, : ( ) : ( ) : : [ 주관심분야 ],, 554

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