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SCIENCE CHINA Technological Sciences, Volume 60 , Issue 5 : 658-667(2017) https://doi.org/10.1007/s11431-016-9034-6

An overview of the mission and technical characteristics of Change’4 Lunar Probe

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  • ReceivedDec 27, 2016
  • AcceptedMar 10, 2017
  • PublishedApr 17, 2017

Abstract


References

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  • Figure 1

    Elevation diagram of South-Pole Aitken Basin.

  • Figure 2

    The topography of nearside and farside of the Moon.

  • Figure 3

    Relay communication link profile.

  • Figure 4

    Earth-Moon L2 orbit profile [7].

  • Figure 5

    Flight profile of relay satellite.

  • Figure 6

    Electromagnetic wave flux density of near-Moon space [8].

  • Figure 7

    The map of the Earth-Moon liberation points.

  • Table 1   Relay communication phases

    Phase

    Lander

    Luna rover

    Earth-Moon transfer

    Directly communicates with ground TT&C stations

    Idle

    Moon orbiting

    a) Directly communicates with ground TT&C stations;

    b) Test on relay communication link

    Idle

    Powered descent

    a) Telemetry and Telecommand data transmission with relay satellite;

    b) Return imaging data of landing camera via relay satellite

    Idle

    Working on Lunar surface

    TT&C and scientific exploration data transmission via relay satellite

    TT&C and scientific exploration data transmission via relay satellite

  • Table 2   Three transfer method

    Phase

    Perigee velocity at launch

    Time to reach L2

    Velocity impulse (theoretical) (m/s)

    Direct transfer

    Almost 10.9 km/s

    Short (almost 6–7 d)

    900–1000

    Lunar swing-by

    Short (almost 8–9 d)

    200–300

    Low-energy

    Long (almost 3 months–half a year)

    0–125

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