Research On The Technology Of Geosynchonous Orbit High Dynamic Range Information Acquisition

With the advantage of the rapid response capability for key events, and the near real-time observation of small-scale objectives, geostationary satellite remote sensing is becoming an important direction of development in the field of remote sensing[1]. With the continuous development of geostationary orbit remote sensing payload key technologies toward the high temporal resolution, high spatial resolution and large detection width, high detection sensitivity direction, a higher dynamic range remote sensing satellite imaging systems is more and more demanded.Based on the background referred above, this paper focus on research on high dynamic range information capture technology based on a focal plane staring imaging system and a scanning linear array imaging system, the main contents include the following aspects:1. According to the solar-atmosphere-earth radiation model, the geostationary orbit specific target irradiance of a specific band of the satellite camera entrance pupil is studied, considering different solar albedo, different zenith angles and different atmospheric conditions on the target irradiance.2. According to the problems that a large dynamic range image can not be captured in a single exposure of Geostationary orbit high sensitivity detection, with its high temporal resolution advantage, a multiple parameter exposure method based on focal plane staring detection and a double exposure method based on scanning linear array detection, to achieve a large dynamic range information acquisition. The validation of a 152.6d B dynamic range focal plane array iamging system and a 140 d B dynamic range line array system are achieved respectively.3.For the data processing problems of multi-parameter high dynamic range image acquisition, we propose multi-parameter fusion algorithms based on remote sensing,including fusion method based on large dynamic range image display, and bit depth increasing fusion method based on multiple exposures. achieving data depth can be fused up to 26 bit, dynamic range up to 152.6d B.4.According to the high dynamic range image capture problem of visible channel on geostationary orbit, a large dynamic range visible imaging prototype is designed, achieving a 100% Earthshine to 9.9 mag star range information acquisition, the system dynamic range is up to 129.7d B.