Research Of Data Acquisition Network Based On Embedded Fingerprinting Localization System

With the development of the modernization process,positioning technology has penetrated into many areas of people's lives.For its low cost,wide range of positioning and other advantages,fingerprint positioning technology has become one of the main methods of indoor positioning technology research.The existing fingerprint positioning system mainly locates on the receiving end.But the study of the signal source location is quite few.In this paper,the location fingerprint positioning technology is introduced to the location of indoor signal source.And this paper designs a data acquisition network based on embedded fingerprinting localization system.The system consists of an embedded server and a number of embedded acquisition nodes.It is used to locate the indoor signal source.Then,the data filtering algorithm and the fingerprinting localization database filter are studied and improved.Finally,those methods are implemented in the system.The main research work of this paper is as follows:1)The hardware and software for the data acquisition device based on embedded system are designed.The filtering algorithm of gross error data and filtering algorithm in data processing is studied.This paper proposes an improved windowed Pauta error processing algorithm,static preprocessing algorithm and dynamic preprocessing algorithm for data processing of the data acquisition node.And those algorithms are applied in the data acquisition node.The data acquisition,data processing and data transfer function of the system are verified by experiments.The experiments show that the proposed data processing algorithm can reduce the positioning error and improve the positioning accuracy.2)The hardware and software for the server based on the embedded system are designed.The filtering algorithm of position fingerprint database is studied.The fingerprinting localization database filter is applied to the fingerprinting localization technology.Aiming at the filtering of position fingerprint database,it is proposed that the average European similarity is used to find the noise points in the establishment of the fingerprint database,and then the simplified non-local mean filter is used to correct the data.The validity of the method is proved by the experimental data.At the same time,the functions of data transmission,data processing and human-computer interaction interface of the server are designed and verified.The experimental results show that the positioning effect of the filter is better than that of the non filter fingerprint database,and the average accuracy is improved.3)The data acquisition network based on the embedded fingerprinting localization system is realized.In this paper,the server and the data acquisition node communication protocol are designed.The data processing algorithm and the server side fingerprint location database filter algorithm are applied to the system.The cross compiler and software porting are used to achieve the positioning function of the embedded platform.