Spacecraft design overview


1. Satellite platform

The platform uses an extension of the product that had been successfully used for the missions of Beidou, Tan and SVOM satellites, which has been proven high stability and high technical ready maturity. The launching status of the whole satellite is:

  Size: 3000mm×3605mm

  Weight: ≤1400kg

  Power: ≥1000 Watts in average

  Attitude: 3-axis stabilizing, inertial orientation during observation

  Manoeuvring capacity: better than 60 degree in 4 minutes

  Pointing accuracy: better than 0.05 degree

  Stability: better than 0.0005 degree/s

2. Scientific payloads alignment

The satellite aligns the 12 WXT models in a 1/9 spherical surface according to their combined FoV of 3600 square degree, with the FXT in the central position. The FXT optic axis is set to be a critical baseline for all the 12 WXT models' orientation and the star sensors that give pivotal knowledge for the satellite manoeuvring in-orbit. A preliminary layout of the platform is shown in Figure 1


  Figure 1 A preliminary layout of the platform.

3. Satellite operating modes

EP Satellite includes the following operating modes: all-sky survey, burst observation mode, ToO mode, calibration mode, energy acquisition mode and security mode. In order to realize the variety of operating modes above, the satellite has been designed to adapt orientating strategy of solar orientation, attitude maneuvering, and target orientation (inertial orientation).


  Figure 2 Operation mode and pointing strategy