Validation of the precision of atmospheric molecular absorption and thermal radiance calculated by combined atmospheric radiative transfer(CART) code

To validate the precision of atmospheric molecular absorption and thermal radiance calculated by combined atmospheric radiative transfer(CART) code, using the accurate line-by-line atmospheric transfer model(LBLRTM) and moderate resolution atmospheric transmission(MODTRAN4.0), the atmospheric molecular absorption spectral transmittance and infrared spectral radiance calculated by these codes were comparied under clear-sky conditions. Then the horizontal path lengths, observation zenith angles and observation altitudes impacting on average atmospheric transmittance and integrated infrared radiance in several spectral bands were simulated on electro-optical engineering region. The results show that the precision of atmospheric molecular absorption calculated by CART is better than MODTRAN4.0, and calculation precision of the atmospheric thermal radiation is equivalent to MODTRAN4.0.