X-Ray Pulsar-Based Navigation:Data Processing And Verification-Evaluation Technology

X-ray pulsar-based navigation is a novel astronomical autonomous navigation based on X-ray pulsar observation.At present,the X-ray pulsar-based navigation technology has stepped into the stage of verification in space.In order to meet the demand of X-ray pulsar-based navigation in the engineering application,this dissertation carry out the researches in aspect of methods for X-ray pulsar data processing and the technologies for verification and evaluating.The main contents and results are as follows:1.The data processing methods for in-orbit X-ray pulsar data is studied.Aiming at the large random time delay in the X-ray detector such as SCD,the principle how the random time delay affects pulsar signal profile is described in detail.And random time delay compensation method for the detector is proposed.Aiming at problems of pulsar signal recovery in the dynamic signal processing,using the polynomial to restrain the error of the photon arrival time.Aiming at the low signal-to-noise ratio of the measured data,a target function reestimation method is proposed.Furtherly the data processing accuracy is improved.2.The data processing methods for X-ray pulsar database construction are studied.To obtain high signal-to-noise ratio template in a relatively short time,a pulsar signal template denoising method based on tracking differentiator is proposed.To restrain phase shift,the method of cascading multiple tracking differentiators is adopted.Parameter estimation method for pulsar timing based on space observation is introduced.Analysis methods for the Glitch of Crab pulsar is studied.A Glitch detection method based on detection the peak of pulsar signal is proposed.The method is meaningful to ensure the integrity of the pulsar navigation system.3.A ground supporting system for X-ray pulsar-based navigation test is designed and implemented.A framework based on “object-data-task” management is designed.The framework is with the characteristics of object versatility and tasks flexible to extend.According to the design,the ground supporting system for X-ray pulsar-based navigation test is impemented,including task planning subsystem,data processing subsystem and of pulsar-based navigation verication subsystem.Experiments for the three subsystems are introduced respectively.The resuts verifies the important role of the ground supporting system.4.A hardware-in-the-loop verification and evaluation system is designed and implemented.The scheme design of “Tianshu-II” system is presented.A hardware-in-the-loop simulation method for the pulsar dynamic signal is proposed.System use the “pulse X-ray source controller” to drive the pulse X-ray source to output X-ray.Making use of time synchronization system,the problems of the time unification for X-ray light source and detector and second long synchronization for the two devices are solved.At last,the experiments by “Tianshu-II” system are carried out.The experimental results show that the tracking accuracy is within 6%.