Spacecraft navigation system for equivalent device of X pulsar detector

Abstract

The invention discloses a scheme of a spacecraft navigation based on an X pulsar detection equivalent device. The scheme mainly comprises the following processes of simulating X pulsar emitting photon information detected by an X pulsar detector, and resolving a spacecraft position and speed navigation information. The overall simulation process is divided into three parts, namely detector simulating, data processing and navigation resolving. In the first part, the detector simulates the photon arrival time; in the second part, a data processing system performs cycle folding according to the photon arrival time of the X pulsar, calculates a pulse profile, performs time conversion, and performs pulse profile cross-correlation processing with a standard profile stored by a known ephemeris so as to finish the calculation of the pulse arrival time; and in the third part of navigation resolving, a precise spacecraft orbit and time information are resolved finally by taking the pulse arrival time as measurement information and combining an orbit dynamic equation and kalman filtering. By the X pulsar equivalent device, the influence of various parameters and different algorithms such as a resolution ratio, a view field, time conversion precision, a folding algorithm and the like on the autonomous navigation accuracy of the spacecraft can be analyzed, and necessary technical support is provided for the development of an X pulsar-based autonomous navigation system and the research on combined navigation with other systems.

Description

technical field [0001] The invention relates to an X-pulsar equivalent, which is suitable for the precision influence analysis of spacecraft navigation based on X-pulsar and the development of the navigation system. Background technique [0002] With the development of autonomous astronomical navigation technology, the use of natural celestial bodies for navigation has become very popular. X-pulsar is a high-speed rotation neutron star, which can provide rich full-course navigation information such as position, speed, attitude and time, and is an important tool to realize the whole process of spacecraft. Effective means of high-precision autonomous navigation and operation management. The rotation period of pulsars generally ranges from 1.6ms to 1000s, and has good period stability, especially the rotation period change rate of millisecond pulsars reaches 10 -19 ~10 -20 , known as the most stable astronomical clock in nature. X-rays belong to high-energy photons, which co...

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Problems solved by technology

[0007] The problem solved by the technology of the present invention is: to overcome the shortcomings of existing X pulsar equivalents or simulators that only simulate the arrival time of pulses, cannot simulate the arrival time of photons from the source of the detector, and ignore the calculation errors and time unification of intermediate links. , and lack of follow-up navigation processing, provide an X-pulsar detector with high equivalent precision, which can simulate different detection precision through parameter settings, and directly output the position and speed information of the spacecraft

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