Design And Realization Of Self-organization Relative Positioning System Based On Chirp Spread Spectrum

Nowadays,the indoor wireless location technology is restricted by the factors such as cost,positioning accuracy,convenience,and so on,there is no indoor positioning system which is widely used like outdoor satellite navigation system.The existing high precision indoor wireless positioning system relies heavily on infrastructure,it cannot be used in the case of indoor fire rescue and other basic communication facilities damaged.With the extensive application of the self-organizing network like wireless sensor network technology,the localization system based on self-organizing network has a strong advantage of fast self-organization,but because of the positioning mechanism that is widely used in the wireless positioning system is based on the received signal strength,the positioning accuracy is not high,vulnerable to interference,in the complex indoor environment positioning results will fluctuate or even unable to work.In this paperthrough the study of the chirp signal and find the advantage of the communication in the complex indoor environment.this paper decided to change the existing localization mechanism on the basis of the traditional self-organizing network,and introduced the Chirp Spread Spectrum ranging mechanism into the self-organizing network.Design a self-organizing positioning system.It ensures that the traditional self-organizing network can improve the positioning accuracy of the whole positioning system network,and can meet the requirement of the rapid self-organization positioning in the extreme situation.Suitable for applications such as disaster relief and other extreme rapid location of no need to rely on the infrastructure.The main content of this paper:1.Introduce the development situation of the indoor positioning stage,summarizes the characteristics and comparison of conventional wireless positioning technology,Theoretical analysis of the advantages of Chirp Spread Spectrum technology in indoor communication.Combined with engineering practice,the feasibility of its application in indoor environment is analyzed.2.About positioning algorithm,localization algorithm of nonlinear system,the extended kalman filter and particle filter algorithm,the linearization of the positioning process based on the least squares method,and combined with the kalman filter algorithm to optimize the processing results.The algorithm is simulated and the simulation results are analyzed and compared.3.Introduce the positioning system designed in this paper in detail,the hardware design of the system node and the software development of the core chip are also presented.Set up an experimental platform of indoor self organization relative positioning system,and respectively in different environments were verified.The results show that the system has good positioning effect and the ability of ad hoc network.,meets design requirements.