Abstract
The scattering of complex background (the Sun, the Sea and the Sky background) infrared radiation from a target is studied. By coordinate transformation, summation of the visible facets, integration to wavelength, finally angular distribution formula of integral scattering radiance from a lambertian target is achieved. With the Solar spectrum radiance and the sea & the sky background's spectrum irradiance calculated by Modtran Software, a lambertian cylinder is taken as an example, in wavebands 3∼5µm and 8∼12µm, angular distribution of horizontal and vertical targets' integral scattering radiance is simulated numerically. The results show that: in both wavebands scattering radiance of the sea & the sky background radiation from the target plays an important role, especially in waveband 8∼12µm scattering radiance of the Sun radiation from the target is far less than that of the sea & the sky background radiation, it could be ignorable; and in waveband 8∼12µm scattering radiance of the sea & the sky background radiation than that in waveband 3∼5µm; and scattering radiance from the horizontal target is stronger than that from the vertical target, therefore this attitude is more suitable for target detection in waveband 8∼12µm.
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