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J. KIMS Technol > Volume 22(3); 2019 > Article
Journal of the Korea Institute of Military Science and Technology 2019;22(3):332-340.
DOI: https://doi.org/10.9766/KIMST.2019.22.3.332   
Development of a Digital Receiver for Detecting Radar Signals
Minyeon Cha, Hyeokjae Choi, Sunghoon Kim, Byungjin Moon, Jaeyun Kim, Jonghyun Lee
Electronic Warfare Division, LIG Nex1
레이더 신호 탐지용 디지털수신기 개발
차민연, 최혁재, 김성훈, 문병진, 김재윤, 이종현
LIG넥스원(주) 전자전연구소
Abstract
Electronic warfare systems are needed to be advantageous in the modern war. Many radar threat signals with various frequency spectrums and complicated techniques exist. For detecting the threats, a receiver with wide and narrow-band digital processing is needed. To process a wide-band searching mode, a polyphase filter bank has become the architecture of choice to efficiently detect threats. A polyphase N-path filter aligns the re-sampled time series in each path, and a discrete Fourier transform aligns phase and separates the sub-channel baseband aliases. Multiple threats and CW are detected or rejected when the signals are received in different sub-channels. And also, to process a narrow-band precision mode, a direct down converter is needed to reduce aliasing by using a decimation filter. These digital logics are designed in a FPGA. This paper shows how to design and develop a wide and narrow-band digital receiver that is capable to detect the threats.
Key Words: Digital Receiver, Wide Band, Narrow Band, Radar Pulse, Polyphase Filter Bank


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