| The Listen-in Technique for Blind Signals |
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Sun-Phil Nah, Cheol-Sun Park, Won Jang |
| 블라인드 신호 감청기술 |
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나선필, 박철순, 장원 |
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국방과학연구소 |
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| Abstract |
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In this paper, we propose a new listen-in technique to overcome the problems and the shortcomings which could possibly meet in the previous listen-in methods to deal with the blind signal manually according to operator's decision. In the proposed listen-in method, receiving the signals, classifying the modulation types, and demodulating the signals can be done automatically without operator's intervention. We realize the listen-in technology by developing the high speed frequency tuner, the automatic modulation recognizer, and the signal demodulator. In conclusion, we confirm and show that the developed equipment has a good performance in classifying the modulation type through the computer simulation and the field test. |
| Key Words:
Signal Tuning, Automatic Modulation Recognition, Signal Demodulator, Phase Locked Loop, Direct Digital Frequency Synthesis, Intermediate Frequency, Digital Downconverter |
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