Present Status of the Payload Development for Chang e-1

Transcription

1 September.19,2005 Huixian Sun 1, Ji Wu 1, Baochang Zhao 2, Rong Shu 3, Nan Zhang 4, Huanyu Wang 5, Qingying Ren 1, Xiaohui Zhang1, Xiaomin Chen1 1 Center for Space Science and Applied Research, 2 Xi'an Institute of Optics and Precision Mechanics, 3 Shanghai Institute of Technical Physics, 4 Purple Mountain Observatory, 5 Institute of High Energy Physics, Tel: , shxian@cssar.ac.cn Chinese Academy of Sciences Present Status of the Payload Development for Chang e-1 International Lunar Conference September 18-23, 2005 Toronto, Canada

2 Contents Introduction The main tasks have been done this year Software development The payloads calibration and function verification test 2

3 China plans to implement its first unmanned lunar exploration in The project is to launch a moon orbiter 200km above the surface Now the project of Chang e-1 is going well and all of the tasks are on schedule INTRODUCTION 3

4 INTRODUCTION Mission objectives are: To obtain the lunar surface stereo image To Analyze the useful elements of the moon To survey the thickness of lunar soil To exploring the lunar environment 4

5 The payloads are: INTRODUCTION Stereo camera and spectrometer imager Laser altimeter Gamma ray and X ray spectrometer Microwave radiometer Space environment monitor system 5

6 The main tasks have been done this year Spacecraft Electrical model Assembly, Integration and test Thermal and structural model Assembly, Integration and test Electromagnetic Compatibility Test 6

7 The main tasks have been done this year Payloads EM environmental qualification test including strength test, sinusoidal and random vibration test, thermal vacuum test, temperature circling test EMC test Software development including requirement, design and test review Calibration and function verification test 7

8 EM environmental qualification test All the payloads passed the environmental qualification test without difficulties We did faced the new challenge for the fibercarbon antenna used for microwave radiometer By the calculation the antenna have to withstand the temperature range is that we never done before We have to find the new technics, finally the problem was solved 8

9 Calibrating antenna Receiving antenna 9

10 thermal vacuum test of the antenna antenna 10

11 Software development There are 10 embedded software in the payloads of Chang e-1 The following works have been done Software requirements review Design review Software unit test Software configuration item test Third party verification test System function and performance test Test review Software acceptance review 11

12 The payloads calibration and function verification test Ground calibration and function verification test are very important for payloads The calibration and function verification test outline as well as detailed operating procedures have been reviewed The calibration and function verification test has been done for the EM of the payload, the purpose of the action is proof-test of the outline and operating procedures Some examples of the calibration and verification test activities are given in the following presentation 12

13 Stereo camera and spectrometer imager 13

14 Calibration of spectrometer imager Relative calibration Absolute calibration Function verification test 14

15 Stereo camera Main Specifications Resolution 120m Swath 60km FOV 34.2, spectrometer imager Resolution 200m Band λ=0.48~0.96 µm Swath 25.6km 15

16 Calibration of stereo camera Relative calibration Absolute calibration Function verification test 16

17 Function verification test for stereo camera 90mm/s Equivalents to 1.43km/s at 200 km 12.6m 17

18 Stereo image Moving Object Forward view Nadir view Backward view 18

19 Fused stereogram 19

20 Function verification test for spectrometer 20m 20

21 Spectrum of one pixel Interfered curve of one pixel Reconstructed spectrum of the pixel 21

22 Reconstructed image Object Reconstructed image 22

23 Different band of the visible light and the spectrometer λ= 0.4~0.8μm λ=0.48~0.96 µm 23

24 Laser altimeter 24

25 Main Specifications Operation distance: 200Km Spot on the lunar surface: φ120 m Wave length: 1064 nm Pulse width: <10ns Pulse energy: 140 mj 25

26 Calibration results Extinction ratio: 62.1dB Equivalent measurable max. altimeter above the moon: 280km Pulse energy:149mj Resolution: 1m 26

27 Reflect plane Calibration 27

28 Gamma ray spectrometer 28

29 Gamma ray spectrometer Gamma spectrometer Energy range: 300kev-9Mev Resolution : γ ray 137 Cs 9%@662 kev Channel: 512 Calibration Background Gamma-ray Spectrum 137 Cs (cesium), 60 Co(cobalt), other isotope 29

30 Background Gamma-ray Spectrum 30

31 137 Resolution 9.3% 31

32 60 Co 1.13Mev Res. 7.8% 1.37Mev Res. 6.7% 32

33 208 Tl (thallium) 2.615MeV Res. 5.0% 33

34 Calibrated fitting curve 34

35 X ray spectrometer 35

36 X ray spectrometer X ray spectrometer. Energy range: 0.5Kev and 60Kev Resolution : 600eV@5.95keV 36

37 Calibration Radiation source: 55 Fe (Iron) 241 Am (Americium) X ray generator Target materiel : Mg Al Si 37

38 Energy spectrum of 55 Fe 38

39 Energy spectrum of Al 39

40 Energy spectrum of Cu 40

41 Energy spectrum of basalt 41

42 Sun monitor sensor linearity 42

43 summary All works in EM phase have been done on schedule for the payloads of Chang e-1 The calibration and function verification tests are very important for the development of payload The calibration and verification tests have been done in EM phase for the improvement of the method and operating procedure The FM phase is started 43

44 Thank you for your attention 44