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통신 신호 방향 탐지를 위한 광대역 다중 채널 수신기 개발
장재원,안준일,주증민,이동원,Chang, Jaewon,Ahn, Junil,Joo, Jeungmin,Lee, Dongweon 한국군사과학기술학회 2021 한국군사과학기술학회지 Vol.24 No.5
In wireless environments, wideband receivers are used in a communication intelligent system to detect unknown signals and obtain azimuth information. To design a wideband receiver that performs multiple signal detection and direction finding simultaneously, it is necessary to consider a reception structure composed of multiple channels. In this paper, we propose a wideband multi-channel receiver for direction finding of unknown wideband communication signals including frequency hopping signals. A signal processing method for detecting received signals and estimating azimuth information is presented, and components of the manufactured wideband receiver are described. In addition, test results of the signal detection performance by mounting the proposed wideband multi-channel receiver on the flight system are included.
FM 방송 기반 멀티스태틱 PCL 시스템 원형 배열 안테나 보정을 위한 Array Manifold 측정 및 검증
박준식,심홍석,안준일,송규하,Park, Junsik,Shim, Hongsuk,Ahn, Junil,Song, Kyuha 한국군사과학기술학회 2021 한국군사과학기술학회지 Vol.24 No.2
This study describes a method of measurement and verification of array manifold of uniform circular array antenna applicable to multistatic Passive Coherent Location(PCL) system using FM broadcasting. In an environment of outdoor test where FM broadcast signals are scattered, array manifold measurement methods using network analyzer and multi-channel digital receiver are introduced. Also, the descriptions and solutions for the test limits of each measurement method and the considerations affecting the measurement accuracy are presented. In addition, to verify the validity of the measured array manifold, the gain and phase difference were compared with the array manifold data obtained by EM simulation, and the effectiveness and accuracy of the measured array manifolds were compared and analyzed by estimating the direction of arrival of the FM broadcast signal received from the multistatic PCL system.