Autonomous celestial navigation method for deep space probe on near-earth parking orbit

Abstract

The invention relates to an autonomous celestial navigation method for a deep space probe on a near-earth parking orbit. The method comprises the following steps: performing continuous height (20-50km) modeling and fitting in the stratosphere on density scale height H according to data given by United States atmosphere standard in 1976, establishing a stellar atmospheric refraction model, establishing a novel measurement model by taking height difference at adjacent moments as observed quantity, and estimating the navigation parameters by adopting a method for correspondingly improving extended Kalman filter parameters. The autonomous celestial navigation method is applied to navigational positioning of the deep space probe on the near-earth parking orbit, errors caused by the environment can be eliminated on the basis that extra observed quantity is not increased, and the navigation accuracy is guaranteed.

Description

technical field [0001] The invention relates to the technical field of celestial navigation, in particular to an autonomous celestial navigation method for a deep-space probe on a near-earth berthing orbit, which can be used to accurately determine the navigation parameters of the deep-space probe on a near-earth berthing orbit. Background technique [0002] Deep space is an abbreviation for deep space relative to near-Earth space. At present, there is no unified definition in the world. According to the "Encyclopedia of China Aerospace Volume", deep space refers to the space that is equal to or greater than the average distance from the earth to the moon (about 380,000 kilometers). Probing activities. One of the key technologies that determines the success or failure of deep space exploration is deep space navigation, which is used to determine the instantaneous position and speed of the probe during deep space flight. Deep space navigation mainly includes non-autonomous ...

AI Technical Summary

Problems solved by technology

The indirect sensitive horizon navigation method using the refraction characteristics of atmospheric stars has high accuracy, but requires an accurate atmospheric refraction model, and due to the complexity of the deep space environment, the commonly used measurement model based on apparent height as the observation cannot accurately characterize The actual environment where the deep space probe is located, that is, unknown errors may occur during the observation process but cannot or cannot be modeled, and there may even be situations where the actual noise has covered the observations and the observations are still used for navigation. These will affect the system. The final navigation accuracy has an impact

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