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基于日地月信息的自主导航系统利用日地和月地夹角信息来确定卫星的轨道和姿态,具有很强的应用背景。它利用在轨的集成敏感器来敏感太阳、月球和地平边缘,从而产生相应的脉冲。利用脉冲的信息就可以确定日、地、月的方位信息,并可以确定日地和月地夹角。本文研究了该类自主导航系统的基于球形地球假设的方位确定算法,导航敏感器基于地球扁率的地平脉冲、太阳脉冲和月球脉冲的产生机制,并评估了地球扁率对方位确定的影响。仿真结果表明,如果脉冲产生机制中不考虑地球扁率,由脉冲计算出的月地夹角、日地夹角的精度能达到(10-10)°。如果脉冲机制中考虑地球扁率,而方位确定中不进行修正,由脉冲计算出的月(日)地夹角与真实的月(日)地夹角的最大误差有(0.12)°。
The autonomous navigation system based on the information of the sun, the moon and the moon makes use of the angle information between the earth and the moon to determine the orbit and attitude of the satellite and has a strong background of application. It uses in-orbit integrated sensors to sense the sun, moon, and horizon and generate corresponding pulses. The use of pulse information can determine the location of the day, the moon and the moon, and can determine the angle between the day and the moon. In this paper, the azimuth determination algorithm based on the spherical earth assumption of this type of autonomous navigation system is studied. The navigation sensor is based on the flattening of the Earth’s flattening pulse, the solar pulse and the lunar pulse generation mechanism and the impact of the earth’s oblateness on the azimuth determination. The simulation results show that the accuracy of angle between day and earth can reach (10-10) ° by calculating the angle between moon and earth calculated by the pulse if the flattening rate of the earth is not considered in the pulse generation mechanism. If the flattening rate of the earth is taken into account in the impulsive mechanism and the correction is not made in the azimuth determination, the maximum error between the angle of the moon (day) and the true angle of the moon (day) calculated by the pulse is (0.12) °.