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Proceedings Paper

SLR system improvement for GIOVE-A satellite observation
Author(s): You Zhao; Cunbo Fan; Xingwei Han; Dingjiang Yang; Nianjiang Chen; Feng Xue; Lin Geng
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Paper Abstract

Galileo system consists of 27 satellites distributed in three uniformly separated planes. At the end of 2005, one satellite, Galileo In-Orbit Validation Element-A (GIOVE-A), was launched as planned into an MEO with an altitude of 23,260 kilometers. Carrying a payload of rubidium clocks, signal-generation units, and a phase-array antenna of individual L-band elements. GIOVE-A started broadcasting on January 28, 2006, securing the frequencies allocated by the ITU for Galileo. Performance of the on-board atomic clocks, antenna infrastructure, and signal properties is evaluated through precise orbit determination, supported by Satellite Laser Ranging (SLR), an independent high-precision range measurement technique for orbit determination based on a global network of stations that measure the round-trip flight-time of ultra short laser pulses to satellites equipped with laser retro reflector arrays (LRAs). SLR provides instantaneous range measurements of millimeter-level precision which can be compiled to provide accurate orbits and to measure the on-board clock error. Given the importance of SLR data for the characterization of the GIOVE-A clocks, the Changchun SLR station in northeast China was selected among the Chinese stations contributing to the ILRS because it had demonstrated strong MEO satellite tracking; collocation with an existing International GPS Service station; and good weather conditions. This paper introduces the SLR system improvement for tracking GIOVE-A satellite in Changchun station. During the more than two months improvement, the new servo and encoder systems were installed, primary mirror, second mirror and some other mirrors have been cleaned and recoated, and the laser system was adjusted in order to improve the laser efficiency and output energy. The paper gives out the improvement results, and the GIOVE-A satellite observation results.

Paper Details

Date Published: 22 February 2008
PDF: 8 pages
Proc. SPIE 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology, 66221P (22 February 2008); doi: 10.1117/12.790910
Show Author Affiliations
You Zhao, National Astronomical Observatories, Changchun Observatory (China)
Cunbo Fan, National Astronomical Observatories, Changchun Observatory (China)
Xingwei Han, National Astronomical Observatories, Changchun Observatory (China)
Dingjiang Yang, North China Research Institute of Electro-Optics (China)
Nianjiang Chen, North China Research Institute of Electro-Optics (China)
Feng Xue, North China Research Institute of Electro-Optics (China)
Lin Geng, North China Research Institute of Electro-Optics (China)


Published in SPIE Proceedings Vol. 6622:
International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology

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