Design and Validation of High Precision Star Tracker on SZ Spacecraft
The design scheme and in-orbit verification results of the high-precision star tracker is presented,which is used in the Shenzhou series of spacecraft in China.In the lens design,a front-placed diaphragm structure is adopted to meet the needs of miniaturization and long-term applications;In the overall structure design,a"frame combination wrap-around"integrated structure is adopted to focus on lightweight and stability;In the circuit design,radiation-resistant reinforced APS image sensors,processors and ASIC are applied to ensurance of high-sensitivity detection and high-reliable information processing throughout the service life;In the algorithm,clustering extraction,fast triangular recognition,curtain compensation and dynamic adjustment of exposure time,etc.are used to achieve key performance indicators such as precision,update rate,dynamic and capture;In addition,the thermal stability of the whole machine is improved to ensure that the performance of the star tracker can be maintained.The star tracker is successfully applied to a series of major space projects,including manned spaceflight,lunar exploration and Beidou-3 which have more than 200 units in orbit operation.
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