Study On Mini-dynamic Star Simulator Technologies

With the rapid aerospace development, the space navigation equipment becomes important, especially the star sensor with high accuracy and no time-drift. A star simulator is needed to test the star sensor because of the particularity of aerospace experiment. The main research of this dissertation focuses on the star simulator which is the testing equipment for the star sensor.The working principle of the star simulator is analyzed on introduction of the star sensor. The system of the star simulator based on Digital Light Processing is designed and the primary technical parameter is determined.The optical system of the star simulator is divided into two parts: non-imaging optical design and imaging optical design. The white light emitting diode is used as the light source in order to decrease the volume and weight. The illumination program is designed. As a result, the uniformity on the light valve is about 3%. To the imaging optical system of the star simulator, distortion is the most important aberration. The collimating object system with the exit pupil outside is designed on the complex petzval structure. After the optimization, the relative distortion is below 1‰.The display algorithm for star map is designed based on the principle of some celestial sphere coordinate system on astronomy. To improve the efficiency of the algorithm, the rapid seeking thoughts by district-dividing is introduced to reduce theoretical mathematical operation to 1/72. The dynamic display software for star map is completed to display the stars between the stellar magnitude 2 and 6.5. A star map software program on earth is also designed to test and verify the correctness of the algorithm.To the weakness of simulation on the stellar spectrum of the dynamic star simulator at the present stage, a program on color simulation of stars is proposed for the first time. The characteristics between the metering system and the spectral classificiation on astronomy are analyzed and finally the UBVRI metering system is chosen. The color temperature of stars is concluded on the related parameters in a star catalog. The blackbody radiation spectral lines are calculated at the concluded color temperature. The chromaticity coordinates and the tristimulus values of stars are determined according to the principle of chromaticity. Then the color simulation of stars is implemented.The testing experiments are carried out and the experimental results demonstrate the research work.The first new idea of the dissertation is to introduce Digital Light Processing as the core of the display scheme. The second is to propose a program on color simulation of stars.