Modulation and demodulation method for covert underwater communication and transmission and reception apparatus using the same

According to some embodiments, provided is a signal modulation method of a transmitting device for covert underwater communication which comprises the following steps of: generating a whistle imitation signal using frequency values extracted at preset time intervals from a frequency contour of a dol...

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Bibliographic Details
Main Authors KIM WAN JIN, KIM YONG CHEOL, CHUNG JEA HAK, AN JONG MIN, LEE HO JUN, LEE SANG KUG
Format Patent
LanguageEnglish
Korean
Published 14.05.2021
Subjects
BASIC ELECTRONIC CIRCUITRY
CODE CONVERSION IN GENERAL
CODING
DECODING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:According to some embodiments, provided is a signal modulation method of a transmitting device for covert underwater communication which comprises the following steps of: generating a whistle imitation signal using frequency values extracted at preset time intervals from a frequency contour of a dolphin whistle; determining delay time to be used for modulation of the whistle imitation signal based on bit information to be transmitted and a modulation order; and obtaining a transmission signal by applying the determined delay time to the whistle imitation signal. In addition, a signal demodulation method of a receiving device corresponding to the signal modulation method of the transmitting device can be provided. 일부 실시예에 따르면, 돌고래 휘슬음의 주파수 윤곽에서 기 설정된 시간 간격마다 추출된 주파수 값들을 이용하여 휘슬음 모방 신호를 생성하는 단계, 전송하고자 하는 비트 정보 및 변조 차수에 기초하여 휘슬음 모방 신호의 변조에 이용될 지연 시간을 결정하는 단계, 및 결정된 지연 시간을 휘슬음 모방 신호에 적용함으로써 송신 신호를 획득하는 단계를 포함하는, 수중 은밀 통신을 위한 송신 장치의 신호 변조 방법이 제공될 수 있다. 또한, 전술한 송신 장치의 신호 변조 방법에 대응되는 수신 장치의 신호 복조 방법이 제공될 수 있다.
Bibliography:Application Number: KR20190176893