78212801 2023 317 12:00 2 6.01 APD detector(100um) was used for routine ranging 
78212801 2023 317 12:00 2 5.01 Use 5kHz laser(20ps) for routine ranging 
78212801 2021 265 08:00 2 6.01 Use SHAO-ET instead of A033-ET 
78212801 2021 229 02:00 2 10.01 Update NP generating software.Kurtosis calculations subtract 3 
78212801 2021 203 08:00 2 10.02 Update lageos preprocessing software.Use leading edge method. 
78212801 2021 164 08:00 2 5.01 Use daheng laser 
78212801 2021 100 08:00 2 6.01 CSPAD Detector replaced by SPAD 
78212801 2021 084 10:00 2 9.01 Time and Frequency Standards replaced by the EndRun_Meridian 
78212801 2019 223 08:00 2 5.01 Use 2kHz laser for routine ranging 
78212801 2017 201 02:00 3 5.01 Change Max. Repetition Rate 
78212801 2017 192 02:00 3 8.01 Change start pulse cable and stop pulse cable 
78212801 2017 074 10:00 0 99 Add telescope pointing mode 
78212801 2014 053 00:00 1 8.01 Longer the cable line of return detector for nolinear effect of Event Timer when doing calibration 
78212801 2013 329 00:00 2 6.01.01 Replaced by the new return detector 
78212801 2013 309 10:00 0 99 Modification of the data post-processing software 
78212801 2013 191 08:00 1 4.01 The primary and second mirror replaced by the new one 
78212801 2013 015 02:00 2 6.01.01 Event Timer replaced by the model A033 
78212801 2013 014 12:00 2 6.01.01 Detector replaced by the model 0432 C-SPAD  
78212801 2012 345 09:00 2 99 Discriminator and power replaced by the new one  
78212801 2012 315 04:00 0 4.01 The upgrading the servo control system 
78212801 2012 162 00:00 0 99 Modification of the data post-processing software