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为了实现基于大视场星光折射敏感器的中高轨卫星全天时高精度星光折射导航,针对视场中亮地球引起的强杂散光抑制的技术难题,研究了内掩式星光折射敏感器亮地球杂散光的有效抑制方法。通过构建星光折射敏感器模型、搭建星光折射导航仿真观测环境以及原理计算得出了各级杂散光强度,并确定了相应的抑制方法。仿真结果表明,基于二次成像光学系统的内掩式星光折射敏感器可将杂散光抑制在导航系统的最大可接受杂散光抑制值范围内,即抑制后1.003Re(Re为地球半径)处杂散光亮度小于亮地球平均亮度的1.10×10~(-3)倍。最后,通过月球强背景下恒星探测外场试验验证了杂散光分析及抑制方法的可行性。研究成果为实现基于一个大视场星光折射敏感器的中高轨卫星全天时高精度星光折射导航技术奠定了基础。
In order to realize high-precision celestial refraction navigation of mid-high-altitude orbit satellites based on large-field star refractive sensor, aiming at the technical problem of strong stray light suppression caused by bright earth in the field of view, Stray light effectively inhibit the method. Through constructing starlight refraction sensor model, constructing starlight refraction navigation simulation observation environment and principle calculation, the stray light intensity at all levels is calculated and the corresponding restraining method is determined. The simulation results show that the inner-mask star-refraction sensor based on the secondary imaging optics can restrain the stray light within the range of the maximum acceptable stray light suppression value of the navigation system, that is, 1.003Re (Re is the radius of the earth) Astigmatism brightness is less than 1.10 × 10 ~ (-3) times the average brightness of the earth. Finally, the feasibility of the stray light analysis and suppression method is verified by the field test of stellar sounding in the strong background of the moon. The research results lay a foundation for the realization of high-precision star-refraction navigation technology for mid-high-altitude orbit satellites based on a large field of view star refractive sensor.