• Title/Summary/Keyword: tracking mount

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Pointing Accuracy Analysis of Space Object Laser Tracking System at Geochang Observatory (거창 우주물체 레이저 추적 시스템의 추적마운트 지향 정밀도 분석)

  • Sung, Ki-Pyoung;Lim, Hyung-Chul;Park, Jong-Uk;Choi, Man-Soo;Yu, Sung-Yeol;Park, Eun-Seo;Ryou, Jae-Cheol
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.49 no.11
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    • pp.953-960
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    • 2021
  • Korea Astronomy and Space Science Institute has been verifying the multipurpose laser tracking system with three functions of satellite laser tracking, adaptive optics and space debris laser tracking for not only scientific research but also national space missions. The system employs an optical telescope consisting of a 100 cm primary mirror and an altazimuth mount for fast and precise tracking. The precise pointing and tracking capability in a tracking mount is considered as one of important performance metrics in the fields of automatic tracking and precise application research. So it is required to analyze a mount model for investigating pointing error factors and compensating pointing error. In this study, we investigated various factors causing static pointing errors of tracking mount and analyzed the pointing accuracy of the tracking mount at Geochang observatory by estimating mount parameters based on the least square method.

Preliminary Design of Tracking Mount for Movable SLR

  • Park, Cheol-Hoon;Son, Young-Su;Kim, Byung-In
    • Journal of Astronomy and Space Sciences
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    • v.27 no.2
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    • pp.135-144
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    • 2010
  • In this paper, we present the result of preliminary design of tracking mount for ARGO-M which is a movable satellite laser ranging (SLR) system developed by Korea Astronomy and Space Science Institute (KASI). The tracking mount consists of a couple of core parts such as driving motors, encoders and bearings, and the requirements of each parts are determined on the basis of the technical consideration. 2D and 3D models for tracking mount were preliminarily designed using the selected core parts. In order to evaluate the validity of the preliminarily design, the simulator to test the elevation axis was designed and manufactured. The test to check the tracking performance and system accuracy of the simulator was performed, and it was confirmed that the preliminary design meets the operating specifications. Additionally, it was found that the repetitive errors and hysteresis errors need to be improved by the additional control algorithm.

Development and Preliminary Performance Analysis of a fast and high precision Tracking Mount for 1m Satellite Laser Ranging (1m급 인공위성 레이저추적 시스템용 고속·고정밀 추적마운트 개발 및 예비 성능분석)

  • Choi, Man-Soo;Lim, Hyung-Chul;Lee, Sang-Jung
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.44 no.11
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    • pp.1006-1015
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    • 2016
  • This paper presents preliminary design and performance analysis of a fast and high precision Tracking Mount for 1m Satellite Laser Ranging(SLR) which is development by Korea Astronomy and Space science Institute(KASI). SLR is considered to be the most accurate technique currently available for the precise orbit determination of Earth satellites. The SLR technique measures the time of flight between pulses emitted from laser transmitter and pulses returned from satellites with laser retro-reflector array. It provides millimeter level precision of range measurements between SLR stations and satellites. A fast and high precision Tracking Mount for SLR which is proposed in this research should be capable of day and nighttime laser tracking about the satellites with laser reflectors from 200 km to 36,000 km altitude(geosynchronous orbit). In order to meet this requirement, we performed mechanical design and structural analysis for Tracking Mount. Also we designed the motion control system and conducted pre-performance analysis to obtain good performance results for a fast and high precision Tracking Mount.

DESIGN & STRUCTURAL ANALYSIS OF MULTI-OPTICAL MOUNT SYSTEME FOR TRACKING/OBSERVING ARTIFICIAL SPACE OBJECTS (인공우주물체 추적/관측을 위한 다중 광학계 탑재용 가대 설계 및 구조해석)

  • Seol, K.H.;Kim, S.J.;Jang, M.;Min, S.W.;Mun, B.S.
    • Journal of Astronomy and Space Sciences
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    • v.23 no.4
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    • pp.435-444
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    • 2006
  • Since artificial space objects are observable only in a short period of time and the characteristics of their motion is not exactly predictable, it is difficult to obtain both photometric and spectroscopic data by a set of observations. We have, therefore, designed a mount to load multi-optical instruments on the Kyung Hee University (KHU) satellite tracking and observation system for both photometric and spectroscopic observations of artificial space objects. In this paper, we have calculated the deformation of the remodeled mount using structural analyses for the loading of the multi-optical instruments. We have also deduced pointing errors of the mount occurring at tracking and observing artificial space objects. we have derived tracking reliably artificial space objects in our field of view and confirmed structural safety test of mount utilizing equivalent (von-mises) stress distribution.

A Study on the Structural Integrity of Transportable Heavy-duty Tracking-mount (이동형 대하중 추적 마운트의 구조 건전성에 대한 연구)

  • Kim, Byung In;Son, Young Soo;Park, Cheol Hoon;Lee, Sung Hwi;Ham, Sang Yong;Jo, Sang Hyun
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.22 no.5
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    • pp.879-885
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    • 2013
  • Satellites provide a lot of information and essay roles in the areas of defense and space observations. The precise distances to the satellites are measured by emitting and retro-reflecting a laser. For such surveys, satellite laser ranging (SLR) systems have been developed in different forms and for different areas. The structural integrity of the tracking mount is essential for it to be able to track a high-speed satellite precisely, overcoming the various external and internal disturbances and operating conditions. In this study, the analysis of a tracking mount was performed for weight, wind loads, and inertia loads in order to verify its soundness. The results of the comparison between aluminum and steel were analyzed in order to select the optimal material for the fork and main housing part. In addition, the natural frequency and mode shape were predicted. Optimal material selection and structural integrity will also be verified using static analysis.

A analysis on the satellite tracking performance of Az mount on shipboard (선박탑재 Az mount의 위성추적 성능에 대한 분석)

  • 최조천;주양로
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2003.05a
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    • pp.132-137
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    • 2003
  • This performance is motivated to develop a tracking antenna system for receive the satellite broadcasting signal in the coast sailing ship. Therefore, this system is made to small size, light weight and simple operation which is must to low cost system for popularization of small size ship and adaptive possibilities with useful on a ship in the coast using 1 axis Az-mount. The antenna mount structure is a compact size and easy operation to the Az-axis type which is operated by step motor. The antenna unit is a domestic made plate type of patch array and ship's moving detection is using the gyro sensor for ship's moving control. We are designed to algorithm, which walking is abreast for step track and ship's moving compensation. Ship's moving compensation is adapted to the closed loop control method by detection from gyro sensor. This system is consisted of micro processor, ADC, comparative amplifier, step motor driver, mount mechanism and algorithm. We have analysised the tracking performance of prototype on sailing ship board.

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A analysis on the satellite tracking performance of Az mount on shipboard (선박탑재 Az mount의 위성추적 성능에 대한 분석)

  • 최조천
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.7 no.6
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    • pp.1130-1137
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    • 2003
  • This performance is motivated to develop a tracking antenna system for receive the satellite broadcasting signal in the coast sailing ship. Therefore, this system is made to small size, light weight and simple operation which is must to low cost system for popularization of small size ship and adaptive possibilities with useful on a ship in the coast using 1 axis Az-mount. The antenna mount structure is a compact size and easy operation to the Az-axis type which is operated by step motor. The antenna unit is a domestic made plate type of patch array and ship's moving detection is using the gyro sensor for ship's moving control. We are designed to algorithm, which walking is abreast for step track and ship's moving compensation. Ship's moving compensation is adapted to the closed loop control method by detection from gyro sensor. This system is consisted of micro processor, ADC, comparative amplifier, step motor driver, mount mechanism and algorithm. We have analysised the tracking performance of prototype on sailing ship board.

JTCS Software Design and Tracking Performance of NYSC 1m Telescope

  • Kang, Wonseok;Kwon, Sun-gill;Lee, Sang-Gak;Kwak, Teyun;Koo, Donghyun
    • The Bulletin of The Korean Astronomical Society
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    • v.40 no.2
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    • pp.59.3-59.3
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    • 2015
  • National Youth Space Center will complete installation of the NYSC 1m Telescope in this year. Before completion of the telescope, we present the software design of JTCS, and the preliminary result of tracking performance by JTCS and mount of the telescope. JTCS currently uses commercial software of the Sky X, for the real-time coordinates of various objects, such as asteroids, comets, and even satellites. In order to guarantee flexibility in CCD detectors, the MaxIm DL software was adopted and JTCS provides auto-guiding and scheduled image-taking with MaxIm DL. We are now stabilizing the telescope mount and JTCS with long-exposure tests, and gathering the preliminary data of tracking performance.

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Combination Analysis of Optical Tracking System Design Variables for Unknown Space Objects Using Effectiveness Analysis Simulation (효과분석 시뮬레이션을 이용한 미지 우주물체 광학 추적 시스템 설계 변수 조합 분석)

  • Hyun, Chul;Lee, Sangwook;Lee, Hojin;Park, Seung-Wook
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.26 no.9
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    • pp.1312-1319
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    • 2022
  • This paper defines an effectiveness index for optical continuous observation of unknown space objects and presents a range of design variables combinations that can satisfy the effectiveness index from a telescope/mount control system perspective using integrated simulation. The overall system-level simulation was implemented and the tracking performance was analyzed by considering design variables such as target position prediction and frame rate, image processing time and measurement error, target trajectory characteristics, and maneuver performance of mount gimbal. As a result of the analysis, it was confirmed that the continuous tracking performance of the optical observation system is dependent on the combination of frame rate and mount maneuver performance. In a situation where an optical observation system is designed or a similar system is implemented using COTS, an appropriate combination of parameters between design variables can be found through effectiveness analysis simulation as in this study.

A study on the tracking antenna system for DBS receive on a ship (선박용 DBS수신 추적안테나 시스템의 구현)

  • 최조천;양규식;최병하
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.22 no.10
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    • pp.2236-2245
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    • 1997
  • The DBS system is being highlighted as actual area for the information societics. Specially, the DBS have been proposed very useful system to access the broading service in more widely sea. But the antenna tracking system for maritime DBS receiving is requried complicated control system because of the those complex motion represented pitching, rolling and yowing etc. Our resesrch target is a development of tracking system to the KOREASEA(MUGUNGWHA-1,2) for the applicated small size shipping. So our development focus was concentrated the two development direction. The first focus was represented low-cost system for popularization of small-size shipping around sea of the Korea peninsula. The second focus was an adaptive possibilities with domestic eqdupiment which was developed satellite receiving for KOREASAT. The anntenna mount is designed a compact size and easy operation use to the Az/El 2-axis type which is operated by step motor. And this mount type is very useful on a ship in the near sea of Korea peninsula. Basic tracking method is used th step-tracking algorithm, and the ship's moving compensation is adapted to the closed loop control method by ship's moving detection of gyro sensor. Control part is consists of converter, countertime, VCO, micro-computer and it's software. Testing the operation by the ship's moving simulator, and algorithm is designed tracking and moving compensation by receiving state.

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