The Research Of The Navigation Of Spacecraft Based On The X-Ray Pulsars

The navigation of spacecraft is the point of auto operation and the key technology to reduce the spending of observe and control, improve the reliability of the tasks and ensure the space ability of our nation. Relatively, as celestial sources, the X-Ray's orbital characteristics can not be factitiously destroyed and disturbed. The X-ray detector on the spacecraft can not be blinded by laser or sunshine, and the risk of being destroyed by infectant is low. The characters of X-ray pulsars is obvious on the X wave band, and we can make the detectors very small, and even have enough flux sensitivity and space-time resolution. Therefore, the methods of determine the position, attitude based on X-ray pulsars is steady, credible and high-precision, it is an important aspect in the spacecraft navigation field. At the same time, it can accelerate the development of the correlative subjects in astrophysics. The method of spacecraft navigation based on the X-ray pulsars offers a new mind of navigation.This thesis probes into the principle of position determination, time determination and attitude determination using X-ray pulsars as the info sources. The point is to research the Delta-Correction of Position Estimate. There is a navigation model in the thesis, it emulate and analyze the position precision in different condition of initialization error and measurement error. The thesis gives the navigation accuracy(3σ) which is not exceeding 1000m, when the TOA accuracy is 0.1μsec and the pulsar direction accuracy is 0.1 arcsec, and achieves magnitude of 10m, when the TOA accuracy is 0.01 arcsecμsec and the pulsar direction accuracy is 0.0001 . The thesis analyzes the visibility and GDOP of X-ray pulsars, and discusses the influence of the orbit altitude h, orbital eccentricity e and orbital inclination i towards navigation accuracy, and evaluates the effect of the navigation method applied on the different orbits.This thesis has an important sense for our nation to startup the research of the navigation based on the X-ray pulsars.