Study On Celestial Positioning And Orientation With Three Fields Of Swir Star Sensor For Airborne Platform Applications

Astronomical navigation is a technology of passive measurement navigation,which features high measuring accuracy and a high interference suppression capability and holds an irreplaceably dominant position for military applications.Over the last years,astronomical autonomous navigation on the basis of multi-field star sensors became a new trend for the development of astronomical navigation.But the technology remains at the stage of static model verification.Currently there are complex hands-on application environments,a low efficiency of star map identification algorithms and the evaluation of positioning and orientation errors.Please avoid delving deeply into issues.On the basis of the above questions,it is the intention of this paper to perform application research into the positioning and alignment of the short-wavelength infrared space sensor with three different views.This specific research will include the following aspects:(1)Examination of the simulation technique of the stellar pattern of a shortwavelength infrared three-field stellar sensor on a space-borne platform.A thorough analysis of the star target and underlying properties of the space-borne platform using the star sensing imaging mechanism and the linear system theory provides a simulation model for star sensing imaging connection based on the 2MASS star catalogue,while taking into account fully the effects of the atmospheric refraction and motion blurring on the star point.This simulation yields the Simulated Star Map of the Shortwave Infrared TripleArea Space Base Star Sensor under conditions of hypothetical platform position,direction of platform,and time of flight,etc.,which delivers the subsequent analysis of the Shortwave Infrared Triple-Area Star Sensor Star Map Detection Algorithm and positioning and orientation algorithm.This data input addresses the issue of insufficient data input for the test and assessment of star map recognition algorithms.(2)Research on the star pattern recognition algorithm of a short-wavelength infrared triple-field star sensor on a space-borne platform.To fulfill the requirements of short-wavelength short-wavelength infrared triple-field star map detection for spaceborne platforms,develop a star point extracting algorithm model and get information on the star point position and luminosity properties by simulation.A navigation database of the sky-dividing zone using the properties of the star centers of the simulated star map and navigation star mode information is generated,and the navigation database between fields of view is only 8.40 MB large.In accordance with the star distribution properties of the triple-field star map,a triple-field star map detection algorithm is developed which is based on the sky-division zone.The results of the simulation indicate that the time taken for the triple-field star map detection algorithm using the sky zoning division is 0.0312 s as an average.The detection rate is 96%,which overcomes the problems of low recognition efficiency and low detection performance of the multi-field star map detection algorithm.(3)Investigation of the positioning and alignment algorithm of a short-wavelength infrared triple-field star sensor for a space-borne platform.Proceeding from the demands of high-precision autonomous astronomical navigation for space-borne platforms,the project develops an astronomical autonomous navigation navigation positioning and orientation model derived from the features of inclination sensors,high-precision realtime systems and star sensors.Simulated experiments have been used to investigate the effects of tilt errors,timing errors and star-sensing attitude errors on the precision of the positioning and orientation model.To provide important theoretical guidance for the implementation of an astronomical autonomous navigation demonstration system built around a tilt sensor,a high precision time system and a star sensor.Briefly,through the exploration of the open-minded star wave simulations method for short-wavelength infrared triple-view star sensors,the star map detection algorithm and the orientation and positioning algorithm,it can be applied to astronomical autonomous navigation technologies using star sensors,such as long-range strategic bombers in the vicinity of spacecraft,rockets and other platforms,providing significant technical resources for experimental applications and dependable technical support for the technological application of space-borne platform star sensors.