Research On One-dimensional Ballistic Correction Projectile Control Algorithm Based On GPS Three-dimensional Coordinates

As a kind of simple guided munition,one-dimensional trajectory correction projectile is concerned in many countries.As the basis of trajectory correction technology,it provides an alternative way for the stock of uncontrolled ammunition.Research objects,the new 40mm rocket projectile and 100mm shell,are exemplified by this thesis.Combined with GPS technology,control algorithms are proposed and discussed in details.(1)The present development of trajectory correction technologies in aspects of trajectory correction schemes,correction mechanisms and correction algorithms are surveyed and presented.Based on the literature,the control system schemes and correction mechanisms of the research objects are introduced,respectively.(2)Three-dimensional mass point trajectory model is established.To reduce the trajectory correction error caused by launch point positioning error,an accurate algorithm is introduced.Additionally,cooperated with GPS,two different algorithms calculating the correction moment are proposed,namely,algorithm based on the formulas of correction range and correction moment fitted by least square method and algorithm based on Newton interpolation polynomial.Comparative analysis on accuracy,efficiency and universality of these two algorithms are evaluated by semi-physical simulation.Factors mainly influencing the correction accuracy are discussed.Particularly,a developed unscented kalman filter is introduced to preprocess the measured trajectory data received by GPS receivers,thus improves the trajectory calculation accuracy.(3)A graphic user interface is designed by means of MATLAB tools,and the interface implemented by M files visualizes the trajectory sinmlation.(4)At the end of the paper,the availability of the mentioned algorithms is verified by actual tests.