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

yangfm@shao.ac.cn

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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70

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)

0

5

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15

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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)

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5

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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.