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Shanghai Station
Beijing Station
Mobile Station
Fig. 3.21 Stations of the Chinese SLR network: Shanghai, Beijing, and a mobile station
SLR experiments for the first time in China. The first generation system adopted the
Q-switched ruby laser, with a single ranging accuracy of 1-2 m. In 1980, for the
first time Shanghai Observatory employed devices using Q-switched Nd:YAG
lasers in the satellite ranging. The use of a constant fraction discriminator and a
high precision event timer improved the ranging accuracy to 20-30 cm. In 1983, the
second generation SLR system, which was organized by the Chinese Academy of
Sciences (CAS) and completed under the coordination of several research institu-
tions, was put into use in Shanghai Observatory. It detected the LAGEOS satellite
8,000 km away with a single-shot ranging accuracy of 15 cm. It also participated in
the international Earth rotation connection survey of MERIT.
Changchun station of the CAS SLR network officially participated in interna-
tional cooperation in 1992. In August 1997, the SLR system was improved consid-
erably so that its single-shot ranging accuracy was improved from 5 cm to 1-2 cm
and the quantity and quality of observations were both improved significantly. Its
number of observations reached about 2,600 laps per year, ranking within the
world's top ten. Beijing SLR station belongs to the State Bureau of Surveying
and Mapping of China (SBSM) and has taken part in international cooperation since
1994. It has been upgraded since 1999 and now its ranging accuracy reaches 1-2 cm
with observation data of 1,500 laps per year. Wuhan SLR station, jointly
established by the CAS Institute of Geodesy and Geophysics (IGG) and Institute
of Earthquake Science, China Earthquake Administration (CEA), began to join in
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