Autonomous fixed star observation method and system for ultra-low orbit satellite

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Autonomous fixed star observation method and system for ultra-low orbit satellite

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TANG TAO / WU HUIYING / WANG GUOHUA / CHANG LIANG / CHEN HONGYU

The invention provides an autonomous fixed star observation method for an ultra-low orbit satellite. The autonomous fixed star observation method comprises the following steps: setting a whole satellite mode word; according to the whole satellite mode word, judging whether an autonomous working condition triggering enabling mark is enabled or not: if so, judging an orbit height to determine a working condition, and starting a fixed star observation task according to the working condition; and if prohibited, setting a working condition through a ground instruction, and starting a fixed star observation task according to the working condition. Meanwhile, the invention provides an autonomous fixed star observation system for the ultra-low orbit satellite. The mechanism meets the requirement of a fixed star observation task under the ultra-low orbit height condition, and the problems of large aerodynamic disturbance torque under the ultra-low orbit condition and large rotating torque caused by maneuvering of a rotary table can be solved; the ultra-low orbit fixed star observation working condition can be automatically switched according to the orbit height, and errors caused by ground orbit forecasting are reduced; meanwhile, the capability of intervening the whole satellite task on the ground is reserved, and whole satellite autonomous observation and ground forced observation can be switched at any time.

本发明提供了一种用于超低轨卫星的自主恒星观测方法，包括：设置整星模式字；根据所述整星模式字，判断自主工况触发使能标志是否为使能：如果使能，则判断轨道高度决定工况，并根据工况，开始恒星观测任务；如果禁止，则通过地面指令设置工况，并根据工况，开始恒星观测任务。同时提供了一种用于超低轨卫星的自主恒星观测系统。本发明适应超低轨道高度条件下恒星观测任务要求，能够克服超低轨条件下大的气动干扰力矩，和转台机动时带来的较大转动力矩的问题；能够根据轨道高度自主切换超低轨恒星观测工况，减少了地面轨道预报带来的误差；同时保留了地面干预整星任务的能力，可随时切换整星自主观测和地面强制观测。