This work proposes improving the Flight Dynamics (FD) operational system for future planetary missions using insights gained from real-flight experience of Korea Pathfinder Lunar Orbiter (KPLO) mission. The KPLO, also known as Danuri, is South Korea's first lunar explorer launched on August 4, 2022 UTC, and currently successfully conducting its mission around Moon. KPLO FD specialists (FDSp) worked extensively designing, developing, verifying, validating, operating FD-related ground system,...

Korea’s first lunar mission, the Korea Pathfinder Lunar Orbiter (KPLO), aims to launch in mid-2022 via Space-X Falcon-9 vehicle. For successful flight operation of KPLO, Aerospace Research Institute (KARI) has designed and developed Flight Dynamics Subsystem (FDS). FDS is one subsystems KPLO Deep-Space Ground System (KDGS), which responsible for overall dynamics-related operation. currently successfully implemented meets all requirements derived from critical design phases. The current work...

The ground tracking support is a critical factor for the navigation performance of spacecraft orbiting around Moon. Because limit antennas, only small number facilities can lunar missions. Therefore, case studies various conditions are needed missions on stage preliminary mission analysis. This study analyzes supporting condition effect orbit determination (OD) Korea Pathfinder Lunar Orbiter (KPLO) in orbit. For assumption conditions, daily frequency, cut-off angle low elevation, measurement...

This paper outlines the collaborative efforts between Korea Aerospace Research Institute (KARI) and National Aeronautics Space Administration (NASA) Johnson Center (JSC) for Flight Dynamics (FD) operation of Pathfinder Lunar Orbiter (KPLO). From outset KPLO program, joint KARI FD team NASA JSC Operations Directorate (FOD) have devoted significant time effort towards ensuring mission’s success. begins by introducing aims scope work, followed a detailed description made FOD. includes top-level...

The Korea Pathfinder Lunar Orbiter (KPLO), officially named as Danuri, is the Republic of Korea's first spacecraft to orbit Moon. goal KPLO secure core deep space technology for future exploration in and contribute lunar science by gathering data from one year. This paper presents results KPLO's Orbit Acquisition (LOA) phase detail, with a particular focus on operational Flight Dynamics (FD). During LOA phase, FD team experienced many expected unexpected issues. These issues were mitigated...

Breast cancer is the second leading for Korean women and its incidence rate has been increasing annually. If early diagnosis were implemented with epidemiologic data, could easily assess breast risk using internet. National Cancer Institute in United States released a Web-based Risk Assessment Tool based on Gail model. However, it inapplicable directly to since dependent race. Also, shows low accuracy (58%-59%). In this study, discrimination models are developed only epidemiological...

On Aug. 4, 2022, at 23:08:48 (UTC), the Korea Pathfinder Lunar Orbiter (KPLO), also known as Danuri, was launched using a SpaceX Falcon 9 launch vehicle. Currently, KPLO is successfully conducting its science mission around Moon. The National Aeronautics and Space Administration (NASA)’s Deep Network (DSN) utilized for successful flight operation of KPLO. A great deal joint effort made between Aerospace Research Institute (KARI) NASA DSN team since beginning ground system design success...

Korea Pathfinder Lunar Orbiter (KPLO) is South Korea’s first space exploration mission, developed by the Aerospace Research Institute. It aims to develop technologies for lunar exploration, explore science, and test new technologies. KPLO was launched on August 5, 2022, a Falcon-9 launch vehicle from cape canaveral force station (CCSFS) in United States placed ballistic transfer (BLT) trajectory. A total of four trajectory correction maneuvers were performed during approximately 4.5-month...

Abstract This study investigates the combustion characteristics (lean blowoff (LBO), flashback, and instability) of sustainable aviation fuels (SAFs) using a two-staged combustor arranged in tandem. The consists first (main) burner with an axial swirler second (afterburner) V-gutter bluff-body. main utilises constant flow rate CH 4 /Air as reactants, while afterburner operates on product from burner, additional dilution air, one six liquid test (Jet-A, A-2, C-1, C-5, C-9, JP-8/HRJ)...

In spite of a short history only 30 years in space development, Korea has achieved outstanding development capabilities, and became the 11th member “Space Club” 2013 by launching its own satellites with launch vehicle from local center. With successful operation more than 10 earth-orbiting since 1999, is now rapidly expanding aspirations to outer exploration. Unlike missions, planetary missions are demanding well-rounded technological specifically trajectory design, analysis, navigation....

Korea Pathfinder Lunar Orbiter (KPLO), also known as Danuri, was successfully launched on 4 Aug. from Cape Canaveral Space Force Station using a Space-X Falcon-9 rocket. Flight dynamics (FD) operational readiness one of the critical parts to be checked before flight. To demonstrate FD software’s and enhance operator’s contingency response capabilities, KPLO specialists planned, organized, conducted four simulations two rehearsals launch. For efficiency integrity simulation rehearsal,...

In this study, the uncertainty requirements for orbit, attitude, and burn performance were estimated analyzed execution of 1st lunar orbit insertion (LOI) maneuver Korea Pathfinder Lunar Orbiter (KPLO) mission. During early design phase system, associate analysis is an essential factor as LOI largest that utilizes onboard propulsion system; success capture directly affected by achieved. For analysis, spacecraft assumed to have already approached periselene with a hyperbolic arrival...

This paper presents a spacecraft attitude estimation algorithm using the unscented information filter. The objective of proposed is to make accurately estimate with low computational load. main contribution this study derive filter for nonlinear dynamics and multiple sensor systems. For estimation, decentralized used in study. provides accurate from filtering less time filtering. To verify effectiveness algorithm, numerical simulations are performed system three gyroscopes.

This paper presents an analysis of the trans-lunar trajectory insertion performance Korea Pathfinder Lunar Orbiter (KPLO), first lunar exploration spacecraft Republic Korea. The successful launch conducted on August 4, 2022 (UTC), utilized SpaceX Falcon 9 rocket from Cape Canaveral Space Force Station. plays a crucial role in ensuring overall mission success by directly influencing spacecraft’s onboard fuel consumption. Following separation vehicle (LV), comprehensive was performed KPLO...

달 궤도선은 한국형발사체(KSLV-II)에 실려 지구 저궤도에 투입된 후, 지상 안테나를 이용한 궤도선의 추적데이터 획득 및 궤도결정 과정을 거쳐 적절한 시점에서 TLI(Trans Lunar Injection) 엔진을 점화시켜야 한다. 본 논문은 궤도선을 나로우주센터에서 발사하여 궤도에 진입하기까지 여러 단계로 나누고 발사 방위각 발사창 분석부터 TLI LOI(Lunar Orbit Insertion) 분사 위치에 따른 속도증분(<TEX>${\Delta}V$</TEX>) 그리고 가시성 식 기간 분석까지 수행하여 직접 전이궤적의 전반적인 특성을 분석하였다. 향후 임무 설계 시 관성비행 전이기간에 따라 속도증분이 어떻게 변하는지에 대한 내용을 파악하는데 도움이 되고, 시각 선정과 연료소모를 줄일 수 있는 파라미터 선정에 도움을 줄 것으로 판단된다. The orbiter is expected to be inserted into a ~300km low Earth orbit using...

We examine the influence of lunar gravity model on orbit determination (OD) a orbiter operating in 100 km high, polar orbit. Doppler and sequential range measurements by three Deep Space Network antennas one Korea Antenna were used. For measurement simulation OD analysis, STK11 ODTK6 utilized. GLGM2, LP100K, LP150Q, GRAIL420A, GRAIL660B used for investigation selection effect. results assessed position velocity uncertainties with error covariance an external comparison using simulated true...

본 논문에서는 이동 목표물을 추적하기 위하여, 다수 무인항공기의 측정치를 이용한 목표물의 위치와 속도 추정기법을 제안하였다. 항공기와 목표물 사이의 상대거리와 시선각 정보를 이용하여 위치, 성분을 추정하는 확장필터를 구성하였다. 다수의 항공기 간 정보교환과 계산이 용이하도록 공분산 역행렬 형태의 정보필터를 설계하였다. 개별 확장필터, 부분 분산형 수치 시뮬레이션을 수행하여, 제안된 확장필터의 추정 및 추적 성능을 검증하였다. This paper deals with the tracking problem of a moving target using multiple unmanned aerial vehicles. A decentralized extended information filter is designed to cooperatively estimate position and velocity target. The adopted consider range line-of-sight...