The optical navigation errors of Mars probe in the capture stage depend closely on which targets are selected to be observed in the Mars system. As for this problem, an integrated navigation scheme is proposed wherein the optical observation is aided by one-way Doppler measurements. The errors are then analyzed respectively for the optical observation and one-way Doppler measurements. The real-time calculating scheme which exploits the extended Kalman filter (EKF) framework is designed for the integrated navigation. The simulation tests demonstrate that the errors of optical navigation, which select the Mars moon as the observation target, are relatively smaller than those in the Mars-orientation optical navigation case. On one hand, the integrated navigation errors do not depend on the selecting pattern of optical observation targets. On the other hand, the integrated navigation errors are significantly reduced as compared with those in the optical-alone autonomous navigation mode.

中文翻译：

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捕获阶段单向多普勒测量辅助火星探测器自主光学导航

火星探测器在捕获阶段的光学导航误差与在火星系统中选择观察哪些目标密切相关。针对这个问题，提出了一种综合导航方案，其中通过单向多普勒测量辅助光学观测。然后分别为光学观察和单向多普勒测量分析误差。利用扩展卡尔曼滤波器（EKF）框架的实时计算方案是为组合导航设计的。仿真试验表明，选择火星月球作为观测目标的光导航误差相对于火星定向光导航情况下的误差小。一方面，组合导航误差不依赖于光学观测目标的选择模式。