X-ray Pulsar Navigation Algorithm Base On GBM

As space technology continues to advance,spacecraft are facing more and more challenges in autonomous navigation,observation,data analysis,scientific research,and deep space exploration.In solving these challenges,the absolute and relative positions of spacecraft are particularly important.Spacecraft that can determine their absolute position autonomously are more visionary than those that must rely on signal transmission to solve their communication problems,because they have greater autonomy and reliability.In this paper,the Fermi Gamma-ray Large Area Space Telescope(FLAST)is used to detect gamma-ray bursts by using the Gamma-ray Burst Monitor(GBM)(hereinafter referred to as the Fermi/GBM)on the Fermi satellite and observations of the Crab pulsar pulsar to conduct a feasibility study of pulsar navigation experiments.For this reason,in this paper,we selected the Crab pulsar observations in the energy band of 8-900 Ke V received by Fermi/GBM from September 11,2021 to September26,2021,and analyzed these data to calculate the absolute navigation accuracy of the Fermi satellite to be about 20 km.Through this experiment,we obtained a set of results on the application of Crab pulsar signals to spacecraft navigation The preliminary results of this experiment are presented,and a new idea is proposed for the future development of spacecraft deep space exploration and autonomous navigation technology of spacecraft in China.In addition,a new multi-satellite joint navigation method is proposed in this paper.The method utilizes the Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor(GECAM)and Fermi/GBM for the joint observation of repeated gamma-ray bursts,such as SGR J1935+2154.The absolute and relative navigation accuracies between the Fermi/GBM satellite and the GECAM satellite are calculated by the inverse time delay positioning method(also called the inverse triangulation technique method).The navigation method based on repeated bursts is more economic and convenient than pulsar navigation,and the method in fact does not need to know a prior the location of a bursting source;it just needs to include the location(i.e.Declination and Right Ascension)as additional parameters in the fitting.Therefore,this new navigation method has a good potential and can be combined with pulsar navigation for deep space exploration in the future.