군집위성 임무운영시스템 발전방향 및 자동화 우선순위 평가

정인식,윤정훈,이명신,이정현,권기범,Jung, Insik,Yoon, Jeonghun,Lee, Myungshin,Lee, Junghyun,Kwon, Kybeom 항공우주시스템공학회 2022 항공우주시스템공학회지 Vol.16 No.3

According to the Space Development Promotion Basic Plan, more than 110 satellites are expected to be deployed by 2031. Accordingly, the operation concept and technology for satellites constellation are required, compared to the existing few multi-satellite operations. It is essential to automate and optimize the mission operation system, for efficient operation of the satellite constellation, and preparations are urgently needed for the operation of satellite constellation in domestic as well. In this study, the development direction and strategy of the mission operation system applying automation and optimization for efficient operation of the satellite constellation are proposed. The framework for evaluating the automation level and priority of the mission operation system was developed, to identify the tasks to which automation should be applied preferentially.

NASA의 Space Operations Cost Model을 이용한 지구 저궤도 위성의 운영비용 추정

정인식 ( Insik Jung ) 공군사관학교 2016 군사과학논집 Vol.67 No.2

하나의 인공위성을 개발하기 위해서는 여러 가지 단계를 거치게 된다. 먼저 그 인공위성이 수행하게 될 임무의 개념을 정하고 그 개념에 맞는 임무 설계 및 수행 방법 등을 결정한 후에 위성의 개발이 이루어지는데, 이 논문에서는 위성 개발이 본격적으로 시작되기 이전 단계에서 결정되는 사항들을 바탕으로 그 위성이 임무를 수행할 때 필요한 운영비용을 추정하는 방법을 제시하였다. 이를 위하여 NASA에서 개발한 Space Operations Cost Model(SOCM)을 활용하였고 모델에 포함되어 있는 수치들을 현재의 자료에 맞게 최신화하여 운영비용을 추정하였다. 임무 설계가 시작되면 개략적인 위성의 사양이 결정되는데 이를 바탕으로 ±30% 정도의 정확도를 가진 운영비용을 추정하고, 향후 위성이 개발되면서 결정되는 좀 더 자세한 위성의 사양을 통해 이전에 추정한 비용을 수정하여 최종적으로 ±20%의 정확도를 가진 운영비용을 추정할 수 있다. 결과 검증을 위해 현재 운영 중에 있는 여러 지상국의 연간 운영비용과 비교하였다. A few steps are needed to develop one satellite. First of all, we should decide a mission architecture, and then, mission design and process planning is followed. After theses decision, satellite development is started. This paper presents operations cost estimation method during the satellite operation phase basis of a few input data before development phase. Using the Space Operations Cost Model(SOCM) that developed by NASA, and customizing the date of the model, the operations cost is estimated. When the mission design is started, satellite specification`s outline is decided, using these data, we can estimate the operations cost that has ±30% error. Using the more detailed specifications after a few development steps, we can correct estimated operations cost to more precise one that has ±20% error. For the validate the result of estimation, some ground stations annual budget is compared.

공군사관학교 지상국 S-band 통신시스템 검증 및 Link buget 분석

정인식 ( Insik Jung ),이상현 ( Sanghyun Lee ) 공군사관학교 2016 空士論文集 Vol.67 No.2

The Republic of Korea Air Force Academy has been developing 3U cubesat to demonstrate future military satellite capabilities and plans to complete its development by 2018. One of the capabilities is to take images of battle area of interest and transmit the imagery data to a potential military space operation center. In order to transmit high volume of data within a limited time, the use of S-band is required for the link between cubesat and ground station, although the cubesat communication is usually done by VHF/UHF due to its size and power limit. To support this mission, the ground station equipped with S-band reception system has been constructed at the Republic of Korea Air Force Academy. This is the first ground station at the university level in Republic of Korea, in which S-band communication capability is installed as well as VHF and UHF. The ground station consists of elevation-azimuth motorized antennas, radio unit, and telemetry, tracking and control. The antennas are composed of two Yagi antennas for VHF and UHF, and a parabolic antenna for S-band. They can rotate on 3 axis. S-band for imagery data transmission uses 2.2 ~ 2.4 GHz and the target data rate is up to over 1 Mbps. In order to enhance antenna reception gain, 3 m mesh-type is used. The verification of the constructed ground station is ongoing. For the initial checkup, amateur radio communication has been successfully demonstrated between two ground spots. Reception of the beacon signal from amateur satellite (VO-52) has also been successfully demonstrated. S-band is also checked through network analyzer by receiving the beacon signal from CINEMA cubesat. Link budget is also calculated for checking the capability of high volume of imagery data transmission, and it is enough to support target transmission speed.

NASA의 Space Operations Cost Model을 이용한 지구 저궤도 위성의 운영비용 추정

정인식 ( Insik Jung ) 공군사관학교 2016 空士論文集 Vol.67 No.2

A few steps are needed to develop one satellite. First of all, we should decide a mission architecture, and then, mission design and process planning is followed. After theses decision, satellite development is started. This paper presents operations cost estimation method during the satellite operation phase basis of a few input data before development phase. Using the Space Operations Cost Model(SOCM) that developed by NASA, and customizing the date of the model, the operations cost is estimated. When the mission design is started, satellite specification`s outline is decided, using these data, we can estimate the operations cost that has ±30% error. Using the more detailed specifications after a few development steps, we can correct estimated operations cost to more precise one that has ±20% error. For the validate the result of estimation, some ground stations annual budget is compared.

지능형 다중 에이전트를 활용한 군집위성 임무계획 자동화 방안

정인식(Insik Jung),정대원(Daewon Chung),이기문(Kimoon Lee),김선훈(Seonhoon Kim),최모건(Morgan Choi),신승민(Seungmin Shin),김동진(Dongjin Kim) 한국항공우주학회 2023 한국항공우주학회 학술발표회 논문집 Vol.2023 No.4

통합 SNS 게이트웨이를 위한 웹 서비스 어댑터 구현 및 성능 분석

정인식 ( Insik Jung ),김현우 ( Hyeonwoo Kim ),권동우 ( Dongwoo Kwon ),주홍택 ( Hongtaek Ju ) 한국인터넷정보학회 2014 인터넷정보학회논문지 Vol.15 No.1

본 논문은 모바일 SNS 트래픽을 줄이는 방안으로 통합 SNS 게이트웨이를 이용하는 방법을 제시한다. 통합 SNS 게이트웨이는 모바일 클라이언트와 SNS 서버 사이에서 통신 중계자 역할을 한다. 통합 SNS 게이트웨이 내에서 SNS 서버와의 통신을 담당하는 웹 서비스 어댑터의 역할을 제안하고 구현하였다. 또한, 통합 SNS 게이트웨이 내의 캐시 엔진을 사용하여 사용자가 통합 SNS 게이트웨이를 통하여 특정 SNS 서버에게 콘텐츠를 요청할 때 발생하는 트래픽량과 응답 시간에 대한 성능을 측정하고 분석하여 결과를 제시한다. In this paper, we present integrated SNS Gateway as way to reduce mobile SNS traffic. Integrated SNS gateway`s role is communication broker that located between mobile clients and SNS server. In Integrated SNS gateway, web service adapter communicates with SNS Server. Experiment was performed in aspects of contents RTT and network traffic. We evaluate and propose performances of integrated SNS gateway using gateway.

공군사관학교 지상국 S-band 통신시스템 검증 및 Link buget 분석

정인식 ( Insik Jung ),이상현 ( Sanghyun Lee ) 공군사관학교 2016 군사과학논집 Vol.67 No.2

대한민국 공군사관학교는 미래 군사위성의 운용능력을 실증하기 위해 2018년 개발을 목표로 3U크기의 초소형 인공위성을 개발하고 있다. 운용능력 중 하나는 관심 전장의 사진을 촬영하고 군 우주운영센터로 이를 전송하는 것이다. 초소형 인공위성의 전력과 크기로 인해 VHF/UHF대역을 주로 사용하는 것과 대조적으로 제한된 시간에 고용량의 데이터를 전송하기 위해서는 지상국과 위성간S-band 대역의 통신이 필요하다. 이러한 임무를 위해 공군사관학교에 VHF/UHF를 포함한 S-band대역을 수신할 수 있는 지상국을 구축하였다. 지상국은 앙각과 방위각을 조절할 수 있는 안테나와 통신장비, TT&C를 전송할 수 있는 장비를 갖추고 있다. 안테나는 3축으로 움직일 수 있는 VHF/UHF용 2개의 야기 안테나와 S-band용 접시안테나로 구성되어 있다. 영상 수신을 위해 S-band 대역은 2.2 ~ 2.4 GHz를 사용하고 데이터 전송속도는 1Mbps 이상을 목표로 하고 있다. 또한 안테나 수신 이득을 높이기 위해 그물형의 3m 안테나를 사용하였다. 지상국 운영능력의 검증 작업은 아직 진행 중이다. 최초 점검으로 두 지상 지점간 아마추어 무선 통신은 성공적으로 이루어 졌으며 아마추어 위성(VO-52)으로부터 beacon 신호를 성공적으로 수신하였다. S-band 안테나는 신호 분석기를 통해 초소형위성 CINEMA로부터 S-band beacon 신호를 수신함을 확인하였다. 실제 임무수행간 영상데이터 전송능력 확인하기 위해 S-band 안테나의 Link budget 또한 계산하였으며, 목표로 하는 전송속도를 지원할 수 있음을 확인하였다. The Republic of Korea Air Force Academy has been developing 3U cubesat to demonstrate future military satellite capabilities and plans to complete its development by 2018. One of the capabilities is to take images of battle area of interest and transmit the imagery data to a potential military space operation center. In order to transmit high volume of data within a limited time, the use of S-band is required for the link between cubesat and ground station, although the cubesat communication is usually done by VHF/UHF due to its size and power limit. To support this mission, the ground station equipped with S-band reception system has been constructed at the Republic of Korea Air Force Academy. This is the first ground station at the university level in Republic of Korea, in which S-band communication capability is installed as well as VHF and UHF. The ground station consists of elevation-azimuth motorized antennas, radio unit, and telemetry, tracking and control. The antennas are composed of two Yagi antennas for VHF and UHF, and a parabolic antenna for S-band. They can rotate on 3 axis. S-band for imagery data transmission uses 2.2 ~ 2.4 GHz and the target data rate is up to over 1 Mbps. In order to enhance antenna reception gain, 3 m mesh-type is used. The verification of the constructed ground station is ongoing. For the initial checkup, amateur radio communication has been successfully demonstrated between two ground spots. Reception of the beacon signal from amateur satellite (VO-52) has also been successfully demonstrated. S-band is also checked through network analyzer by receiving the beacon signal from CINEMA cubesat. Link budget is also calculated for checking the capability of high volume of imagery data transmission, and it is enough to support target transmission speed.

다중 전자광학 감시체계를 활용한 저궤도 위성 거리정보 산출 방안

정인식(Insik Jung),정대원(Dae-won Chung),이기문(Kimoon Lee),이삼영(Samyoung Lee),신승민(Seungmin Shin),김동진(Dongjin Kim) 한국항공우주학회 2022 한국항공우주학회 학술발표회 논문집 Vol.2022 No.11

주파수 비동기 환경에 강인한 직교 코드 기반 블록 전송 (OCBT) 기반 SCMA 수신기 개발

정인식(Insik Jung),김태형(Taehyung Kim),허제현(Jehyun Heo),최수용(Sooyong Choi),홍대식(Daesik Hong) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.11

한국형 저비용 저고도 공중보급 체계용 낙하산 전개 특성 풍동시험

김승필,정인식,권기범,최윤석,정형석,Kim, Seung Pil,Jung, Insik,Kwon, Kybeom,Choi, Younseok,Chung, Hyoungseog 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.3

A wind tunnel test for the scaled parachute models was performed to verify aerodynamic characteristics for practical usage of Korean low cost low altitude aerial delivery system. The cruciform shaped cargo parachute models for heavy and light weight were ejected into wind tunnel test section; and the drag forces acting on the models in steady condition were measured in accordance with velocity. Also, the maximum opening forces during inflation were obtained and captured by a high speed camera to analyze the inflation characteristics and evaluate the design of the low cost aerial delivery system. The results showed a reliable stability and met the design requirement of delivery operation system for R.O.K Air Force.