| With the rapid development of wireless sensor networks and mobile communication technology,our society has gradually become an information society,location based service is concerned,people’s demand for indoor positioning accuracy is higher and higher.Especially in the military action and fire emergency rescue,more need to quickly get accurate location information,So as to effectively protect the state and the people’s lives and property.WiFi technology has the advantages of no wiring,fast transmission and small power transmission,However,due to the complexity of the indoor environment,So that the positioning system positioning quality is different.Therefore,in order to solve the problem of positioning accuracy of indoor location fingerprint positioning method,the AP selection is optimized,and a prototype system is designed based on the optimized AP selection method.In this paper,based on the WiFi technology location fingerprint positioning method,to choose an efficient filtering method in the static and dynamic phase as the RSS method.In the AP selection stage,the advantages and disadvantages of the existing methods are analyzed,and the High Stability AP selection method is proposed to improve the positioning accuracy from the two aspects of the amplitude of the AP signal and the detected frequency.In order to ensure the scientific nature of the experiment,before the experiment on the interference factors that may arise in the process of making a detailed analysis of the data,the High Stability AP selection method and the traditional method of positioning accuracy,simulation comparison between the AP number and the positioning error relation and the running time of the algorithm.In this paper,the High Stability AP selection method is used to design a prototype system based on WiFi.First of all,the function and structure of thesystem are introduced in detail,and uses the modularized design idea to carry on the system development.Then the system sub-module is designed in detail.Finally,the performance of the prototype system was tested and analyzed.Test results show that: The maximum positioning error of the system is 6 meters,the location error is within 84% of the probability of 4m,when the total use is 1.197 s,the length of the offline phase is 0.263 s,which indicates that the High Stability AP selection positioning accuracy is good,suitable for offline phase.In this paper,the AP selection method and the design of the prototype system has reached the expected requirements and a good market prospects. |
