Korea Astronomy and Space Science Institute (KASI) launched the development project of two satellite laser ranging (SLR) systems in early 2008 after the government fund approval of the SLR systems in 2007. One mobile SLR system and one permanent SLR station will be developed with the completion of t...
Korea Astronomy and Space Science Institute (KASI) launched the development project of two satellite laser ranging (SLR) systems in early 2008 after the government fund approval of the SLR systems in 2007. One mobile SLR system and one permanent SLR station will be developed with the completion of the project. The main objectives of these systems will be focused on the Space Geodetic researches. A system requirement review was held in the second half of the same year. Through the following system design review meeting and other design reviews, many unsolved technical and engineering issues would be discussed and resolved. However, the design of the mobile SLR system is a corner stone of whole project. The noticeable characteristics of Korea's first SLR system are 1) use of light weight main mirror, 2) design of compact optical assembly, 3) use of KHz laser pulse, 4) use of commercial laser generator, 5) remote operation capability, 6) automatic tracking, 7) state of art operation system, etc. In this paper, the major user requirement and pre-defined specification are presented and discussed.
Korea Astronomy and Space Science Institute (KASI) launched the development project of two satellite laser ranging (SLR) systems in early 2008 after the government fund approval of the SLR systems in 2007. One mobile SLR system and one permanent SLR station will be developed with the completion of the project. The main objectives of these systems will be focused on the Space Geodetic researches. A system requirement review was held in the second half of the same year. Through the following system design review meeting and other design reviews, many unsolved technical and engineering issues would be discussed and resolved. However, the design of the mobile SLR system is a corner stone of whole project. The noticeable characteristics of Korea's first SLR system are 1) use of light weight main mirror, 2) design of compact optical assembly, 3) use of KHz laser pulse, 4) use of commercial laser generator, 5) remote operation capability, 6) automatic tracking, 7) state of art operation system, etc. In this paper, the major user requirement and pre-defined specification are presented and discussed.
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제안 방법
We chose a two-axis simultaneous operating Alta-Azimuth type mount for tracking and positioning of optical tube assembly. The design of tracking mount sub-system (TMS) is selected to satisfy the requirement of pointing accuracy considering payload, total weight, speed, acceleration, and external disturbance. The main objectives of the design are the assurance of structural rigidity for the stability of mount and reduction of weight.
The design of tracking mount sub-system (TMS) is selected to satisfy the requirement of pointing accuracy considering payload, total weight, speed, acceleration, and external disturbance. The main objectives of the design are the assurance of structural rigidity for the stability of mount and reduction of weight. The design requirements of TMS are presented in Table 4.
대상 데이터
Laser generator is a device to transmit and control laser light. It consists of five components; a seed laser generator creating pulsed laser light with 1,064 nm wave-length, amplifiers, isolators, a Pockels cell, and a non-linear optical crystal. ARGO-M will use laser light with 532 nm wavelength, 10 ps pulse width, and 2 kHz repeat rate.
Opto-electronics controller generates the range gate signal for C-SPAD and laser firing signal on the basis of the standard frequency (1 pps/10 MHz) from the GPS receiver. Opto-electronics controller consists of a timing controller, a range gate generator, and a laser firing shift controller. The timing controller defines reference time from the GPS signal.
Due to the design restriction for the compact form factor, we decided to have 40 centimeter diameter receiving telescope. The 10 centimeter Galileo type refractor was chosen for the laser transmitting telescope. With predecided specifications of the mobile SLR system, major user requirement and some of specification were defined.
이론/모형
Receiving telescope receives the return laser signal from a target satellite and relays it to the back-end optical bench. The design of receiving telescope is based on Ritchey-Chretien type reflecting telescope. A detachable window is added to prevent dust inside the optical tube assembly.
후속연구
However, SLR has strong tie to the Fundamental and Absolute Astronomy. The completion of this project will make Korea contribute the international SLR and Space Geodesy communities. KASI can step forward to the research fields of advanced Space Geodesy in Korea.
참고문헌 (22)
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Choi J, Kim B-Y, Yim H-S, Chang H-Y, Yoon J-N, et al., Orbit determination using angle-only data for MEO & GEO satellite and obsolete, JASS, 26, 111-126 (2009). doi: 10.5140/JASS.2009.26.1.111
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Kim BS, Park BW, Lim HC, Hwang KH, Lee TK, A planning study on the R&D project of satellite laser ranging system (Korea Institute of S&T Evaluation and Planning, Seoul, 2007).
Kim DW, Kim CH, Shin JS, Park PH, Choi KH, et al., A study on the computer programs for the tracking and position predictions of artificial satellite, Science and Technology Agency, Report N8613 (1987).
Kim KD, Jang JG, Jang BH, Na JK, System design document for ARGO-M optics sub-system, Korea Astronomy and Space Science Institute, ARGO-SDD-620-F00 (2009).
Kim YG, System design document for ARGO-M laser sub-system, Korea Astronomy and Space Science Institute, ARGO-SDD-640-F00 (2009a).
Kim YG, ARGO-M system design review meeting, laser sub-system (2009b).
Kirshner G, Present status of the Graz kHz SLR system, in kHz SLR Meeting, Graz, Austria, 27-29 Oct 2004.
Na JK, Jang JG, Kim KD, Jang BH, ARGO-M system design review meeting, optics sub-system (2009).
Park CH, Son YS, Kim BI, Preliminary design of tracking mount for movable SLR, JASS, 27, 135-144 (2010). doi: 10.5140/JASS.2010.27.2.135
Park PH, Park JU, Lim HC, Cho SK, Jang JG, et al., Development of the fundamental technology on satellite tracking and space surveillance system using SLR, Ministry of Science and Technology (MOST), MOST Technical Report, M104170 00004-04O1700-00410 (2005).
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