• 한국정보전자통신기술학회논문지
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• 제4권1호
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• pp.39-45
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• 2011

본 논문에서는 공통의 플랫폼을 기반으로 하는 모바일 와이맥스 기지국 운용용 휴대형 신호분석 시스템의 설계방법을 제안하고, 이를 하드웨어 모듈로 구현하였다. 새롭게 제안한 신호분석 방법은 RF 신호의 IF 신호로의 하향 변환 및 이득제어를 수행하는 광대역 RF 모듈과 계측 기능을 수행하는 DSP 기반 디지털 신호분석 모듈로 구현하는 것이다. 타 고정 대형 시스템과의 비교를 통해 수행한 신호분석 알고리즘의 성능을 검증한 결과, 분해능의 차이는 없음을 확인하였다.

• 한국항공우주학회지
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• 제37권11호
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• pp.1148-1156
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• 2009

본 논문에서는 위성항법분야에서 다양한 응용서비스와 항법알고리즘을 개발 또는 검증하기 위하 기능을 제공하기 위한 소프트웨어 기반의 GNSS 신호시뮬레이터 개발에 관한 것이다. GNSS 신호생성 시뮬레이터를 개발하기 위하여 위성궤도생성, 항법메시지생성, 오차생성, IF 신호생성부로 나누어 구현하였으며 각 기능은 서로의 인터페이스를 통하여 데이터를 전송하게 된다. 여기서 실질적인 위성신호와 유사한 IF 신호를 생성하기 위하여 본 논문에서 제안한 신호생성 알고리즘을 이용하여 신호를 생성한 후 수신기를 통하여 생성된 신호를 검증하였다.

• ETRI Journal
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• 제41권5호
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• pp.670-683
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• 2019

In this paper, we analyzed the signal integrity of a system interconnection module for a proposed high-density server. The proposed server integrates several components into a chassis. Therefore, the proposed server can access multiple computing resources. To support the system interconnection, among the highly integrated computing resources, the interconnection module, which is based on Serial RapidIO, has been newly adopted and supports a bandwidth of 800 Gbps while routing 160 differential signal traces. The module was designed for two different stack-up types on a printed circuit board. Each module was designed into 12- (version 1) and 14-layer (version 2) versions with thicknesses of 1.5T and 1.8T, respectively. Version 1 has a structure with two consecutive high-speed signal-layers in the middle of two power planes, whereas Version 2 has a single high-speed signal placed only in the space between two power planes. To analyze the signal integrity of the module, we probed the S-parameters, eye-diagrams, and crosstalk voltages. The results show that the high-speed signal integrity of Version 2 has a better quality than Version 1, even if the signal trace length is increased.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 V
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• pp.2609-2612
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• 2003

This paper describes a 64 channel signal generator/analyzer module that is useful for verification and testing of digital circuits. It can perform logic analyzer function and signal generator function at the same time. The 64 Channel module is implemented with single FPGA chip for miniaturization, and an USB interface is used to increase portability of the module. Multiple modules can be used in parallel for the verification of large scale circuits. Moreover, since the module is implemented as a PC based system, one can configure convenient GUI(Graphic User Interface) environment.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2002년도 종합학술발표회 논문집 Vol.12 No.1
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• pp.118-122
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• 2002

This paper is concerned with the design of the beam forming module that is a key unit of the active phased array antenna(APAA) system for mobile satellite communications. This module includes two blocks for main signal and tracking signal. Main signal block has the role of transmitting input signal from phased away antenna to tracking signal block. And, tracking signal block executes main roles, beam forming of tracking signal and electronic beam control. The several electrical performances of this module, phase characteristics and linear gain, etc., agreed with specifications needed for APAA, and for more clear verification of the performances, the satellite communication test of the APAA including the modules was accomplished in the outdoors.

• 제어로봇시스템학회논문지
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• 제12궈1호
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• pp.33-40
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• 2006

We present a new technological concept named RCP (Robotic Cellular Phone), which combines RT and CP. That is an ubiquitous robot. RCP consists of 3 sub-modules, RCP Mobility, RCP interaction, and RCP Integration. RCP Interaction is the main focus of this paper. It is an interactive emotion system which provides CP with multi-emotional signal receiving functionalities. RCP Interaction is linked with communication functions of CP in order to interface between CP and user through a variety of emotional models. It is divided into a tactile, an olfactory and a visual mode. The tactile signal receiving module is designed by patterns and beat frequencies which are made by mechanical-vibration conversion of the musical melody, rhythm and harmony. The olfactory signal receiving module is designed by switching control of perfume-injection nozzles which are able to give the signal receiving to the CP-called user through a special kind of smell according to the CP-calling user. The visual signal receiving module is made by motion control of DC-motored wheel-based system which can inform the CP-called user of the signal receiving through a desired motion according to the CP-calling user. In this paper, a prototype system is developed far multi-emotional signal receiving modes of CP. We describe an overall structure of the system and provide experimental results of the functional modules.

• Journal of Positioning, Navigation, and Timing
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• 제10권1호
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• pp.1-12
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• 2021

Due to the Global Navigation Satellite System (GNSS) modernization, the recently launched GNSS satellites transmit signals at various frequency bands of L1, L2 and L5. Considering the Korea Positioning System (KPS) signal and other GNSS augmentation signals in the future, there is a high probability of applying more complex communication techniques to the new GNSS signals. For the reason, GNSS receivers based on flexible Software Defined Radio (SDR) concept needs to be developed to evaluate various experimental communication techniques by accessing each signal processing module in detail. In this paper, we introduce a multi-constellation (GPS/Galileo/BeiDou) multi-band (L1/L2/L5) SDR by utilizing Ettus USRP N210. The signal reception module of the developed SDR includes down-conversion, analog-to-digital conversion, signal acquisition, and tracking. The down-conversion module is designed based on the super-heterodyne method fitted for MHz sampling. The signal acquisition module performs PRN code generation and FFT operation and the signal tracking module implements delay/phase/frequency locked loops only by software. In general, it is difficult to sample entire main lobe components of L5 band signals due to their higher chipping rate compared with L1 and L2 band signals. Experiment result shows that it is possible to acquire and track the under-sampled signals by the developed SDR.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.711-713
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• 2004

In the past time, the protection relay did only a protection function. Currently, its upgraded device i.e. IED(Intelligent Electric Device) has been designed to protect, control, and monitor the whole power system automatically. Also the device is desired to successfully measure important elements of the power system. This paper considers design method of a digital protection IED with a function of measuring various elements and a communication function. The protection IED is composed of the specific function modules that are signal process module, communication module, input/output module and main control module. A signal process module use a DSP processor for analysis of input signal. Main control module use a embedded processor, Xscale, that has an ARM Core. The communication protocol uses IEC61850 protocol that becomes standard in the future. The protection IED is able to process mass information with high-performance processor. As each function module is designed individually, the reliability of the device can be enhanced.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.491-492
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• 2008

According to high-speed large scale integration trend of Memory module product, many type of noises, such a reflection, cross-talk simultaneous switching noise, occur on the Package PCB and they make the deterioration of memory module's performance and reliability. As module products have more high efficiency, Hardware of test board and socket has to be considered In test of the high-speed Memory Module. we mainly focused on improvement of Signal integrity Using the High Frequency Test socket that we invented

• 한국전자파학회논문지
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• 제14권1호
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• pp.62-67
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• 2003

본 논문은 이동 위성통신을 위한 능동위상배열 안테나 시스템의 주요 부품 중의 하나인 빔 성형모듈 설계에 관하여 서술한다. 본 모듈은 주 신호 및 추적신호를 위한 두 개의 모듈로 구성되어 있다. 이중, 주 신호블록은 위상배열 안테나로부터 입력된 신호전력을 추적신호 블록으로 전송하는 역할을 수행하며, 추적신호 블록은 능동위상배열 안테나 시스템의 주요 기능인 추적신호의 빔 성형과 전자적 빔 제어기능을 수행한다. 또한, 본 모듈은 위상특성 및 선형이득 등의 시스템에서 요구되는 전기적 사양을 만족하며, 해당 성능의 보다 면밀한 검증을 위하여, 제작된 빔 성형모듈을 장착한 능동위상배열 안테나 시스템을 이용하여 야외구동시험을 수행하였다.