THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2015 Jun; 26(6), 546 554. http://dx.doi.org/10.5515/kjkiees.2015.26.6.546 ISSN 1226-3133 (Print) ISSN 2288-226X (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, 2015. (ID No. 20150205-011) Corresponding Author: Jihoon Kim (e-mail: kirana6666@gmail.com) 546 c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved.
,.. 2, 3 2. 4 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 1 2. 1 15 bits,. R4., 15 bits. 3 2 XOR. 2 3. R4. 그림 1. Fig. 1. Schematic diagram of pseudo-random noise radar. 그림 3. Fig. 3. Pseudo noise code. 547
THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 6, Jun 2015. 표 1. 2 Table 1. Fig. 2 Pseudo noise code output. State R 1 R 2 R 3 R 4 1 1 1 1 1 2 0 1 1 1 3 0 0 1 1 4 0 0 0 1 5 1 0 0 0 6 0 1 0 0 7 0 0 1 0 8 1 0 0 1 9 1 1 0 0 10 0 1 1 0 11 1 0 1 1 12 0 1 0 1 13 1 0 1 0 14 1 1 0 1 15 1 1 1 0 16 1 1 1 1 표 2. 3 Table 2. Fig. 3 pseudo noise code output. State R 1 R 2 R 3 R 4 1 1 1 1 1 2 0 1 1 1 3 1 0 1 1 4 0 1 0 1 5 1 0 1 0 6 1 1 0 1 7 0 1 1 0 8 0 0 1 1 9 1 0 0 1 10 0 1 0 0 11 0 0 1 0 12 0 0 0 1 13 1 0 0 0 14 1 1 0 0 15 1 1 1 0 16 1 1 1 1 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
그림 5. Fig. 5. Theoretical method of sequential sampling. 9 butter worth low pass [11],[12]. 2-2 순차적샘플링원리 - -. 5. -,.,,.,,,.,,,. 2-3 개념증명 6. D-F/F 그림 6. Fig. 6. Schematic diagram of pseudo-random noise generator.. 255 bits, 127 bits. breadboard 127 bits, 127 bits. 255 bits.,. 7 255 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, 8. 9. 9, 9 549
THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 6, Jun 2015. 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.. 1. 1 그림 10. ( ),, Fig. 10. Two different pseudo-random noise signal(simulated), Original signal, Different signal. 4 km (13.3 μs), 10, 10 ( ) 10, 550
그림 11. 10, 10 ( ) Fig. 11. Matched filtering of Fig. 10, Matched filtering of Fig. 10(simulated). ( ). 11. 10,., 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 [1 1 0 1 0 0 1]. 14. 14 그림 13. Fig. 13. Schematic diagram of experiment setup of noise generator. 551
THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 6, Jun 2015. 그림 14., Fig. 14. Output of Noise generator, Modulation circuit., 14. 0.3 μs. D-F/F 0.23 μs. 15, 16. 127 bits [1 1 0 1 0 0 1]. 15, 16. breadboard,,..,. 17. 17, 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
그림 17., Fig. 17. Result of sequential sampling, normal sampling. 300. 300 300. 301 301, 302., 300 300,.,.,.. 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
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