To provide quantitative reference for related space mission analysis, the remote sensing the earth and atmosphere radiation (EAR) simplified model was proposed. A universal irradiation model that suited for most kinds of spacecraft orbit was introduced, which reduced different orbit scenarios to different angles between the orbit plane and the dawn-dusk plane of the earth. Then the spacecraft position on each orbit, or the phase, was taken into account. The spacecraft remote sensing mode determined the main axis and field of view(FOV).Irradiance propagation process was described with common hypothesis. Then the result display in two ways: distribution map and quantitative graph, which the former shows the relative position where the EAR is in the spacecraft-s 2π hemisphere FOV, then the latter shows the magnitude distribution based on the average albedo. The following magnitude integral according to different off-axis angle could transform the faint target detecting requirement of space mission into the payload’s stray light/radiation blocking requirement. A low earth orbit(LEO) observation example has been demonstrated at visible band.
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