基于观测几何方法的星间链路天线转动总寿命需求分析

Analysis of Turning Total Life Requirement for Cross-link Steerable Antenna Based on Observation Geometry Method

星间链路机械可移波束天线的转动总寿命需求是进行天线设计的重要依据。文章提出了一种基于观测几何的仿真方法,实现了航天器运动、航天器姿态控制、天线双轴转动相结合的仿真,同时避免了复杂的动力学仿真,并以某Walker-δ星座星间链路机械可移波束天线为例进行了分析,得出了较为准确的天线双轴转动总寿命需求,可用于长寿命高可靠性设计、制定具体的寿命试验方案等。该方法也适用于其他类型星座或其他依靠机械双轴实现指向跟踪的星间链路终端设备。

The turning total life requirement is very important for designing a cross-link steerable antenna. By introducing a simulation method based on observation geometry theory, the evolution of the constellation,the attitude controlling of satellites and the revolution of steerable antennas could be simulated without the complicated dynamical simulation. As an example, the method is applied to a Walker-δ constellation and its cross-link steerable antennas, and then the numerical analysis yields the turning total life requirement for antenna＇s tow-axis. The method might be applied in designing for long life and high reliability,and for programming a life test. The method is universal for other types of constellations or other cross-link terminal devices which depend on steerable two-axis for target tracking.