Analysis Of Spectral Radiation Characteristic Of Typical Interfering Source On Space-based Optical Observation

The spectral radiation characteristic of target and typical interfering source is the foundation on space-based optical observation. Clouds, atmospheric limb and starry background is important interfering source because that their spectral radiation characteristic is complex and changing. It is valuable to study the spectral radiation characteristic of target and typical interfering source.We study the spectral radiation characteristic of the target and background in order to efficiently identify the target from background under the condition of space-based detection. Objects in the detector field angle including target, bait, cloud, atmospheric limb and starry background. This paper analyzes the characteristic of these contents, set up theoretical model and calculate spectral radiation intensity in order to determine the radiation information of the target and typical background. The main contents include the following three aspects.1. Model and calculate the spectral radiation characteristic of target and bait. Heat transfer between target and the external heat source are analysised. Calculation process includes that establish the energy model and the thermal balance equation in sunshine region and shadow areas of the Earth, and get the temperature of the target and bait. Then establish reflectance and emission spectral radiation properties model of target and bait. We could calculate the reflectance and emission spectral radiation intensity of target and bait in different directions on the basis of obtained temperature.2. Model and calculate the spectral radiation characteristic of clouds, and calculate the spectral radiation characteristic of atmospheric limb background. The radiation transfer model which includes primary scattering and double scattering in the circumstance that light incidents absorption and scattering medium are established. According to geometric and physical parameters of clouds background, and combined with particle concentration and size distribution, we can obtain spectral radiation properties of clouds particle system. Then reflectance spectral radiation intensity of clouds in different directions are calculated.3. The spectral radiation characteristic of starry background are studied. The model of stellar effective temperature and detection angle parameters are established which are based on the analysis of stellar space environment. According to the apparent magnitude and radiation flow data which are provided by MSX catalog, stellar effective temperature and detection angle parameters are retrieved using the stochastic particle swarm optimization algorithm. The spectral radiation intensity of starry in different observation point is calculated.This dissertation studies the spectral radiation characteristic of the target and typical backgrounds using numerical calculation method in space-based detection. The spectral radiation characteristic of the target, the reflection spectral radiation intensity of clouds, the spectral radiation intensity of atmospheric limb and the spectral radiation intensity of stellar background and calculated. The calculation results are compared between radiation transfer model which includes primary scattering and double scattering in the circumstance that light incidents absorption and scattering medium and the Monte Carlo calculation model. The calculated stellar effective temperature are compared with literature, and show that the results are right.