The Orbit Determination Methods Of X-ray Pulsar Single Satellite

The navigation research of pulsar is still in the pre- feasibility study stage, also face a series of technical problems to be solved, the United States by virtue of technology in the field of satellite navigation, and achieved initial breakthrough is to be expected in the project development. Therefore, X-ray pulsar navigation system will achieve a new breakthrough in areas of measurement and spacecraft position and time. Meanwhile, the pulsar navigation and positioning system can achieve navigation tasks of high Earth orbit, and interplanetary flight. Radio pulsars will play a huge advantage in the near-Earth orbit navigation positioning. It is believed that with the research and development of X-ray pulsar positioning technology, autonomous navigation capabilities of X-ray pulsar positioning system promising a very important development in the information war.Pulsar constitute a high-precision inertial reference system, and they have a precise location coordinates. Pulsar is an excellent natural spacecraft navigation beacons, pulsars also has good spatial reference benchmarks and time reference. X-ray pulsar has a relatively high energy of radiation, as well as to facilitate the acceptance of the detector and the processing of pulse signal, to improve the accuracy of the pulsar observation system, to be easy to implement miniaturized detection equipment. Previous spacecraft orbit determination requires at least three pulsars, and relies on optical observations of ground-based observatories. In this paper, the orbit determination algorithm of a single X-ray pulsar star is used, using only X-ray pulsar observations, no ground-based observatories, to achieve autonomous spacecraft navigation. The algorithm combines the two-body motion equations and least squares iterative method to achieve the initial orbit of the spacecraft, using the FFT method to process simulation signal of X-ray pulsar.This paper presents a method for on matlab platform simulation to verify the feasibility of the orbit determination algorithm of X-ray pulsar and the phase comparison method of FFT, the results show that the orbit determination algorithm of X-ray pulsar has a very good accuracy. The algorithm can be widely used in the orbit determination of deep space, to avoid errors of ground observations in deep space, to improve the precision of orbit determination.