Research On The Integrated Method Of Communication And Relative Positioning Between Aircraft Group

Research on cooperative operation of aircraft has become a hot topic in the field of aviation and aerospace in all countries.Information transmission and location positioning are important basis for the realization of the cooperative work between aircraft.Although there has been a lot of research on the independent communication and relative positioning technology of aircraft at present,the research on its integrated technology of communication and relative positioning is still not mature.The integration of aircraft group communication and relative positioning can not only maximize the use of existing equipment,reduce the airborne burden,but also enhance the ability to resist interference and improve the viability of aircraft in the battlefield.Therefore,it is of great significance to study the integration of inter-vehicle communication and relative positioning for the improvement of collaborative operational efficiency of aircraft group.On the premise of the existence of mature communication links among aircraft group,this paper proposes a method for the integration of communication and relative positioning by using the existing communication links between aircraft and further based on this method solves the problem of relative positioning between aircraft group.The main research work is as follows:?1?A communication and ranging integration scheme based on tamed spread spectrum technology and link sequence technology is given.Firstly,based on the requirements for the orthogonal characteristics of the tamed spread spectrum system,a mW composite sequence with good autocorrelation and cross correlation is constructed.Then,the time difference of arrival estimation method is used to complete the measurement of the distance between aircraft.The simulation results show that the tamed spread spectrum system can achieve dual range ranging,and can achieve the range less than 10m error in the conventional environment,and the BER is less than 10^-6 in a high signal to noise ratio environment,thus verifying the feasibility and effectiveness of the integrated method of communication distance measurement based on the tamed spread spectrum technology and the link sequence technology,and providing a distance measure for realizing relative positioning between aircraft group.?2?A relative location scheme based on ranging information is given for aircraft group.Firstly,in order to ensure the uniqueness of the positioning results and improve the positioning accuracy,the selection strategy of the positioning reference aircraft is given.Then,using the method of communication ranging integration based on the tamed spread spectrum technology and link sequence technology,the relative distance measurement information between the aircraft is obtained,and based on it,the relative location of the sub-aircraft is realized through the relative motion state detection,the solution of the positioning equation and the fusion process of the positioning result.Aiming at the problem that the motion state is difficult to judge in relative motion detection,this paper proposes a mixed model of uniform speed/uniform acceleration.Aiming at the problem of uncertain correlation between local positioning results of various aircraft,a fusion method based on the minimum rule of the matrix traces is proposed.The simulation results show that the relative positioning method in this paper has good stability for the relative positioning problem in common motion situations.