1 Progress of Changchun SLR You ZHAO, Cunbo FAN, Xinwei HAN, Gang ZHAO, Ziang ZHANG, Xue DONG Changchun Observatory/NAOC, CAS, 130117, China.

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Presentation transcript:

1 Progress of Changchun SLR You ZHAO, Cunbo FAN, Xinwei HAN, Gang ZHAO, Ziang ZHANG, Xue DONG Changchun Observatory/NAOC, CAS, , China

Abstract The paper presents the summary and progress of Changchun SLR during the past years. It includes some special satellites observation, such as ETS-8, GIOVE-A, B, and Compass (Beidou) ; the laser time transfer and comparison experiment cooperated with shanghai observatory; aintenance and improvement of the system; the design and development of any frequency fire rate control system; the basic process and application of SLR data.

Upgrading SLR—LTT, BD New laser: (a loan from NCRIEO) Active-active mode locked Nd:YAG laser mJ in 532nm, 250ps, 20Hz New Coude mirrors 210mm diameter transmitting telescope 10 aresec laser beam divergency ET-A320 event timer

Satellite Observation ( ) SatellitesPass BD-MEO77 Giove-A106 ETS-833 GioveB21

KHz Hardware Design The hardware control system is mainly composed of three parts: accurate timing part, range gate control part and laser fire control part. Control system Frame

Laser (Test for KHz) ModelDS Wavelength532 nm Average 10 kHz18 Watts Nominal Pulse 10 kHz40 ns Pulse 10 kHz1.8 mJ Beam ModeTEM 00 - M 2 < 1.1 Polarization100:1 Vertical Beam Diameter1.0 mm Beam Divergence1.6 mrad Pulse-to-Pulse Instability<3% rms Long-Term Instability+/- 3% Pointing Stability< 25 μrad Pulse Repetition Rate500 to 10kHz

Data Analysis  For LAGEOS, the present ability of our precise orbit determination work is in the middle level about 1 to 2 cm;  In the case of our study, the choice of gravity model has slight effect on precision of LAGEOS orbit determination. The influencing order in on sub-mm level.  6 stations comparison

Thanks !