Satellite orbit radiant heat flux calculation using method of coordinate transformation

The calculation of radiant heat flux on satellite orbit is of great significant for satellite in both the thermal design and control and research of its infrared features. In this paper, firstly combined with the six elements of satellite orbit parameters which describing satellite motion model, and with the use of the coordinate transformation method, the position relationship and angle relationship of the satellite's each surface and the sun. The earth were established. Secondly, the satellite surface radiation heat flux calculation model was established. And the major orbit radiation heat flux such as solar radiation, earth-reflection and the earth radiation of satellite with any orbit parameters and at any time can be calculate with the model. Thirdly, taking a hexahedron satellite in an orbit for instance, the radiant heat flux on its different surfaces during the period on the orbit was calculated. Results show that different surface received radiant heat flux are not the same, which mainly depend on the angle relationship of the surface and the sun and the earth.