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The LRA on Compass M1 and Laser Ranging Experiment
Yang Fumin(1), Chen Wanzhen(1), Zhang Zhongping(1),Wang Yuanming(1), Zhang Haifeng(1)
Zhao You(2), Fan Cunbo(2) and Han Xingwei(2)
(1) Shanghai Observatory, Chinese Academy of Sciences, Shanghai, China
(2) Changchun Observatory, Chinese Academy of Sciences, Changchun, China
The LRA on Compass M1The LRA on Compass M1
2.5 kgWeight
fused silicaMaterial
360cm2Reflective area
42Number
33mmDiameter of corner cube
31.6××××28 cmSize
The corner cubes are uncoated both front and back surfaces
Upgrading of Changchun SLR
•• New laser: (a loan from NCRIEO)New laser: (a loan from NCRIEO)
ActiveActive--active mode locked active mode locked Nd:YAGNd:YAG laserlaser
100100--150mJ in 532nm, 250ps, 20Hz150mJ in 532nm, 250ps, 20Hz
•• New New CoudeCoude mirrorsmirrors
•• 210mm diameter transmitting telescope210mm diameter transmitting telescope
10 10 aresecaresec laser beam divergencylaser beam divergency
•• 2 sets of event timer (Riga Univ.)2 sets of event timer (Riga Univ.)
ActiveActive--active modeactive mode--locked locked Nd:YAGNd:YAG laserlaser100100--150mJ (532nm), 150mJ (532nm), 250ps, 20Hz250ps, 20Hz
Changchun SLR Telescope
Changchun SLR Control Room
Conclusions
• The performance of the Compass M1
LRA is excellent
• The uncoated corner cubes are fine for
high orbit satellites
MEO(070429)
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10
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1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 52 55
时间( 1mi n)
点数
MEO试试试试验验验验星星星星的的的的实实实实测测测测回回回回波波波波统统统统计计计计((((全全全全弧弧弧弧段段段段))))
MEO(070429)高度(45.7-43.7度)
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5
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20
25
1 2 3 4 5
时间(min)
点数
MEO试试试试验验验验星星星星的的的的实实实实测测测测回回回回波波波波统统统统计计计计((((12个个个个回回回回波波波波/分分分分钟钟钟钟 ))))
Galileo/GIOVE-A(070429)高度(45.7-43.7度)
0
5
10
15
1 2 3 4 5 6
时间(min)
点数
Galileo/GIOVE-A 试试试试验验验验星星星星的的的的实实实实测测测测回回回回波波波波统统统统计计计计((((4个个个个回回回回波波波波/分分分分钟钟钟钟 ))))
AbstractAbstract
The Chinese experimental navigation satelliteThe Chinese experimental navigation satellite《《《《《《《《CompassM1CompassM1》》》》》》》》with with
an orbital altitude of 21500km was launched on April 13, 2007. an orbital altitude of 21500km was launched on April 13, 2007.
The performance of the LRA on Compass M1 and the laser ranging The performance of the LRA on Compass M1 and the laser ranging
experiment at the Changchun SLR station are introduced. experiment at the Changchun SLR station are introduced.
It is shown in the experiment that the returned signal strength It is shown in the experiment that the returned signal strength from from
the LRA is much stronger than the signals from GPSthe LRA is much stronger than the signals from GPS--35/36 and 35/36 and
GIOVEGIOVE--A.A.