X-ray pulsar navigation positioning method and system based on nonlinear prediction strong tracking traceless Kalman filtering

Abstract

The invention discloses an X-ray pulsar navigation positioning method and system based on nonlinear prediction strong tracking traceless Kalman filtering. The navigation positioning method comprises the following steps of taking a spacecraft position vector and a velocity vector as a navigation state variable, establishing a navigation system state model and obtaining a spacecraft state predictionvalue; determining a pulsar signal observation value and establishing a navigation system observation model; using a non-linear prediction strong tracking traceless Kalman filtering method to processa pulsar signal observation value and a spacecraft state prediction value, in the spacecraft state prediction stage, acquiring a minimum navigation system state model error according to a constraintfunction, and correcting a navigation system state model error in a quasi real-time mode; and in a spacecraft state updating stage, introducing a fading factor to suppress a noise interference, predicting and updating the state of a spacecraft. A spacecraft state model error is estimated and corrected, and simultaneously, the problems of filter divergence and the low precision of X-ray pulsar navigation caused by the noise interference are solved.

Description

technical field [0001] The invention belongs to the technical field of spacecraft autonomous navigation and control, and relates to an X-ray pulsar navigation and positioning method and system based on nonlinear predictive strong tracking unscented Kalman filter (NPSTUKF). Background technique [0002] X-ray pulsar navigation (XPNAV) is a new type of navigation, which can provide navigation information such as position, velocity, attitude and time for spacecraft flying near the earth and deep space. In 1970, Reichley and other scholars proposed for the first time the idea of ​​using pulsars as space clock references by studying the high-stable rotation characteristics of pulsars. In 1974, Downs first proposed the idea of ​​autonomous orbit determination of interstellar spacecraft based on radio pulsars. In 1981, American researchers Butman and Chester conceived for the first time the use of pulsar signals in the X-ray band to navigate spacecraft in Earth orbit. After more ...

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Problems solved by technology

[0004] In order to solve the above problems, the present invention aims at the problem that the state model of the spacecraft in X-ray pulsar navigation is difficult to be accurately modeled by analytical method and the X-ray pulsar signal is seriously disturbed by noise, and provides a strong tracking unscent

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