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研究考虑地球自转的探月返回跳跃式再入的纵向制导问题.通过对制导动力学进行详细分析,给出了地球自转对制导精度产生影响的原因.在此基础上,针对探月返回跳跃式再入的纵向制导问题,研究了考虑地球自转的反馈线性化跟踪制导律的设计问题.当考虑地球自转时,制导动力学十分复杂,如果直接按照非线性系统反馈线性化控制理论进行制导律设计,所需测量量较多,制导律难以实现.设计了一种简化的反馈线性化跟踪制导律,并分析了设计机理.最后进行了数学仿真,与航天飞机反馈线性化跟踪制导律进行了比较,所设计的制导律在一定不确定下制导精度更高.
This paper studies the longitudinal guidance problem of the jump-reentry of lunar return to Earth considering the rotation of the earth.A detailed analysis of the guidance dynamics gives the reasons why the earth’s rotation affects the guidance accuracy.On this basis, Re-entry of the longitudinal guidance problem, the study of the design of the feedback linearization tracking guidance law considering the rotation of the Earth has been studied. When considering the Earth’s rotation, the guidance dynamics is very complex. If the guidance law design is directly based on the nonlinear linear feedback control theory , The required measurement quantity is more and the guidance law is difficult to achieve.A simplified feedback linearization tracking guidance law is designed and the design mechanism is analyzed.Finally, the mathematical simulation is carried out and compared with the spacecraft linear feedback tracking guidance law , The designed guidance law is more accurate under certain uncertainties.